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Glow Plug Mod

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Old Dec 8, 2020 | 03:57 PM
  #1  
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Glow Plug Mod

Can anyone tell me if there is a way to test the individual glow plug output circuits at the module on the 6.0? I have new glow plugs as well as new left and right side harnesses that all test good. The main harness also tests good between the module and the new L & R harnesses. I hate being a parts changer without knowing for sure that module is bad.
 
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Old Dec 8, 2020 | 04:14 PM
  #2  
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Are you getting codes?
 
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Old Dec 8, 2020 | 04:25 PM
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If everything is new from the module to the plugs then I would check the positive wire off the pass battery to the module for power and then the only thing left would be the module its self imo...

 
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Old Dec 8, 2020 | 05:25 PM
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Yes, I get P0676 and 678. everything is good from the mod through the plugs.
 
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Old Dec 8, 2020 | 05:26 PM
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Battery connections are good and I have power to the mod.
 
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Old Dec 8, 2020 | 05:31 PM
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If the plugs and harness test fine and only have two glow plug codes, it has to be the module. They occasionally go bad.
 
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Old Dec 8, 2020 | 05:45 PM
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ok. I was hoping for some info on how to test the mod. Voltage outputs at each terminal and such?
 
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Old Dec 8, 2020 | 05:59 PM
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Condemn the GPCM by the process of elimination ......
 
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Old Dec 8, 2020 | 06:05 PM
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I would think that if you turn koeo you will get power to each of the pins feeding your glow plugs. Then the module will shut off after cylinders get to 60 70 ° .
Check the pin on the one you have codes on versus one you don't. See what happens.
 
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Old Dec 8, 2020 | 06:16 PM
  #10  
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Sounds like a plan. I'm assuming 12V?
 
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Old Dec 8, 2020 | 06:23 PM
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The glow plugs will not be activated if the oil temp is above 130 .... (fyi)
 
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Old Dec 8, 2020 | 07:04 PM
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Here ya go maybe this will help.
 
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Old Dec 8, 2020 | 07:16 PM
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Helps more.
 
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Glow Plug Circuits.pdf (2.79 MB, 56 views)
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Old Dec 8, 2020 | 07:22 PM
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Thanks Jack.
That'll help me in the future and add to my diagram collection.
 
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Old Dec 9, 2020 | 03:32 AM
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I had a #1 plug that would show a code and after putting a new one in and checking the harness
was still getting a DTC telling me it was bad. Dropped in a known good GPCM the problem went
away and never came back.
 
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