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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Transfer Case - Four-Wheel Drive (4WD) System - Diagnostics) >> Diagnosis And Testing >> Four Wheel Drive (4WD) Systems >> Inspection and Verification

Inspection and Verification

WARNING: This page is about a different variant/trim than selected.
  1. Verify the customer concern.
  2. 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
  3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
    4. NOTE: Make sure to use the latest scan tool software release.
  4. If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
    5. NOTE: The Vehicle Communication Module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM  .
  5. 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.
  6. If the scan tool does not communicate with the vehicle:
  7. 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 DTCs.
  8. Clear the DTCs and carry out the self-test diagnostics for the 4X4 control module.
  9. 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 .
  10. If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART - FOUR WHEEL DRIVE SYSTEM .
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