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PCM Wiring Diagram


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#1 sray650

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Posted 15 July 2004 - 12:31 AM

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!!

#2 99-2door

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Posted 15 July 2004 - 12:02 PM

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.

95 Chevy K3500 SRW converted to 5.7L Vortec 4L80e, 4.10 w/G80
2003 Tahoe w/ Silverado front clip
2001 GMC C3, 6.0L AWD, lowered 3/5, Volant intake, pulleys, tuned with HPtuners by me.

#3 MyBigToy

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Posted 15 July 2004 - 04:51 PM

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.
2002 Z71 Avalanche, Light Pewter Metallic

RADIX; TOG's; Gibson dual extreme cat-back; drop-in K&N; MSD Superconductor wires; 2" drop coils on rear; painted fuse box, cover, & air filter cover; teal wire convolute; holographic red "Avalanche" & "Chevrolet" lettering, red Avalanche windshield decal, Am. flag bowtie decal; Weatherflectors; stainless tube steps; J&J Enterprises stainless grille; body-color painted taillight covers; 80W low hiperwhite Xenon bulbs with hi/low on mod; 55W hiperwhite Xenon fogs; 28W hiperwhite Xenon backups; Line of Fire; Poron reverse sensing system

#4 citydriver

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Posted 15 July 2004 - 10:08 PM

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

Once an ASE Master Tech,Now a Back Yard mechanic w/lots of expensive tools!

2013 GMC 2500HD Crew Cab Standard Box  SLT Z71............ work in progress........

2 weeks ago I couldnt spell TWUK DRIVER..now I IS one!


#5 99-2door

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Posted 16 July 2004 - 01:11 AM

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:

95 Chevy K3500 SRW converted to 5.7L Vortec 4L80e, 4.10 w/G80
2003 Tahoe w/ Silverado front clip
2001 GMC C3, 6.0L AWD, lowered 3/5, Volant intake, pulleys, tuned with HPtuners by me.