low voltage-ficm - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 6 (permalink) Old 04-13-2015, 12:47 PM Thread Starter
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low voltage-ficm

What is it about low voltage that mess up the ficm, ive run batts down several times in past from lights,key on,doors open,trailer acc left on,bad batts,bad alt and ive noticed my ficm has gotten a little lower readings at times, whats the lowest reading youd wanta see to repair or replace?
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post #2 of 6 (permalink) Old 04-13-2015, 01:11 PM
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Re: low voltage-ficm

Usually anything under 48v would need a replacement. The replacement boards from Dorman do well for a stock replacement. They are guaranteed and you dont need to reprogram the FICM when changing them.
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post #3 of 6 (permalink) Old 04-14-2015, 01:31 PM
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Re: low voltage-ficm

45v is the must change now limit. Normal voltage is between 47 and 49. The ficm is two parts. One part is the logic part and creates the pulse to run the injectors. The second part is the amplifier. It takes the pulse and kicks it up to the amount needed for the injectors. When you are supplying low voltage it has to kick it up too much and is speculated that it is hard on the ficm. Other speculate that low voltage is not the problem but vibration is the problem and eventually the vibration of the engine will take it out. Some will move the ficm off the engine (back end of drivers side valve cover) and mount it on the firewall. I have not heard if it makes a difference plus since there isn't a wiring harness you would have to make one yourself and it doesn't seem to be worth the trouble. You can go high end and get one from eds ficm repair (FICMrepair.com) and they say it will last or you can go cheap and get it from your local international truck dealer. I go with the international route. Do some research and you will find out how to remove the ficm and pull the two halfs apart. Take the amplifier half with you (like a $300 core if you don't have it) and just put the new one in. The logic half rarely goes bad. Less then $200 going the oem (international) route. It is an International part so they will have them in stock. The only catch you can't go in and ask for a part for the 6.0 they will say it doesn't fit and you can't do it. Ford (imho) has asked international not to sell parts to ford owners (nice profit for ford in each part they sell). They call it an injector driver module (IDM) and the number is 5010598R92 but the last number may be different as they update the part. Good luck. It isn't hard to do but do some research first to learn the tricks needed to make it somewhat painless. Make sure not to drop any of the bolts. They are not easily available. ...and do not bend any of the pins in the wiring harnesses if you do you will be very unhappy... If by chance the truck misses or runs poorly go back and check your harnesses. There are three. One for the right bank of injectors, one for left bank of injectors and the main connection to the truck. It is easier to plug them back in by laying the ficm down on top of them and with you hands on both sides reach around with your fingers tips and clip them in. They can only fit one way. You can't easily plug them in with the ficm on its side. They will make a solid snap sound when they lock in. Should take less then an hour to change it. To change the board, there is a window on the ficm. Remove the window and you will see 4 bolts. Remove the nuts, this is the electrical connection between the logic and amplifier boards. Once you do this then just remove the screws around the case and pull apart. Take the half that the truck harness does not plug into. International will give you a new half (board and 1/2 case). Just go back align the case and put the case screws back (O-ring seal around the case). The last thing you do is the 4 board screws (under the window). Then put the window back. Put back into the truck. It should run fine after that. If you have an 03 or very early 04 you might find 7 screws under the window. Then you need to either replace the whole ficm (plus get it programmed) or send it out for repair. There are no replacement boards for a 7 screw ficm. Most try to stay away from the Dorman part. It probably works fine but for not too much more you can get the international half shell. That is the route i would go but if you are in an area where there isn't a international truck shop and can't afford ford then the Dorman will get you back on the road. You do the same thing as you do with the international part but the Dorman is just the board. So you have change the board in the half shell. Not complicated and the above instructions will work just fine. You just need to change the board rather then take it to the dealer.
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post #4 of 6 (permalink) Old 04-14-2015, 04:47 PM
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Re: low voltage-ficm

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post #5 of 6 (permalink) Old 04-15-2015, 01:20 AM
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Re: low voltage-ficm

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post #6 of 6 (permalink) Old 04-15-2015, 03:56 AM
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Re: low voltage-ficm


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