Engine wiring diagrams please?

2003 CHEVROLET TAHOE

180,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC

WIZARDKHALIFA

MEMBER
3 POSTS
FOLLOW

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?

Dec 1, 2018 at 4:13 PM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.

ASEMASTER6371

AUTOMOTIVE REPAIR CONTRIBUTOR
52,796 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

Image (Click to enlarge)

Jun 5, 2021 at 2:48 PM

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.

Jun 5, 2021 at 2:48 PM

STRAILER

AUTOMOTIVE REPAIR CONTRIBUTOR
54,176 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

Images (Click to enlarge)

Jun 5, 2021 at 2:48 PM

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.

Jun 5, 2021 at 2:48 PM