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Battery Voltage vs FICM Voltage
Hey guys. I've been doing a lot of reading on FICM issues, and I'm pretty sure I have one, but I'm trying to determine where the exact issue lies.
Symptoms: Starts fine, but runs rough (stutters) until engine gets up to temp. After that, runs great.
I am able to read voltage through the OBDII port (FVP - FICM Vehicle Power, FMP - FICM Main Power) and checked voltages with key on (FVP: 11.5V, FMP : 48ishV), and after cranking (FVP: 11.5V - before alternator kicks in, FMP: 44-48V).
I went with the easiest issue first, battery voltage was low, so I checked it with a voltmeter and it read 12.4V with engine off. I checked connections at the battery, and those are fine. So this is where my question comes in, is this a bad connection or a discrepancy in reading from the OBDII port? Also, is this a good indication there is a loose connection in the FICM (obviously it needs redone, but I'm trying to make sure there aren't other issues so that when I get it redone, I don't hurt the redone FICM). Does FVP read from the FICM and if so, sounds like it's definitely a bad connection in the FICM? Should I be looking for other bad connections?
Thanks for your help!
Last edited by griffgj; 01-14-2013 at 08:23 AM.