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Pinpoint Test T: The 4X4 Low Indicator Is Never/Always On

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
  1. T1 VERIFY THE 4-WHEEL DRIVE OPERATION 
    • Test drive the vehicle and verify that the vehicle is in 2-wheel drive when the 4x4 LOW is switched off, and that the 4-wheel drive low operates when switched to the 4x4 LOW range.
    • Does the 4x4 LOW range operate correctly? 
  2. T2 CARRY OUT THE INSTRUMENT CLUSTER 4-WHEEL DRIVE TRANSFER CASE CONTROL ACTIVE COMMAND USING THE DIAGNOSTIC TOOL 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command.
    • Select the instrument cluster indicator lamp control active command. Trigger the 4-wheel drive low active command on and off. Observe the 4x4 LOW indicator.
    • Does the 4x4 LOW indicator illuminate when triggered on and turn off when triggered off? 
    • Yes  : GO to T3.
    • No  : GO to  T4.
  3. T3 CHECK FOR CORRECT POWERTRAIN CONTROL MODULE (PCM) OPERATION 
    • Disconnect all the PCM connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all the PCM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
  4. T4 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all the instrument cluster connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all the instrument cluster connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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