Wiring diagram needed?

Hi,

I would be happy to get one for you, but we need to narrow it down by circuit. Otherwise, I'll end up sending way too many pics and it will take forever to get every one.

Let me know.
Joe

Hmmm. Well. I guess we’d be looking at the ignition circuit perhaps, and the PCM connections too, if possible.
Thanks,
-Ron

Hi,

If you look below, I attached the schematics for engine control. There were three pages of schematics. I had to cut each page in half to make them readable for you. I did overlap them so you can follow from one to the next.

Take a look and let me know if they help.

Taka care,

Joe

See pics below.

Hello. Here’s what i found out at a shop i had my vehicle fixed at $1,200 later.

Eng: 3.4l, v6 (209ci) vin(f)
Description of services
No crank no start - thinks it is electrical issues
Verified the customer's concern of no crank
Checked the gm service information for technical service bulletins, recalls, special coverage, and service updates
And found no documents related to the vehicles concern
Pushed vehicle inside, raised the vehicle and performed a visual inspection
Accessed the diagnostic port and performed a scan which found code is related to loss of communication and then
Cleared all codes and reconfirmed active diagnostic trouble code(s) for loss of communication
Performed strategy-based diagnostics
Tested the PCM, TCM wiring both power and grounds
Found customer ran ground wire to PCM. TCM has no communication as well traced back result of customer ran
Ground wire. Found burnt wire. Replaced burnt wire to and from the PCM, this was the same case for the TCM, and
Immo module. This disabling the engine from starting. Repaired wiring, and attempted communication. Found 2
Blown fuses. Reestablished communication. DTCs would then clear. Vehicle still would not start. Found that
Calibration has been cleared from the ECM. Performed ECM programming. After programming found that the vehicle
Now it starts and shuts off. Communication was established with the immo and found that it was in anti-theft protection.
Performed immobilizer relearn, vehicle started and ran. Noticed coolant leak when engine was running. Upon
Inspection found that the radiator was leaking pretty badly. As vehicle continued to run found that it was
Starting to idle poorly and noticed that there was a vacuum line disconnected on the back of the engine.
Reconnected vacuum line and reset fuel trims. Engine idled well. Parked vehicle outside. Next day went out to
Vehicle and it was dead. Had to be jumped. After giving jump start, vehicle started. Tested battery and battery
Failed. Recommend battery.
Labor: $1,317.50 hours: 8.50
Description sale extended
Quantity
Relay 1.00 $17.90 $17.90
Parts: $17.90
Sublet:$0.00
Job total: $1,335.40

1/10/2025
01/08/2025 radiator - remove and replace

Now, today, my temperature gauge seems to have stopped working (just sits at low and doesn’t move) and both radiator fans stay running all the time while vehicle is running. Display instrument information panel shows engine hot a/c off and service tire monitor system, check engine light is on and (blinking) yellow exclamation point is on.


Heat works and vehicle doesn’t seem to be overheating really, even though the above is occurring.

Please start a new question for the coolant temperature gauge issue. Please post your new question here, you must be logged in.

https://www.2carpros.com/questions/new

Cheers, Ken