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Thread: PCM or not wired right

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  1. #1
    Join Date
    May 2008
    Location
    Kentucky
    Posts
    144

    PCM or not wired right

    Checklist that we have done and is working.
    1) Checked all grounds and power pins on pcm---- all good.
    2) Getting power and ground to coil packs but no spark.
    3) Relay from nelson harness clicks which ignition key is turned. Which is supposed to.
    4) Fuel pump is working and getting pressure.

    The following pins didn't get any power in off/run/crank
    C2 Pin 59 Crank voltage
    C1 Pin 12 CKP sensor signal
    C1 Pin 39 Starter enable relay control

    Is there any way to test the coil packs to make sure there good?
    Also how would I go about testing the cam and crank sensor making sure there working?

    Is there anything else I should check or is there something in the PCM that should have been turned off that wasn't?


    Ok I hooked up one of those general scan tools and this is what it came up with a codes:
    1) P0120 TPS/Pedal Position Sensor A circuit malfunction
    2) P0220 TPS/Pedal Position Sensor B circuit malfunction
    3) P1516 Manf Contr Speed Idle Speed control auxiliary inputs
    4) P1518 Manf Contr Speed Idle Speed control auxiliary inputs

    I have DBW pedal
    So like a throttle position sensor is it possible the pedal position sensor on the side of the throttle body bad? Also shouldn't once the key is on the throttle work with the pedal?

    Travis
    Last edited by 468Blazer; 08-10-2008 at 11:40 AM.
    1996 GMC extended cab, 2003 5.3/auto

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