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Thread: CEL won't come on

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  1. #1
    Junior Member
    Join Date
    Oct 2018
    Posts
    20

    CEL won't come on

    I'm at the point to crank the engine of my new project XB12R. When I turn the key on, the CEL does not light up and it won't crank over. I have gone through the trouble shooting steps in the manual. Ground pin 7 of the instrument Module (39). When I ground this pin the CEL lights up. that is great but the manual says that my ECM is bad.

    Question, what would cause the ECM to fail in this manner? The manual only reads, Replace ECM. See
    4.16 ELECTRONIC
    CONTROL MODULE.

    No other explanation or other test to determine what caused the ECM flailure.

    Has anybody else had this problem and what sub system should I look at so as not to fry a new ECM?

    I might have skipped a few steps. Thinking about it now, I need to check the the switch on the control housing. I noticed the harness coming out of it is not zip tied to the housing like the left. There may be a damage connection to the switch or the switch was damaged due to it being a basket case project.
    Please, if anyone has any useful information on this condition share.

    Thank you
    Last edited by 45vtwin; 10-24-2019 at 01:13 PM.

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