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Pinpoint Test Ac: DTC U0256:00

WARNING: This page is about a different car, the 2014 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
  1. AC1 VERIFY THE CUSTOMER CONCERN 
    • Ignition ON.
    • Verify there is an observable symptom present.

    Is an observable symptom present? 

    • Yes  : GO to AC2  .
    • 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. AC2 CHECK THE COMMUNICATION NETWORK 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Network Test.
    • Carry out the network test.

    Does the FCIM pass the network test? 

  3. AC3 RETRIEVE THE RECORDED DTCs FROM THE FCIM SELF-TEST 
    • Check for recorded DTCs from the FCIM  self-test.

    Is DTC U3003:16 or DTC U3003:17 recorded? 

    • Yes  : Refer to the appropriate article for the procedure.
    • No  : GO to AC4  .
  4. AC4 RETRIEVE THE RECORDED DTCs FROM THE HVAC MODULE SELF-TEST 
    • Check for recorded DTCs from the HVAC module self-test.

    Is DTC U3003:16 or DTC U3003:17 recorded? 

  5. AC5 RECHECK THE HVAC MODULE DTCs 
    NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during the PMI  or the PMI  may not have been carried out.
    • Clear the DTCs.
    • Wait 10 seconds.
    • Repeat the HVAC module self-test.

    Is DTC U0256:00 still present? 

    • Yes  : GO to AC6  .
    • 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. AC6 CHECK FOR DTC U0256:00 SET IN OTHER MODULES 
    • Clear all DTCs.
    • Ignition OFF.
    • Wait 10 seconds.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Self-Test.
    • Retrieve the continuous memory DTCs from all modules.

    Is DTC U0256:00 set in the APIM ? 

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