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BRC-1
BRAKE CONTROL SYSTEM
F BRAKES
CONTENTS
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Revision: November 2004 2005 Frontier
ABSPRECAUTIONS
.......................................................... 4
Precautions for Supplemental Restraint System(SRS) AIR BAG and
SEAT BELT PRE-TEN-SIONER
..................................................................
4Precautions for Brake System ..................................
4Precautions When Using CONSULT-II ..................... 4
CHECK POINTS FOR USING CONSULT-II ......... 4Precautions for
Brake Control .................................. 5Precautions for
CAN System ................................... 5Wiring Diagrams and
Trouble Diagnosis .................. 6
PREPARATION
...........................................................
7Special Service Tool
................................................. 7Commercial
Service Tools ........................................ 7
SYSTEM DESCRIPTION ............................................
8System Components ................................................
8ABS Function
........................................................... 8EBD
Function
...........................................................
8Fail-Safe Function
.................................................... 8
ABS/EBD SYSTEM ...............................................
8Hydraulic Circuit Diagram ........................................
9
CAN COMMUNICATION ..........................................
10System Description
................................................ 10
TROUBLE DIAGNOSIS
.............................................11How to Perform
Trouble Diagnoses for Quick andAccurate Repair
......................................................11
INTRODUCTION
..................................................11WORK FLOW
...................................................... 12CLARIFY
CONCERN .......................................... 13EXAMPLE OF
DIAGNOSIS SHEET ................... 13
ComponentPartsandHarnessConnectorLocation... 14Schematic
..............................................................
15Wiring Diagram ABS ..................................... 16Basic
Inspection .....................................................
20
BRAKE FLUID LEVEL, FLUID LEAK, ANDBRAKE PAD INSPECTION
................................. 20POWER SYSTEM TERMINAL
LOOSENESSAND BATTERY INSPECTION ............................ 20ABS
WARNING LAMP INSPECTION ................. 20
Warning Lamp and Indicator Timing ...................... 21
Control Unit Input/Output Signal Standard .............
21REFERENCE VALUE FROM CONSULT-II ......... 21
CONSULT-II Function (ABS) ..................................
23CONSULT-IIBASICOPERATIONPROCEDURE
... 23SELF-DIAGNOSIS
.............................................. 24DATA MONITOR
................................................. 26ACTIVE TEST
..................................................... 27
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTICITEMS
........................................................................
29
Wheel Sensor System ............................................
29ABS Control Unit Inspection ...................................
30Solenoid Valve System Inspection .........................
31ActuatorMotor, MotorRelay, and Circuit Inspection... 32ABS
Control Unit Power and Ground SystemsInspection
...............................................................
33CAN Communication System Inspection ................ 33
TROUBLE DIAGNOSES FOR SYMPTOMS ............ 34ABS Works
Frequently ........................................... 34Unexpected
Pedal Action ....................................... 35Long
Stopping Distance .......................................... 36ABS
Does Not Work ...............................................
36Pedal Vibration or ABS Operation Noise ................ 36ABS
Warning Lamp Does Not Come On When Igni-tion Switch Is Turned On
........................................ 37ABS Warning Lamp StaysOn
When Ignition SwitchIs Turned On
........................................................... 37
WHEEL SENSORS
................................................... 38Removal and
Installation ........................................ 38
REMOVAL
...........................................................
38INSTALLATION ...................................................
38
SENSOR ROTOR
..................................................... 39Removal and
Installation ........................................ 39
FRONT
................................................................
39REAR (C200)
...................................................... 39REAR
(M226) ......................................................
39
ACTUATOR AND ELECTRIC UNIT (ASSEMBLY)... 40Removal and
Installation ........................................ 40
REMOVAL
...........................................................
40INSTALLATION ...................................................
41
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BRC-2Revision: November 2004 2005 Frontier
ABLS/ABSPRECAUTIONS
......................................................... 42
Precautions for Supplemental Restraint System(SRS) AIR BAG and
SEAT BELT PRE-TEN-SIONER
.................................................................
42Precautions for Brake System ................................
42Precautions When Using CONSULT-II ................... 42
CHECK POINTS FOR USING CONSULT-II ........ 42Precautions for
Brake Control ................................ 43Precautions for
CAN System .................................. 43Wiring Diagrams and
Trouble Diagnosis ................ 44
PREPARATION
......................................................... 45Special
Service Tool ...............................................
45Commercial Service Tools ......................................
45
SYSTEM DESCRIPTION ..........................................
46System Components ..............................................
46ABS Function
.......................................................... 47EBD
Function .........................................................
47ABLS Function
........................................................
47Fail-Safe Function
.................................................. 47
ABS/EBD SYSTEM .............................................
47ABLS SYSTEM ....................................................
47
Hydraulic Circuit Diagram
....................................... 48CAN COMMUNICATION
........................................... 49
System Description
................................................. 49TROUBLE
DIAGNOSIS ............................................ 50
How to Perform Trouble Diagnoses for Quick andAccurate Repair
...................................................... 50
INTRODUCTION .................................................
50WORK FLOW ......................................................
51CLARIFY CONCERN ..........................................
52EXAMPLE OF DIAGNOSIS SHEET .................... 52
ComponentPartsandHarnessConnectorLocation... 53Schematic
...............................................................
54Wiring Diagram ABLS ................................... 55Basic
Inspection .....................................................
59
BRAKE FLUID LEVEL, FLUID LEAK, ANDBRAKE PAD INSPECTION
................................. 59POWER SYSTEM TERMINAL
LOOSENESSAND BATTERY INSPECTION ............................. 59ABS
WARNING LAMP AND SLIP INDICATORLAMP INSPECTION
............................................ 59
Warning Lamp and Indicator Timing .......................
60Control Unit Input/Output Signal Standard .............. 60
REFERENCE VALUE FROM CONSULT-II ......... 60CONSULT-II Function
(ABS) .................................. 63
CONSULT-IIBASICOPERATIONPROCEDURE... 63
SELF-DIAGNOSIS ..............................................
64DATA MONITOR ..................................................
67ACTIVE TEST .....................................................
69
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTICITEMS
........................................................................
71
Wheel Sensor System Inspection ...........................
71Engine System Inspection ......................................
72ABS/ABLS Control Unit Inspection .........................
73Solenoid and Change-Over Valve System Inspec-tion
..........................................................................
73
ActuatorMotor, Motor Relay, and Circuit Inspection...74Stop Lamp
Switch System Inspection .....................75ABS/ABLS Control
Unit Power and Ground Sys-tems Inspection
.......................................................76Brake
Fluid Level Switch System Inspection ..........77Pressure Sensor
System Inspection .......................78CAN Communication System
Inspection ................79
TROUBLE DIAGNOSES FOR SYMPTOMS .............80ABS Works
Frequently ............................................80Unexpected
Pedal Action ........................................81Long
Stopping Distance ..........................................82ABS
Does Not Work
...............................................82Pedal Vibration or
ABS Operation Noise ................82ABS Warning Lamp Does Not
Come On When Igni-tion Switch Is Turned On
.........................................83ABS Warning Lamp Stays
On When Ignition SwitchIs Turned On
...........................................................83
WHEEL SENSORS
...................................................84Removal and
Installation .........................................84
REMOVAL
............................................................84INSTALLATION
....................................................84
SENSOR ROTOR
......................................................85Removal and
Installation .........................................85
FRONT
.................................................................85REAR
(C200)
.......................................................85REAR
(M226)
.......................................................85
ACTUATOR AND ELECTRIC UNIT (ASSEMBLY) ...86Removal and
Installation .........................................86
REMOVAL
............................................................86INSTALLATION
....................................................87
HDC/HSA/VDC/TCS/ABSPRECAUTIONS
.........................................................88
Precautions for Supplemental Restraint System(SRS) AIR BAG and
SEAT BELT PRE-TEN-SIONER
.................................................................88Precautions
for Brake System ................................88Precautions When
Using CONSULT-II ...................88
CHECK POINTS FOR USING CONSULT-II ........88Precautions for
Brake Control .................................89Precautions for
CAN System ..................................90Wiring Diagrams and
Trouble Diagnosis .................90
PREPARATION
.........................................................91Special
Service Tool
................................................91Commercial
Service Tools ......................................91
SYSTEM DESCRIPTION
...........................................92System Components
...............................................92ABS Function
..........................................................93EBD
Function
..........................................................93TCS
Function
..........................................................93VDC
Function
..........................................................93HDC
Function
.........................................................93HSA
Function
..........................................................94Fail-Safe
Function ...................................................94
ABS/EBD SYSTEM
..............................................94HDC/HSA SYSTEM
.............................................94VDC/TCS SYSTEM
.............................................94
Hydraulic Circuit Diagram
.......................................95
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CAN COMMUNICATION ..........................................
96System Description
................................................ 96
TROUBLE DIAGNOSIS ............................................
97How to Perform Trouble Diagnoses for Quick andAccurate Repair
..................................................... 97
INTRODUCTION .................................................
97WORK FLOW ......................................................
98CLARIFY CONCERN ..........................................
99EXAMPLE OF DIAGNOSIS SHEET ................... 99
ComponentPartsandHarnessConnectorLocation. 100Schematic
............................................................
101Wiring Diagram VDC ................................... 102Basic
Inspection ...................................................
109
BRAKE FLUID LEVEL, FLUID LEAK, ANDBRAKE PAD INSPECTION
............................... 109POWER SYSTEM TERMINAL
LOOSENESSAND BATTERY INSPECTION .......................... 109ABS
WARNING LAMP, SLIP INDICATOR LAMP,VDC OFF INDICATOR LAMP AND HDC
INDI-CATOR LAMP INSPECTION ............................ 109
For Fast and Accurate Diagnosis
..........................110PRECAUTIONS FOR DIAGNOSIS
....................110
Warning Lamp and Indicator Timing .....................
111Control Unit Input/Output Signal Standard ............ 111
REFERENCE VALUE FROM CONSULT-II ........ 111CONSULT-II Function
(ABS) .................................115
CONSULT-IIBASICOPERATIONPROCEDURE..115
SELF-DIAGNOSIS
.............................................116DATA MONITOR
................................................119ACTIVE TEST
................................................... 122
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTICITEMS
.....................................................................
125
Wheel Sensor System Inspection ........................
125Engine System Inspection ....................................
126ABS/TCS/VDC Control Unit Inspection ................ 127Steering
Angle Sensor System ............................ 127Yaw
Rate/Side/Decel G Sensor System Inspection. 129Solenoid and VDC
Change-Over Valve SystemInspection
.............................................................
131Actuator Motor, Motor Relay, and Circuit Inspection. 132Stop
Lamp Switch System Inspection .................. 133ABS/TCS/VDC
Control Unit Power and GroundSystems Inspection
.............................................. 134Brake Fluid Level
Switch System Inspection ....... 135Active Booster System
Inspection ........................ 136Pressure Sensor System
Inspection .................... 137Steering Angle Sensor Safe Mode
Inspection ...... 140
CAN Communication System Inspection .............. 140Inspection
For Self-diagnosis Result "ST ANGLESEN SIGNAL"
.......................................................
141Inspection For Self-diagnosis Result "DECEL GSEN SET"
.............................................................
141VDC OFF Indicator Lamp Does Not Illuminate ..... 141Component
Inspection .......................................... 142
VDC OFF SWITCH ...........................................
142HDC SWITCH ...................................................
142
TROUBLE DIAGNOSES FOR SYMPTOMS .......... 143ABS Works
Frequently ......................................... 143Unexpected
Pedal Action ..................................... 144Long Stopping
Distance ........................................ 145ABS Does Not
Work ............................................. 145Pedal
Vibration or ABS Operation Noise .............. 145ABS Warning Lamp
Does Not Come On When Igni-tion Switch Is Turned On
...................................... 146ABS Warning Lamp StaysOn
When Ignition SwitchIs Turned On
.........................................................
146Vehicle Jerks During TCS/VDC Activation ........... 147Stop Lamp
Relay Inspection ................................. 148HDC Switch
Inspection ......................................... 148
ON-VEHICLE SERVICE ..........................................
150Adjustment of Steering Angle Sensor Neutral Posi-tion
........................................................................
150
WITH CONSULT-II ............................................
150WITHOUT CONSULT-II ..................................... 150
Calibration of Yaw Rate/Side/Decel G Sensor ..... 150WHEEL
SENSORS ................................................. 152
Removal and Installation ......................................
152REMOVAL
.........................................................
152INSTALLATION .................................................
152
SENSOR ROTOR ...................................................
153Removal and Installation ......................................
153
FRONT
..............................................................
153REAR (C200) ....................................................
153REAR (M226) ....................................................
153
ACTUATOR AND ELECTRIC UNIT (ASSEMBLY). 154Removal and
Installation ...................................... 154
REMOVAL
.........................................................
154INSTALLATION .................................................
155
STEERING ANGLE SENSOR ................................
156Removal and Installation ......................................
156
G SENSOR
..............................................................
157Removal and Installation ......................................
157
REMOVAL
.........................................................
157INSTALLATION .................................................
157
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BRC-4
[ABS]PRECAUTIONS
Revision: November 2004 2005 Frontier
PRECAUTIONS PFP:00001Precautions for Supplemental Restraint
System (SRS) AIR BAG and SEATBELT PRE-TENSIONER EFS0059JThe
Supplemental Restraint System such as AIR BAG and SEAT BELT
PRE-TENSIONER, used alongwith a front seat belt, helps to reduce
the risk or severity of injury to the driver and front passenger
for certaintypes of collision. Information necessary to service the
system safely is included in the SRS and SB section ofthis Service
Manual.WARNING: To avoid rendering the SRS inoperative, which could
increase the risk of personal injury or death
in the event of a collision which would result in air bag
inflation, all maintenance must be per-formed by an authorized
NISSAN/INFINITI dealer.
Improper maintenance, including incorrect removal and
installation of the SRS, can lead to per-sonal injury caused by
unintentional activation of the system. For removal of Spiral Cable
and AirBag Module, see the SRS section.
Do not use electrical test equipment on any circuit related to
the SRS unless instructed to in thisService Manual. SRS wiring
harnesses can be identified by yellow and/or orange harnesses
orharness connectors.
Precautions for Brake System EFS0059KCAUTION: Refer to MA-11,
"RECOMMENDED FLUIDS AND LUBRICANTS" for recommended brake fluid.
Never reuse drained brake fluid. Be careful not to splash brake
fluid on painted areas; it may cause paint damage. If brake fluid
is
splashed on painted areas, wash it away with water immediately.
To clean or wash all parts of master cylinder and disc brake
caliper, use clean brake fluid. Never use mineral oils such as
gasoline or kerosene. They will ruin rubber parts of the
hydraulic
system. Use flare nut wrench when removing and installing
brake
tube. If a brake fluid leak is found, the part must be
disassembled
without fail. Then it has to be replaced with a new one if
adefect exists.
Turn the ignition switch OFF and remove the connector ofthe ABS
actuator and electric unit (control unit) or the bat-tery terminal
before performing the work.
Always torque brake lines when installing. Burnish the brake
contact surfaces after refinishing or
replacing rotors, after replacing pads, or if a soft pedaloccurs
at very low mileage.Refer to BR-26, "BRAKE BURNISHING PROCEDURE"
(front disc brake) or BR-32, "BRAKE BUR-NISHING PROCEDURE" (rear
disc brake).
WARNING: Clean brake pads and shoes with a waste cloth, then
wipe with a dust collector.Precautions When Using CONSULT-II
EFS0059LWhen connecting CONSULT-II to data link connector, connect
them through CONSULT-II CONVERTER.CAUTION:If CONSULT-II is used
with no connection of CONSULT-II CONVERTER, malfunctions might
bedetected in self-diagnosis depending on control unit which
carries out CAN communication.CHECK POINTS FOR USING CONSULT-II1.
Has CONSULT-II been used without connecting CONSULT-II CONVERTER on
this vehicle?
If YES, GO TO 2. If NO, GO TO 5.
SBR686C
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PRECAUTIONS
BRC-5
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2. Is there any indication other than indications relating to
CAN communication system in the self-diagnosisresults? If YES, GO
TO 3. If NO, GO TO 4.
3. Based on self-diagnosis results unrelated to CAN
communication, carry out the inspection.4. Malfunctions may be
detected in self-diagnosis depending on control units carrying out
CAN communica-
tion. Therefor, erase the self-diagnosis results.5. Diagnose CAN
communication system. Refer to LAN-22, "CAN COMMUNICATION"
.Precautions for Brake Control EFS0059M During ABS operation, the
brake pedal may vibrate lightly and a mechanical noise may be
heard. This is
normal. Just after starting vehicle, the brake pedal may vibrate
or a motor operating noise may be heard from
engine compartment. This is a normal status of operation check.
Stopping distance may be longer than that of vehicles without ABS
when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads. When an error is
indicated by ABS or another warning lamp, collect all necessary
information from cus-
tomer (what symptoms are present under what conditions) and
check for simple causes before startingdiagnosis. Besides
electrical system inspection, check brake booster operation, brake
fluid level, and fluidleaks.
If incorrect tire sizes or types are installed on the vehicle or
brake pads are not Genuine NISSAN parts,stopping distance or
steering stability may deteriorate.
If there is a radio, antenna or related wiring near control
module, ABS function may have a malfunction orerror.
If aftermarket parts (car stereo, CD player, etc.) have been
installed, check for incidents such as harnesspinches, open
circuits or improper wiring.
Precautions for CAN System EFS0059N Do not apply voltage of 7.0V
or higher to terminal to be measured. Maximum open terminal voltage
of tester in use must be less than 7.0V. Before checking harnesses,
turn ignition switch OFF and disconnect battery negative cable.
Area to be repaired must be soldered and wrapped with tape.
Make sure that fraying of twisted wire is within 110 mm (4.33
in).
Do not make a bypass connection to repaired area. (If the
circuitis bypassed, characteristics of twisted wire will be
lost.)
PKIA0306E
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BRC-6
[ABS]PRECAUTIONS
Revision: November 2004 2005 Frontier
Wiring Diagrams and Trouble Diagnosis EFS0059OWhen you read
wiring diagrams, refer to the following: GI-15, "How to Read Wiring
Diagrams". PG-4, "POWER SUPPLY ROUTING CIRCUIT".When you perform
trouble diagnosis, refer to the following: GI-11, "HOW TO FOLLOW
TEST GROUPS IN TROUBLE DIAGNOSES". GI-27, "How to Perform Efficient
Diagnosis for an Electrical Incident".
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PREPARATION
BRC-7
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PREPARATION PFP:00002Special Service Tool EFS0051TThe actual
shapes of Kent-Moore tools may differ from those of special service
tools illustrated here.
Commercial Service Tools EFS0051U
Tool number(Kent-Moore No.)Tool name
Description
(J-45741)ABS active wheel sensor tester
Checking operation of ABS active wheelsensors
205-D002( )Bearing splitter
Removing axle shaft bearingWFIA0101E
ZZA0700D
Tool name Description1. Flare nut crowfoot2. Torque wrench
Removing and installing brake pipinga: 10mm (0.39 in)/12mm (0.47
in)
S-NT360
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BRC-8
[ABS]SYSTEM DESCRIPTION
Revision: November 2004 2005 Frontier
SYSTEM DESCRIPTION PFP:00000System Components EFS0051V
ABS Function EFS0051W The Anti-Lock Brake System detects wheel
revolution while braking and improves handling stability during
sudden braking by electrically preventing wheel lockup.
Maneuverability is also improved for avoidingobstacles.
If the electrical system malfunctions, the Fail-Safe function is
activated, the ABS becomes inoperative andthe ABS warning lamp
turns on.
The electrical system can be diagnosed using CONSULT-II. During
ABS operation, the brake pedal may vibrate lightly and a mechanical
noise may be heard. This is
normal. Just after starting the vehicle, the brake pedal may
vibrate or a motor operating noise may be heard from
engine compartment. This is a normal status of operation check.
Stopping distance may be longer than that of vehicles without ABS
when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads.EBD Function EFS0051X
Electronic Brake Distribution is a function that detects subtle
slippages between the front and rear wheels
during braking, and it improves handling stability by
electronically controlling the brake fluid pressurewhich results in
reduced rear wheel slippage.
If the electrical system malfunctions, the Fail-Safe function is
activated, the EBD and ABS become inoper-ative, and the ABS warning
lamp and brake warning lamp are turned on.
The electrical system can be diagnosed using CONSULT-II. During
EBD operation, the brake pedal may vibrate lightly and a mechanical
noise may be heard. This is
normal. Just after starting the vehicle, the brake pedal may
vibrate or a motor operating noise may be heard from
engine compartment. This is a normal status of operation
check.Fail-Safe Function EFS0051YCAUTION:If the Fail-Safe function
is activated, perform the Self Diagnosis for ABS system.ABS/EBD
SYSTEMIn case of an electrical malfunction with the ABS, the ABS
warning lamp will turn on. In case of an electricalmalfunction with
the EBD system, the brake warning lamp and the ABS warning lamp
will turn on.The system will revert to one of the following
conditions of the Fail-Safe function.
WFIA0360E
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SYSTEM DESCRIPTION
BRC-9
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1. For ABS malfunction, only the EBD is operative and the
condition of the vehicle is the same condition ofvehicles without
ABS system.
2. For EBD malfunction, the EBD and ABS become inoperative, and
the condition of the vehicle is the sameas the condition of
vehicles without ABS or EBD system.
Hydraulic Circuit Diagram EFS0051Z
WFIA0369E
1. Inlet solenoid valve 2. Outlet solenoid valve 3. Reservoir4.
Pump 5. Motor 6. Inlet valve7. Outlet valve 8. Bypass check valve
9. Damper10. Pressure switch
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BRC-10
[ABS]CAN COMMUNICATION
Revision: November 2004 2005 Frontier
CAN COMMUNICATION PFP:23710System Description EFS00520Refer to
LAN-22, "CAN COMMUNICATION" .
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TROUBLE DIAGNOSIS
BRC-11
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TROUBLE DIAGNOSIS PFP:00000How to Perform Trouble Diagnoses for
Quick and Accurate Repair EFS00521INTRODUCTIONThe ABS system has an
electronic control unit to control major func-tions. The control
unit accepts input signals from sensors and con-trols actuator
operation. It is also important to check for air leaks inthe
booster or lines, lack of brake fluid, or other malfunctions in
thebrake system.It is much more difficult to diagnose a malfunction
that occurs inter-mittently rather than continuously. Most
intermittent conditions arecaused by poor electrical connections or
damaged wiring. In thiscase, careful checking of suspicious
circuits may help prevent thereplacement of good parts.A visual
check only may not find the cause of the malfunction, so aroad test
should be performed.Before undertaking actual checks, take just a
few minutes to talk witha customer who approaches with an ABS
complaint. The customeris a very good source of information,
especially for intermittent condi-tions. Through the talks with the
customer, find out what symptomsare present and under what
conditions they occur.Start your diagnosis by looking for
conventional malfunctions first.This is one of the best ways to
troubleshoot brake malfunctions onan ABS equipped vehicle. Also
check related Service Bulletins forinformation.
SEF233G
SEF234G
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BRC-12
[ABS]TROUBLE DIAGNOSIS
Revision: November 2004 2005 Frontier
WORK FLOW
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CLARIFY CONCERN A customer's description of a vehicle concern
may vary depend-
ing on the individual. It is important to clarify the customer's
con-cern.
Ask the customer about what symptoms are present under
whatconditions. Use this information to reproduce the symptom
whiledriving.
It is also important to use the diagnosis sheet to
understandwhat type of symptoms the customer is experiencing.
EXAMPLE OF DIAGNOSIS SHEETSBR339B
WFIA0226E
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BRC-14
[ABS]TROUBLE DIAGNOSIS
Revision: November 2004 2005 Frontier
Component Parts and Harness Connector Location EFS00522
WFIA0361E
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TROUBLE DIAGNOSIS
BRC-15
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Schematic EFS00523
WFWA0164E
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BRC-16
[ABS]TROUBLE DIAGNOSIS
Revision: November 2004 2005 Frontier
Wiring Diagram ABS EFS00524
WFWA0165E
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TROUBLE DIAGNOSIS
BRC-17
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WFWA0166E
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BRC-18
[ABS]TROUBLE DIAGNOSIS
Revision: November 2004 2005 Frontier
WFWA0167E
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TROUBLE DIAGNOSIS
BRC-19
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BRC-20
[ABS]TROUBLE DIAGNOSIS
Revision: November 2004 2005 Frontier
Basic Inspection EFS00525BRAKE FLUID LEVEL, FLUID LEAK, AND
BRAKE PAD INSPECTION1. Check fluid level in the brake fluid
reservoir. If fluid level is low, add fluid.2. Check the brake
piping and around the ABS actuator and electric unit (control unit)
for leaks. If there is
leaking or seeping fluid, check the following items. If ABS
actuator and electric unit (control unit) connection is loose,
tighten the piping to the specified
torque and recheck for leaks. If there is damage to the
connection flare nut or ABS actuator and electric unit (control
unit) threads,
replace the damaged part and recheck for leaks. When there is
fluid leaking or seeping from a fluid connection, use a clean cloth
to wipe off the fluid and
recheck for leaks. If fluid is still seeping out, replace the
damaged part. If the fluid is leaking at the ABSactuator and
electric unit (control unit), replace the ABS actuator and electric
unit (control unit) assem-bly.CAUTION:The ABS actuator and electric
unit (control unit) cannot be disassembled and must be replacedas
an assembly.
3. Check the brake pads for excessive wear.POWER SYSTEM TERMINAL
LOOSENESS AND BATTERY INSPECTIONMake sure the battery positive
cable, negative cable and ground connection are not loose. In
addition, makesure the battery is sufficiently charged.ABS WARNING
LAMP INSPECTION1. Make sure ABS warning lamp turns on for
approximately 2 seconds when the ignition switch is turned ON.
If it does not, check CAN communications. If there are no errors
with the CAN communication system,check the combination meter.
Refer to DI-5, "COMBINATION METERS" .
2. Make sure the lamp turns off approximately 2 seconds after
the ignition switch is turned ON. If the lampdoes not turn off,
conduct self-diagnosis.
3. Make sure ABS warning lamp turns off approximately 2 seconds
after the engine is started. If ABS warn-ing lamp has not turned
off 10 seconds after the engine has been started, conduct
self-diagnosis of theABS actuator and electric unit (control
unit).
4. After conducting the self-diagnosis, be sure to erase the
error memory. Refer to BRC-23, "CONSULT-IIFunction (ABS)" .
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TROUBLE DIAGNOSIS
BRC-21
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Warning Lamp and Indicator Timing EFS00526
X: ON: OFF
Control Unit Input/Output Signal Standard EFS00527REFERENCE
VALUE FROM CONSULT-IICAUTION:The display shows the control unit
calculation data, so a normal value might be displayed even in
theevent the output circuit (harness) is open or short
circuited.
Condition ABSwarning lamp Remarks
When the ignition switch is OFF After the ignition switch is
turned ON for approx. 1 sec-ond
After the ignition switch is turned ON for approx. 2
sec-onds
Lamp goes off approx. 2 seconds after theengine is started.
ABS malfunction
When the ABS actuator and electric unit (con-trol unit) is
malfunctioning (power supply orground malfunction).
Monitor item Display contentData monitor
Note: Error inspectionchecklistCondition Reference value in
normal operation
FR RH SENSORFR LH SENSORRR RH SENSORRR LH SENSOR
Wheel speed
Vehicle stopped 0 [km/h (MPH)]BRC-29, "Wheel
SensorSystem"Vehicle running (Note 1)
Almost in accor-dance with speed-ometer display(within 10%)
BATTERY VOLTBattery voltage sup-plied to ABS actuatorand
electric unit (con-trol unit)
Ignition switch ON 10 to 16VBRC-33, "ABS ControlUnit Power and
GroundSystems Inspection"
CRANKING SIG Cranking statusCranking ON
Not cranking OFF
STOP LAMP SW Stop lamp switch oper-ation
Brake pedal depressed ON
Brake pedal not depressed OFF
ABS WARN LAMP ABS warning lamp ONcondition (Note 2)
ABS warning lamp ON ON BRC-37, "ABS WarningLamp Does Not ComeOn
When Ignition SwitchIs Turned On"
ABS warning lamp OFF OFF
EBD WARN LAMP EBD warning lamp sta-tusWhen EBD warning lamp is
on ON BRC-33, "CAN Commu-
nication System Inspec-tion"When EBD warning lamp is off OFF
MOTOR RELAY Operation status ofmotor and motor relay
Ignition switch ON or running(ABS not activated) OFF BRC-32,
"Actuator Motor,
Motor Relay, and CircuitInspection"Ignition switch ON or
engine
running (ABS activated) ON
ACTUATOR RLY Actuator relay opera-tion status
Vehicle stopped (Ignitionswitch ON) OFF BRC-32, "Actuator
Motor,
Motor Relay, and CircuitInspection"Vehicle stopped (Engine
run-
ning) ON
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BRC-22
[ABS]TROUBLE DIAGNOSIS
Revision: November 2004 2005 Frontier
Note 1: Confirm tire pressure is normal.Note 2: ON/OFF timing of
ABS warning lampON: For approximately 2 seconds after ignition
switch is turned ON, or when a malfunction is detected.OFF:
Approximately 2 seconds after ignition switch is turned ON (when
system is in normal operation).
FR LH IN SOLFR LH OUT SOLFR RH IN SOLFR RH OUT SOLREAR IN
SOLREAR OUT SOL
Solenoid valve opera-tion
Actuator (solenoid) is active(ACTIVE TEST with CON-SULT-II) or
actuator relay isinactive (in fail-safe mode).
ONBRC-31, "Solenoid ValveSystem Inspection"
When actuator (solenoid) isnot active and actuator relay
isactive (ignition switch ON).
OFF
ABS SIGNALEBD SIGNAL Signal status
ABS activeEBD active ON ABS system
EBD systemABS not activeEBD not active OFF
ABS FAIL SIGEBD FAIL SIG Fail signal status
ABS failEBD fail ON ABS system
EBD systemABS normalEBD normal OFF
Monitor item Display contentData monitor
Note: Error inspectionchecklistCondition Reference value in
normal operation
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TROUBLE DIAGNOSIS
BRC-23
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CONSULT-II Function (ABS) EFS00528CONSULT-II can display each
diagnostic item using the diagnostic test modes shown
following.
CONSULT-II BASIC OPERATION PROCEDURE1. Turn ignition switch
OFF.2. Connect CONSULT-II and CONSULT-II CONVERTER to the
data link connector.CAUTION:If CONSULT-II is used with no
connection of CONSULT-IICONVERTER, malfunctions might be detected
in self-diag-nosis depending on control unit which carries out
CANcommunication.
3. Turn ignition switch ON.
4. Touch START (NISSAN BASED VHCL).
5. Touch ABS in the SELECT SYSTEM screen.If ABS is not
indicated, go to GI-38, "CONSULT-II Data LinkConnector (DLC)
Circuit" .
ABS diagnostic mode Description
WORK SUPPORTSupports inspection and adjustments. Commands are
transmitted to the ABS actuator and electricunit (control unit) for
setting the status suitable for required operation, input/output
signals arereceived from the ABS actuator and electric unit
(control unit) and received data is displayed.
SELF-DIAG RESULTS Displays ABS actuator and electric unit
(control unit) self-diagnosis results.DATA MONITOR Displays ABS
actuator and electric unit (control unit) input/output data in real
time.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis
of CAN communication can be read.ACTIVE TEST Operation of
electrical loads can be checked by sending drive signal to
them.
FUNCTION TEST Conducted by CONSULT-II instead of a technician to
determine whether each system is "OK" or"NG".
ECU PART NUMBER ABS actuator and electric unit (control unit)
part number can be read.
BBIA0538E
BCIA0029E
BCIA0030E
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BRC-24
[ABS]TROUBLE DIAGNOSIS
Revision: November 2004 2005 Frontier
6. Select the required diagnostic location from the SELECT
DIAGMODE screen.For further information, see the CONSULT-II
Operation Manual.
SELF-DIAGNOSISDescriptionIf an error is detected in the system,
the ABS warning lamp will turn on. In this case, perform
self-diagnosis asfollows:Operation Procedure1. Turn ignition switch
OFF.2. Connect CONSULT-II and CONSULT-II CONVERTER to the data link
connector.
CAUTION:If CONSULT-II is used with no connection of CONSULT-II
CONVERTER, malfunctions might bedetected in self-diagnosis
depending on control unit which carries out CAN communication.
3. Turn ignition switch ON.4. Start engine and drive at
approximately 30 km/h (19 MPH) or more for approximately 1
minute.5. After stopping the vehicle, with the engine running,
touch START (NISSAN BASED VHCL), ABS,
SELF-DIAG RESULTS in order on the CONSULT-II screen.CAUTION:If
START (NISSAN BASED VHCL) is touched immediately after starting the
engine or turning onthe ignition switch, ABS might not be displayed
in the SELECT SYSTEM screen. In this case,repeat the operation from
step 1.
6. The self-diagnostic results are displayed. (If necessary, the
self-diagnostic results can be printed out bytouching PRINT.) When
NO DTC IS DETECTED is displayed, check the ABS warning lamp.
7. Conduct the appropriate inspection from the display item
list, and repair or replace the malfunctioningcomponent.
8. Start engine and drive at approximately 30 km/h (19 MPH) or
more for approximately 1 minute.CAUTION: When a wheel sensor
short-circuit is detected, if the vehicle is not driven at 30 km/h
(19 MPH)
for at least 1 minute, the ABS warning lamp will not turn off
even if the malfunction is repaired.9. Turn ignition switch OFF to
prepare for erasing the memory.10. Start the engine and touch START
(NISSAN BASED VHCL), ABS, SELF-DIAG RESULTS, ERASE
in order on the CONSULT-II screen to erase the error memory.If
ABS is not indicated, go to GI-38, "CONSULT-II Data Link Connector
(DLC) Circuit" .CAUTION:If the error memory is not erased,
re-conduct the operation from step 5.
11. For the final inspection, drive at approximately 30 km/h (19
MPH) or more for approximately 1 minute andconfirm that the ABS
warning lamp is off.
BCIA0031E
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TROUBLE DIAGNOSIS
BRC-25
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Display Item ListSelf-diagnostic item Malfunction detecting
condition Check system
FR LH SENSOR 1[C1104]
Circuit of front LH wheel sensor is open, shorted or sensor
powervoltage is unusual.
BRC-29, "Wheel SensorSystem" (Note 1)
RR RH SENSOR 1[C1101]
Circuit of rear RH wheel sensor is open, shorted or sensor
powervoltage is unusual.
FR RH SENSOR 1[C1103]
Circuit of front RH wheel sensor is open, shorted or sensor
powervoltage is unusual.
RR LH SENSOR 1[C1102]
Circuit of rear LH wheel sensor is open, shorted or sensor
powervoltage is unusual.
FR LH SENSOR 2[C1108]
ABS actuator and electric unit (control unit) cannot identify
sen-sor pulses, because of large gap between wheel sensor and
sen-sor rotor.
RR RH SENSOR 2[C1105]
ABS actuator and electric unit (control unit) cannot identify
sen-sor pulses, because of large gap between wheel sensor and
sen-sor rotor.
FR RH SENSOR 2[C1107]
ABS actuator and electric unit (control unit) cannot identify
sen-sor pulses, because of large gap between wheel sensor and
sen-sor rotor.
RR LH SENSOR 2[C1106]
ABS actuator and electric unit (control unit) cannot identify
sen-sor pulses, because of large gap between wheel sensor and
sen-sor rotor.
ABS SENSOR[C1115] Wheel sensor input is abnormal.
BATTERY VOLTAGE[ABNORMAL][C1109]
ABS actuator and electric unit (control unit) power voltage is
toolow.
BRC-33, "ABS ControlUnit Power and GroundSystems Inspection"
CONTROLLER FAILURE[C1110]
Internal malfunction of ABS actuator and electric unit
(controlunit)
BRC-30, "ABS ControlUnit Inspection"
PUMP MOTOR (Note 3)[C1111]
During actuator motor operation with ON, when actuator
motorturns OFF or when control line for actuator motor relay is
open. BRC-32, "Actuator
Motor, Motor Relay, andCircuit Inspection"During actuator motor
operation with OFF, when actuator motor
turns ON or when control line for relay is shorted to
ground.G-SENSOR[C1113] G-sensor is malfunctioning.
BRC-30, "ABS ControlUnit Inspection"
FR LH IN ABS SOL[C1120]
Circuit of front LH IN ABS solenoid is open or shorted, or
controlline is open or shorted to power supply or ground.
BRC-31, "Solenoid ValveSystem Inspection"
FR LH OUT ABS SOL[C1121]
Circuit of front LH OUT ABS solenoid is open or shorted, or
con-trol line is open or shorted to power supply or ground.
FR RH IN ABS SOL[C1122]
Circuit of front RH IN ABS solenoid is open or shorted, or
controlline is open or shorted to power supply or ground.
FR RH OUT ABS SOL[C1123]
Circuit of front RH OUT ABS solenoid is open or shorted, or
con-trol line is open or shorted to power supply or ground.
R-EV[C1190]
Circuit of rear IN ABS solenoid is open or shorted, or control
lineis open or shorted to power supply or ground.
R-AV[C1191]
Circuit of rear OUT ABS solenoid is open or shorted, or
controlline is open or shorted to power supply or ground.
ACTR RELAY CIRCUIT[C1140] ABS actuator relay or circuit
malfunction.
BRC-32, "ActuatorMotor, Motor Relay, andCircuit Inspection"
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BRC-26
[ABS]TROUBLE DIAGNOSIS
Revision: November 2004 2005 Frontier
Note 1. If wheel sensor 2 for each wheel is indicated, check ABS
actuator and electric unit (control unit) powersupply voltage in
addition to wheel sensor circuit check.Note 2. If multiple
malfunctions are detected including CAN communication line [U1000],
perform diagnosis forCAN communication line first.Note 3: "ACTUATOR
RLY" on the CONSULT-II self-diagnosis results indicates the
malfunction of the actuatormotor relay or circuit.DATA
MONITOROperation Procedure1. After turning OFF the ignition switch,
connect CONSULT-II and the CONSULT-II CONVERTER to the data
link connector.CAUTION:If CONSULT-II is used with no connection
of CONSULT-II CONVERTER, malfunctions might bedetected in
self-diagnosis depending on control unit which carries out CAN
communication.
2. Touch START (NISSAN BASED VHCL), ABS, DATA MONITOR in order
on the CONSULT-II screen.If ABS is not indicated, go to GI-38,
"CONSULT-II Data Link Connector (DLC) Circuit" .CAUTION:When START
(NISSAN BASED VHCL) is touched immediately after starting the
engine or turningon the ignition switch, ABS might not be displayed
in the SELECT SYSTEM screen. In this case,repeat the operation from
step 2.
3. Return to the SELECT MONITOR ITEM screen, and touch ECU INPUT
SIGNALS, MAIN SIGNALS orSELECTION FROM MENU. Refer to the following
information.
4. When START is touched, the data monitor screen is
displayed.Display Item List
ABS VARIANT CODING[C1170] V coding is not malfunctioning.
BRC-30, "ABS ControlUnit Inspection"
CAN COMM CIRCUIT[U1000]
CAN communication line is open or shorted. ABS actuator and
electric unit (control unit) internal malfunc-
tion Battery voltage for ECM is suddenly interrupted for
approxi-
mately 0.5 second or more.
BRC-33, "CAN Commu-nication System Inspec-tion" (Note 2)
Self-diagnostic item Malfunction detecting condition Check
system
Item(Unit)
Data monitor item selectionRemarksECU INPUT
SIGNALSMAIN
SIGNALSSELECTIONFROM MENU
FR RH SENSOR(km/h, MPH)
Wheel speed calculated by front RHwheel sensor signal is
displayed.
FR LH SENSOR(km/h, MPH)
Wheel speed calculated by front LHwheel sensor signal is
displayed.
RR RH SENSOR(km/h, MPH)
Wheel speed calculated by rear RHwheel sensor signal is
displayed.
RR LH SENSOR(km/h, MPH)
Wheel speed calculated by rear LHwheel sensor signal is
displayed.
BATTERY VOLT(V)
Voltage supplied to ABS actuatorand electric unit (control unit)
is dis-played.
STOP LAMP SW(ON/OFF)
Stop lamp switch (ON/OFF) statusis displayed.
ABS WARN LAMP(ON/OFF)
ABS warning lamp (ON/OFF) statusis displayed.
EBD WARN LAMP Brake warning lamp (ON/OFF) sta-tus is
displayed.FR LH IN SOL(ON/OFF)
Front LH IN ABS solenoid (ON/OFF) status is displayed.
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TROUBLE DIAGNOSIS
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: Applicable: Not applicable
ACTIVE TESTCAUTION: Do not perform active test while driving.
Make sure to completely bleed air from the brake system. The ABS
and brake warning lamps turn on during the active test.Operation
Procedure1. Connect the CONSULT-II and CONSULT-II CONVERTER to the
data link connector and start the engine.
CAUTION:If CONSULT-II is used with no connection of CONSULT-II
CONVERTER, malfunctions might bedetected in self-diagnosis
depending on control unit which carries out CAN communication.
2. Touch START (NISSAN BASED VHCL) on the display screen.3.
Touch ABS.
If ABS is not indicated, go to GI-38, "CONSULT-II Data Link
Connector (DLC) Circuit" .4. Touch ACTIVE TEST.
FR LH OUT SOL(ON/OFF)
Front LH OUT ABS solenoid (ON/OFF) status is displayed.
FR RH IN SOL(ON/OFF)
Front RH IN ABS solenoid (ON/OFF) status is displayed.
FR RH OUT SOL(ON/OFF)
Front RH OUT ABS solenoid (ON/OFF) status is displayed.
REAR IN SOL(ON/OFF)
Rear IN ABS solenoid (ON/OFF)status is displayed.
REAR OUT SOL(ON/OFF)
Rear OUT ABS solenoid (ON/OFF)status is displayed.
MOTOR RELAY(ON/OFF)
ABS motor relay signal (ON/OFF)status is displayed.
ACTUATOR RLY(ON/OFF)
ABS actuator relay signal (ON/OFF) status is displayed.
ABS FAIL SIG(ON/OFF)
ABS fail signal (ON/OFF) status isdisplayed.
EBD FAIL SIG(ON/OFF)
EBD fail signal (ON/OFF) status isdisplayed.
EBD SIGNAL(ON/OFF)
EBD operation (ON/OFF) status isdisplayed.
ABS SIGNAL(ON/OFF)
ABS operation (ON/OFF) status isdisplayed.
CRANKING SIG The input state of the key SWSTART position signal
is displayed.
Item(Unit)
Data monitor item selectionRemarksECU INPUT
SIGNALSMAIN
SIGNALSSELECTIONFROM MENU
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BRC-28
[ABS]TROUBLE DIAGNOSIS
Revision: November 2004 2005 Frontier
5. The SELECT TEST ITEM screen is displayed.6. Touch necessary
test item.
7. With the MAIN SIGNALS display selected, touch START.8. The
Active Test screen will be displayed, so conduct the following
test.Solenoid Valve Operation Chart
*: ON for 1 to 2 seconds after the touch, and then OFF
NOTE: If active test is performed with brake pedal depressed,
pedal stroke may change. This is normal. TEST IS STOPPED is
displayed approximately 10 seconds after operation starts. After
TEST IS STOPPED is displayed, to perform test again, repeat Step
6.ABS MotorTouch ON and OFF on the screen. Check that ABS motor
relayoperates as shown in table below.
NOTE: If active test is performed with brake pedal depressed,
pedal
stroke may change. This is normal. TEST IS STOPPED is displayed
approximately 10 seconds
after operation starts.
LBR379
OperationABS solenoid valve ABS solenoid valve (ACT)
UP KEEP DOWN UP ACTUA-TOR UPACTUA-
TOR KEEPFR RH SOLFR RH ABS SOLE-NOID (ACT)
FR RH IN SOL OFF ON ON OFF OFF OFF
FR RH OUT SOL OFF OFF ON* OFF OFF OFF
FR LH SOLFR LH ABS SOLE-NOID (ACT)
FR LH IN SOL OFF ON ON OFF OFF OFF
FR LH OUT SOL OFF OFF ON* OFF OFF OFF
REAR SOLREAR IN SOL OFF ON ON OFF OFF OFFREAR OUT SOL OFF OFF
ON* OFF OFF OFF
Operation ON OFFABS actuator relay ON ONABS motor relay ON
OFF
SFIA0593E
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TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
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TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS PFP:00000Wheel
Sensor System EFS00529INSPECTION PROCEDURE1. CONNECTOR
INSPECTIONDisconnect the ABS actuator and electric unit (control
unit) connector E125 and wheel sensor of malfunction-ing code.Check
the terminals for deformation, disconnection, looseness or
damage.OK or NGOK >> GO TO 2.NG >> Repair or replace as
necessary.
2. CHECK WHEEL SENSOR OUTPUT SIGNAL1. Connect ABS active wheel
sensor tester (J-45741) to wheel sensor using appropriate
adapter.2. Turn on the ABS active wheel sensor tester power
switch.
NOTE:The green POWER indicator should illuminate. If the POWER
indicator does not illuminate, replace thebattery in the ABS active
wheel sensor tester before proceeding.
3. Spin the wheel of the vehicle by hand and observe the red
SENSOR indicator on the ABS active wheelsensor tester. The red
SENSOR indicator should flash on and off to indicate an output
signal.NOTE:If the red SENSOR indicator illuminates but does not
flash, reverse the polarity of the tester leads and
retest.Does the ABS active wheel sensor tester detect a
signal?YES >> GO TO 3.NO >> Replace the wheel sensor.
Refer to BRC-38, "Removal and Installation" .
3. CHECK TIRESCheck for inflation pressure, wear and size of
each tire. Refer to WT-31, "SERVICE DATA AND SPECIFICA-TIONS (SDS)"
.Are tire pressure and size correct and is tire wear within
specifications?YES >> GO TO 4.NO >> Adjust tire
pressure or replace tire(s).
4. CHECK WHEEL BEARINGSCheck wheel bearing axial end play. Refer
to FAX-5, "WHEEL BEARING INSPECTION" , RAX-6, "Rear AxleBearing"
(C200) or RAX-18, "Rear Axle Bearing" (M226).OK or NGOK >> GO
TO 5.NG >> Repair or replace as necessary. Refer to FAX-5,
"Removal and Installation" , RAX-6, "Rear Axle
Bearing" (C200) or RAX-18, "Rear Axle Bearing" (M226).
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BRC-30
[ABS]TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: November 2004 2005 Frontier
5. CHECK WIRING HARNESS FOR SHORT CIRCUIT1. Disconnect ABS
actuator and electric unit (control unit) connec-
tor and wheel sensor connector of malfunction code No.2. Check
resistance between wheel sensor harness connector ter-
minals and ground.
OK or NGOK >> GO TO 6.NG >> Repair the circuit.
6. CHECK WIRING HARNESS FOR OPEN CIRCUITCheck continuity between
ABS actuator and electric unit (control unit) harness connector and
wheel sensorharness connector.
OK or NGOK >> Replace the ABS actuator and electric unit
(control unit). Refer to BRC-40, "Removal and Installa-
tion" .NG >> Repair the circuit.
ABS Control Unit Inspection EFS0052BINSPECTION PROCEDURE1.
SELF-DIAGNOSIS RESULT CHECKCheck self-diagnosis results.
Is the above displayed in the self-diagnosis display items?YES
>> Replace ABS actuator and electric unit (control unit).
Refer to BRC-40, "Removal and Installation"
.
NO >> Inspection End.
Continuity should not exist.
WFIA0343E
Wheel sensorABS actuator and
electric unit (control unit) Wheel sensor ContinuityConnector
Terminals Connector Terminals
Front LH
E125
45E18
1
Yes
46 2
Front RH34
E1171
33 2
Rear LH37
C112
36 1
Rear RH42
C102
43 1
Continuity should exist.
Self-diagnosis resultsCONTROLLER FAILURE
G-SENSORABS VARIANT CODING
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TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
BRC-31
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Solenoid Valve System Inspection EFS0052CINSPECTION PROCEDURE1.
SELF-DIAGNOSIS RESULT CHECKCheck self-diagnosis results.
Is the above displayed in the self-diagnosis display items?YES
>> GO TO 2.NO >> Inspection End.
2. CONNECTOR INSPECTION1. Disconnect ABS actuator and electric
unit (control unit) connector E125.2. Check the terminals for
deformation, disconnection, looseness or damage.OK or NGOK >>
GO TO 3.NG >> Repair or replace as necessary.
3. CHECKING SOLENOID POWER AND GROUND1. Check voltage between
ABS actuator and electric unit (control
unit) harness connector E125 and body ground.
2. Check resistance between ABS actuator and electric unit
(con-trol unit) harness connector E125 and body ground.
OK or NGOK >> Perform self-diagnosis again. If the same
results
appear, replace ABS actuator and electric unit (controlunit).
Refer to BRC-40, "Removal and Installation" .
NG >> Repair the circuit.
Self-diagnosis resultsFR LH IN ABS SOL
FR LH OUT ABS SOLFR RH IN ABS SOL
FR RH OUT ABS SOLR-EV
R-AV
ABS actuator and electricunit (control unit) harness
connector E125Body
groundMeasured
value(Approx.)
32 12V
WFIA0195E
ABS actuator and electricunit (control unit) harness
connector E125Body
groundMeasuredvalue
(Approx.)16 047 0
WFIA0196E
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BRC-32
[ABS]TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: November 2004 2005 Frontier
Actuator Motor, Motor Relay, and Circuit Inspection
EFS0052DINSPECTION PROCEDURE1. CHECKING SELF-DIAGNOSIS RESULTSCheck
self-diagnosis results.
Is the above displayed in the self-diagnosis display items?YES
>> GO TO 2.NO >> Inspection End.
2. CONNECTOR INSPECTION1. Disconnect ABS actuator and electric
unit (control unit) connector E125.2. Check the terminals for
deformation, disconnection, looseness or damage.OK or NGOK >>
GO TO 3.NG >> Repair or replace as necessary.
3. CHECKING ABS MOTOR AND MOTOR RELAY POWER SYSTEM1. Check
voltage between ABS actuator and electric unit (control
unit) harness connector E125 and ground.
2. Check resistance between ABS actuator and electric unit
(con-trol unit) connector E125 and ground.
OK or NGOK >> Perform self-diagnosis again. If the same
results
appear, replace ABS actuator and electric unit (controlunit).
Refer to BRC-40, "Removal and Installation" .
NG >> Repair the circuit.
Self-diagnosis resultsPUMP MOTOR
ACTUATOR RLY
ABS actuator and electricunit (control unit) harness
connector E125Body
groundMeasured
value(Approx.)
1 12V
WFIA0209E
ABS actuator and electricunit (control unit)
harness connector E125Body
groundMeasured
value(Approx.)
16 047 0
WFIA0196E
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TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
BRC-33
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ABS Control Unit Power and Ground Systems Inspection
EFS0052FINSPECTION PROCEDURE1. SELF-DIAGNOSIS RESULT CHECKCheck
self-diagnosis results.
Is the above displayed in the self-diagnosis display items?YES
>> GO TO 2.NO >> Inspection End.
2. CONNECTOR INSPECTION1. Disconnect the ABS actuator and
electric unit (control unit) connector E125.2. Check the terminals
for deformation, disconnection, looseness or damage.OK or NGOK
>> GO TO 3.NG >> Repair or replace as necessary.
3. ABS CONTROL UNIT POWER AND GROUND CIRCUIT INSPECTIONMeasure
the voltage and continuity between the ABS actuator and electric
unit (control unit) harness connec-tor E125 and ground.
OK or NGOK >> Check the battery for loose terminals, low
voltage, etc. Repair as necessary.NG >> Repair the
circuit.
CAN Communication System Inspection EFS0052GINSPECTION
PROCEDURE1. CHECK CONNECTOR1. Turn ignition switch OFF, disconnect
the ABS actuator and electric unit (control unit) connector and
check
the terminals for deformation, disconnection, looseness, and so
on. If there is a malfunction, repair orreplace the terminal.
2. Reconnect connector to perform self-diagnosis.Is "CAN COMM
CIRCUIT" displayed in self-diagnosis display items?YES >>
Print out the self-diagnostic results, and refer to LAN-22, "CAN
COMMUNICATION" .NO >> Connector terminal is loose, damaged,
open, or shorted.
Self-diagnosis resultsBATTERY VOLTAGE
Signal nameABS actuator and electric unit
(control unit)harness connector E125
Bodyground Measured value
Power supply1
Battery voltage (Approx. 12V)32
Ground16
Continuity should exist.47
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BRC-34
[ABS]TROUBLE DIAGNOSES FOR SYMPTOMS
Revision: November 2004 2005 Frontier
TROUBLE DIAGNOSES FOR SYMPTOMS PFP:99999ABS Works Frequently
EFS005F0
1. CHECK WARNING LAMP ACTIVATIONMake sure warning lamp remains
off while driving.OK or NGOK >> GO TO 2.NG >> Carry out
self-diagnosis. Refer to BRC-24, "SELF-DIAGNOSIS" .
2. CHECK WHEEL SENSORSCheck the following. Wheel sensor mounting
for looseness Wheel sensors for physical damage Wheel sensor
connectors for terminal damage or loose connections Sensor rotor
and mount for physical damage (rear only)OK or NGOK >> GO TO
3.NG >> Repair or replace as necessary.
3. CHECK FRONT AND REAR AXLESCheck front and rear axles for
excessive looseness. Refer to FAX-5, "WHEEL BEARING INSPECTION"
,RAX-6, "Rear Axle Bearing" (C200) or RAX-18, "Rear Axle Bearing"
(M226).OK or NGOK >> GO TO 4.NG >> Repair as
necessary.
4. CHECK BRAKE FLUID PRESSURECheck brake fluid pressure
distribution.Refer to BRC-20, "Basic Inspection" .Is brake fluid
pressure distribution normal?YES >> Inspection End.NO
>> Perform Basic Inspection. Refer to BRC-20, "Basic
Inspection" .
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TROUBLE DIAGNOSES FOR SYMPTOMS
BRC-35
[ABS]
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Unexpected Pedal Action EFS005F1
1. CHECK WARNING LAMP ACTIVATIONMake sure warning lamp remains
off while driving.OK or NGOK >> GO TO 2.NG >> Carry out
self-diagnosis. Refer to BRC-24, "SELF-DIAGNOSIS" .
2. CHECK BRAKE PEDAL STROKECheck brake pedal stroke.Is brake
pedal stroke excessive?YES >> Perform Basic Inspection. Refer
to BRC-20, "Basic
Inspection" .NO >> GO TO 3.
3. CHECK CONNECTOR AND BRAKING PERFORMANCE1. Disable ABS by
disconnecting ABS actuator and electric unit (control unit)
connector.2. Drive vehicle and check brake operation.
NOTE: Stopping distance may be longer than vehicles without ABS
when road condition is slippery. Driving the vehicle with the ABS
actuator and electric unit (control unit) disconnected may induce
DTCs
in electrical control units using CAN communication. After the
inspection, clear all DTCs. Refer to LAN-22, "CAN COMMUNICATION"
.
OK or NGOK >> GO TO 4.NG >> Perform Basic
Inspection. Refer to BRC-20, "Basic Inspection" .
4. CHECK WHEEL SENSORSCheck the following. Wheel sensor mounting
for looseness Wheel sensors for physical damage Wheel sensor
connectors for terminal damage or loose connectionsOK or NGOK
>> Check ABS actuator and electric unit (control unit)
connector terminals for deformation, discon-
nection, looseness or damage. Reconnect ABS actuator and
electric unit (control unit) harnessconnector. Then retest.
NG >> Repair or replace as necessary.
SBR540A
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BRC-36
[ABS]TROUBLE DIAGNOSES FOR SYMPTOMS
Revision: November 2004 2005 Frontier
Long Stopping Distance EFS005F2
1. CHECK BASE BRAKING SYSTEM PERFORMANCE1. Disable ABS by
disconnecting ABS actuator and electric unit (control unit)
connector.2. Drive vehicle and check brake operation.
NOTE: Stopping distance may be longer than vehicles without ABS
when road condition is slippery. Driving the vehicle with the ABS
actuator and electric unit (control unit) disconnected may induce
DTCs
in electrical control units using CAN communication. After the
inspection, clear all DTCs. Refer to LAN-22, "CAN COMMUNICATION"
.
OK or NGOK >> Go to BRC-34, "ABS Works Frequently" .NG
>> Perform Basic Inspection. Refer to BRC-20, "Basic
Inspection" .
ABS Does Not Work EFS005F3CAUTION:The ABS does not operate when
the vehicle speed is 10 km/h (6 MPH) or less.
1. CHECK WARNING LAMP ACTIVATIONTurn ignition switch ON and
check for warning lamp activation. Warning lamp should activate for
approximately 2 seconds after turning the ignition switch ON.OK or
NGOK >> Carry out self-diagnosis. Refer to BRC-24,
"SELF-DIAGNOSIS" .NG >> Go to BRC-37, "ABS Warning Lamp Does
Not Come On When Ignition Switch Is Turned On" .
Pedal Vibration or ABS Operation Noise EFS005F4NOTE:During ABS
activation, pedal vibration may be felt and a noise may be heard.
This is normal and does not indi-cate a malfunction.
1. CHECK SYMPTOM1. Apply brake.2. Start engine.Does the symptom
occur only when engine is started?YES >> Carry out
self-diagnosis. Refer to BRC-24, "SELF-DIAGNOSIS" .NO >> GO
TO 2.
2. RECHECK SYMPTOMDoes the symptom occur only when electrical
equipment switches (such as headlamps) are turned on?
YES >> Check for radio, antenna or related wiring that is
routed too close to the ABS actuator and electricunit (control
unit) and reroute as necessary.
NO >> Go to BRC-34, "ABS Works Frequently" .
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TROUBLE DIAGNOSES FOR SYMPTOMS
BRC-37
[ABS]
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ABS Warning Lamp Does Not Come On When Ignition Switch Is Turned
On EFS005F5
1. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
FUSESCheck 30A fusible link n and 40A fusible link l for ABS
actuator and electric unit (control unit). For fusible linklayout,
refer to PG-4, "POWER SUPPLY ROUTING CIRCUIT" .OK or NGOK >>
GO TO 2.NG >> If fusible link is blown, be sure to eliminate
cause of problem before replacing.
2. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER
SUPPLY CIRCUITS1. Disconnect ABS actuator and electric unit
(control unit) connec-
tor.2. Check voltage between ABS actuator and electric unit
(control
unit) connector terminal 1 and ground and terminal 32
andground.
Does battery voltage exist?YES >> GO TO 3.NO >>
Repair harness or connectors between fusible link and
ABS actuator and electric unit (control unit).
3. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) GROUND
CIRCUITCheck continuity between ABS actuator and electric unit
(controlunit) connector terminal 16 and ground and terminal 47 and
ground.Does continuity exist?YES >> Replace ABS actuator and
electric unit (control unit).
Refer to BRC-40, "Removal and Installation" .NO >> Repair
harness or connectors between ABS actuator
and electric unit (control unit) and ground.
ABS Warning Lamp Stays On When Ignition Switch Is Turned On
EFS005F6
1. CARRY OUT SELF-DIAGNOSISCarry out self-diagnosis. Refer to
BRC-24, "SELF-DIAGNOSIS" .Are malfunctions detected in
self-diagnosis?YES >> Refer to BRC-25, "Display Item List"
.NO >> Refer to DI-34, "WARNING LAMPS" .
WFIA0199E
WFIA0196E
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BRC-38
[ABS]WHEEL SENSORS
Revision: November 2004 2005 Frontier
WHEEL SENSORS PFP:47910Removal and Installation EFS0052O
REMOVAL1. Remove wheel sensor mounting screw(s).
When removing the front wheel sensor, first remove the disc
rotor to gain access to the front wheel sen-sor. Refer to BR-23,
"Removal and Installation of Brake Caliper Assembly and Disc Rotor"
.
2. Pull out the sensor, being careful to turn it as little as
possible.CAUTION: Be careful not to damage sensor edge and sensor
rotor teeth. Do not pull on the sensor harness.
3. Disconnect wheel sensor harness electrical connector, then
remove harness from mounts.INSTALLATION Before installing wheel
sensors, Inspect and replace sensor assembly if damaged. Clean
wheel sensor hole and mounting surface with brake cleaner and a
lint-free shop rag. Be careful that
dirt and debris do not enter the axle. Replace wheel sensor
O-ring, then apply a coat of suitable grease to the O-ring and
mounting hole. Installation is in the reverse order of removal.
1. Front wheel sensor 2. Rear wheel sensor (C200) 3. Rear wheel
sensor (M226)WFIA0339E
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SENSOR ROTOR
BRC-39
[ABS]
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SENSOR ROTOR PFP:47970Removal and Installation EFS0052PFRONTThe
wheel sensor rotors are built into the wheel hubs and are not
removable. If damaged, replace wheel huband bearing assembly. Refer
to FAX-5, "Removal and Installation" .REAR (C200)Removal and
InstallationIt is necessary to disassemble the rear axle to replace
the sensor rotor. Perform the axle shaft assemblyremoval procedure
to replace sensor rotor. Refer to RAX-7, "Removal and Installation"
.REAR (M226)Removal1. Remove axle shaft assembly. Refer to RAX-19,
"Removal and Installation" .
NOTE:It is necessary to disassemble the rear axle to replace the
sensor rotor.
2. Pull the sensor rotor of off the axle shaft using Tool and a
press.
Installation1. Install new sensor rotor on axle shaft using a
suitable length
steel tube and a press. Make sure sensor rotor is fully
seated.CAUTION:Do not reuse the old sensor rotor.
2. Install axle shaft assembly. Refer to RAX-19, "Removal
andInstallation" .CAUTION:Do not reuse the axle oil seal. The axle
oil seal must bereplaced every time the axle shaft assembly is
removedfrom the axle shaft housing.
Tool number : 205-D002 ( )
WFIA0341E
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BRC-40
[ABS]ACTUATOR AND ELECTRIC UNIT (ASSEMBLY)
Revision: November 2004 2005 Frontier
ACTUATOR AND ELECTRIC UNIT (ASSEMBLY) PFP:47660Removal and
Installation EFS0059P
REMOVAL1. Disconnect the negative battery terminal.2. Drain the
brake fluid. Refer to BR-9, "Drain and Refill" .3. Disconnect the
actuator harness from the ABS actuator and electric unit (control
unit).
CAUTION: To remove the brake tubes, use a flare nut wrench to
prevent the flare nuts and brake tubes from
being damaged. Be careful not to splash brake fluid on painted
areas.
4. Disconnect the brake tubes.5. Remove the three bolts and
remove the ABS actuator and electric unit (control unit).
1. To rear 2. To front left 3. To front right4. From the master
cylinder secondary
side5. From the master cylinder primary
side6. ABS actuator and electric unit (con-
trol unit)7. Harness connector 8. Grommet 9. Collar
WFIA0388E
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ACTUATOR AND ELECTRIC UNIT (ASSEMBLY)
BRC-41
[ABS]
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INSTALLATIONInstallation is in the reverse order of
removal.CAUTION:To install, use a flare nut wrench (commercial
service tool). Always tighten brake tubes to specification when
installing. Refer to BR-11, "Hydraulic Circuit" . Never reuse
drained brake fluid. After installation of the ABS actuator and
electric unit (control unit), refill brake system with new
brake fluid. Then bleed the air from the system. Refer to BR-10,
"Bleeding Brake System" .
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BRC-42
[ABLS/ABS]PRECAUTIONS
Revision: November 2004 2005 Frontier
PRECAUTIONS PFP:00001Precautions for Supplemental Restraint
System (SRS) AIR BAG and SEATBELT PRE-TENSIONER EFS005SLThe
Supplemental Restraint System such as AIR BAG and SEAT BELT
PRE-TENSIONER, used alongwith a front seat belt, helps to reduce
the risk or severity of injury to the driver and front passenger
for certaintypes of collision. This system includes seat belt
switch inputs and dual stage front air bag modules. The SRSsystem
uses the seat belt switches to determine the front air bag
deployment, and may only deploy one frontair bag, depending on the
severity of a collision and whether the front occupants are belted
or unbelted.Information necessary to service the system safely is
included in the SRS and SB section of this Service Man-ual.WARNING:
To avoid rendering the SRS inoperative, which could increase the
risk of personal injury or death
in the event of a collision which would result in air bag
inflation, all maintenance must be per-formed by an authorized
NISSAN/INFINITI dealer.
Improper maintenance, including incorrect removal and
installation of the SRS, can lead to per-sonal injury caused by
unintentional activation of the system. For removal of Spiral Cable
and AirBag Module, see the SRS section.
Do not use electrical test equipment on any circuit related to
the SRS unless instructed to in thisService Manual. SRS wiring
harnesses can be identified by yellow and/or orange harnesses
orharness connectors.
Precautions for Brake System EFS0059RCAUTION: Refer to MA-11,
"RECOMMENDED FLUIDS AND LUBRICANTS" for recommended brake fluid.
Never reuse drained brake fluid. Be careful not to splash brake
fluid on painted areas; it may cause paint damage. If brake fluid
is
splashed on painted areas, wash it away with water immediately.
To clean or wash all parts of master cylinder and disc brake
caliper, use clean brake fluid. Never use mineral oils such as
gasoline or kerosene. They will ruin rubber parts of the
hydraulic
system. Use flare nut wrench when removing and installing
brake
tube. If a brake fluid leak is found, the part must be
disassembled
without fail. Then it has to be replaced with a new one if
adefect exists.
Turn the ignition switch OFF and remove the connector ofthe ABS
actuator and electric unit (control unit) or the bat-tery terminal
before performing the work.
Always torque brake lines when installing. Burnish the brake
contact surfaces after refinishing or
replacing rotors, after replacing pads, or if a soft pedaloccurs
at very low mileage.Refer to BR-26, "BRAKE BURNISHING PROCEDURE"
(front disc brake) or BR-32, "BRAKE BUR-NISHING PROCEDURE" (rear
disc brake).
WARNING: Clean brake pads and shoes with a waste cloth, then
wipe with a dust collector.Precautions When Using CONSULT-II
EFS0059SWhen connecting CONSULT-II to data link connector, connect
them through CONSULT-II CONVERTER.CAUTION:If CONSULT-II is used
with no connection of CONSULT-II CONVERTER, malfunctions might
bedetected in self-diagnosis depending on control unit which
carries out CAN communication.CHECK POINTS FOR USING CONSULT-II1.
Has CONSULT-II been used without connecting CONSULT-II CONVERTER on
this vehicle?
If YES, GO TO 2.
SBR686C
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PRECAUTIONS
BRC-43
[ABLS/ABS]
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If NO, GO TO 5.2. Is there any indication other than indications
relating to CAN communication system in the self-diagnosis
results? If YES, GO TO 3. If NO, GO TO 4.
3. Based on self-diagnosis results unrelated to CAN
communication, carry out the inspection.4. Malfunctions may be
detected in self-diagnosis depending on control units carrying out
CAN communica-
tion. Therefor, erase the self-diagnosis results.5. Diagnose CAN
communication system. Refer to LAN-22, "CAN COMMUNICATION"
.Precautions for Brake Control EFS0059T During ABS operation, the
brake pedal may vibrate lightly and a mechanical noise may be
heard. This is
normal. Just after starting vehicle, the brake pedal may vibrate
or a motor operating noise may be heard from
engine compartment. This is a normal status of operation check.
Stopping distance may be longer than that of vehicles without ABS
when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads. When an error is
indicated by ABS or another warning lamp, collect all necessary
information from cus-
tomer (what symptoms are present under what conditions) and
check for simple causes before startingdiagnosis. Besides
electrical system inspection, check brake booster operation, brake
fluid level, and fluidleaks.
If incorrect tire sizes or types are installed on the vehicle or
brake pads are not Genuine NISSAN parts,stopping distance or
steering stability may deteriorate.
If there is a radio, antenna or related wiring near control
module, ABS function may have a malfunction orerror.
If aftermarket parts (car stereo, CD player, etc.) have been
installed, check for incidents such as harnesspinches, open
circuits or improper wiring.
Precautions for CAN System EFS0059U Do not apply voltage of 7.0V
or higher to terminal to be measured. Maximum open terminal voltage
of tester in use must be less than 7.0V. Before checking harnesses,
turn ignition switch OFF and disconnect battery negative cable.
Area to be repaired must be soldered and wrapped with tape.
Make sure that fraying of twisted wire is within 110 mm (4.33
in).
Do not make a bypass connection to repaired area. (If the
circuitis bypassed, characteristics of twisted wire will be
lost.)
PKIA0306E
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BRC-44
[ABLS/ABS]PRECAUTIONS
Revision: November 2004 2005 Frontier
Wiring Diagrams and Trouble Diagnosis EFS0059VWhen you read
wiring diagrams, refer to the following: GI-15, "How to Read Wiring
Diagrams". PG-4, "POWER SUPPLY ROUTING CIRCUIT".When you perform
trouble diagnosis, refer to the following: GI-11, "HOW TO FOLLOW
TEST GROUPS IN TROUBLE DIAGNOSES". GI-27, "How to Perform Efficient
Diagnosis for an Electrical Incident".
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PREPARATION
BRC-45
[ABLS/ABS]
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PREPARATION PFP:00002Special Service Tool EFS0052XThe actual
shapes of Kent-Moore tools may differ from those of special service
tools illustrated here.
Commercial Service Tools EFS0052Y
Tool number(Kent-Moore No.)Tool name
Description
(J-45741)ABS active wheel sensor tester
Checking operation of ABS active wheelsensors
205-D002( )Bearing splitter
Removing axle shaft bearingWFIA0101E
ZZA0700D
Tool name Description1. Flare nut crowfoot2. Torque wrench
Removing and installing brake pipinga: 10mm (0.39 in)/12mm (0.47
in)
S-NT360
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BRC-46
[ABLS/ABS]SYSTEM DESCRIPTION
Revision: November 2004 2005 Frontier
SYSTEM DESCRIPTION PFP:00000System Components EFS0052Z
WFIA0362E
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SYSTEM DESCRIPTION
BRC-47
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ABS Function EFS00530 The Anti-Lock Brake System detects wheel
revolution while braking and improves handling stability during
sudden braking by electrically preventing wheel lockup.
Maneuverability is also improved for avoidingobstacles.
If the electrical system malfunctions, the Fail-Safe function is
activated, the ABS becomes inoperative andthe ABS warning lamp
turns on.
The electrical system can be diagnosed using CONSULT-II. During
ABS operation, the brake pedal may vibrate lightly and a mechanical
noise may be heard. This is
normal. Just after starting the vehicle, the brake pedal may
vibrate or a motor operating noise may be heard from
engine compartment. This is a normal status of operation check.
Stopping distance may be longer than that of vehicles without ABS
when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads.EBD Function EFS00531
Electronic Brake Distribution is a function that detects subtle
slippages between the front and rear wheels
during braking, and it improves handling stability by
electronically controlling the brake fluid pressurewhich results in
reduced rear wheel slippage.
If the electrical system malfunctions, the Fail-Safe function is
activated, the EBD and ABS become inoper-ative, and the ABS warning
lamp and brake warning lamp are turned on.
The electrical system can be diagnosed using CONSULT-II. During
EBD operation, the brake pedal may vibrate lightly and a mechanical
noise may be heard. This is
normal. Just after starting the vehicle, the brake pedal may
vibrate or a motor operating noise may be heard from
engine compartment. This is a normal status of operation
check.ABLS Function EFS00532 Active brake limited slip is a
function to improve vehicle traction. Spinning of the drive wheels
is detected
by the ABS actuator and electric unit (control unit) using
inputs from the wheel speed sensors. If wheelspin occurs, the ABLS
system brakes the spinning wheel which distributes the driving
power to the otherdrive wheel.
The SLIP indicator lamp flashes to inform the driver of ABLS
operation. During ABLS operation, the brake pedal may vibrate
lightly and a mechanical noise may be heard. This is
normal.
Fail-Safe Function EFS00533CAUTION:If the Fail-Safe function is
activated, perform the Self Diagnosis for ABS/ABLS system.ABS/EBD
SYSTEMIn case of an electrical malfunction with the ABS, the ABS
warning lamp will turn on. In case of an electricalmalfunction with
the EBD system, the brake warning lamp and ABS warning lamp will
turn on.The system will revert to one of the following conditions
of the Fail-Safe function.1. For ABS malfunction, only the EBD is
operative and the condition of the vehicle is the same condition
of
vehicles without ABS/ABLS system.2. For EBD malfunction, the EBD
and ABS become inoperative, and the condition of the vehicle is the
same
as the condition of vehicles without ABS/ABLS or EBD system.ABLS
SYSTEMIn case of an ABLS system malfunction, the SLIP indicator
lamp will turn on. The condition of the vehicle is thesame as the
condition of vehicles without ABS/ABLS system.
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BRC-48
[ABLS/ABS]SYSTEM DESCRIPTION
Revision: November 2004 2005 Frontier
Hydraulic Circuit Diagram EFS00534
WFIA0363E
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CAN COMMUNICATION
BRC-49
[ABLS/ABS]
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CAN COMMUNICATION PFP:23710System Description EFS00535Refer to
LAN-22, "CAN COMMUNICATION" .
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BRC-50
[ABLS/ABS]TROUBLE DIAGNOSIS
Revision: November 2004 2005 Frontier
TROUBLE DIAGNOSIS PFP:00000How to Perform Trouble Diagnoses for
Quick and Accurate Repair EFS00536INTRODUCTIONThe ABS/ABLS system
has an electronic control unit to control majorfunctions. The
control unit accepts input signals from sensors andcontrols
actuator operation. It is also important to check for air leaksin
the booster or lines, lack of brake fluid, or other malfunctions in
thebrake system.It is much more difficult to diagnose a malfunction
that occurs inter-mittently rather than continuously. Most
intermittent conditions arecaused by poor electrical connections or
damaged wiring. In thiscase, careful checking of suspicious
circuits may help prevent thereplacement of good parts.A visual
check only may not find the cause of the malfunction, so aroad test
should be performed.Before undertaking actual checks, take just a
few minutes to talk witha customer who approaches with an ABS/ABLS
complaint. The cus-tomer is a very good source of information,
especially for intermittentconditions. Through the talks with the
customer, find out what symp-toms are present and under what
conditions they occur.Start your diagnosis by looking for
conventional malfunctions first.This is one of the best ways to
troubleshoot brake malfunctions onan ABS/ABLS equipped vehicle.
Also check related Service Bulletinsfor information.
SEF233G
SEF234G
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TROUBLE DIAGNOSIS
BRC-51
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WORK FLOW
WFIA0364E
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BRC-52
[ABLS/ABS]TROUBLE DIAGNOSIS
Revision: November 2004 2005 Frontier
CLARIFY CONCERN A customer's description of a vehicle concern
may vary depend-
ing on the individual. It is important to clarify the customer's
con-cern.
Ask the customer about what symptoms are present under
whatconditions. Use this information to reproduce the symptom
whiledriving.
It is also important to use the diagnosis sheet to
understandwhat type of symptoms the customer is experiencing.
EXAMPLE OF DIAGNOSIS SHEETSBR339B
WFIA0365E
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TROUBLE DIAGNOSIS
BRC-53
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Component Parts and Harness Connector Location EFS00537
WFIA0366E
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BRC-54
[ABLS/ABS]TROUBLE DIAGNOSIS
Revision: November 2004 2005 Frontier
Schematic EFS00538
WFWA0169E
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TROUBLE DIAGNOSIS
BRC-55
[ABLS/ABS]
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Revision: November 2004 2005 Frontier
Wiring Diagram ABLS EFS00539
WFWA0170E
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BRC-56
[ABLS/ABS]TROUBLE DIAGNOSIS
Revision: November 2004 2005 Frontier
WFWA0171E
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TROUBLE DIAGNOSIS
BRC-57
[ABLS/ABS]
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WFWA0172E
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BRC-58
[ABLS/ABS]TROUBLE DIAGNOSIS
Revision: November 2004 2005 Frontier
WFWA0173E
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TROUBLE DIAGNOSIS
BRC-59
[ABLS/ABS]
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Basic Inspection EFS0053ABRAKE FLUID LEVEL, FLUID LEAK, AND
BRAKE PAD INSPECTION1. Check fluid level in the brake fluid
reservoir. If fluid level is low, add fluid.2. Check the brake
piping and around the ABS actuator and electric unit (control unit)
for leaks. If there is
leaking or seeping fluid, check the following items. If ABS
actuator and electric unit (control unit) connection is loose,
tighten the piping to the specified
torque and recheck for leaks. If there is damage to the
connection flare nut or ABS actuator and electric unit (control
unit) threads,
replace the damaged part and recheck for leaks. When there is
fluid leaking or seeping from a fluid connection, use a clean cloth
to wipe off the fluid and
recheck for leaks. If fluid is still seeping out, replace the
damaged part. If the fluid is leaking at the ABSactuator and
electric unit (control unit), replace the ABS actuator and electric
unit (control unit) assem-bly.CAUTION:The ABS actuator and electric
unit (control unit) cannot be disassembled and must be replacedas
an assembly.
3. Check the brake pads for excessive wear.POWER SYSTEM TERMINAL
LOOSENESS AND BATTERY INSPECTIONMake sure the battery positive
cable, negative cable and ground connection are not loose. In
addition, makesure the battery is sufficiently charged.ABS WARNING
LAMP AND SLIP INDICATOR LAMP INSPECTION1. Make sure ABS warning
lamp and SLIP indicator lamp turn on for approximately 2 seconds
when the igni-
tion switch is turned ON. If they do not, check CAN
communications. If there are no errors with CAN com-munication
system, check combination meter. Refer to DI-5, "COMBINATION
METERS" .
2. Make sure the lamps turn off approximately 2 seconds after
the ignition switch is turned ON. If the lampsdo not turn off,
conduct self-diagnosis.
3. Make sure ABS warning lamp turns off approximately 2 seconds
after the engine is started. If ABS warn-ing lamp has not turned
off 10 seconds after the engine has been started, conduct
self-diagnosis of theABS actuator and electric unit (control
unit).
4. After conducting the self-diagnosis, be sure to erase the
error memory. Refer to BRC-63, "CONSULT-IIFunction (ABS)" .
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BRC-60
[ABLS/ABS]TROUBLE DIAGNOSIS
Revision: November 2004 2005 Frontier
Warning Lamp and Indicator Timing EFS0053B
X: ON: OFF
Control Unit Input/Output Signal Standard EFS0053CREFERENCE
VALUE FROM CONSULT-IICAUTION:The display shows the control unit
calculation data, so a normal value might be displayed even in
theevent the output circuit (harness) is open or short
circuited.
Condition ABSwarning lamp
SLIPindicator lamp Remarks
When the ignition switch is OFF