Inspection and Verification
WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
- Verify the customer concern.
- Inspect for obvious signs of mechanical or electrical damage.VISUAL INSPECTION TABLE
Mechanical Electrical - Active Torque Coupling (ATC) solenoid (part of rear axle)
- Power Transfer Unit (PTU)
- Rear Drive Unit (RDU)
- Halfshafts and CV joints
- Driveshaft and U-joints
- Fluid leaks
- Wheel/tire size and brand
- Matching tire size and brand
- Tire pressure
- Smart Junction Box (SJB) fuse(s):
- 11 (10A)
- 35 (10A)
- 4X4 control module
- Wiring harness
- Connector(s)
- Circuitry
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).NOTE: Make sure to use the latest scan tool software release.
- 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 PINPOINT TEST AF: NO POWER TO THE SCAN TOOL , to diagnose no power to the scan tool.
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 vehicle:
- verify the ignition is in the ON position.
- refer to PINPOINT TEST A: THE PCM DOES NOT RESPOND TO THE SCAN TOOL 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 INSPECTION AND VERIFICATION .
- If the network test passes, retrieve and record Continuous Memory Diagnostic Trouble Codes (CMDTCs).
- Clear the DTCs and carry out the self-test diagnostics for the 4X4 control module.
- If the DTCs retrieved are related to the concern, go to the 4X4 CONTROL MODULE DTC TABLE . For all other DTCs, refer to DIAGNOSTIC TROUBLE CODE (DTC) TABLE .
- If no DTCs related to the concern are retrieved, GO to SYMPTOM TABLE .