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Pinpoint Test Ac: DTC U0256:00

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  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? 
  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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