Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Inspection and Verification
2009 Ford Expedition RWDSECTION Inspection and Verification
NOTE:
If a new ABS module is installed, it must be configured. Refer to Programmable Module Installation (PMI) in
MODULE CONFIGURATION
article.
- Verify the customer concern.
- Verify the stoplamps operate correctly by applying and releasing the brake pedal with the ignition switch in the OFF position. If the stoplamps do not operate correctly, refer to Diagnosis and Testing in EXTERIOR LIGHTING article. If the stoplamps operate correctly, proceed to the next step.
- 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 solenoid
- Brake fluid level switch
- Stability control sensor cluster
- Stability/traction control switch
- Steering wheel rotation sensor
- Wheel speed sensor
- Wiring, terminals or connectors
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
-
NOTE: Make sure to use the latest scan tool software release.
If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
-
NOTE: The Vehicle Communication Module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM .
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 article, No Power To The Scan Tool, to diagnose no power to the scan tool.
- If the scan tool does not communicate with the vehicle:
- verify the ignition key is in the ON position.
- verify the scan tool operation with a known good vehicle.
- refer to MODULE COMMUNICATIONS NETWORK article to diagnose no response from the PCM.
- Carry out the network test.
- If the scan tool responds with no communication for one or more modules, refer to MODULE COMMUNICATIONS NETWORK article.
- If the network test passes, retrieve and record continuous memory DTCs.
- Clear the continuous DTCs and carry out the self-test diagnostics for the ABS module.
- If the DTCs retrieved are related to the concern, go to the ABS MODULE DTC CHART . For all other DTCs, refer to the Master DTC Chart in MULTIFUNCTION ELECTRONIC MODULES article.
- If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.