Signal from PCM to GPR - Ford Powerstroke Diesel Forum
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Old 11-30-2009, 06:57 PM
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Signal from PCM to GPR

I have a 00 F-350 that I am not getting the ground signal from the pcm to the gpr. Has anybody else had this problem? If so was it a bad pcm or broken wire? Any ideas are appreciated.
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Old 12-01-2009, 04:08 PM
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I chased down the same problem on my 02 F350. Although I know I fried my PCM output to ground the GPR with a wrong GPR. It's recomended to ohm out the wire from the GPR to the plug on the back of the PCM. Keep in mind to properly confirm operation of the GP & GPR the engine needs to be cool and the outside temps should be cool to confirm that the PCM should be calling for the GPR to come on.
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Old 12-01-2009, 05:37 PM
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I am leaning towards a problem with the pcm but will definately ohm the wire from the gpr first. I did check it when it was cold but thanks for the reminder.
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