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Home >> Ford >> 2012 >> Expedition RWD >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System And Stability Control >> Diagnosis And Testing >> Anti-Lock Control >> Inspection and Verification
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Inspection and Verification

  1. Verify the customer concern.
  2. Verify the stoplamps operate correctly by applying and releasing the brake pedal with the ignition 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. Visually inspect for obvious signs of mechanical or electrical damage.
    VISUAL INSPECTION CHART

    Mechanical Electrical
    • Base brake system
    • Brake booster vacuum hose
    • Hydraulic Control Unit (HCU)
    • Steering components
    • Suspension components
    • Tire pressure
    • Tire size or mismatched tires
    • Wheel speed sensor ring
    • ABS module
    • Battery Junction Box (BJB) fuse(s):
      • 52 (10A)
      • 68 (60A)
      • 69 (60A)
    • Brake Pedal Position (BPP) switch
    • Brake booster vacuum sensor
    • Stability/traction control switch
    • Wheel speed sensor
    • Wiring, terminals or connectors
  4. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
    5. NOTE: Make sure to use the latest scan tool software release.
  5. If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
    6. NOTE: The Vehicle Communication Module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM.
  6. If the scan tool does not communicate with the VCM:
    • check the VCM connection to the vehicle.
    • check the scan tool connection to the VCM.
    • refer to MODULE COMMUNICATIONS NETWORK , No Power To The Scan Tool, to diagnose no power to the scan tool.
  7. If the scan tool does not communicate with the vehicle:
    • verify the ignition is ON.
    • verify the scan tool operation with a known good vehicle.
    • refer to MODULE COMMUNICATIONS NETWORK to diagnose no response from the PCM.
  8. Carry out the Network Test.
    • If the scan tool responds with no communication for one or more modules, refer to MODULE COMMUNICATIONS NETWORK .
    • If the Network Test passes, retrieve and record Continuous Memory Diagnostic Trouble Codes (CMDTCs).
  9. Clear the continuous DTCs and carry out the self-test diagnostics for the ABS module.
  10. If the DTCs retrieved are related to the concern, go to the ABS Module DTC Chart . For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES .
  11. If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART .
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