That tricky C/OPN Relay
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Instructor
Joined: Apr 2020
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From: NY
That tricky C/OPN Relay
Ah, finally found the description of how it works.
Here's a PDF of it.
https://f01.justanswer.com/El_Jared/...mp+circuit.pdf
Here's a PDF of it.
https://f01.justanswer.com/El_Jared/...mp+circuit.pdf
Thread Starter
Instructor
Joined: Apr 2020
Posts: 968
Likes: 137
From: NY
I did take spare fuse and did the swap this swap that attempt, All the fuses check out ok. The relays work w/ the ECM as described by the tech docs. Wild goose chase in this area.
If the crank or cam sensor went south the ECM should have logged a DTC.
My only concern now is, if the fuel pump is bad then why no DTC for low pressure? Does the ECM only check that when engine is running?
If the crank or cam sensor went south the ECM should have logged a DTC.
My only concern now is, if the fuel pump is bad then why no DTC for low pressure? Does the ECM only check that when engine is running?
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