No signal power to activate relay on fuel pump and starter

HARRINGTONGHT

MEMBER
2007 CHEVROLET MONTE CARLO
3.5L
V6
2WD
AUTOMATIC
138,000 MILES

Had a rodent issue got all wiring repaired but now I have no signal power to the relay for the fuel pump and no signal power to the starter relay but I have power to the other side of both relays and I have no crank no start but everything else works I'm trying to track down possibilities of what it could be or if they are linked together anywhere any help or wire diagrams would be very helpful.

Thursday, November 18th, 2021 AT 7:44 AM

1 Reply

JACOBANDNICKOLAS

MECHANIC
110,055 POSTS

Hi,

I just went through the schematics. The first two pics below show the starter relay trigger wire. It's the yellow one that goes to the ECM.

Pic 3 shows a portion of the ECM where the power goes to the pump relay signal and the starter relay signal originate. One of the wires is yellow and the other is dark green with a white tracer. I have a feeling those two wires, which are side by side on the ECM, need to be repaired. The ECM module is inside the air filter box, and it would have been easy to miss them when doing the repairs.

Check that out and let me know what you find.

Take care,

Joe

See pics.

Images (Click to make bigger)