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Wire diagrams for fuel pump relay and starter relay needed

Tiny
HARRINGTONGHT
  • MEMBER
  • 2007 CHEVROLET MONTE CARLO
  • 3.5L
  • V6
  • 2WD
  • AUTOMATIC
  • 138,000 MILES
I have no power to my starter relay and no power to my fuel pump relay.
Thursday, November 18th, 2021 AT 6:07 PM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,262 POSTS
Hi,

The first two pics on the original post are the entire schematic for the starting system. The pics below show the entire powertrain management system wiring schematics. I had to check them in half to make them readable, but they are overlapped so you can follow from one to the next.

I hope this helps. Let me know if you have other questions or need additional information. Also, make sure to check the ECM located in the air filter housing.

Take care,

Joe

See pics below.
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Thursday, November 18th, 2021 AT 8:30 PM
Tiny
HARRINGTONGHT
  • MEMBER
  • 5 POSTS
Thank you these were very helpful. But how can you tell which wire is in which terminal in the ECM it has two plugs, and I didn't see any markings saying what terminal they were, or which plug is which or am I missing something? Any other suggestions would be greatly appreciated.
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Saturday, November 20th, 2021 AT 1:38 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,262 POSTS
Hi,

There should be two connectors, one black and the other gray. Connector 1 (C1) is black. Connector 2 (C2) is gray.

I attached a pic below of the ECM. The remaining pics are showing which connector controls the different components.

It can be a nightmare figuring things out. Just take your time and let me know if I can help.

Take care,

Joe

See pics below.
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Sunday, November 21st, 2021 AT 5:34 PM
Tiny
HARRINGTONGHT
  • MEMBER
  • 5 POSTS
Hopefully, I can get a chance to do some testing the next couple days. I will let you know if I need anything else. Thanks again.
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Monday, November 22nd, 2021 AT 1:23 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,262 POSTS
You are very welcome. Take your time and let me know if I can help.

Take care,

Joe
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Monday, November 22nd, 2021 AT 6:52 PM
Tiny
HARRINGTONGHT
  • MEMBER
  • 5 POSTS
Thanks again for your help after taking my time and checking all the wires I actually found a bad ground to the ECM that was causing all my problems so any advice for the future might be to check that first with jumper wire or a test light to outer case of the ECM now everything works like normal. Thanks again
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Wednesday, November 24th, 2021 AT 8:47 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,262 POSTS
Hi,

I'm glad to hear you found the problem. They can be difficult. LOL Also, thanks for the update. I know it will likely help others in the future.

Please feel free to come back anytime in the future. You're always welcome.

Take good care of yourself and Happy Thanksgiving.

Joe
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Wednesday, November 24th, 2021 AT 9:18 PM

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