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Function:injection
1 - Double Injection Relay ( 1304 )
the double injection relay is controlled directly by the injection ECU the double injection relay is connected to the injection harness by a 15 way connector(fastening of the connector by clamping bow) it has 3 operating states ignition off:permanent + 12 volt supply to ECU(the supply to the memory and the auto-adaptation of the ECU are preserved) ignition on :
ECU supplied with "+" after ignition the fuel pump is supplied for 2 to 3 secondsafter this time, the supply is cut off if the engine is not started
engine running,components supplied :
injection ECU fuel pump injectors ignition coil canister discharge electrovalve oxygen sensor heating element(downstream oxygen sensor, upstream oxygen sensor)
2 - Vehicle Speed Sensor ( 1620 )
2.1 - Role
the sensor informs the ECU of the speed of the vehicle role of the injection ECU according to the data received :
to work out the vehicle speed to work out the ratio of the gear engaged to improve idling speed when the vehicle is moving to optimise acceleration to reduce engine hesitation
2.2 - Description
"Hall effect" sensor :
5 impulses per metre 8 impulses per revolution
2.3 - Electrical Features
allocation of the connector channels :
channel 1:+ 12 volts supply(double injection relay) channel 2:earth channel 3:signal
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2.4 - Location
the sensor in located in the gearbox
3 - Engine Speed Sensor(1313)
3.1 - Role
the sensor is located opposite the teeth of the flywheel role of the injection ECU according to the data received :
checking the engine speed to determine the position of the crankshaft calculation of ignition advance to regulate the idle speed
3.2 - Description
the sensor is of the inductive type components of the sensor :
a permanent magnet an electric winding
the sensor provides an electrical signal every time a tooth on the flywheel passes by (change in magnetic field) the 58 teeth are used to work out the engine speed the 2 missing teeth are used to work out the crankshaft position (no signal)
3.3 - Electrical Features
allocation of the connector channels :
channel 1:signal channel 2:earth channel 3:screening(*)
(*)according to version resistance between channels 1 and 2:425 to 525 Ω features of the signals emitted:variable frequency alternating voltage
3.4 - Location
location:on the clutch housing
4 - The Camshaft Position Sensor ( 1115 )
4.1 - Role
role of the injection ECU according to the data received :
NOTE
the air gap is not adjustable
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to synchronise fuel injections with respect to the position of the pistons to recognise top dead centres to determine misfires
4.2 - Description
"Hall effect" sensor the camshaft sensor provides a square signal for the injection ECU
4.3 - Electrical Features
allocation of the connector channels :
channel 1:+ 5 volts supply channel 2:signal channel 3:earth
the voltage slots are between 0 and 5 volts signal emitted :
presence of metal earth opposite the sensor:0 volt absence of metal earth opposite the sensor:5 volts
4.4 - Location
location:on the cylinder head,opposite a target driven by the camshaft
5 - Engine Coolant Temperature Sensor(1220)
5.1 - Role
the engine coolant temperature sensor informs the ECU about the engine coolant temperature role of the injection ECU according to the data received :
to adjust the starting flow to adjust the idle speed to obtain an accelerated idle speed which decreases as the engine heats up
5.2 - Description
the sensor consists of a CTN -type resistor(negative temperature coefficient resistance) the more the temperature increases, the more its resistance value is reduced
5.3 - Electrical Features
air and fuel supply:injection ECU allocation of the connector channels :
channel 1:+ 5 volts supply channel 2:signal
electrical specifications :
resistance at 20 C=6250 ohms
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resistance at 80 C=600 ohms
6 - Air Temperature Sensor(1310)
6.1 - Role
the air temperature sensor informs the ECU about the temperature of the air taken in role of the injection ECU according to the data received :
to calculate the density of the ambient air to work out the amount of fuel to inject
6.2 - Description
the sensor consists of a Negative Temperature Coefficient (NTC) resistor the more the temperature increases, the more its resistance value is reduced
6.3 - Electrical Features
electrical specifications :
resistance at 20 C=6250 ohms resistance at 80 C=600 ohms
7 - Knock Sensor ( 1120 )
7.1 - Role
the engine knock information, transmitted by the sensor, enables the ECU to correct the ignition advance(reduction) knock is a vibratory phenomenon due to an exploding combustion of the air/fuel mixture in one of the 4 cylinders the sensor transmits voltage peaks to the injection ECU when there is knocking after engine knocking information, the ECU reduces the ignition timing, and simultaneously enriches the air-fuel mixture
7.2 - Electrical Features
air and fuel supply:injection ECU allocation of the connector channels :
channel 1:+ 5 volts supply channel 2:signal channel 3:screening(*)
(*)according to version
7.3 - Location
location:cylinder block
8 - Upstream Oxygen Sensor(1350)
8.1 - Role
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location:the oxygen sensor is located in the exhaust line, between the engine and the catalytic converter these hydrocarbons alter the state of the reference air in the sensor and therefore the mixture signal accuracy role of the injection ECU according to the data received :
to determine the fuel / air mixture (richness) richness adjustment
8.2 - Description
the oxygen sensor informs almost continuously the ECU about the air-fuel mixture ratio the "rich" or "weak" mixture information is given by 0 to 1 V voltages :
weak mixture=0,1 V rich mixture=0,9 V
a heating device placed inside the sensor enables it to rapidly reach its operating temperature( + 300 C)
8.3 - Electrical Features
the sensor is equipped with a 4 way caliper connector allocation of the connector channels :
channel 1:+ 12 volts supply(oxygen sensor heater) channel 2:earth channel 3:+ signal channel 4:- signal
9 - Throttle Position Sensor(1316)
9.1 - Role
the throttle potentiometer informs the injection ECU on the position of the fuel throttle the information supplied by this unit is used to :
identify the position of "no throttle" or "full throttle" determine the strategies of acceleration, deceleration and injection cut-off inform the automatic gearbox ECU(*)
(*)according to version
9.2 - Features Of The Automatic Gearbox
the injection ECU sends the position of the fuel throttle to inform the gearbox ECU of the engine load the throttle potentiometer is also used to perform the "kick-down" function(no tight spot)
9.3 - Electrical Features
air and fuel supply:injection ECU allocation of the connector channels :
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channel 1:earth channel 2:+ 5 volts supply channel 3:signal
the voltage signal delivered to the ECU by this unit varies from 0 to 5 V according to the position of the throttle
10 - Power-Assisted Steering Pressure Switch(7001)
10.1 - Role
the steering pressure switch allows the engine ECU to increase the engine idling speed when parking conditions for increasing the idling speed :
vehicle speed lower than 4 kph pressure switch activated(power-assisted steering)
10.2 - Location
on the union between the power assisted steering valve and pump
11 - Injection ECU(1320)
11.1 - Role
the ECU controls the ignition and the injection depending on the various parameters received these parameters are :
the engine speed and the crankshaft position(TDC sensor - camshaft position sensor) the inlet air pressure(pressure sensor) the throttle position(throttle potentiometer) the engine temperature(coolant thermistor) the temperature of the air drawn into the cylinders(air temperature sensor) the speed of the vehicle(vehicle speed sensor) the oxygen content of exhaust gases(oxygen sensor) the pinking(knock sensor) the air conditioning demand the battery voltage the pressure in the power assisted steering circuit automatic gearbox ECU
by making use of the information, the ECU controls :
the ignition advance and the coil charging time adjustment of idling speed:engine temperature,battery voltage,parking,automatic gearbox and air conditioning
the amount of fuel injected, proportional to the injector opening time the idling speed regulation the fuel pump the fuel vapour recycling(canister bleed electrovalve) the injection cut-off on overspeed and deceleration the air conditioning cut-off
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the trip computer(instant consumption) the tachometer diagnostic warning lamp the oxygen sensor heating element(downstream oxygen sensor, upstream oxygen sensor) the secondary air pump(air injection into the exhaust function) the exhaust gas recycling valve the automatic gearbox ECU:throttle potentiometer connection,engine speed,coolant temperature,engine torque
the ECU also controls the following functions :
emergency strategies the diagnostic with memorisation of failuresusing a diagnostic tool
11.2 - Allocation Of The Connector Channels
index :
" a ":connector CLM2 " b ":connector CLC " c ":connector CLM1
special features :
new connector system locking of the connectors with plastic clips marking of the ECU channels:alphanumeric characters
channel number allocation of channels
A1 (not used)
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A2 input:exterior air temperature information
A2 earth
A3 earth
A4 after ignition +12 volts(main supply)
B1 (not used)
B2 (not used)
B3 input:( - ) signal for knock sensor
B4 input:throttle position information ( + )
C1 (not used)
C2 (not used)
C3 input:( + ) signal for knock sensor
C4 input:alternator charge
D1 (not used)
D2 output:oxygen sensor heating(downstream)
D3 input:oxygen sensor signal ( - )(downstream)
D4 input:engine coolant temperature sensor
E1 (not used)
E2 (not used)
E3 input: oxygen sensor signal ( + )(downstream)
E4 input:engine coolant temperature information(coolant temperature sensor)
F1 (not used)
F2 output:double injection relay control
F3 input:camshaft sensor signal
F4 input:exhaust gas recycling valve position signal
G1 (not used)
G2 (not used)
G3 output:double coil control (cylinders 1 - 4 )
G4 output:exhaust gas recycling valve control
H1 (not used)
H2 (not used)
H3 output:double coil control (cylinders 2 - 3 )
H4 earth
channel number allocation of channels
A1 (not used)
A3 input:oxygen sensor richness information ( + )(upstream)
A4 (not used)
B1 input:( + ) signal for speed and position sensor
B2 input:( - ) signal for speed and position sensor
B3 input:oxygen sensor signal ( - )(upstream)
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B4 (not used)
C1 input:inlet manifold air pressure(+)
C2 input:inlet manifold air pressure(-)
C3 + 5 volts supply(sensors)
C4 (not used)
D1 output:stepper motor control
D2 output:stepper motor control
D3 output:stepper motor control
D4 (not used)
E1 + 5 volts supply(sensors)
E2 (not used)
E3 output:stepper motor control
E4 (not used)
F1 (not used)
F2 output: canister bleed valve control
F3 output:double injection relay
F4 (not used)
G1 (not used)
G2 output:control of injector N 3(earth)
G3 output:control of injector N 2(earth)
G4 (not used)
H1 earth
H2 output: control of injector N 1(earth)
H3 output:control of injector N 4(earth)
H4 (not used)
channel number allocation of channels
A1 (not used)
A2 (not used)
A3 (not used)
A4 (not used)
B1 (not used)
B3 diagnostic line l
B4 ignition on information
C1 (not used)
C2 output:fuel consumption at any moment(trip computer)
C3 output:refrigeration compressor operation relay control
C4 output:diagnostic warning lamp(earth)
D1 (not used)
D2 output:canister bleed valve control
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D3 input:air conditioning demand information(by a temperature of AC-TH )
D4 (not used)
E1 (not used)
E2 input:forcing fan unit to fast speed
E2 input:GMV operated at fast speed(BSI)
E3 input:power-assisted steering pressure switch
E4 (not used)
F1 (not used)
F2 input:fan unit diagnostic
F3 engine immobiliser dialogue line(transponder)
F4 input:wake up for injection ECU, wake up for ADC
G1 (not used)
G2 input:vehicle speed
G3 (not used)
G4 (not used)
H1 (not used)
H2 diagnostic line k
H3 (not used)
H4 (not used)
J1 (not used)
J2 output:engine speed
J3 output:engine coolant temperature
J4 output:fan unit 1 control
K1 (not used)
K2 (not used)
K3 output:coolant temperature warning
K4 output: fan unit 2 control
L1 (not used)
L2 (not used)
L3 (not used)
L4 earth
M1 (not used)
M2 output:earth control of the air injection to exhaust pump relay
M3 input:low fuel level
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