Bad PCM?
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Bad PCM?
I have a 2002 F350 7.3 Auto. Today when I started the truck to let it warm up about 10 min of idling the truck died. So I did some testing and my glow plug relay was stuck on and I think the reason is my batteries are getting weak the low voltage/high amperage made the relay stick and drained my batteries killing my truck. I removed the relay and fired the truck up and it was idling fine. So i ran to town and picked up a new glow plug relay and a set of new batteries. While installing the new GPR I accidentally touched the PCM ground to the hotside of the GPR. Now after new relay and batteries installed the truck will crank but no start and it's not getting any fuel there is no smoke out of the exhaust. Im confident when I touched the PCM ground on the relay the 12v lug I have messed something up but I have tested all fuses and relays and they are all good and I have excellent voltage while cranking. Could I have fried my PCM??? Has anyone else done this? I only found one post on the diesel site about this and the person did the exact same thing i did and had the exact same crank with no start as me but never posted the solution. I need to get my truck running ASAP so any advice would be greatly appreciated. Thanks
Logistics Pro
Joined: May 2017
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From: Muskogee, Ok
In theory there is a diode protecting the PCM, but that's on the positive power side, +power thru the ground trigger wire, not good. When you turn the key to run before cranking does the wait to start light come on?
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Joined: Nov 2015
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From: Colorado Springs
If you think your PCM is bad you can send it here, Jonathan does great work.
https://www.dieseltechchatt.com/pages/warranty
https://www.dieseltechchatt.com/pages/warranty
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Yes, the (WTS) coil spring light comes on for about 10 seconds then shuts off. I have done everything I can think to try and nothing is firing it up. I am supposed to leave Indiana in 5 days to head to Florida for an excavating job and this is our fuel truck I have to figure it out. I am going to get the part number off the PCM today. I have read that PCM have to be exact year and part number but what about IDM? Will all superduty years work for it? Thats about the only 2 things I can think of that might be causing my problem now. I have searched google for hours and I have found 2 guys that did the exact same thing as me and both had the exact same problem but neither of them posted the solution! Its driving me crazy.
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I pulled my PCM and it is a VDH2. How do I know what other PCM's are compatible? I found another online off of a 2002 f250 7.3 identical to my truck except mine is a f350 within driving distance but it is a KEK2. Will that work?
Hotshot
Joined: Mar 2014
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From: Douglassville, PA
IDM's for our series come in two versions, a 110V and 120V and either will work, 120V is what yours has in it and would work better. PCM's are interchangeable to an extent but I don't know which ones will work for you. I do know that you'll need one that matches what your trans is, manual vs automatic.
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I pulled the PCM and opened it up, it smelled like burnt wires soon as i cracked it open and had 2 small components that looked like they had been hot and melted. I found a guy up by Chicago that had a KEK2 and from what I have read it looks like it will cross with my PCM. Super nice guy he shipped me his PCM free of charge and if it works told me to send him money and if it doesn't he said just ship the PCM back. Nice to run into a good ole boy in the day and age. I will keep you posted on if this fixes it. Thanks
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It's a Van Gogh
Joined: Feb 2010
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From: Elk Grove, CA
I pulled the PCM and opened it up, it smelled like burnt wires soon as i cracked it open and had 2 small components that looked like they had been hot and melted. I found a guy up by Chicago that had a KEK2 and from what I have read it looks like it will cross with my PCM. Super nice guy he shipped me his PCM free of charge and if it works told me to send him money and if it doesn't he said just ship the PCM back. Nice to run into a good ole boy in the day and age. I will keep you posted on if this fixes it. Thanks
The attached PDF shows the various PCMs, and yep the KEK2 (lol!) is for auto trans and GPR. Also shows as clean fuel fleet vehicle but I don't think that matters.
Sounds like you got a good deal there!
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From: Colorado Springs
I pulled the PCM and opened it up, it smelled like burnt wires soon as i cracked it open and had 2 small components that looked like they had been hot and melted. I found a guy up by Chicago that had a KEK2 and from what I have read it looks like it will cross with my PCM. Super nice guy he shipped me his PCM free of charge and if it works told me to send him money and if it doesn't he said just ship the PCM back. Nice to run into a good ole boy in the day and age. I will keep you posted on if this fixes it. Thanks
Banned
Joined: Dec 2018
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I pulled the PCM and opened it up, it smelled like burnt wires soon as i cracked it open and had 2 small components that looked like they had been hot and melted. I found a guy up by Chicago that had a KEK2 and from what I have read it looks like it will cross with my PCM. Super nice guy he shipped me his PCM free of charge and if it works told me to send him money and if it doesn't he said just ship the PCM back. Nice to run into a good ole boy in the day and age. I will keep you posted on if this fixes it. Thanks
It's a Van Gogh
Joined: Feb 2010
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From: Elk Grove, CA
I'm curious, what numbers do you have? Maybe post up a pic on a new thread.
1st Gear
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No start issue
I have a 2002 F350 7.3 Auto. Today when I started the truck to let it warm up about 10 min of idling the truck died. So I did some testing and my glow plug relay was stuck on and I think the reason is my batteries are getting weak the low voltage/high amperage made the relay stick and drained my batteries killing my truck. I removed the relay and fired the truck up and it was idling fine. So i ran to town and picked up a new glow plug relay and a set of new batteries. While installing the new GPR I accidentally touched the PCM ground to the hotside of the GPR. Now after new relay and batteries installed the truck will crank but no start and it's not getting any fuel there is no smoke out of the exhaust. Im confident when I touched the PCM ground on the relay the 12v lug I have messed something up but I have tested all fuses and relays and they are all good and I have excellent voltage while cranking. Could I have fried my PCM??? Has anyone else done this? I only found one post on the diesel site about this and the person did the exact same thing i did and had the exact same crank with no start as me but never posted the solution. I need to get my truck running ASAP so any advice would be greatly appreciated. Thanks
Check to see the idm injection drive module in the left inner fender well is getting power first if not if start there if you swap and still nothing yes pcm and ecm are bad and won’t send proper signal but I couldn’t see them frying that easily but anything is possible