2005 6.0 glow plug problem

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Jun 1, 2013 | 01:27 PM

bneafus

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Joined: Jan 2006

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From: Aurora,CO

2005 6.0 glow plug problem

I am pulling codes p0671-p0678, basically the glow plugs for all cylinders. Is there a control circuit for these? I now have an oil pan heater which helps it start, but would like to not have to depend on this.
Thanks in advance. Brian

Jun 1, 2013 | 01:57 PM

Rusty Axlerod

Lead Driver

Joined: Feb 2011

Posts: 8,241

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From: L.A. (Lower Alabama)

Not a whole lot of help but the glow plug control module is on the passenger side valve cover just behind/ below the alternator. It has two plugs one black and one green. Wish I had a print for you but you should find power to it in there somewhere and power out for each plug for a minute or so after key on. I couldn't find a fuse so it likely has a fusible link on a big fat wire somewhere. The module it's self could also be the problem. All 8 plugs failing at the same time isn't likely.

Jun 1, 2013 | 02:54 PM

bneafus

Thread Starter

Elder User

Joined: Jan 2006

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From: Aurora,CO

That actually helps a lot! I figured it was the module too, just didn't know where it was. I'll do some testing. Thanks Buddy for taking the time..

Jun 1, 2013 | 07:13 PM

mhoefer

Postmaster

Joined: Jan 2005

Posts: 4,424

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From: BC Canada

Probably glow plug relays are melted. It's quite common to have to do both sides GP relays when replacing GPs. You can try the relays first, but chances are depending on mileage, you need both relays and 8 new Hot Sticks. Tech manual shows how to do them, you have to pull the inner fenders to get in there. You are going to have some serios bonding time with the 6 oh.

Jun 2, 2013 | 03:50 AM

Yahiko

Fleet Owner

Joined: Apr 2012

Posts: 27,307

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From: Spanaway

The 6.0 does not use a relay is electronic and reports status back to the
ECM so it can let you know what the problem is. I have a post I did with
a break down of the wiring.
You can find it here
https://www.ford-trucks.com/forums/1...ce-manual.html

Here is the stuff I found when I did that post.

Quote:

Originally Posted by Yahiko

All this information comes from the 2006 Service Manual.

Glow plug on time is dependent on oil temperature and altitude. The GPCM will
command the glow plugs on for 1 to 120 seconds. The GPCM does not operate
if the oil temperature is above 55C (131F)
It looks like the GPCM is really 2 units in one box.
Glow plug to ground 0.1~2 Ohms
Glow plug connector to GPCM connector Less that 5 Ohms

Pin #3 on both is the VBattery

Green connector
pin #1 is gp#5
pin #2 is gp#7
pin #6 is gp#1
pin #7 is gp#3
pin 8 goes to the PCM
pin 9 goes to the PCM

Black connector
pin #1 is gp#6
pin #2 is gp#8
pin #6 is gp#2
pin #7 is gp#4
pin 9 goes to the VPwr

Enjoy

Sean

Sean

Jun 2, 2013 | 08:36 AM

barkwill

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Joined: Jun 2013

Posts: 6

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From: Niagara Falls, ontario, C

6.0 glow plugs

pin 9 on the glow plug relay should have battery voltage when key is on, no matter what, (small red wire), the white/light green and violet/orange are grounds supplied to gpcm to energize, if you have both of these inputs, it should be working, make sure the fuse links arent open and the connectors are properly clipped in at harnesses. if its setting a p0683 also, id replace the module. both connectors are the same.