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Pinpoint Test BG: Abs (Anti-Lock Brake System) Module Communication Concern With HEV (Hybrid Electric Vehicle) Pcm (Powertrain Control Module)

  1. NOTE: The HEVPCM may also be known as the SOBDM or Inverter System Controller (ISC) module.

    Refer to Module Communications Network for schematic and connector information.

    Normal Operation and Fault Conditions 

    With the ignition ON, the HEVPCM sends messages to the ABS module over the FD-CAN. If the ABS module does not receive these messages within the specified time frame, the ABS module sets DTC. This can be due to a HEVPCM failure, a circuit failure on the CAN or an excessive load on the network.

    REFER to: Anti-Lock Brake System (ABS) and Stability Control - Diesel/Flex Fuel - Ethanol/Full Hybrid Electric Vehicle (FHEV)/Gasoline - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    ABS U1026:00 ABS Control Module Lost Communication with Hybrid/EV Powertrain Control Module: No Sub Type Information Sets if the HEVPCM messages are missing.

    Possible Causes 

    • Network communication concern
    • Wiring, terminals or connectors
    • HEVPCM
    • ABS module

  2. BG1 CHECK THE HYBRID PCM (POWERTRAIN CONTROL MODULE) COMMUNICATION

    • Ignition ON.

    • Using a diagnostic scan tool, retrieve the DTC s from all modules.

    Does the hybrid PCM pass the network test? 

    Yes  Diagnose all PCM DTC s. REFER to: Electronic Engine Controls . If there are no DTC s in the PCM GO to  BG2
    No  GO to  BG2

  3. BG2 RECHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE FOR THE LOST COMMUNICATION DTC (DIAGNOSTIC TROUBLE CODE) S

    • Put the ABS module in sleep mode by performing the following steps:

      • With ALL doors closed, set the ignition from ON to OFF.
      • Disconnect the diagnostic scan tool.
      • Open the door, exit the vehicle and close the door.
      • Wait a minimum of 90 seconds for the ABS module to enter sleep mode.

    • Ignition ON.

    • Using a diagnostic scan tool, carry out the ABS self-test.

    Are any of the DTC s listed in the Fault Trigger Conditions Table retrieved again? 

    Yes  GO to  BG3
    No  The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

  4. BG3 REVIEW THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE SELF-TEST FOR VOLTAGE-RELATED DTC (DIAGNOSTIC TROUBLE CODE) S

    • Review the recorded DTC s from the ABS module self-test.

    Is DTC U3003:16 or U3003:17 present? 

    Yes  For DTC U3003:16, GO to Pinpoint Test A For DTC U3003:17, GO to Pinpoint Test F
    No  GO to  BG4

  5. BG4 CHECK FOR HYBRID PCM (POWERTRAIN CONTROL MODULE) DTC (DIAGNOSTIC TROUBLE CODE) S

    • Using a diagnostic scan tool, carry out the SOBDM self-test.

    Are any DTC s present? 

    Yes  DIAGNOSE the SOBDM DTC. REFER to: Electric Powertrain Control .
    No  GO to  BG5

  6. BG5 CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERN

    NOTE: If new modules were installed prior to the DTC being set, the module configuration can be incorrectly set during the PMI or the PMI may not have been carried out.

    • Check the vehicle service history for recent service actions related to the Hybrid PCM or the ABS module. If recent service history is found:

      • Verify the correct replacement module was installed. HVBOM may be used to verify correct part fitment.
      • Verify the configuration of replacement module was correct. Re-configure the module using as-built data if prior configuration is suspect.
      • Verify the module was not obtained from a like vehicle and installed into customer vehicle. Return the swapped module to source vehicle and obtain a new replacement module.

    • Operate the system and determine if the observable symptom is still present.

    Is the observable symptom still present? 

    Yes  GO to  BG6
    No  The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

  7. BG6 CHECK FOR COMMUNICATION DTC (DIAGNOSTIC TROUBLE CODE) S IN OTHER MODULES

    • Ignition ON.

    • Using a diagnostic scan tool, retrieve the DTC s from all modules.

    Is DTC U0293:xx, U0594:xx or U0126:xx set in 1 or more modules in addition to the ABS module? 

    Yes  GO to  BG7
    No  GO to  BG8

  8. BG7 CHECK FOR CORRECT HYBRID PCM (POWERTRAIN CONTROL MODULE) MODULE OPERATION

    NOTE: The hybrid PCM may also be known as the or the Inverter System Controller (ISC) module.

    • Disconnect SOBDM connector if not previously disconnected.

    • Disconnect PCM B connector if not previously disconnected.

    • Disconnect PCM E connector if not previously disconnected.

    • Using a good light source, inspect all disconnected electrical connectors for the following:

      • Corrosion - INSTALL new connector or terminal and clean the module pins
      • Damaged or bent pins - INSTALL new terminals or pins
      • Pushed-out pins - INSTALL new pins as necessary
      • Spread terminals - INSTALL new terminals as necessary

    • Connect SOBDM connector. Make sure the connector seats and latches correctly.

    • Connect PCM E connector. Make sure the connector seats and latches correctly.

    • Connect PCM B connector. Make sure the connector seats and latches correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  For Hybrid Electric Vehicle: : 
    CHECK OASIS for any service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service article exists for this concern,
    INSTALL a new Secondary OBD Control Module A.RVC: 
    Generate RVC only works in single-step view Generate RVC requires VIN entry 
    For all others: : 
    CHECK OASIS for any service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service article exists for this concern,
    INSTALL a new Powertrain Control Module (PCM).RVC: 
    Generate RVC only works in single-step view Generate RVC requires VIN entry 
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

  9. BG8 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION

    • Ignition OFF.

    • Disconnect ABS module connector C135.

    • Using a good light source, inspect the electrical connector for the following:

      • Corrosion - INSTALL new connector or terminal and clean the module pins
      • Damaged or bent pins - INSTALL new terminals or pins
      • Pushed-out pins - INSTALL new pins as necessary
      • Spread terminals - INSTALL new terminals as necessary

    • Connect ABS module connector, C135. Make sure the connector seats and latches correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new EBB module. REFER to: Electric Brake Booster (EBB) .
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
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