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Pinpoint Test BB: DTC U0140

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. BB1 VERIFY THE CUSTOMER CONCERN 
    • Ignition ON.
    • Verify that there is an observable symptom present.
    • Is an observable symptom present? 
    • Yes:  GO to BB2  .
    • 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. BB2 CHECK THE COMMUNICATION NETWORK 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Network Test.
    • Carry out the network test.
    • Does the SJB pass the network test? 
  3. BB3 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST 
    • Check for recorded IC  DTCs from the self-test.
    • Is DTC B1317 or DTC B1318 recorded? 
  4. BB4 RECHECK THE IC DTCs 
    • Clear the DTCs. Repeat the IC  self-test.
    • Is DTC U0140 still present? 
    • Yes:  GO to BB5  .
    • No:  The system is operating correctly at this time. The DTC may have been set due to high network traffic.
  5. BB5 CHECK FOR DTC U0140 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 U0140 set in the Audio Control Module (ACM) or HVAC module? 
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