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Pinpoint Test Cm: Abs Module Communication Concern With HEV Pcm

  1. Normal Operation and Fault Conditions 

    The HEVPCM may also be known as the SOBDM or the ICS module.

    With the ignition ON, the SOBDM sends messages to the ABS module over the FD-CAN. If the ABS module does not receive these messages within the allotted time frame or if the messages contain invalid data, the module sets a DTC. This can be due to a SOBDM failure, a circuit failure on the network or an excessive load on the network. For information on the messages sent to the ABS module by the SOBDM, REFER to: Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    ABS U0293:00 Lost Communication With Hybrid/EV Powertrain Control Module 'A': No Sub Type Information This DTC sets when the ABS module does not receive any messages from the SOBDM within the allowed time.
    ABS U0594:00 Invalid Data Received From Hybrid/EV Powertrain Control Module 'A': No Sub Type Information This DTC sets when the ABS module receives invalid data in any of the following SOBDM ; ambient air temperature, AWD status, cruise control status, transmission gear position, selectable drive mode status, and transmission auto park status.
    ABS U0594:64 Invalid Data Received From Hybrid/EV Powertrain Control Module 'A': Signal Plausibility Failure This DTC sets when the ABS module receives invalid data in the SOBDM driven wheel direction message.

    Possible Causes 

    • Network communication concern
    • SOBDM

  2. CM1 CHECK THE HYBRID PCM (POWERTRAIN CONTROL MODULE) COMMUNICATION

    NOTE: They hybrid PCM may also be known as the SOBDM or the ICS module.

    • Ignition ON.

    • Using a diagnostic scan tool, retrieve the DTCs from the vehicle.
      NOTE: DTCs may be displayed from previous diagnostic actions.

    Does the hybrid PCM pass the network test? 

    Yes  RETRIEVE and RECORD all hybrid PCM DTCs. REFER to: Electrified Drivetrain Control . If there are no hybrid PCM DTCs, GO to  CM3
    No  GO to  CM2

  3. CM2 CHECK THE GWM (GATEWAY MODULE A) COMMUNICATION

    • Review the results of the modules communicating on the network from the previous step.

    Did the GWM pass the network test? 

    Yes  DIAGNOSE the hybrid PCM does not communicate with the diagnostic scan tool. REFER to: Controller Area Network (CAN) Module Communications Network .
    No  DIAGNOSE the GWM does not communicate with the diagnostic scan tool. REFER to: Controller Area Network (CAN) Module Communications Network .

  4. CM3 RECHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE FOR THE LOST COMMUNCATION DTC (DIAGNOSTIC TROUBLE CODE)

    • Using a diagnostic scan tool, clear the ABS module Diagnostic Trouble Codes (DTCs).

    • 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.

    • Carry out the ABS self-test.

    Do any of the DTCs listed in the DTC Fault Trigger Conditions table return? 

    Yes  GO to  CM4
    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.

  5. CM4 REVIEW THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE SELF-TEST FOR VOLTAGE-REALTED DTCS

    • Review the recorded DTCs 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  CM5

  6. CM5 CHECK FOR GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)

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

    Are any GWM Diagnostic Trouble Codes (DTCs) present? 

    Yes  DIAGNOSE any GWM DTCs. REFER to: Controller Area Network (CAN) Module Communications Network .
    No  GO to  CM6

  7. CM6 CHECK FOR HYBRID PCM (POWERTRAIN CONTROL MODULE) DTCS

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

    Are any DTCs present? 

    Yes  Diagnose the hybrid PCM DTCs. REFER to: Electrified Drivetrain Control .
    No  GO to  CM7

  8. CM7 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 ABS. 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 new replacement module.

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

    Is the observable symptom still present? 

    Yes  GO to  CM8
    No  The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

  9. CM8 CHECK FOR COMMUNICATION DIAGNOSTIC TROUBLE CODES (DTCS) IN OTHER MODULES

    • Ignition ON.

    • Using a diagnostic scan tool retreve all Diagnostic Trouble Codes (DTCs).

    Is DTC U0293:xx, U0594:xx or U1026:xx set in 1 or more modules in addition to the ABS module? 

    Yes  GO to  CM9
    No  GO to  CM10

  10. CM9 VERIFY HYBRID PCM (POWERTRAIN CONTROL MODULE) OPERATION

    NOTE: They hybrid PCM may also be known as the SOBDM or the ICS module.

    • 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.

    • Disconnect ABS C135

    • 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 ABS C135. Make sure it seats and latches correctly.

    • Connect hybrid PCM C1821A. Make sure it 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 exist, INSTALL a new hybrid PCM REFER to: Powertrain Control Module (PCM) .
    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.

  11. CM10 VERIFY ABS (ANTI-LOCK BRAKE SYSTEM) OPERATION

    • 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.

    • 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 C135. Make sure it 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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