Les Posted January 31, 2009 Share Posted January 31, 2009 When no start FICM sync is no & all voltages 0v. Try new pcm & FICM-same.No chafed wires. All circuits test ok. Int. no communition with FICM. Any ideas? Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted January 31, 2009 Share Posted January 31, 2009 All of the FICM voltages are zero? What codes? New FICM relay? Backprobe the FICM pins and verify power/ground and voltage drops. I'd install a breakout box and compare all pin voltages to the WSM. If that got nowhere, I'd start scoping all of the PCM pins. Good Luck! Quote Link to comment Share on other sites More sharing options...
Les Posted February 2, 2009 Author Share Posted February 2, 2009 code u0105, no communication with FICM. P.P.tests lead to FICM replacement which did not fix concern. FICM & PCM relays are new. Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted February 2, 2009 Share Posted February 2, 2009 Think logically- you either have a wiring problem with an open/shorted circuit, or a bad component. Install a BOB and check all voltages KOEO at the PCM pins and compare them with the WSM voltage levels. I do not know of a BOB for the FICM, but I suggest strongly you check power and ground at the FICM itself to rule out power supply problems. Compare voltages with the battery negative post, voltage drops should be under .1v with under .050v preferred. With a BOB installed, I'd verify the communication circuits are intact between the FICM and PCM with a voltmeter and ohmmeter. Check the FICM plugs very closely for pins pushed into the connector, bent pins, and make sure both lock tabs are perfect n each connector. Put some spray silicone on them to make sure they push in completely, as they're in a difficult spot to connect. I keep a known good FICM on hand for weird ones and suggest you guys do too, as your new one could be bad. With all of your FICM PWR voltages zero, the circuits I'd focus on are the power and ground to the FICM, communication circuits between the FICM and PCM, and the possibility of a bad new FICM. You did program the new FICM with the IDS, right? Good Luck! Quote Link to comment Share on other sites More sharing options...
Fredsvt Posted February 3, 2009 Share Posted February 3, 2009 I've seen 2 '04 6.0s with a no start and no power to the FICM. Both had rubbed through (green death) wires on the left inner fender down near the shock tower area. From memory (bare with me) the wire that feeds the trigger circuit for the FICM relay was rubbed through. Jumping the FICM relay made both start. Quote Link to comment Share on other sites More sharing options...
BrunoWilimek Posted February 3, 2009 Share Posted February 3, 2009 I have also seen wires damaged near the left battery box, the harness that goes between the FICM and the PCM. This one had been in a collision, but had heads replaced previously, involving engine re+re(according to warranty claim, anyhow). I don't know when it happened, but harnesses were not properly located and rubbed through. Truck was towed in no-start and PPTest led to FICM replacement, which did not fix it. Quote Link to comment Share on other sites More sharing options...
Les Posted February 4, 2009 Author Share Posted February 4, 2009 I am positive it is the FICM harness between FICM & PCM. Have one ordered. Will let know if fixed. Quote Link to comment Share on other sites More sharing options...
Les Posted February 12, 2009 Author Share Posted February 12, 2009 I have replaced the wiring harness between the PCM & FICM. So far all is good. Thanks for info. Quote Link to comment Share on other sites More sharing options...
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