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No ECM signal from ECM to fuel pump relay

Tiny
CHARLESHOPPER
  • MEMBER
  • 2004 CHEVROLET TRUCK
  • 6.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 220,075 MILES
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.
Wednesday, April 7th, 2021 AT 8:31 AM

2 Replies

Tiny
CHARLESHOPPER
  • MEMBER
  • 2 POSTS
I need to know if you guys found anything on my problem on this 2004 c4500 with duramax diesel yet?
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Wednesday, April 7th, 2021 AT 2:14 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 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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Wednesday, April 7th, 2021 AT 4:01 PM

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