Rebuilt FICM now codes say #5 and 8 low ckt - Ford Powerstroke Diesel Forum
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Old 10-27-2013, 11:32 PM
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Rebuilt FICM now codes say #5 and 8 low ckt

Hello everyone, this is first post in here and rusty at this. Here's the story and I really appreciate any help.
I just purchased a late model 04 6.0 with 125K, ran perfect, but check engine light was on. Put the scanner on it and it showed all 8 cylinders low voltage. So we have the FICM rebuilt by someone here local, they said someone had been in there before and radio shacked it real good, but they still rebuilt it and said it was fine. Installed it and started the truck it ran really bad missing horribly and would hardly move. We scanned it and codes came up showing #5 and 8 cylinder imbalance and low ckt. I replaced #5 injector only and started the truck. It seemed to run really good and no CEL, but once it warmed up started running bad but not as bad as it did before I replaced the one injector and also CEL came back on. I checked it for codes and it still says #5 injector low ckt and cylinder imbalance and also shows it for #8.

Wondering if you have any suggestions please help, thanks.
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Old 10-28-2013, 06:39 AM
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So this doesn't make sense. Runs well but low codes on all cylinders. You only fix the FICM (assuming it tested bad) and now it runs worse. The engine contribution test (if done) should have shown the bad cylinder even with the FICM being bad (even if the FICM was causing the problem). I would have said to check you connections to the FICM are secure. But now you have muddied the water by changing out an injector. That rational does not make sense. I would have said to recheck your FICM was in fact fixed correctly!

So, if your FICM is now working properly and you now have new found faults, carry on with your diagnosis and repair.
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Old 10-28-2013, 07:26 AM
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Thanks for your thoughts on this. I know what your saying and agree but I called one of my friends who is the diesel tech for one of the dealers and he told me that they had replaced FICM's in the past and then had it take out injectors that were on the edge. So I replaced the one that seemed the worst and just wanted to isolate that problem. I thought if that fixed 5, then I would do 8 later.
But what I I'm asking now is if its not the FICM or the injector what else causes these codes to come up?
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Old 10-28-2013, 11:49 AM
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You need a monitor if you are going to chase this down.

A good FICM will not damage injectors; however, it may show a weak injector when all systems are operating at or near normal.

Usually a code balance test is not the way to determine the status of an injector, it is just an indicator to start looking there. It would still require a real injector test, buzz and contribution/power balance using diagnostic software, including a compression test if deemed required.
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Old 10-28-2013, 12:06 PM
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i would look at your injector harness also. make sure its plugged in all the way on bach of ficm. i juas had to replace mine, and it made a huge diff in the way the truck runs. just my thought.
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Old 10-30-2013, 07:01 AM
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Thanks for your thoughts on this, I think this is what I'm going to do next.
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