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P0676 after PCM removal + p0683 GPCM

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P0676 after PCM removal + p0683 GPCM

  #1  
Old 09-24-2018, 11:07 AM
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P0676 after PCM removal + p0683 GPCM

appears the problem was GPCM failure, installed new GPCM

so I got a TS chip, tried to install, truck would not start. Figured it was the wrong PCM code. Anyway, took the TS out, re installed the PCM. Then check engine light came on. Code P0676. Truck then shut off. WTF is going on ? Is it possible the PCM is not seated ? Or is it the glow plug controller?
 
  #2  
Old 09-24-2018, 12:53 PM
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I'm going to pull the PCM and re install, see what happens
 
  #3  
Old 09-24-2018, 02:37 PM
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Clear codes and check again.

While I guess it's possible you tripped a glow plug code, it's probably more likely it's just a coincidence and you actually have a bad glow plug.

A few decades ago, while driving my 5.0 at night down the freeway, I lost my headlights. Bam, liked they lost power, they just shut off. Weird thing tho is my high beams still worked, so I clicked them on and finished getting home, a few minutes away. The next day when I went to tackle the problem, both head lights coincidentally had burned out at the exact same time.

Stewart
 

Last edited by Stewart_H; 09-24-2018 at 02:41 PM.
  #4  
Old 09-24-2018, 03:10 PM
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The PCM torque is strange at best for our trucks.

I too lost drivability after negotiating the chip install.

2 person job. One to shove and hold it thru the firewall, dude on top to align the connector thru the firewall.

Then torque it down. I tried to do it by myself the first time and found the firewall side not quite centered and that was the buffer that every time I crossed tracks, the truck would cut right off.

Proper way. Guy in engine bay. Seat the receiver, who-ever's inside, slide the pcm up the carriage to the reciever ginger like and wiggle a bit while you hold true on firewall side. Start cranking and than hit the torque spec which I can't pull off right now.

I was very wary not to overtighten but if you align the fire-wall-side with the body, you'll be in business.

Denny
 
  #5  
Old 09-24-2018, 03:12 PM
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Seth and I are swapping spit on the same chip as we speak. When you pull your PCM, What does your code say. XLE4 (I think or different) . E99's had a variant and won't work with the newer pcm.

Denny
 
  #6  
Old 09-24-2018, 04:15 PM
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I removed the PCM, installed, snugged down firewall side, it is secure. Unfortunaly on the second start up, the engine light came back on, #6 glow plug. Question is, is it the flow plugs or is it the GP module ? Should I replace all the plugs ?
 
  #7  
Old 09-24-2018, 04:54 PM
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Is the truck running OK now? One bad glow plug should not be a make or break issue. If you are getting codes for a specific glow plug I assume that you have a Cali truck or an EX so you might have four (or all of them) GP's that are not working.
 
  #8  
Old 09-24-2018, 04:58 PM
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Originally Posted by hydro man 17 View Post
Is the truck running OK now? One bad glow plug should not be a make or break issue. If you are getting codes for a specific glow plug I assume that you have a Cali truck or an EX so you might have four (or all of them) GP's that are not working.
It starts right up (I mean fast) and idles good. Maybe I should pull the GPCM and clean it real good? Just weird this happened right after I pulled the PCM out.
 
  #9  
Old 09-24-2018, 05:00 PM
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Change all on the same side at the same time. That is my advice. If one is bad, the rest should follow.
 
  #10  
Old 09-24-2018, 05:01 PM
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You can ohm out your number 6 GP really quick and double check it. The GP module pops its own code if it is having a problem, I wouldnt replace all the GP's just check 6 with a meter.
 
  #11  
Old 09-24-2018, 05:06 PM
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Other than the actual plugs I think the the GPCM is a sealed unit. I had a similar issue after working under the hood myself. Replaced the module and when I did it looked like one of the two plugs was cockeyed so I really don't know if it was bad or not.
 
  #12  
Old 09-24-2018, 05:34 PM
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So. after the chip was installed, you get this signal and the trucks running great aside from the gp read.


Unplug the neg side of your batteries overnight and let's see what sparkles in the morning.

One thing we haven't touched on is, when were you're glow plugs replaced? And what flavor.

This thing might not be lying.


Denny
 
  #13  
Old 09-24-2018, 05:59 PM
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Originally Posted by DieselDenny View Post
So. after the chip was installed, you get this signal and the trucks running great aside from the gp read.


Unplug the neg side of your batteries overnight and let's see what sparkles in the morning.

One thing we haven't touched on is, when were you're glow plugs replaced? And what flavor.

This thing might not be lying.


Denny
Just got the truck, not sure how old they are.

so on the driver side harnes plug, which pin is #6? I'm gonna Ohm it out.
 
  #14  
Old 09-24-2018, 06:35 PM
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Spell

From the 9 pin connector on the valve cover, the second pin from the back is number 6.
 
  #15  
Old 09-24-2018, 06:37 PM
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I believe that Rich (Tugly) has a photo showing the pin designations in hie sig.
 

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