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Home >> Ford >> 2022 >> Transit Connect Titanium, Gas/Ethanol >> Repair and Diagnosis >> External Pages >> Different car >> Section 347 (Rear Drive Axle/Differential - Vehicles With: Ford 9.75 Inch Ring Gear) >> Diagnosis And Testing >> Electronic Locking Differential (ELD) >> Pinpoint Tests >> Pinpoint Test B : DTC P187C:00 And P187D:00 >> Pinpoint Test B : DTC P187C:00 And P187D:00

Pinpoint Test B : DTC P187C:00 And P187D:00

WARNING: This page is about a different car, the 2020 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 carrying out this pinpoint test.

  1. B1 CHECK FOR TCCM DTCS

    • Ignition ON.

    • Set the ELDMSS to OFF.

    • Enter the following diagnostic mode: TCCM Self-Test.

    Are any DTCs present? 

    Yes  For DTC P187C:00, GO to  B4 For DTC P187D:00, GO to  B2 For all other DTCs, REFER to the DTC Chart: TCCM .
    No  VERIFY the customer concern and GO to the Symptom Chart Electronic Locking Differential (ELD) System .

  2. B2 CHECK FOR TCCM DTCS WITH THE ELD FIELD COIL DISCONNECTED

    • Ignition OFF.

    • Disconnect ELD Field Coil C4359.

    • Ignition ON.

    • Set the ELDMSS to OFF.

    • Enter the following diagnostic mode: TCCM Self-Test.

    CLEAR the DTCs. REPEAT the self-test. Does DTC P187D:00 return? 

    Yes  GO to  B3
    No  INSTALL a new ELD field coil. REFER to: Differential Carrier - Vehicles With: Electronic Locking Differential (ELD) . CLEAR the DTCs.

  3. B3 CHECK THE ELD DIFFERENTIAL LOCK CONTROL CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Disconnect TCCM C2371B.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2371B-9
      GFD458048Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  B4
    No  REPAIR the circuit.

  4. B4 CHECK THE ELD DIFFERENTIAL LOCK CONTROL CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect TCCM C2371A.

    • Disconnect ELD Field Coil C4359.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2371B-9
      GFD458048Courtesy of FORD MOTOR COMPANY
      		 C4359-1

    Is the resistance less than 3 ohms? 

    Yes  GO to  B5
    No  REPAIR the circuit.

  5. B5 CHECK FIELD COIL GROUND CIRCUIT

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4359-2
      GFD458048Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  B6
    No  REPAIR the circuit.

  6. B6 CHECK FOR CORRECT TCCM OPERATION

    • Ignition OFF.

    • Disconnect and inspect all TCCM connectors.

    • Check for the following:

      • 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 seat and latch 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) .
    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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