Inspection and Verification

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 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 CHART

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.

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 -- FUSION, MILAN & MKZ 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 is in the ON position.
- refer to MODULE COMMUNICATIONS NETWORK -- FUSION, MILAN & MKZ 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 -- FUSION, MILAN & MKZ article.
- 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 CHART . For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES -- FUSION, MILAN & MKZ article.
If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART .