Where does ECU ground at?

S

slow94

Well-known member
I know pins 20, 40, and 60 are the ECU grounds. However, where exactly do they ground at on the truck?

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Thought they ground in the main engine comp harness at the front core support and the pass fender
 
Yeah looks like pin 20 grounds at driver's fender near hood hinge and 40/60 ground st driver side core support. Then I think a jumper wire goes from there to passenger side fender to battery ground.

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Steve83 said:
Same as what this diagram shows:

(click this text)


There are no jumper wires in the ground system - "grounding" means it uses the body & chassis metal to get back to the B- post.
Click to expand...

I think by "jumper" he just meant where the neg battery cable goes to the "post in the pass side fender. When I first dragged my truck out of storage I had to chase down some ground issues and they were primarily at the core support. Played havoc with my PSOM (for the short while I had a stock dash), turn signals, headlights, etc.
 
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