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Pinpoint Test J: DTC U0155:00

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  1. J1 VERIFY THE CUSTOMER CONCERN 
    • Ignition ON.
    • Verify that there is an observable symptom present.
    • Is an observable symptom present? 
    • Yes  : GO to J2  .
    • No  : The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
  2. J2 CHECK THE COMMUNICATION NETWORK 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Network Test.
    • Carry out the network test.
    • Does the IPC pass the network test? 
  3. J3 RECHECK THE SOD-R OR THE SOD-L DTCs 
    • Clear the DTCs. Repeat the SOD-R or the SOD-L self-test.
    • Is DTC U0155:00 still present? 
    • Yes  : GO to J4  .
    • 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.
  4. J4 CHECK FOR LOST COMMUNICATION DTCs 
    • Ignition ON.
    • Clear continuous DTCs from all modules.
    • Ignition OFF.
    • Ignition ON.
    • Wait at least 10 seconds.
    • Retrieve all continuous DTCs from all modules.
    • Is DTC U0155:00 set in any module? 
    • Yes  : GO to J5  .
    • No  : The system is operating correctly at this time. The DTC may have been set due to an intermittent fault in the network wiring.
  5. J5 CHECK FOR CORRECT IPC OPERATION 
    • Disconnect the IPC connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the IPC connector and make sure it seats correctly.
    • Is the concern still present? 
    • Yes  : INSTALL a new IPC. REFER to INSTRUMENTATION, MESSAGE CENTER & WARNING CHIMES -- FUSION, MILAN & MKZ article. CLEAR all continuous DTCs. TEST the system for normal operation.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR all continuous DTCs. REPEAT the self-test for the module(s) that set DTC U0155:00.
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