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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 144 (Four Wheel Drive (4WD) Systems -- F150) >> Diagnosis And Testing >> Four Wheel Drive (4WD) Systems - 2-Speed Torque-On-Demand >> Inspection and Verification

Inspection and Verification

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  1. Verify the customer concern.
  2. Visually inspect for obvious signs of mechanical or electrical damage.
    Mechanical Electrical
    • Halfshafts
    • IWEs
    • Driveshaft and U-joints
    • Vacuum leaks
    • Fluid leaks
    • Matching tire sizes
    • Transfer case
    • BJB fuses:
      • 20 (20A)
      • 29 (10A)
      • 54 (5A)
      • 68 (25A)
    • BCM fuse 34 (10A) (vehicles with ELD only)
    • Wiring, terminals or connectors
    • MSS
    • Synchronization clutch
    • IWE solenoid
    • Transfer case shift motor
  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:
    • verify the ignition is in the ON position.
    • verify the scan tool operation with a known good vehicle.
    • REFER to MODULE COMMUNICATIONS NETWORK to diagnose no response from the PCM.
  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 Diagnostic Trouble Codes (CMDTCs).
  8. Carry out the self-test diagnostics for the TCCM.
  9. If the DTCs retrieved are related to the concern, go to the TCCM 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  or GO to Symptom Chart - NVH .
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