No ECM signal from ECM to fuel pump relay

2004 CHEVROLET TRUCK
220,075 MILES • 6.6L • V8 • 2WD • AUTOMATIC
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CHARLESHOPPER
  • MEMBER
  • 2 POSTS
This issue is on the truck listed above c4500 with 6.6l diesel engine in it. I am not receiving any signal from ECM when I turn to run/ start position. I am very stumped on this truck. Need help badly.
Apr 7, 2021 at 8:31 AM
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CHARLESHOPPER
  • MEMBER
  • 2 POSTS
I need to know if you guys found anything on my problem on this 2004 c4500 with duramax diesel yet?
Apr 7, 2021 at 2:14 PM
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ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
Good afternoon,

I attached the wiring diagram for you below. Check the ECM connector 2 pin 9 for power with the key on. It will only have power for 2 seconds with the key on. It should have constant voltage while cranking. If there is no voltage the ECM is the issue.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

I attached the procedure replacing the ECM and the programming as well.

Roy
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Apr 7, 2021 at 4:01 PM
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