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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 
  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 Programmable Module Installation (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.
    • Ignition ON.
    • Wait 10 seconds.
    • 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 Accessory Protocol Interface Module (APIM)? 
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