PCM Problem? - Ford Powerstroke Diesel Forum
 
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post #1 of 8 Old 03-05-2014, 06:39 AM Thread Starter
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PCM Problem?

I have read through some of the older threads on this problem, and think I have a bad PCM. Went to replace batteries, they were not bad yet, but I had a new pair. Started up truck, washed off top of the batteries, and sprayed off the dirt everywhere inside of the engine compartment while I was at it. Walked over to turn off hose, engine died. No wait to start light, knew it was electrical, waited a week until all was dry, checked fuses, PCM Power supply fuse blown, replaced, went to start, blew fuse. Replaced PCM relay and fuse, blew fuse. What do you think, Blown PCM?
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post #2 of 8 Old 03-05-2014, 07:09 AM
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No, a "blown PCM" doesn't "blow Fuses"..

You should post the year of your truck and the fuse # BUT I'm gonna guess it's fuse #30

If so, what you need to do is to unplug the Fuel Heater Element at the bottom of the Fuel Bowl and the fuse will stop blowing. You actually don't need that heater anyway so, if you want to replace it, you can wait and do it at anytime.

If not #30 post what yr/# it is...
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post #3 of 8 Old 03-05-2014, 08:37 AM Thread Starter
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Duh, Yea, I guess that would help, 2000 F250, 132,000 mi, blown Fuse #24, PCM Power, Switched out #30, PCM Power Relay.
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post #4 of 8 Old 03-05-2014, 10:18 AM
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Fuse 24 has nothing to do with your pcm

24
10A A/C Clutch, Blend Door Actuator, Trailer
Tow Battery Charge Relay Coil, Four Wheel
Anti-Lock Brake System (4WABS), Turn
Signal

So it being blown is not the cause of your no WTS light

Please check out my 7.3 Enthusiast Facebook group! All are welcome! LINKY

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post #5 of 8 Old 03-05-2014, 11:51 AM
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Still, unplug the fuel bowl heater and replace your fuses and try again.

2005 F250 CCSB FX4 6.0
2003 Excursion 6.0 4WD
1997 F350 CCLB 4WD 7.3
1996 F250 SCLB 4WD 7.3
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post #6 of 8 Old 03-05-2014, 01:27 PM Thread Starter
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Fuses

Thanks for the replies, I will unplug the fuel heater on the fuel bowl tonight, it just pulls out of the socket I guess. The #24 Fuse that I am blowing is the BIG 20Amp fuse that is in the Fuse/Relay box in the engine compartment, listed as PCM Power Supply in the Owners Manual, and the #30 relay that I swapped out with a new one is also in the box under the hood. In the cab, where the little fuses are, I checked each fuse by pulling them out, one by one and looking at them. The little #30 fuse, PCM Relay Coil, I also checked with a volt/ohm meter to make sure it is good. Thanks for the help, Frank
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post #7 of 8 Old 03-06-2014, 01:26 PM
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Yeah, its a white plug on the back side of the fue bowl.

2005 F250 CCSB FX4 6.0
2003 Excursion 6.0 4WD
1997 F350 CCLB 4WD 7.3
1996 F250 SCLB 4WD 7.3
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post #8 of 8 Old 03-09-2014, 05:40 AM Thread Starter
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Thanks Peter, it looks like I have another issue. I went to unplug the Fuel Bowl Heater plug and saw that it was already unplugged. While looking around on top of the engine, I noticed two wires disconnected on what looked like a relay, so I went page by page through the Haynes Manual until I recognized it in a picture. It is my Glow Plug relay!!! Maybe a wire shorted out when I had the engine running and hosed of the engine compartment. It is usually warm here, and I guess that the engine did not require the glow plugs to start. It was a couple of years ago that I had a guy work on this when I had a similar problem with the engine not starting, he must have disconnected the relay, and forgot to hook it back up. I'm sure that the studs are metric, and will have to get down to the hardware store and pick up some nuts. Really wished that this truck would start, yesterday I had to use the F550 to run to Laredo and pick up a utility bed on a trailer and haul back, kind of overkill, and with it having a 488 rear end, the 6.0 is not fuel friendly.
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