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Thread: Please help new to forum! 03 Mach 1 No Communication via PCM/ECU

  1. #11
    Posting and liking.... Ponyryd's Avatar
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    Did they actually check feeds and grounds to the computer?

  2. #12
    BlueMach
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    Maxi fuses are ok tested with test light.
    The electric fan from rad runs as soon as key is in run position. Someone said that’s a default showing pcm is bad?

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    @ponyryd to be honest I don’t know if they did...

  3. #13
    Club Supporter Laffs's Avatar
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    Have you checked your CCRM relays?
    Quote Originally Posted by ludacris View Post
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  4. #14
    Admin ZR's Avatar
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    or just pull plug out of it n turn key on.

  5. #15
    BlueMach
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    @ZR when you say plug, you mean main computer plug? Or module? Thx

  6. #16
    Club Supporter Laffs's Avatar
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    I believe he means unplug the CCRM relay module in the passenger side front fender and see what it does.
    Quote Originally Posted by ludacris View Post
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  7. #17
    Posting and liking.... Ponyryd's Avatar
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    Quote Originally Posted by BlueMach View Post
    Maxi fuses are ok tested with test light.
    The electric fan from rad runs as soon as key is in run position. Someone said that’s a default showing pcm is bad?

    - - - Updated - - -

    @ponyryd to be honest I don’t know if they did...
    Fan will run if there’s certain hard faults I beleve.....it’s a default to protect the engine from overheating if the pcm is unable to accurately monitor the conditions.

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