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Thread: Check engine light broken
          
   
   

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  1. 01-05-2011 04:50 PM #7
    robot's Avatar
    robot
    robot is offline CHR Member
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    Car Year, Make, Model: 39 Ford Coupe, 32 Ford Roadster
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    Don,
    Are you saying that you can verify that the hot side of the MIL bulb has 12 volts? If so, can you force a ground on the other side and see if the bulb illuminates? If it is a LED, it is polarity sensitive....wired backward will not work.

    You are correct that the ECM is sinking, not sourcing (grounding, not suppling the 12 v)
    Last edited by robot; 01-05-2011 at 04:54 PM.
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