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I have a 1990 GMC C/K pickup and i was looking for a wiring diagram of the pcm. I have a diagram from a Haynes manual but it doesn't show the wire positions on the actual PCM. I was wondering if anyone had a pin out diagram of the PCM or know where I can find one.

THANKS!!

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The dealer service manuals or Helm's manuals show the pin locations. Check in one of those. Might be harder to come by for a 90, but they exist.

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If someone can't help you with the manuals, try your public library. They usually have these manuals and you can copy the pages you want.

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You can also get a subscription to ALLDATA the diagrams are pretty good,the rest of the info comes in pretty handy also :lol:

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If someone can't help you with the manuals, try your public library. They usually have these manuals and you can copy the pages you want.

You must have a better public library than we do :lol::bs:

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