GPR Help
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Senior User
Joined: May 2005
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From: Boston
GPR Help
Turn key on GPR not cycleing......Power to it on the battery side....power from the ignition side....I can manually ground the relay it worked only with a jumper, and I also replaced it with a stancore no change....Swapped out the PCM to one i know works no change.....Does any one have a scmatic for that wire I belive it is also controled by oil temp switch through the pcm...it is below 50 in the morning whare is the oil temp switch...If i'm goining in the wrong direction stop me..
...thanks
...thanks
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Joined: Sep 2003
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From: North East Ohio
Just a ? but how have you determined that the GPR isn't working?
Did you run a 12v wire from battery to the GPR small terminal to see if it activates that way?
What do you mean you manually grounded it? If that worked, maybe it just needs a better ground??
Did you run a 12v wire from battery to the GPR small terminal to see if it activates that way?
What do you mean you manually grounded it? If that worked, maybe it just needs a better ground??
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Fleet Mechanic
Joined: Mar 2007
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From: Rio Rancho NM
IIRC I believe the GPR is turned on by the PCM by grounding one side of the primary. I think the other side of the primary is always hot. Both sides of the primary should have 12V on them when the relay is off because to DC voltage the primary winding is just a straight wire and the side that gets grounded is open. I put a GPR disconnect switch on the side that gets grounded. One side of the secondary side (big red cable) is always hot from the battery. When the GPR turns on the other side gets hot and supplies juice to the GPs. But with the engine off the voltage might be sucked down below 12V because those GPs use a lot of juice. Can you hear the relay clicking on? You should also see your voltmeter go way low when it turns on. If you can get it to turn on by grounding the side of the primary connected to the PCM, then for some reason it is not being turned on. I'd start by checking connections. I'm not sure about other inputs to the PCM that affect the GPR. Hope this helps.
Postmaster
Joined: Sep 2007
Posts: 4,195
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From: Medford Oregon
Sorry, got that wrong. Lets try again.
On my 97 ...
GPR small terminal Red/LTGRN goes through fuse #22.
GPR small terminal PPL/ORG goes to PCM pin # 102 and is pulled to ground by the PCM to activate GPR.
On my 97 ...
GPR small terminal Red/LTGRN goes through fuse #22.
GPR small terminal PPL/ORG goes to PCM pin # 102 and is pulled to ground by the PCM to activate GPR.
Fleet Mechanic
Joined: Aug 2007
Posts: 1,508
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From: The boonies by Dallas OR
Way to self correct.I'm using the power from the glow plug feed to run my camper charge solenoid, so I know that it turns on and off with the key switch.
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From: Boston
White smoke,hard start (cold), No drop in voltage key on,GP lite turns off instantly after key on,and last but not least I checked it with a volt meter,key on GPR does nothing.....
I have 12 Volts to the GPR with the key on
manually grounding means i ran a jumper to ground and it worked..wich bypassed the PCM that controles the GPR and makes it cycle If you just ground that termanal i belive the glow plugs will stay on .....
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Senior User
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From: Boston
I could do that but that would make my remote starter inop and the iditots at work woulnt understand and crank it to death...I would prefer to fix it so it cycles
Fleet Mechanic
Joined: Mar 2007
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From: Rio Rancho NM
Hopefully someone with knowledge of the temp sensor(s) that tell the PCM how warm it is will chime in. Sounds like the problem is in that area. Meantime you could wire in a momentary switch to ground the terminal the PCM is supposed to ground. If you do that, make sure the switch goes off when you release it, or your GPs will be on constantly until something burns up!
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From: Boston
I will check Fuse #22 and PCM #102 and report back.....
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