Testing GPCM
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Senior User
Joined: Apr 2004
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From: pittsburgh,pa
Testing GPCM
How exactly do you test the GPCM? I need to test and find out if its supplying power to GP #5. Thats the glowplug I am getting a code for. (P0675)
What type of reading should I get from the pin on the GPCM? I figured I would test the GPCM before replacing the glow plug.
Can a glowplug be tested without pulling the valve cover?
Thanks
What type of reading should I get from the pin on the GPCM? I figured I would test the GPCM before replacing the glow plug.
Can a glowplug be tested without pulling the valve cover?
Thanks
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
If you remove the 9 pin connector from the center inboard side of the passenger side valve cover, grab an ohm meter and check the 2nd to last pin (2nd closest to the windshield) against a battery ground. If you get an ohm reading less than 2.0, your glow plug and connection is good.
If you want to test output from the GPCM right after the key is turned on, you can use this diagram
If you want to test output from the GPCM right after the key is turned on, you can use this diagram
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GreenTerracePSD
1999 - 2003 7.3L Power Stroke Diesel
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