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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 48 (Four Wheel Drive (4WD) Systems -- F250-F550 Super Duty) >> Diagnosis And Testing >> Four Wheel Drive (4WD) Systems - Electronic Shift >> Inspection and Verification

Inspection and Verification

WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the customer concern.
  2. Visually inspect for obvious signs of mechanical or electrical damage.
    VISUAL INSPECTION CHART

    Mechanical Electrical
    • Front axle assembly
    • Constant Vacuum Hublock (CVH)
    • Gearmotor encoder assembly
    • Dual-cone synchronization clutch
    • Driveshaft and U-joints
    • Vacuum leaks
    • Fluid leaks
    • Matching tire size
    • Transfer case
    • Vacuum pump (diesel only)
    • Battery Junction Box (BJB) fuse(s):
      • 39 (10A)
      • 40 (15A)
      • 53 (10A)
      • 84 (30A)
    • Wiring, terminals or connectors
    • Gearmotor encoder assembly encoder assembly
    • Mode Select Switch (MSS)
    • Hublock vacuum solenoid
    • Transfer Case Control Module (TCCM)
  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 ON.
    • 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. Clear the continuous DTCs and carry out the self-test diagnostics for the PCM and TCCM.
  9. If the DTCs retrieved are related to a driveability concern, refer to the INTRODUCTION - GASOLINE MODELS before proceeding to the next step.
  10. If the DTCs retrieved are related to the concern, go to the Transfer Case Control Module (TCCM) DTC Chart .
  11. If no DTCs related to the concern are retrieved, GO to Symptom Chart - Electronic Shift  or GO to Symptom Chart - NVH .
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