Ficm voltage question...67-68 volts? - Ford Powerstroke Diesel Forum
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Old 07-04-2014, 03:30 AM
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Ficm voltage question...67-68 volts?

Hello all. I'm working on my 05 truck right now as it has finally quit on me. I went to start it first thing in the morning, and it started as usual. It has sticky injectors so it's always a little loopy on start up. After that I went to get fuel, same place I always get fuel, and I started it up again. No problem. Then about 2 mins later as I'm driving down the street, I look out my mirror and notice its smoking blue more than normal. So I let off the pedal, and it's still smoking. When I got to my buddies house, it was now a mosquito fogger at idle, and when I tried to give it throttle, it just loaded right up. I was about a mile from home and barely made it.

When I had time to look at it, I suspected a stuck open injector. Or a turbo seal, or ficm. So I checked the turbo, and it was all good. Pulled the glow plugs and none of them seemed to spew out gobs of diesel. So I also tested the ficm and it came in at 67-68 volts KOEO and while cranking. I have never heard or read about one being too high. Is that possible?
Thanks
Clarence.

Last edited by 03ccf350; 07-04-2014 at 03:54 AM. Reason: Stupid autocorrect!
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Old 07-04-2014, 03:33 AM
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Send a message via Yahoo to Dave
68 volts? Ask the owner if it ran before someone botched the FICM voltage mod
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Old 07-04-2014, 03:39 AM
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Sorry, forgot. It has an EGR delete, and a programmer for the egr valve missing. I have up to this point had a CEL on for my oil cooler temps which I have a new one ready to go in so I knew about that one. I tried to get any codes, but I only have a really cheap scanner and it brought up nothing.
Clarence
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Old 07-04-2014, 03:41 AM
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Sorry, Dave it's my truck. Have not updated my sig. My other truck got stolen and I bought this one cheap a couple years ago. I kinda thought someone might have screwed around with it, but I bought it from an older farmer, and can't see him playing with it. But, I can open it up to have a look.
Thanks for the speedy reply!
Clarence
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Old 07-04-2014, 06:03 AM
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Just did a voltage test on the batteries. Came in at just over 17 volts which is REALLY weird. Both batteries are just under 2 years old. Not that that makes a difference. But, 17 x 4 is 68. Which might explain the voltage the FICM is putting out. But where in the heck did 17 volts from a 12 volt battery come from?!
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Old 07-04-2014, 06:41 AM
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Fixed your topic title, Clarence... Yeah, it definitely sounds like something is wrong with one or both of the batteries... It shouldn't ever be that high which sounds like the internal resistance (to maintain voltage regulation) is borked... You might take the batteries and see if they will test them for you.
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Old 07-04-2014, 07:33 AM
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Yeah thanks Shawn. I tried after I saw it and couldn't. Friggin auto correct! I talked to a couple sparky buddies and they said the same thing. I will add that the batteries are wet in top and have been for about a year and a half. So a chronic overcharging problem? I replaced te alternator at the same time as the batteries. What controls the charging voltage? The ecu or the alternator or? As far as I understand, the ecu controls the input voltage to the alternator, thereby controlling output. Correct me if I'm wrong.
Having said that, is it possible to have slowly fried the FICM and finally it called it quits? I am going to open it up after work to have a better look at it. And in te mean time, test the batteries.
Thanks
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Old 07-04-2014, 07:44 AM
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the internals of the alt control charging plus there should be a light on the dash for overcharge

what are you testing with ?
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Old 07-04-2014, 08:11 AM
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Testing voltage? Using a fluke multimeter. No light on dash for charging fault. I may have to get a better scan tool as I had a code for my oil coolant delta out of spec, which this piece of junk didn't pick up. I will check again when I get back home with my flashpaq. Which came with the truck, BTW! I know it's not the best thing out there, but the whole truck was cheap so I can't complain. Besides, I spent all my money on my last truck only to have someone think they needed it more than me.
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Old 07-04-2014, 08:57 AM
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i would have to test another 12v circuit with the fluke or use another tester on the truck
to verify such a whak reading
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