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Home >> Ford >> 2015 >> Explorer Limited, 3.5L Eng VIN 8, AWD >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> Four Wheel Drive (4WD) Systems >> Diagnosis And Testing >> Four Wheel Drive (4WD) Systems >> Pinpoint Tests >> Pinpoint Test D : P188B >> Pinpoint Test D : P188B

Pinpoint Test D : P188B

  1. D1 CHECK THE ATC SOLENOID AND CONTROL CIRCUITS FOR AN OPEN WITH THE ATC SOLENOID CONNECTED

    • Disconnect: AWD Relay C4379 .
    • Inspect the connectors for damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4379-5
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C4379-8

    Is the resistance between 1 and 5 ohms? 

    Yes  INSTALL a new AWD relay module. REFER to All Wheel Drive (AWD) Relay Module .
    No  If the resistance is less than 1 ohm, repair the circuit for a short to ground. If the resistance is greater than 5 ohms, GO to  D2.

  2. D2 CHECK THE ATC SOLENOID CIRCUITS FOR AN OPEN

    • Disconnect: ATC Solenoid C4347 .
    • Inspect the connector for damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4379-5
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C4347-1
      C4379-8
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C4347-2

    Is the resistance less than 5 ohms? 

    Yes  GO to  D3.
    No  REPAIR the circuit.

  3. D3 CHECK THE ATC SOLENOID CIRCUITS FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4379-5
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4379-8
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  D4.
    No  REPAIR the circuit.

  4. D4 CHECK THE ATC SOLENOID CIRCUITS FOR A SHORT TOGETHER

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4379-5
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C4379-8

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  D5.
    No  REPAIR the circuit.

  5. D5 CHECK THE ATC SOLENOID CIRCUITS FOR A SHORT TO POWER

    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4379-5
      GFD33595Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4379-8
      GFD33595Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  D6.

  6. D6 CHECK THE ATC SOLENOID

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4347-1
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C4347-2

    Is the resistance less than 10 ohms? 

    Yes  INSTALL a new PCM. REFER to Electronic Engine Controls . PROGRAM the PCM with the latest calibration. PERFORM the Solenoid Body Strategy Data Download procedure and PERFORM the Solenoid Body Strategy Drive Cycle, REFER to Automatic Transmission - 6F50/6F55 . PROGRAM the PCM with the ATC solenoid bar code information, REFER to Automatic Torque Coupling (ATC) Configuration . PERFORM the AWD Drive Cycle.
    No  INSTALL a new rear axle. REFER to Rear Drive Axle Differential . PROGRAM the PCM with the ATC solenoid bar code information. REFER to Automatic Torque Coupling (ATC) Configuration . PERFORM the AWD Drive Cycle.
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