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Pinpoint Test Aa: DTC P185C: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.
NOTE: Make sure the battery is fully charged before performing this pinpoint test.
  1. AA1 OPERATE THE ELD INDICATOR USING THE TCCM REAR LOCKING DIFF LAMP OUTPUT CONTROL OPTIONAL (DIFF_LAMP_OS) PID 
    • Enter the following diagnostic mode on the scan tool: Data Logger - TCCM  .
    • Command the DIFF_LAMP_OS PID on.

    Does the ELD indicator in the MSS illuminate? 

    • Yes  : GO to  AA5.
    • No  : GO to AA2  .
  2. AA2 CHECK THE ELD INDICATOR CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: TCCM C2371A  .
    • Disconnect: MSS  .
    • Ignition ON.
    • Measure the voltage between TCCM C2371A-20  , circuit CCF33 (GY/YE), harness side and ground.
      Fig 1: Measuring Voltage Between TCCM C2371A-20, Circuit CCF33 (GY/YE) And Ground
      G06171675Courtesy of FORD MOTOR CO.

    Is any voltage present? 

    • Yes  : REPAIR circuit CCF33 (GY/YE). CLEAR the DTCs. TEST the system for normal operation.
    • No  : GO to AA3  .
  3. AA3 CHECK FOR VOLTAGE TO THE MSS 
    • Measure and record the battery voltage at the battery.
      Fig 2: Checking Charging System Voltage
      G06544266Courtesy of FORD MOTOR CO.
    • Measure the voltage between MSS C284-7  , circuit CBP34 (VT/BN), harness side and ground.
      Fig 3: Measuring Voltage Between MSS C284-7 And Ground
      G06171677Courtesy of FORD MOTOR CO.

    Does the voltage equal the recorded battery voltage? 

    • Yes  : GO to AA4  .
    • No  : VERIFY BCM  fuse 34 (10A) is OK. If OK, REPAIR circuit CBP34 (VT/BN). If not OK, REFER to the OEM WIRING DIAGRAMS to identify the possible causes of the circuit short. CLEAR the DTCs. TEST the system for normal operation.
  4. AA4 CHECK THE TCCM GROUND CIRCUIT 
    • Ignition OFF.
    • Disconnect: TCCM C2371B  .
    • Measure the resistance between C2371B-3  , circuit GD123 (BK/GY), harness side and ground.
      Fig 4: Measuring Resistance Between C2371B-3, Circuit GD123 (BK/GY) And Ground
      G06171678Courtesy of FORD MOTOR CO.

    Is the resistance less than 3 ohms? 

    • Yes  : GO to AA5  .
    • No  : REPAIR circuit GD123 (BK/GY). CLEAR the DTCs. TEST the system for normal operation.
  5. AA5 CHECK FOR CORRECT TCCM OPERATION 
    • Ignition OFF.
    • Disconnect and inspect all TCCM  connectors.
    • Repair:
      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary
    • Connect all TCCM  connectors. Make sure they are seated correctly.
    • Operate the system and verify the concern is still present.

    Is the concern still present? 

    • Yes  : INSTALL a new TCCM  . REFER to TRANSFER CASE CONTROL MODULE (TCCM) . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. ADDRESS the root cause of the connector or pin issues.
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