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Power Strokes
6.0 Tech
No start, out of the blue...
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[QUOTE="Mdub707, post: 373781, member: 107"] Looking at my picture here again (sorry for the poor paste job into paint that made it really small...) FICM logic power needs to be at LEAST 7 Volts. It had a "max" value of less than 3... In the document I linked in the last post, I found this bit of info [B]• If there is no FICM logic power to the FICM, the injectors will still buzz once the key is cycled but the engine will not start. There will be no other symptoms related to the no start condition. • With the WDS, select DATALOGGER PID FICM LPWR. This PID will show how much voltage is being supplied to the FICM. If less then eight volts, check for short/open or low battery. • If no voltage is being supplied, check logic fuse located in the relay center box. This box is mounted on the driver’s side toward the cowl. • No voltage could also be caused by the FICM logic circuit through the C1282 (12-PIN) connector.[/B] So it looks like I should be checking over the wire harness'? It seems like if I had chaffing wires I would have had more issues than I do right now. I think I might dig in, take the FICM out, remove the FICM wire harness that feeds the injectors and go over it with a fine tooth comb. I do fix FICM's often and always test them on my truck, so those 3 big plugs that connect to the FICM are getting moved a lot. You would think if that was genuinely an issue, it would have been more intermittent than this. However, low logic power would have explained why I was getting low voltage to the injectors while they were buzzing before, and then 0.0V after they stopped buzzing... but I don't have that issue now, it's 48V cranking and 48 key on engine off. I'm kind of just thinking out loud here hoping to spark new ideas. :morons: The SYNC and FICM SYNC operations are also of interest right now. [B]• SYNC is totally dirived from the CKP sensor. It is possible to have no CMP sensor signal and still have SYNC (YES) and an RPM signal. • NO SYNC and no RPM signal, typically is a faulty CKP sensor/circuit problem.[/B] [B]The FICM uses CMPO (Camshaft Position Sensor Output) and CKPO (Crankshaft Position Sensor Output) signals, which are sent by the PCM, to calculate FICM SYNC. FICM SYNC is calculated by the FICM and is the correlation between the camshaft pin and the crankshaft triggers. Once FICM SYNC is achieved, the FICM uses engine speed, MFDES (Mass Fuel Desired), EOT, and ICP to calculate fuel timing, pulse width, and pilot injection usage. If the CMPO and CKPO signals are not properly timed, FICM Sync may not occur.[/B] [/QUOTE]
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