Ignition on warm up issues - Ford Powerstroke Diesel Forum
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  #1  
Old 10-21-2013, 06:28 AM
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Ignition on warm up issues

On my trip to Bowling Green last week, I started having an issue with my truck popping multiple codes after I start up.

They are all dealing with the warm up at start. Glow plug circuit, manifold warm up etc. There are between 4 and 6 codes.

My wait to start comes on, but I noticed that my voltage was not dropped from the glow plugs drawing current after the motor was running. I would normally see a voltage around 12.4 or so for some 25 - 30 seconds and then kick up to 13.8V.

I have a GP solonoid in my Excursion like a 99 F250. When I looked this part up, the books show a module for my 2000 EX, and I am not equipped with that ONLY at least.

I have not checked the solonoid yet for signal to to activate it, but will try to later when I have time. I was looking for ideas of anything else I may need to inspect if it is not getting the signal to push power to the glow plugs.

I clear the codes right away and no others codes will appear until the motor is shut of and started again. The CEL comes on about 4 seconds after ignition fire off.




Thanks in advance for any help,
Mike

Last edited by beamer; 10-21-2013 at 06:31 AM.
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Old 10-21-2013, 09:24 AM
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I thought all Ex's came with the GPCM. That's what I get for thinking.

What battery voltage are you seeing, before and after startup?

Saw this on another forum:

Quote:
Ran into this a time or two in my shop. First time it was the PCM that was faulty, second time it was wiring in the main harness leading up to the 42 pin connector not actually the engine harness.

Quick test is to pull the small wires off (so that one doesnt power the other thru the relay) and see if both have power when the key is turned on. If so then powers coming from the PCM and wiring good if not onto testing the harness

Find a good wiring diagram and then test resistance in the two activation wires from at the Glow Plug Relay all the way to the associate pin at the PCM plug at the firewall (pull the plug DONT PROBE!) is how I test them. If both wires are good then you're only left with a fault bus circuit in the PCM or a magical gremlin
I think that will be a quick and easy way to determine if you need to change out the PCM.
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Old 10-21-2013, 11:35 AM
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I believe I found my problem. Freaking rat bastards !



Mike
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Old 10-21-2013, 12:23 PM
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That very well could be the issue.
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  #5  
Old 10-21-2013, 02:43 PM
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All fixed !

3 wires chewed up and connected back.



Mike
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