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Inspection and Verification: Notes

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If a new anti-lock brake system (ABS) module is installed, it must be configured. If equipped with stability assist, the ABS module must also be calibrated. Follow the diagnostic tool directions.
  1. Verify the customer concern.
  2. Verify the stoplamps operate correctly by pressing and releasing the brake pedal with the ignition switch in the OFF position. If the stoplamps do not operate correctly, refer to EXTERIOR LIGHTING . If the stoplamps operate correctly, proceed to the next step.
  3. Verify that the PRNDL operates correctly on the instrument cluster. If the PRNDL does not operate correctly, refer to AUTOMATIC TRANSMISSION - 5R55S . If the PRNDL operates correctly, proceed to the next step.
  4. Visually inspect for obvious signs mechanical or electrical damage:

    Visual Inspection Chart 

    VISUAL INSPECTION CHART

    Mechanical Electrical
    • Wheel speed sensor ring
    • Hydraulic control unit (HCU)
    • Base brake system
    • Brake booster vacuum hose
    • Ford specified steering components, suspension components and tire size
    • Battery junction box (BJB) fuse(s):
      • 5(40A)
      • 10 (30A)
      • 25 (15A)
    • Central junction box (CJB) fuses:
      • 22 (10A)
      • 26 (7.5A)
    • ABS module
    • Wheel speed sensor
    • Stability assist switch
    • Brake pedal position (BPP) switch
    • Steering wheel rotation sensor
    • Brake booster solenoid
    • Brake booster release switch
    • Brake pressure transducer
    • Brake pedal travel sensor
    • Sensor cluster (also called accelerometer)
    • Brake pedal relay
    • Brake fluid level switch
    • Circuitry
  5. If the cause is not visually evident, connect the diagnostic tool to the data link connector and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
    • check that the program card is correctly installed.
    • check the connections to the vehicle.
    • check the ignition switch position.
  6. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
    NOTE: If equipped with stability assist, the vehicle must be at a complete standstill when carrying out the self-test. Any movement of the vehicle during the self-test may result in false DTCs being set.
  7. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
    • CAN, ISO or UBP circuit fault; all electronic control units no response/not equipped, refer to MODULE COMMUNICATIONS NETWORK .
    • No response/not equipped for the ABS module, Go To PINPOINT TEST A .
    • System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the ABS module.
  8. If the DTCs retrieved are related to the concern, go to the ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX  to continue diagnostics.
  9. If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART  to continue diagnostics.
NOTE: The need to recalibrate the module is indicated by the active/fail lamp flashing. There are other service actions that can require recalibration when there is no flashing lamp. The lamp will flash after clearing the DTCs that are indicated in the ABS module calibration list.
NOTE: Always retrieve the continuous DTCs after running the self-test.
NOTE: For a complete master list of DTCs, refer to MODULE COMMUNICATIONS NETWORK .
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