It’s plugged back in now we pulled it back off and I messed with it so we’re back to the original over fueling and backfiring problemIf the connector is fully plugged into the FICM, it is hard for me to believe that all of the wires in that harness are having issues. I guess it could happen.
We have put a good ficm on it it can off a running truckWell said Crawler.
OP - every mechanic I know has a spare (known to be good) FICM to use for testing. It is about the only way to identify a FICM w/ a bad logic board (ie install one known to be good and see if it resolves the issues).
That said, most individuals aren't going to have one. In that case, the best thing to do is to send your FICM in to a reputable/honest shop for it to be tested.
For that I recommend FICMrepair.com.
Shortcuts when troubleshooting can cost you a LOT of money.
The low voltage only happens after cranking for a bit.but where would I check that at? That very well could also be my battery’s I can’t remember if it does it when I hook the jumper cables up to it or not but here latley I just throw 2 sets of cables on it cause it’s takin so much to get it startedIf it’s in the harness then the FICM won’t change anything.
The low voltage pre FICM is not good. We’ve brought this up and it needs to be addressed.
Right now you just have to chase one issue down at a time.
Just to weigh in a bit here, been reading and learning too. To me it sounds like an issue with the ficm harness connector, I’ve had similar issues with the dt466e engines. I would ohm out the harness, but if you got another one coming already...
Well said Crawler.
OP - every mechanic I know has a spare (known to be good) FICM to use for testing. It is about the only way to identify a FICM w/ a bad logic board (ie install one known to be good and see if it resolves the issues).
That said, most individuals aren't going to have one. In that case, the best thing to do is to send your FICM in to a reputable/honest shop for it to be tested.
For that I recommend FICMrepair.com.
Shortcuts when troubleshooting can cost you a LOT of money.
The low voltage only happens after cranking for a bit.but where would I check that at? That very well could also be my battery’s I can’t remember if it does it when I hook the jumper cables up to it or not but here latley I just throw 2 sets of cables on it cause it’s takin so much to get it started
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The alternator showed to be chargin at 13.5 or so atleast on the scan tool. I can’t remember if the other ficm dropped Voltage when I was starting it or not.i do remember though that the voltage while running was actually better then mine but only like a volt higher I think it sat around 49 where mine sits at 47-48Load test the battery’s. Then check the alternator. After that it becomes a lot of chasing and looking usually.
Battery’s are the most likely reason. But a weak alternator isn’t uncommon.
The alternator showed to be chargin at 13.5 or so atleast on the scan tool. I can’t remember if the other ficm dropped Voltage when I was starting it or not.i do remember though that the voltage while running was actually better then mine but only like a volt higher I think it sat around 49 where mine sits at 47-48
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I’ll try an load test them batteries tomorrow I figure there the culprit cause it didn’t start dropin that much till it had been cranked on a bunch when I had the hot start issueI’m not concerned about the voltage output of the FICM. I’m concerned about the low input to the FICM and ECM.
I’ll try an load test them batteries tomorrow I figure there the culprit cause it didn’t start dropin that much till it had been cranked on a bunch when I had the hot start issue
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Oh ya I always replace both batteries lol I’m used to the whole routine of replacing both at once with all the equipment I’ve gotMake sure you disconnect the batteries. That way you can isolate them and load test them individually rather than as a system. If one is bad and one is good, then it may not fail a load test if they are wired together.
Also if you replace one, it’s advised to replace the other.
Yes load tested the batteries tonight and one showed bad and the other showed weak. But the one that was goin down to the bad side on the charger just to see if it’ll hold alittle juice.i think there gonna try and get the harness on tomorrow evening.i plan on changing both batteries anyways I just wanna see if I can bring um back to life first.Odd I replied to this thread yesterday. But it isn’t showing on my end.
Have you had a chance to load test the batteries?
Did you install your new harness?