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VOLVO CARS
SERVICE AND PARTS BUSINESS
Technical JournalTITLE:
Voltage Regulator replacement recommended instead of alternator replacement
REF NO:
TJ 26897
ISSUING DEPARTMENT:
Technical Service
CAR MARKET:
United States and Canada
PARTNER:
3 US 7510 Volvo Cars North America
ISSUE DATE:
YEAR MONTH DAY
2014 01 10FUNC GROUP:
3211FUNC DESC:
alternator, complete Page 1 of 3
Produced in the USA and available as an electronic document. Hard copy documents are printed in USA on recycled paper containing a minimum of 50% wastepaper and 10% post-consumer waste.
Rows beginning with * are modified Note! If using a printed copy of this Technical Journal, first check for the latest online version.
Text
Update: Alternators are being removed from the Prior Approval process as of January 13th, 2013.
DESCRIPTION:The majority of replaced alternators have had no faults with the alternator itself. As stated in VIDA, replacing only the voltage regulator (ACM, Alternator Control Module) is the recommended repair for an alternator that is not charging correctly.
Additional fault tracing information:Charging voltage: Normal charging voltage can vary depending on many factors such as battery state of charge, battery temperature, electrical loads, etc… The normal range is 13.5-14.8V with an average of 14.2V. In VIDA, “Quick test of alternator function” can be found in Fault tracing->Symptom Related Diagnostic Procedures->372.
2014-01-10 Page 3 of 3
Technical Journal 26897
Voltage drop:The total charging system voltage drop should be less than 0.7V. This is a sum of two measurements:
• Voltage drop from the alternator housing to the negative battery post.• Voltage drop from the alternator B+ terminal to the positive battery post.
LIN (Local Interconnect Network):
• The normal LIN voltage is 7-11V.• Voltage will be high (close to battery voltage) if the ciruit is open.• Voltage will be low (close to 0) if the circuit is shorted to ground.• FurtherLINinformationcanbefoundinVIDA:Information->ProductSpecifications->Design
and Function->37 Cables and fuses->LIN – Local Interconnect Network• Detailed LIN information including the attached tip sheet is found in Volvo Cars Performance
Academy Course 1367 - LIN Diagnostics
DTCs:One or more of the above DTCs may be set when there is a fault in the charging system.
Slip-ring inspection:When the ACM is removed from the alternator, the slip-rings should be visibly inspected for wear.
Light wear and polishing is acceptable. Heavy wear and deep scoring (see attached) indicates that the entire alternator should be replaced.
Noise:Noise is not necessarily caused by the alternator bearings; it may be due to the alternator pulley (one-way clutch).
VOLVO STANDARD TIMES GUIDE (VSTG) INFO:Operation number 32205 - Charge regulator replace - See VSTG
To view TJ attachments continue to next page. This TJ has 4 attachments.
Page 1 Issued: 12/10/10
LIN DIagNostIcs tIp sheet
LocaL Interconnect network (LIn) DIagnostIcsThis Tip sheeT is designed To help you:• Identify master and slave module hierarchy
• Recall fault analysis steps for various LIN-related fault issues
• Locate the path in VIdA for LIN diagnostic instructions
• Locate the path in diCe for calibration and fault checking
Note: The information in this tip sheet is meant to be used as a guide. Any fault analysis or diagnostics should be performed following the proper service procedures and/or wiring diagrams for the vehicle being diagnosed.
paM 4/86 Park Assist Camera (PAC) Cars with Park Assist Camera
pDM 3/127Right Camera Module (RCM) Cars with BLIs
Right Rear door Module (RdM)
tcM 4/28 Gear selector Module (GsM)
Page 4 Issued: 12/10/10
LIN DIagNostIcs tIp sheet
FaulT CondiTions and analysisFault conditions you may encounter include short to ground, short to power, slave node does not communicate, and no LIN slave functionality.
short to ground: With a short to ground fault, no LIN communication is possible. To analyze a short to ground:
1. Familiarize yourself with the LIN bus you are working on by reviewing the components listed in the wiring diagram and VIdA.
2. Find the wire for the LIN bus communication and monitor the voltage. If the voltage is 0V, then the communication wire is shorted to ground.
3. If the voltage is found to be 0V, disconnect the nodes one at a time and note the voltage. If the voltage changes from 0V, then that node should be
investigated for the root cause.
4. If all of the slave nodes are disconnected and the voltage still remains at 0V, then the issue is with the wiring or the master node. The wiring must be
inspected for a short to ground.
5. If the wiring is found to be fault free, the master node can be diagnosed using the breakout box with the LIN harness disconnected.
slave Node Does Not communicate: To analyze a slave node does not communicate fault:
1. Check that the fault code is still present.
2. Check for power and ground at the slave node in question.
3. Check communication wire for proper voltage. ubat is short to power; ulow is short to ground. You should observe 7 – 9V when using a dVOM or a
digital signal oscillating between ubat and ulow if using the Vantage Pro (mandatory tool).
4. If the wiring all checks out, then the issue lies within the component and the component should be replaced.
No LIN slave Node Functionality: To analyze a no LIN slave node functionality fault:
Check CarConfig via the details screen in VIdA to determine if the slave node has been added to the vehicle in error. If the node has been physically added
but the CarConfig has not been updated, then the function will not operate.
ensure that the accessory node has been properly installed using the correct software.
vIDa InforMatIon on LIn DesIgn anD functIonFollow this path in VIdA for detailed information on LIN design and function:
1. Information
2. Product specifications
3. design and Function
4. 3 electrical system
5. 37 Cables and fuses
6. LIN – Local Interconnect Network
under LIN – Local Interconnect Network, there are five subcategories:
• Control modules that communicate via LIN
• error management in the Local Interconnect Network (LIN)