Join Date: Aug 2008
Location: columbus ohio
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I would say the ficm is gone. Sometime when a resistor/diode/capacitor is on it's way out the component will work under higher voltages till it shuts down and (unwelds) releaves it's self. Then the component is gone forever. If you had high enough volts from generating the alt good while powering glowplugs/starter/aih then the ficm would cause a good solder (weld) connection from heat and connet on the ficm board till it cooled and the connection recessed from heat worse than the first restart with eather.
The codes usually point to the direction of the ficm, and I've seen plenty of them go bad. Had a service rig that had a intermittent bad miss traced to a water spot in the ficm that corroded the circuit board. I had dang near 10 codes that had nothing to do with the ficm. But low and behold!!!
It's an expensive part, enclose it in some plasic/spray and add a 12v computer fan to the bottom to suck any moisture and be happy for years to come. Should have been a recall, done it to 10+ trucks so far and not a single complaint. Most being used 40-50k miles a year and year round.....
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Last edited by chuckwagon009; 09-17-2009 at 09:33 PM.