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No signal power to activate relay on fuel pump and starter

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

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 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

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Thursday, November 18th, 2021 AT 7:54 PM

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