PCM & OBD Grounds

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Dec 26, 2018 | 01:17 PM

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PCM & OBD Grounds

Hi all-

I am trying to diagnose GPR issues and in the process I am getting flakey/bad communictions to my scanner via the OBD port.

I am starting to suspect a bad ground wire somewhere.

Is there a schematic that shows the ground wires and their locations

I dont want to jump to the conclusion that its the PCM is bad without checking the obvious.

Thanks in advance

sinneD

Dec 26, 2018 | 01:27 PM

pirate4x4_camo

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Pcm Ground 101 is by the Battery junction box on the driver side inner fender.

Dec 26, 2018 | 04:00 PM

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is that the same as the 'Test Pin 101" ?

How many grounds are there in this area? Is 101 on the side just in front of the distribution box or is it undrneath the distribution box?

I am also trying to figure out what the 2 relay cases are next to the power distribution box are. I have not been able to identify them or what the relays in side control. The sealing tape has unravelled and I wonder if the relay inside has gotten corroded.

Dec 26, 2018 | 05:08 PM

pirate4x4_camo

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From: Northern California

in the ford factory wiring manual the grounds are labeled G101 - G105

the location is where I am pointing to on the inner fender.

the solinoid boxes are front one is 4X4 shift and the side one is trailer charge