Ah, finally found the description of how it works.

Here's a PDF of it.
https://f01.justanswer.com/El_Jared/...mp+circuit.pdf

 

EF-1 fuse would be where I start.

Chip H.

 

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?

 

It's only half-bad.

Chip H.