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Pinpoint Test K: The Malfunction Indicator Lamp (Mil) Is Never/Always On

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. K1 RETRIEVE THE RECORDED DTCs FROM BOTH CONTINUOUS AND ON-DEMAND PCM SELF-TESTS 
    • Check the recorded PCM DTCs from the continuous and on-demand self-tests.
    • Are any PCM DTCs recorded? 
    1. YES  : REFER to INTRODUCTION - GASOLINE ENGINES or INTRODUCTION -- HYBRID ENGINES article.
    2. NO  : Go to  K2.
  2. K2 CARRY OUT THE INSTRUMENT CLUSTER WARNING LAMPS AND CHIME ACTIVE COMMAND USING THE SCAN 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. Select the ALL_LAMP active command on and off. Observe the MIL.
    • Does the MIL illuminate when selected on, and turn off when selected off? 
    1. YES  : Go to  K4.
    2. NO  : Go to  K3.
  3. K3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect the instrument cluster connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the instrument cluster connector and make sure it seats correctly.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new instrument cluster. REFER to Instrument Cluster . TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
  4. K4 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the PCM connectors and make sure they seat correctly.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - 2.3L article, ELECTRONIC ENGINE CONTROLS - 3.0L (4V) article or ELECTRONIC ENGINE CONTROLS - HYBRID article. TEST the system for normal operation.
    2. 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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