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glow plug control module

 
  #1  
Old 11-10-2014, 06:07 PM
croweyes
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glow plug control module

2002 ford super duty 7.3. where is glow plug control module located. can anybody help?
 
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Old 11-10-2014, 06:56 PM
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Just above the passenger side valve cover next to the AIH relay.






It's the aluminum colored rectangle box with 2 square plugs attached to it. Note: Only CA emissions trucks have a GPCM. The rest of them have a GPR.
 
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Old 11-10-2014, 07:45 PM
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2002 7.3 glow plug module

since mine doesn't have a module (federal emissions) are the left bank and right bank glow plugs are controlled by the pcm? Also i replaced the the gpr twice and the big terminal going to the glow plugs doesn't have power when the ignition is on.
 
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Old 11-10-2014, 08:22 PM
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On a 2002, you have two relays next to each other. Make sure you're testing the right one. The PCM sends a ground signal to the glow plug relay to activate the relay and send power to the glow plugs.

Test the small posts on the GPR to see if you're getting a ground signal to one of them when the ignition is first turned on to see if it's a signal issue or a bad relay. (If you unplug the engine oil temp sensor first it will cause the GPR signal to be sent for two minutes giving you more time to test)
 
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Old 11-10-2014, 08:26 PM
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well both small wires on the gpr are showing 12 volts with ignition on
 
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Old 11-10-2014, 08:28 PM
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Engine cold? Glow plugs won't be activated if the engine temp or outside temp is warm enough.
 
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Old 11-10-2014, 08:32 PM
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won't star in cold weather, white smoke is showing when trying to start. took it to a mechnic his dyno showed bad pcm, gpr and left bank glow plugs not firing.
 
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Old 11-10-2014, 08:55 PM
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Lay a screwdriver across the two large posts for 30 seconds when it's cold out to power up the glow plugs.

Next, a dyno, or even a scanner is not going to tell you the passenger side bank of glow plugs is not working. There's nothing in the wiring or PCM to read that data.
 
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Old 11-10-2014, 08:59 PM
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k ty would you buy a pcm for a start?
 
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Old 11-10-2014, 09:03 PM
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Ummm... I suppose a loose UVCH would show one bank of glow plugs out, but I'd think you'd have other problems if that were the case.

Mark
 
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Old 11-10-2014, 09:06 PM
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well the pcm wire harness is kinda wonky on the firewall at the pcm
 
 
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