GPR Issue Has Me Stumped
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8th Gear
Joined: May 2011
Posts: 8
Likes: 0
From: Bar Nunn
GPR Issue Has Me Stumped
The housing of my GPR recently broke and the 12V lug pulled out shorting my alternator. Ended up replacing the alternator and GPR with a Stancor. Now the issue is this, the new GPR will not turn on.
Before I get into what I have tried alittle on the truck:
Verified
Before I get into what I have tried alittle on the truck:
- 2001 F350 Manual 249k daily driver
- AIH delete with 470 ohm resistor for code eliminator
- EBPV delete w/ code eliminator
- Hydra chip
- Stage 1.5 power package from Jellibuilt
Verified
- Constant 12 VDC from battery to one side of relay switch
- 12 VDC to one side of relay coil
- KOEO no change to relay state (expect relay to trigger and 12VDC to glowplugs)
- 0.3 ohms PCM pin 101 to coil of relay (wiring PCM to relay good)
- EOT 47 F ECT 41 F (less 10 degrees temp diff)
- Fuses good
- Jumper 12VDC across GPR coil glow plugs turn on (new relay good)
- Unplugged EOT, no change (expected a default value)
- Removed Hydra, no change
- Disconnected the AIH relay power to make sure I didn't have a draw there, no change.
- Is there anything else I should try?
- I have autoenginuity with the Ford modules. Is there a way to tell the PCM to turn on the GPR to verify I have a ground signal from the PCM?
Butt-Head
Joined: Apr 2004
Posts: 9,448
Likes: 2,934
From: Reed Point, MT
Is there a possibility that the heavy gauge wire from battery power feed on the glow plug relay momentarily touched the ground-side wire (control side from the PCM) on the relay? If so, the low-side driver in your PCM is fried.
This happens a lot and is the reason the batteries should be disconnected while replacing the relay. IF this scenario is your case, you have options. Install a push-button relay control switch, buy a replacement PCM, or contact a place like Diesel Tech Chattanooga and see if this is a repair they can perform.
This happens a lot and is the reason the batteries should be disconnected while replacing the relay. IF this scenario is your case, you have options. Install a push-button relay control switch, buy a replacement PCM, or contact a place like Diesel Tech Chattanooga and see if this is a repair they can perform.
Thread Starter
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8th Gear
Joined: May 2011
Posts: 8
Likes: 0
From: Bar Nunn
Is there a possibility that the heavy gauge wire from battery power feed on the glow plug relay momentarily touched the ground-side wire (control side from the PCM) on the relay? If so, the low-side driver in your PCM is fried.
This happens a lot and is the reason the batteries should be disconnected while replacing the relay. IF this scenario is your case, you have options. Install a push-button relay control switch, buy a replacement PCM, or contact a place like Diesel Tech Chattanooga and see if this is a repair they can perform.
This happens a lot and is the reason the batteries should be disconnected while replacing the relay. IF this scenario is your case, you have options. Install a push-button relay control switch, buy a replacement PCM, or contact a place like Diesel Tech Chattanooga and see if this is a repair they can perform.
And to answer your other question 100% sure it's #16-009 White-Rodger (Stancor 586 902)
Butt-Head
Joined: Apr 2004
Posts: 9,448
Likes: 2,934
From: Reed Point, MT
I have never installed one of those flavor of the week aftermarket relays so I don't have any experience with them. I know it's something other people have done and not have issues with so it must be okay.
Laughing Gas
Joined: May 2024
Posts: 908
Likes: 290
From: E TN
Pretty simple operation 12v on 1 small terminal and the PCM controls the ground on the other small terminal side of the solenoid. If you have the solenoid hooked up and use a test light connected to ground you should be able to touch the small terminals and 1 should have power and the other will make the solenoid click and energize. Once that works it's all on the PCM and it's ability and it's wiring to turn the solenoid on.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
I've been using the AIH relay as a glow plug relay with a manual push-button switch on the dashboard for nearly two decades now. They are physically larger than the glow plug relay and wired exactly the same. So far, so good.
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