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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 C : P187B >> Pinpoint Test C : P187B

Pinpoint Test C : P187B

    WARNING: When directed to drive the vehicle as part of this test, drive the vehicle on a hard surface in an area without traffic to prevent a crash. Failure to follow these instructions may result in personal injury.

  2. C1 CHECK FOR RECENT TIRE USAGE

    • Check with customer about recent tire usage or installation.

    Was a tire recently installed on the vehicle that was not originally supplied with the vehicle or has the mini spare been used? 

    Yes  Tire size should not exceed OEM recommendations and all 4 tires should be the same size and brand. ROAD TEST the vehicle.
    No  GO to  C2.

  3. C2 CHECK TIRE SIZE AND BRAND

    • Check the tire size and brand.

    Are all 4 tires the same size and brand? 

    Yes  GO to  C3.
    No  Tire size should not exceed OEM recommendations and all 4 tires should be the same size and brand. INSTALL new tire(s) as necessary. ROAD TEST the vehicle.

  4. C3 CHECK TIRE AIR PRESSURES

    • Check the air pressure in all 4 tires.

    Are all 4 tires at the recommended air pressure? 

    Yes  GO to  C4.
    No  ADJUST tire air pressures. ROAD TEST the vehicle.

  5. C4 CHECK ABS MODULE WHEEL SPEED SENSORS

    • Connect the scan tool.
    • Drive the vehicle at 48 km/h (30 mph), monitor the following wheel speed sensor PIDs:
      • Left Front Wheel Speed Sensor (LF_WSPD)
      • Left Rear Wheel Speed Sensor (LR_WSPD)
      • Right Front Wheel Speed Sensor (RF_WSPD)
      • Right Rear Wheel Speed Sensor (RR_WSPD)

    Are all 4 wheel speeds within 2 km/h (1.2 mph) of each other? 

    Yes  GO to  C5.
    No  The ABS module is sending invalid wheel speed data to the PCM, REFER to Anti-Lock Brake System (ABS) and Stability Control .

  6. C5 CHECK FOR CORRECT PCM OPERATION

    • Disconnect: PCM C175B (3.5L Ti-VCT).
    • Inspect the connector for damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals.
    • Disconnect: PCM C1551B (3.5L GTDI).
    • Inspect the connectors for damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals.
    • Connect: PCM C175B (3.5L Ti-VCT).
    • Connect: PCM C1551B (3.5L GTDI).
    • Ignition ON.
    • ROAD TEST the vehicle.
    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    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 bar code information, REFER to Automatic Torque Coupling (ATC) Configuration . PERFORM the AWD Drive Cycle.
    No  The system is operating correctly at this time. ROAD TEST the vehicle and PERFORM the AWD Drive Cycle.
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