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Pinpoint Test AE: DTC U0140 Or DTC U0140:00

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  1. AE1 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 U0140 or DTC U0140:00 set in any audio system module? 
    • Yes  : GO to  AE2.
    • No  : The system is operating correctly at this time. The DTC may have been set due to an intermittent fault in the network wiring.
  2. AE2 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs 
    • Carry out the self-test for the following modules:
      • ACM 
      • Audio DSP  module (if equipped)
      • APIM  (if equipped)
      • FCIM 
      • FDIM 
      • GPSM  (if equipped)
      • SJB 
    • Is DTC B1317, B1318, U3003:16, or U3003:17 recorded in any module? 
  3. AE3 CHECK FOR DTC U0140 OR DTC U0140:00 SET IN MULTIPLE MODULES 
    • Review the recorded results from the self-test.
    • Is DTC U0140 or DTC U0140:00 set in more than one audio system module? 
    • Yes  : GO to  AE4.
    • No  : If there is an observable symptom, GO to SYMPTOM TABLE - GENERAL AUDIO SYSTEM  to diagnose the observed symptom.

      If there is no observable symptom, CHECK the MS-CAN  wiring between the SJB  and the module in question for an intermittent fault.

  4. AE4 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all the SJB  connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the SJB  connectors and make sure they seat correctly.
    • Is the concern still present? 
    • Yes  : INSTALL a new SJB  . REFER to MULTIFUNCTION ELECTRONIC MODULES . 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 U0140 or DTC U0140:00.
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