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Home >> Mercedes Benz >> 2025 >> eSprinter Base, _NA_ >> Repair and Diagnosis >> External Pages >> Different car >> Section 2340 (Transfer Case - Four-Wheel Drive (4WD) System - Diagnostics -- F250-F550 Super Duty) >> Diagnostic Tests >> Four Wheel Drive (4WD) Systems - Electronic Shift >> Inspection and Verification >> Notes

Inspection and Verification: Notes

WARNING: This page is about a different car, the 2009 Ford Pickup, 2009 Ford F550 Super Duty, 2009 Ford F450 Super Duty, and 2009 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
    • Pulse vacuum hub locks (PVH)
    • Shift motor
    • Synchronization clutch
    • Driveshaft and U-joints
    • Vacuum leaks
    • Fluid leaks
    • Matching tire sizes
    • Transfer case
    • Smart junction box (SJB) fuses:
      • 35 (10A)
      • 40 (20A)
      • 43 (10A)
    • Wiring harness
    • 4X4 control module
    • Shift relays
    • Shift motor encoder assembly
    • Mode select switch (MSS)
    • Connector(s)
    • PVH solenoid assembly
    • Vacuum solenoid (diesel only)
    • 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 article, No Power To The Scan Tool, to diagnose no communication with the scan tool.
  6. If the scan tool does not communicate with the vehicle:
    • verify the ignition key is in the ON position.
    • verify the scan tool operation with a known good vehicle.
    • refer to MODULE COMMUNICATIONS NETWORK article 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 article.
    • If the network test passes, retrieve and record continuous memory DTCs.
  8. If the DTCs retrieved are related to a driveability concern, refer to the INTRODUCTION - GASOLINE ENGINES article or INTRODUCTION - 6.4L DIESEL ENGINES article before proceeding to the next step.
  9. If the DTCs retrieved are related to the concern, go to the 4X4 Control Module DTC Chart to continue diagnosis.
  10. If the DTCs retrieved are not found in the 4X4 Control Module DTC Chart, refer to the DTC Chart in MULTIFUNCTION ELECTRONIC MODULES article.
  11. If no DTCs related to the concern are retrieved, go to Symptom Chart - Electronic Shift .
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