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Home >> Lincoln >> 2019 >> MKZ Base, AWD >> Repair and Diagnosis (Single Page) >> Transmission >> Transmission Control Systems >> Four-Wheel Drive Systems - Vehicles With: Torque Vectoring (Except Hybrid) >> Diagnosis And Testing >> Four-Wheel Drive Systems >> Pinpoint Tests >> Pinpoint Test A : AWD (All-Wheel Drive) System Functional Test >> Pinpoint Test A : AWD (All-Wheel Drive) System Functional Test
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Pinpoint Test A : AWD (All-Wheel Drive) System Functional Test

  1. WARNING: 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. NOTE: Check related modules for Diagnostic Trouble Codes (DTCs). If Diagnostic Trouble Codes (DTCs) are set in other modules, diagnose those Diagnostic Trouble Codes (DTCs) first before continuing.

  3. A1 CHECK ABS WHEEL SPEEDS

    • Using a scan tool, drive the vehicle at 30 mph (48 km/h) and monitor the following wheel speed sensor PIDs:

      • Left Front Wheel Speed Sensor (WHL_SPD_LF)
      • Left Rear Wheel Speed Sensor (WHL_SPD_LR)
      • Right Front Wheel Speed Sensor (WHL_SPD_RF)
      • Right Rear Wheel Speed Sensor (WHL_SPD_RR)

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

    Yes  GO to  A2
    No  CHECK ABS system, REFER to: Anti-Lock Brake System (ABS) and Stability Control .

  4. A2 CHECK VEHICLE ACCELERATION IN A STRAIGHT LINE

    • Perform 3 accelerations from mph (km/h) to 30 mph (48 km/h) in a straight line (1 each with low, medium and full accelerator pedal application).

    Is clutch slip or chattering observed from the rear drivetrain? 

    Yes  GO to Pinpoint Test B 
    No  GO to  A3

  5. A3 CHECK VEHICLE TURNING ABILITY

    • Drive the vehicle in a fully locked turn, on dry pavement, at 5 mph (8 km/h).

    Does the vehicle bind in the turn or resist turning? 

    Yes  GO to Pinpoint Test B 
    No  GO to  A4

  6. A4 CHECK TORQUE AT THE LH REAR WHEEL

    • Using the diagnostic scan tool, enable the clutch hydraulic pump motor. Command AWD_CLT_EBL# ON. Then using AWD_CLT_L_SPT, command the LH clutch solenoid set point to 1400 NM.

    • On dry pavement, drive the vehicle in a fully locked turn at 5 mph (8 km/h).

    Does the vehicle bind in the turn or resist turning? 

    Yes  END the active command. GO to  A5
    No  INSTALL a new rear drive unit. REFER to: Axle Assembly .

  7. A5 CHECK TORQUE AT THE RH REAR WHEEL

    • Using the diagnostic scan tool, enable the clutch hydraulic pump motor, command AWD_CLT_EBL# ON. Using AWD_CLT_R_SPT, command the RH clutch solenoid set point to 1400 NM.

    • On dry pavement, drive the vehicle in a fully locked turn at 5 mph (8 km/h).

    Does the vehicle bind in the turn or resist turning? 

    Yes  The system is operating correctly at this time.
    No  INSTALL a new rear drive unit. REFER to: Axle Assembly .
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