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

WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. L1 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND PCM SELF-TESTS 
    • Retrieve the recorded DTCs from the PCM continuous and on-demand self-tests.
    • Are any DTCs retrieved? 
    1. YES  : REFER to the INTRODUCTION - GASOLINE ENGINES to continue diagnosis of the DTCs.
    2. NO  : Go to  L2.
  2. L2 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND INSTRUMENT CLUSTER SELF-TESTS 
    • Retrieve the recorded DTCs from the instrument cluster continuous and on-demand self-tests.
    • Is DTC U0294 retrieved? 
    1. YES  : CLEAR the DTCs, REPEAT the self-test. If DTC U0294 is retrieved again, go to  L4 .

      For all other instrument cluster DTCs, REFER to the INSTRUMENT CLUSTER DIAGNOSTIC TROUBLE CODE (DTC) INDEX .

    2. NO  : Go to  L3.
  3. L3 CARRY OUT THE INSTRUMENT CLUSTER INDICATOR LAMP CONTROL 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 MIL indicator active command on then off again. Observe the MIL warning indicator.
    • Does the MIL warning indicator illuminate when commanded on and turn off when commanded off? 
    1. YES  : Go to  L4.
    2. NO  : Go to  L5.
  4. L4 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect the PCM connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the PCM connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . 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.
  5. L5 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all the instrument cluster connectors.
    • Check for:
      • corrosion
      • damaged pins
      • 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? 
    1. YES  : INSTALL a new instrument cluster. REFER to Instrument Cluster (IC) . 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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