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Pinpoint Test Ai : DTC U0155:00

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. AI1 VERIFY THE CUSTOMER'S CONCERN

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

    Is an observable symptom present? 

    Yes  GO to  AI2.
    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. AI2 CHECK THE COMMUNICATION NETWORK

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

    Does the IPC pass the network test? 

    Yes  GO to  AI3.
    No  REFER to Module Communications Network .

  3. AI3 RETRIEVE THE IPC DTCs

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

    Are any non-network DTCs recorded in the IPC ? 

    Yes  GO to  AI4.
    No  REFER to Multifunction Electronic Modules .

  4. AI4 RECHECK FOR DTC U0155:00

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

    Is DTC U0155:00 still set in the APIM, ACM, audio DSP module, FCIM, or audio RCU module? 

    Yes  GO to  AI5.
    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. AI5 RETRIEVE THE RECORDED DTCs FROM THE APIM, ACM, AUDIO DSP MODULE, FCIM, AND AUDIO RCU MODULE SELF-TEST

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

    Are any non-network DTCs recorded? 

    Yes  REFER to the DTC Charts .
    No  GO to  AI6.

  6. AI6 CHECK FOR DTC U0155 SET IN MULTIPLE MODULES

    • Review the CMDTCs from all modules.

    Is DTC U0155:00 or U0155:87 set in more than one module? 

    Yes  GO to  AI7.
    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. AI7 CHECK FOR CORRECT IPC OPERATION

    • Ignition OFF.
    • Disconnect and inspect the IPC 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 IPC 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, refer to IPC 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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