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Old 08-31-2008, 07:27 PM
MECHANICALINSULATOR MECHANICALINSULATOR is offline
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DTC p0678/p0676/p0674/p0672

I have an 01' excursion with a 7.3L. its stock. These codes were stored. I looked them up and all it says is glo plug circuit for cylinders 2,4,6,8.
I am assuming the bank is fed from the same place. I do not have a wiring diagram for glo plug circuit so I dont know if its fed from a relay fuse or fusable link. Any one else have this happen? Any suggestion on were to look first? Also it says high voltage at 110v dc so could it be a transfomer?
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Old 08-31-2008, 07:51 PM
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most likely is a smoked under-valve-cover harness on the even side..
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Old 08-31-2008, 08:02 PM
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you can ohm out the GP at the VC...if its a bad wire or GP you will beable to tell..if there good you will need to trace the wires back..i think the X does not have a GP relay..its done though the PCM...here is the pin out and specs..

Pin Out
G G I I C I I G G
G=Glow Plug +
I = Injector +
C= Injector Common
***The injectors fire with a 115VDC signal from the IDM do not pierce to wires to test.***
Ohm between "I" and "C" to test the injectors, should be less than 5.0 Ohms
To check glow plugs Ohm between "G" and battery ground should be between 0.1 and 2.0 Ohms
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Old 08-31-2008, 08:05 PM
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Is the truck starting and running alright? Could be codes stored from P O problems.
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Old 08-31-2008, 08:23 PM
MECHANICALINSULATOR MECHANICALINSULATOR is offline
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Truck starts and runs fine but its 70 degrees here. next week when its 32 it might not start so good. Will check with meter in morning.Thanks for help.
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Old 08-31-2008, 08:27 PM
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EBSCOhost - world?s foremost premium research database service

you can find wire diagram in here..type "Library" for user name and password
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Old 08-31-2008, 08:29 PM
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Clear the codes and see if they come back. could just be some left overs.
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Old 08-31-2008, 08:37 PM
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I have the diagram that you need. I'ts just to big to post here. Did you set up email here? I can send it to you.
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Old 08-31-2008, 08:41 PM
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Originally Posted by megawatt00 View Post
I have the diagram that you need. I'ts just to big to post here. Did you set up email here? I can send it to you.
Jim he needs more post to get or send PM's...ill post my email. thewandier@aol.com he can send me a msg and ill send his address to you if would like...
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Old 08-31-2008, 08:43 PM
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Jim he can send or get pm's..not enough post's..he can e mail me and ill send his address to to you... thewandier at aol dot com...
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Old 09-01-2008, 04:27 PM
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OK got a late start. Just checked GPs at VC and the readings are good. I got .6-.8-.9-.9 and all injectors are good to. followed wires back to a block next to water seaperator. All wires from both VC go to this block. will try to get numbers off of it and see what it is.
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Old 09-01-2008, 04:54 PM
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OK Thanks ron got the wiring diagram and found the GPCM. It has power on both hot legs so the fusiable link is good and the plugs ohm out ok so I will assume its the GPCM thats bad. Will order one tomorrow. Thanks for help.
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