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Thread: P08 Pinout

  1. #1
    Lifetime Member Road's Avatar
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    Default P08 Pinout

    Anyone have a pinout to make a bench harness for a 99-02 Cavalier with P08?

    Thanks

  2. #2
    Forum tyhee Site Admin GMPX's Avatar
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    Pretty sure it is the same as the LS1B.


  3. #3
    Lifetime Member Road's Avatar
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    Quote Originally Posted by GMPX View Post
    Pretty sure it is the same as the LS1B.
    No it is different. Even has way less terminal pins. I have tried LS1B, V6 Buick, Northstar pinouts as they are all different too.

  4. #4
    Forum tyhee Site Admin GMPX's Avatar
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    Yes it has less pins but the important ones are in the same spot.
    The LS1B bench harness I have runs all those PCM's you've listed there, V6-P04, Northstar-P06, they are all the same pinout for bench connections (and of course E54 - LB7).
    I just put a P08 on my LS1B bench harness and it works fine.

    Blue 60 = Ground
    Blue 20 = 12V Unswitched (Batt)
    Blue 19 = 12V Switched
    Blue 58 = VPW Serial Data


  5. #5
    Lifetime Member Road's Avatar
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    Quote Originally Posted by GMPX View Post
    Yes it has less pins but the important ones are in the same spot.
    The LS1B bench harness I have runs all those PCM's you've listed there, V6-P04, Northstar-P06, they are all the same pinout for bench connections (and of course E54 - LB7).
    I just put a P08 on my LS1B bench harness and it works fine.

    Blue 60 = Ground
    Blue 20 = 12V Unswitched (Batt)
    Blue 19 = 12V Switched
    Blue 58 = VPW Serial Data
    Interesting... I will try again and count the pins on the LS1B Connector instead of the ecm.

    Oddly if I connect a V6 Buick to my LS1B harness it will blow fuses immediately. (Using a older Kent Moore bench harness)
    Connecting to this Cavalier one and it back feeds power to the key on circuit.

    EFI Connection sells a seperate harness for all these for this reason
    Click image for larger version. 

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    Click image for larger version. 

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  6. #6
    Lifetime Member Road's Avatar
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    My harness had to many wires. I simplified it down and works. You was right as normal... Thanks for the help.

  7. #7
    Forum tyhee Site Admin GMPX's Avatar
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    Quote Originally Posted by Road View Post
    I simplified it down and works.
    Yeah that's the trick, those four wires I mentioned are common for all those PCM's that look like that.


  8. #8
    Lifetime Member Road's Avatar
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    Quote Originally Posted by GMPX View Post
    Yeah that's the trick, those four wires I mentioned are common for all those PCM's that look like that.
    After all that she is a end of the line ecm with unsupported calibration. Ha. Thanks again though

  9. #9
    Forum tyhee Site Admin GMPX's Avatar
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    Probably a project that should never have happened to be honest, horrible PCM that one.


  10. #10
    Lifetime Member Road's Avatar
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    Quote Originally Posted by GMPX View Post
    Probably a project that should never have happened to be honest, horrible PCM that one.
    I never had the calls for them till recently. Local dirt tracks now have a class for these front wheel drive cars and becoming very popular.

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