OBD II code fix? - Ford Powerstroke Diesel Forum

 
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post #1 of 5 Old 09-11-2008, 02:56 PM Thread Starter
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OBD II code fix?

Hey all of you psd experts I need your help. My '99 7.3's check engine light came on again. I plugged in the scanner and It threw P1391 - Glow plug circut low input (Bank #1) and P1393 - Glow plug circut low input (Bank #2). What does this mean in laimens terms. Also what exactly do I need to change to fix this. Thanks for your help.

Thanks again'
Adam
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post #2 of 5 Old 09-15-2008, 12:07 PM
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Check the UVC harness coming off each valve cover, pull apart the connection and look for any burn't terminals. I would also take a multi meter and check the GPR.

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post #3 of 5 Old 09-15-2008, 02:24 PM Thread Starter
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Hey first off i'd like to say thanks for the info. What is the GPR suppose to be at, and what is GPR
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post #4 of 5 Old 09-16-2008, 03:56 AM
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GPR= Glow Plug Relay It is located just to the left of the fuel bowl and looks like a starter relay. There will be two of them, the one in the front is the fuel heater the one to the rear is the GPR it will be a round brown colored relay with two larger posts and two smaller ones. With Key on you should have 10.5 -12 volts on both large posts. If not your GP's are getting power.

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2000 F350 DRW,CC,LB, 4X4, Western Hauler Pkg.
Ford AIS/ BTM, FTVB
My CCV MOD, Coolant filter
06 Grill, 05 lights,6.0 trans cooler
Cyro/Hawks, JVC Touchscreen HU, JL C5's, Infinity 800watt amp,
DP tunes, 60 tow/80 e/120 race, on a SCT2 tuner
P3 controller, Brite Box Turbo Lifesaver
KMC Wheels x 4

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post #5 of 5 Old 09-16-2008, 10:08 AM Thread Starter
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Thanks I appreciate your time
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