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Pinpoint Test Ar : DTC U0257:00

WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

  1. AR1 VERIFY THE CUSTOMER'S CONCERN

    • Ignition ON.
    • Verify if there is an observable symptom present.

    Is an observable symptom present? 

    Yes  GO to  AR2.
    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.

  2. AR2 CHECK THE COMMUNICATION NETWORK

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

    Does the APIM pass the network test? 

    Yes  GO to  AR3.
    No  REFER to Module Communications Network .

  3. AR3 RETRIEVE THE APIM DTCs

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

    Are any non-network DTCs recorded in the APIM ? 

    Yes  GO to  AR4.
    No  REFER to the Accessory Protocol Interface Module (APIM) DTC Chart .

  4. AR4 RECHECK FOR DTC U0257:00

    • Using a diagnostic scan tool, clear all CMDTCs.
    • Ignition OFF.
    • Ignition ON.
    • Wait at least 10 seconds.
    • Using a diagnostic scan tool, retrieve the ACM, audio DSP module and FCIM CMDTCs.

    Is DTC U0257:00 still set in the ACM, audio DSP module or FCIM ? 

    Yes  GO to  AR5.
    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. AR5 RETRIEVE THE RECORDED DTCs FROM THE ACM, audio DSP module and FCIM SELF-TEST

    • Using a diagnostic scan tool, perform the self-test for the following modules:
      • ACM
      • FCIM
      • Audio DSP module

    Are any non-network DTCs recorded? 

    Yes  REFER to the DTC Charts .
    No  GO to  AR6.

  6. AR6 CHECK FOR DTC U0257 SET IN MULTIPLE MODULES

    • Review the CMDTCs from all modules.

    Is DTC U0257:00 or U0257:87 set in more than one module? 

    Yes  GO to  AR7.
    No  If there is an observable symptom, REFER to the Symptom Charts  to diagnose the observed symptom.If there is no observable symptom, 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. AR7 CHECK FOR CORRECT APIM OPERATION

    • Ignition OFF.
    • Disconnect and inspect the APIM connector.
    • Repair:
      • Corrosion (clean module pins or install new connectors or terminals)
      • Damaged or bent pins (install new terminals or 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 TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new FCDIM. Refer to APIM Hardware Testing .
    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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