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I have a 1997 PSD 2X4 CC 4EOD 84K 3" DP 6637 Napa intake 74*FP other than that it's bone stock.I replaced all 8 of the GP's as 2 were dead. VC Gaskets looked good as did the UVC harnesses. Buttoned it up and it threw a CEL that was the above codes which are: GP Monitor Fault Bank #1 & #2
Went back in and closer inspection I found burned connector on one of the VC gaskets. Both gaskets as well as all four UVC harness replaced, all outer connections inspected closely and connections through UVC were checked with an ohm meter. Buttoned it up and get CEL, same problem. Only thing left is the GPR so I replaced it (All parts are Ford) all connections have been cleaned and polished. Clear the codes and all is well, I drive around and really get it warmed up made several stops, fires right up, no code, park it for the night. Next AM Start it up, CEL same codes.
Check wiring diagram of GPR (Wish I knew how to include it but I don't)
Top of the GPR there are two (2) large posts Drivers side goes to starter relay and the other to the shunt that feeds the GP's.
There are two (2) other smaller terminals "B" to test pin #101 and "A" (Top) to fuse #22. Ford Mech tells me that during KOEO GP energized I should have 12V on both "A" & "B". I removed the wires from the GPR and I did have 12V on both "A" & "B".
Hooked the wires back up and again do the same test and I have 12V on "B"
but only 6.35 on "A" I have lost approximately 5V's. Ford says there should be 12 volts at both A & B at all times.
How do I find test pin #101 or better yet....Where is it? I followed the harness to the driver's side where it plugs into another harness which in turn connects to another harness.
I have also been told that the drop in voltage is because "A" goes through a coil prior to the ground in the computer.
Clear the codes, warm it up and it runs like hell let it get cold, CEL Time.
Any and all suggestions are welcomed with open arms. I need to find the solution before I go to plan C which entails a large amount of C-4.
Thanks in advance,