LS ECM Wiring?

MZZCRUELLA

MEMBER
1983 CHEVROLET EL CAMINO
AUTOMATIC
10,000 MILES

Hello,

I am trying to help someone figure out or identify the wiring in the vehicle listed above. It is my understanding that there has been a LS swap done, I’m so sorry if I’m not explaining this correctly. This ECM is or has been hooked up already, I’m not looking for help with harness or pin stuff I don’t think. Being that this a different motor and computer the original cluster has been disabled, we are trying to connect a new cluster that supports this ECM. The wires I guess from the new cluster need to connect with the wiring coming from the ECM, I think it’s about 70 wires. I hope some of this makes sense. I’ve attached a picture of the computer thing.
Thank you

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7 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Okay, this part number is for a:

2001-2002 Silverado 1500

Here are the PCM and engine wiring diagrams so you can try to connect the instrument cluster. Check out the images (below). Let us know if you need anything else.

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Saturday, November 2nd, 2024 AT 10:29 AM

MZZCRUELLA

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Thank you for the reply. I’m assuming this is a stupid question but are any of these showing the Pinout? I don’t know if I mentioned I know nothing about this stuff, I'm trying to help someone that is attempting to connect a digital cluster to his car that has a different motor and computer thing now. I know the car has been “tuned” and now just needs the cluster. I guess I’m looking to know which wires and where in the back of the computer plug/pin are what which wire is what? Leading from the plug on the back? I’m so sorry if this is not making any sense.

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Monday, November 4th, 2024 AT 8:00 AM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

You are okay, I understand, here is the pinouts for the PCM for the 2001 chevy 1500 both the red and blue connectors. Check out the images (below). Let us know if you need anything else.

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Monday, November 4th, 2024 AT 10:13 AM

MZZCRUELLA

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9 POSTS

Thank you so much. I’m sure this will be most helpful, although I think we shouldn’t even be messing around with this and should be done by a professional clearly we have no idea. Hopefully we don’t totally mess this up. Thanks again.

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Thursday, November 7th, 2024 AT 11:34 AM

KEN L