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Pinpoint Test U: U0121:87

  1. Normal Operation and Fault Conditions 

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    IPMB U0121:87 Lost Communication With Anti-Lock Brake System (ABS) Control Module "A": Missing Message Sets in continuous memory in the IPMB if it is missing a message from the ABS module for 5 seconds or longer.

    Possible Sources 

    • Communication concern
    • ABS module
    • IPMB

  2. U1 VERIFY THE CUSTOMER CONCERN

    • Verify there is an observable symptom present.

    Is an observable symptom present? 

    Yes  GO to  U2
    No  Clear the DTC. The system is operating normally at this time. The DTC may have been set due to high network traffic, or an intermittent fault condition.

  3. U2 CHECK THE COMMUNICATION NETWORK

    • Using a diagnostic scan tool, carry out the network test.

    Does the ABS module pass the network test? 

    Yes  GO to  U3
    No  Refer to Communications Network .

  4. U3 CARRY OUT THE IPMB (IMAGE PROCESSING MODULE B) CONTROL MODULE SELF-TEST

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

    Are any network Diagnostic Trouble Codes (DTCs) present? 

    Yes  Refer to the Diagnostic Trouble Code (DTC) Chart .
    No  GO to  U4

  5. U4 CARRY OUT THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE SELF-TEST

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

    Are any network Diagnostic Trouble Codes (DTCs) present? 

    Yes  Refer to Anti-Lock Brake System (ABS) and Stability Control .
    No  GO to  U5

  6. U5 RECHECK THE IPMB (IMAGE PROCESSING MODULE B) DIAGNOSTIC TROUBLE CODES (DTCS)

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

    • Ignition OFF.

    • Ignition ON.

    • Wait 10 seconds.

    • Using a diagnostic scan tool, carry out the IPMB continuous memory self-test.

    • Check the IPMB Continuous Memory Diagnostic Trouble Codes (CM DTCs).

    Is DTC U0121:87 present? 

    Yes  GO to  U6
    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.

  7. U6 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 ABS module or IPMB. If recent service history is found:

      • verify correct replacement module was installed

        • vehicle parts build may be used to verify correct part fitment

      • verify the configuration of replacement module was correct

        • re-configure 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

        • if a new replacement module is installed, CARRY OUT PMI using as-built data

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

    Is the observable symptom still present? 

    Yes  GO to  U7
    No  The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

  8. U7 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION

    • Ignition OFF.

    • Disconnect and inspect all ABS module connectors.

    • Repair:

      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary

    • Reconnect the ABS module connectors. Make sure they seat and latch correctly.

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

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable 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 ABS module. Refer to Anti-Lock Brake System (ABS) Module - Vehicles With: Vacuum Brake Booster .
    No  The system is operating correctly at this time. 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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