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Home >> Ford >> 2012 >> Explorer Base, 3.5 8, AWD, 6F50 >> Repair and Diagnosis >> External Pages >> Different car >> Section 53 (Four Wheel Drive (4WD) Systems) >> Diagnosis And Testing >> Electronic Locking Differential (ELD) System >> 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.
    VISUAL INSPECTION CHART

    Mechanical Electrical
    • Rear axle assembly
    • Matching tire sizes
    • Battery Junction Box (BJB) fuse(s):
      • 39 (10A) (if equipped with Electronic Shift-On-The-Fly (ESOF))
      • 40 (15A)
      • 53 (10A)
      • 84 (30A) (if equipped with ESOF)
    • Wiring, terminals or connectors
    • Mode Select Switch (MSS)
    • Electronic Locking Differential (ELD) field coil
    • 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.

    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.

    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 - DIESEL MODELS or ENGINE CONTROLS - INTRODUCTION (EXCEPT DIESEL & HYBRID) (SECTION 0) before proceeding to the next step.
  10. If the DTCs retrieved are related to the concern, go to the Transfer Case Control Module (TCCM) - Electronic Locking Differential (ELD) System DTC Chart .
  11. If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART  - .
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