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Pinpoint Test P: U0253:87

WARNING: This page is about a different car, the 2023 Lincoln Nautilus. However, it is still accessible from the selected car via links, so may be relevant.
  1. Refer to MODULE COMMUNICATIONS NETWORK for schematic and connector information.

    Normal Operation and Fault Conditions 

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    BCM U0253:87 Lost Communication With Accessory Protocol Interface Module: Missing Message A continuous memory DTC that sets in the BCM if messages from the APIM through the GWM are missing.

    Possible Sources 

    • Communication network concern
    • Battery voltage concern
    • GWM concern
    • APIM
    • BCM

  2. P1 CHECK THE COMMUNICATION NETWORK

    • Using a diagnostic scan tool, perform a network test.

    Does the APIM pass the network test? 

    Yes  GO to  P2
    No 

  3. P2 CHECK THE BCM (BODY CONTROL MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)

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

    • Wait 10 seconds.

    • Using a diagnostic scan tool, check the BCM Continuous Memory Diagnostic Trouble Codes (CM DTCs).

    Is DTC U3006:16, U3006:17, U3007:16, U3007:17, U3013:16, U3013:17, U3014:16 or U3014:17 recorded? 

    Yes  For DTC U3006:16, U3007:16, U3013:16 or U3014:16, GO to Pinpoint Test U 
    For DTC U3006:17, U3007:17, U3013:17 or U3014:17, GO to Pinpoint Test W 
    No  GO to  P3

  4. P3 RETRIEVE THE APIM (SYNC MODULE) DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE SELF-TEST

    • Using a diagnostic scan tool, perform the APIM self-test.

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to: INFORMATION AND ENTERTAINMENT SYSTEM .
    No  GO to  P3

  5. P4 RECHECK THE BCM (BODY CONTROL MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)

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

    • Wait 10 seconds.

    • Using a diagnostic scan tool, check the BCM Continuous Memory Diagnostic Trouble Codes (CM DTCs).

    Is DTC U0253:87 still present? 

    Yes  GO to  P5
    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.

  6. P5 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0253:87 SET IN OTHER MODULES

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

    • Ignition OFF.

    • Ignition ON.

    • Wait 10 seconds.

    • Using a diagnostic scan tool, retrieve all 

      Continuous Memory Diagnostic Trouble Codes (CM DTCs).

    Is DTC U0253:87 set in other modules? 

    Yes  GO to  P6
    No  GO to  P7

  7. P6 CHECK FOR CORRECT APIM (SYNC MODULE) OPERATION

    • Disconnect and inspect the APIM connector.

    • 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 APIM connector. 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 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, APIM GUIDED ROUTINE
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

  8. P7 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

    • Disconnect and inspect all BCM 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 BCM 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 BCM. REFER to: Body Control Module (BCM)  .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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