uletek

I'm having a problem with the wiring to injector #7. My noid light is not flashing (other injector connections do) so I need to trace out the wire. I am getting 3.5 - 4v on the positive with the ignition on, so it's the ground signal that's not working. I need to know where to look. Does anyone have a fuel injection wiring diagram? or know the pin on the ECU that sends the signal ground to #7?

Redneck Truck

There is a complete 2000 or 2001 C5 wiring diagram floating around on here with 3 pages dedicated to engine wiring. I don't have it saved anymore, but if you do a search you'll find the link.

uletek

I found the wiring diagrams. The Black/Blue is hot when the key is turned. I traced this wire from the fuel injection relay to the injector connector and it's good. The Green/White is the ground signal from the ECU (pin 24). I traced this wire from the ECU plug to the injector connector and again it's good. Now I wonder if I have a bad ECU.

Also, can you swap ECUs or will it fail to start due to the immobilizer?