Engine wiring diagrams please?

Tiny
WIZARDKHALIFA
  • MEMBER
  • 2003 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 180,000 MILES
So my AT tire rubbed a couple of wires just out of my PCM when I made a sharp right turn. Two dark blue with white stripe and one orange wire. The truck stalled out and I repaired the wires and now when I turn the key to on, everything works, when I try to start the display goes black and I do not get any power to the starter.

So far I have checked all fuses. All of the relays will engage when I jump them off the battery, and I jumped my starter off the terminal to the battery and I get power to the starter but it will not crank/run.

I am out of ideas. What do I need to do?
Saturday, December 1st, 2018 AT 4:13 PM

4 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

Can you post a picture of the wires that were rubbed?

Did you check the battery voltage to be sure it is good.

https://www.2carpros.com/articles/car-cranks-but-wont-start

I will attach a wiring diagram for you to view. You will need to verify power from the ignition switch to the fuse to the relay and the PCM.

Roy
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Saturday, June 5th, 2021 AT 2:48 PM
Tiny
WIZARDKHALIFA
  • MEMBER
  • 3 POSTS
I cannot get a picture at the moment but both come out of the bottom of the PCM and were a dark blue with white line, there was a yellow/orange wire that was slightly exposed and I reattached then taped and retaped the group. The only one getting power with the car on was one of the blue/white wires and it had a strong reading.
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Saturday, June 5th, 2021 AT 2:48 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,883 POSTS
Is the security light flashing? Here is the complete wiring diagrams for the PCM so you can check your work. Let us know what you find
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Saturday, June 5th, 2021 AT 2:48 PM
Tiny
WIZARDKHALIFA
  • MEMBER
  • 3 POSTS
Okay, I did have a chance at work today to check my relay grounds today while I was at work (truck is at the office) I fixed the problem (bad PCM ground) thank you.
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Saturday, June 5th, 2021 AT 2:48 PM

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