Join Date: Dec 2011
Location: Humboldt/Sacramento county, CA
Re: Glow plug control module
Yes the module can go bad, replace them pretty often.
I always measure the ohms of each glow plug by disconecting the harness above the valve cover and testing the pins (outer two on either side of the connector). Should see about an ohm of resistance, if you have one thats way off (higher) then thats your issue. This also rules out UVCH issues since the readings will be higher if the plug is backed out.
If you resistances are good then you have a bad module.
03 CCSB King Ranch 4X4 6.0, IDP Xstreet, Muffler delete. firstname.lastname@example.org
00 CCSB, ZF6, 2WD. RIP 1-22-12
06 Mitsubishi Evolution IX SSL, LR 2.0, TS EFR9180, E85, 4 slicks and a chute...maybe some other stuff
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69 Camaro, awaiting turbo LSX and chassis work