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Old 01-04-2009, 12:13 PM
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PCM Shorting

I have been having alot of fuel milage issues. and my truck has been throwing a soft code of system low voltage. Well new years day i went out to start my truck and the batteries where way down. So I hooked up the battery charger to it and and let it sit and trickle for a couple hours. went back out started it. it ran for a minute anda half kicked into high idle and all of a sudden died. ... so I got back into the truck clicked the key off then back on and my wait to start light wasnt coming on. so I checked the fuse and the 30 amp PCM fuse was blown. which kinda made me wonder. but a couple minutes past and i put in another fuse. The truck sarted and i was relieved. But about a minute later it died again. so im thinking WTF. put another in started it and pop. again. Now if you put the fuse in as soon as you tunr the key on to power the PCM is pops.
So I figure the PCM is shorting out. But did something cause this, if so what so i can remedy it.or is this a common problem with the PCM. Four of my buddies 7.3 Pcms have done the same things.
any Information would be greatly appreciated. Thanks
Jarod
My truck is a 99 f250 power everything,
And I think I posted this in the wrong spot. Sorry.....
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Old 01-04-2009, 12:20 PM
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unplug the fuel heater and then replace fuse
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Old 01-04-2009, 12:20 PM
allergic to hot weather

 

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on your fuel bowl, on the backside, near the bottom,there is a whte plug that is your fuel heater
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Old 01-04-2009, 12:21 PM
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Isn't the fuel bowl heater the same fuse??? If it is I would think that is your problem.

Edit: Posted at the same time so I guess it is the same fuse
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Old 01-04-2009, 03:14 PM
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ok ill try that and see where is get.
THanks fellas
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Old 01-05-2009, 05:40 AM
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Well I unhooked the fuel heater and the truck start and runs off a starter switch. But not by the key...... it never ends. The clutch switch is working and when you turn the key the relays activate but its not activating the solenoid. but if i use my push button start. which also uses the activation pole on the solenoid it will start....... what circuit am i missing here?>
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Old 01-05-2009, 06:56 AM
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got it fixed. Thanks for all Thehelp guy the heater is broke inside the bowl. Thanks again I have been pulling my hair out.
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Old 01-05-2009, 07:02 AM
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Glad you got it taken care of
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