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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 E : P188C, P188D >> Pinpoint Test E : P188C, P188D

Pinpoint Test E : P188C, P188D

  1. E1 CHECK FOR AWD RELAY VOLTAGE

    • Ignition OFF.
    • Disconnect: AWD Relay C4379 .
    • Inspect the connectors for damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals.
    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4379-1
      GFD33595Courtesy of FORD MOTOR COMPANY
      		 C4379-4

    Is the voltage greater than 10 volts? 

    Yes  GO to  E4.
    No  GO to  E2.

  2. E2 CHECK FUSE 70 (15A)

    • Ignition OFF.
    • Remove fuse 70 (15A).
    • Check fuse 70 (15A).

    Is the resistance less than 5 ohms? 

    Yes  GO to  E3.
    No  REPAIR the circuit.

  3. E3 CHECK THE AWD RELAY POWER CIRCUIT FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4379-1
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Fuse 70 Refer to OEM FUSE AND RELAY INFORMATION for schematic and connector information.

    Is the resistance less than 5 ohms? 

    Yes  GO to  E4.
    No  REPAIR the circuit.

  4. E4 CHECK THE AWD RELAY GROUND CIRCUIT FOR AN OPEN

    • Install fuse 70 (15A)
    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4379-1
      GFD33595Courtesy of FORD MOTOR COMPANY
      		 C4379-4

    Is the voltage greater than 10 volts? 

    Yes  For 3.5L Ti-VCT GO to  E5. For 3.5L GTDI GO to  E6.
    No  REPAIR the circuit.

  5. E5 CHECK THE AWD RELAY COMMAND AND FEEDBACK CIRCUITS FOR AN OPEN

    • Ignition OFF.
    • Disconnect: PCM C175B (3.5L Ti-VCT).
    • Inspect the connector for damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4379-3
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C175B-54
      C4379-6
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C175B-3

    Is the resistance less than 5 ohms? 

    Yes  GO to  E7.
    No  REPAIR the circuit.

  6. E6 CHECK THE AWD RELAY COMMAND AND FEEDBACK CIRCUITS FOR AN OPEN

    • Ignition OFF.
    • Disconnect: PCM C1381B (3.5L GTDI).
    • Inspect the connector for damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals.
    • Measure the resistance  between.
      Positive Lead Measurement / Action Negative Lead
      C4379-3
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C1551B-60
      C4379-6
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C1551B-46

    Is the resistance less than 5 ohms? 

    Yes  GO to  E7.
    No  REPAIR the circuit.

  7. E7 CHECK THE AWD RELAY COMMAND AND FEEDBACK CIRCUITS FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4379-3
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4379-6
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  E8.
    No  REPAIR the circuit.

  8. E8 CHECK THE AWD RELAY COMMAND AND FEEDBACK CIRCUITS FOR A SHORT TOGETHER

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4379-3
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C4379-6

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  E9.
    No  REPAIR the circuit.

  9. E9 CHECK THE AWD RELAY COMMAND AND FEEDBACK CIRCUITS FOR A SHORT TO POWER

    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4379-3
      GFD33595Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4379-6
      GFD33595Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  INSTALL a new AWD relay module. REFER to All Wheel Drive (AWD) Relay Module . PERFORM the self-test. If DTC P188C and/or P188D return, 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.
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