FICM sync? - Ford Powerstroke Diesel Forum

 
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post #1 of 9 Old 04-09-2013, 07:01 AM Thread Starter
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FICM sync?

Hey guys, I replaced an IPR valve yesterday in this 2006 F250 Because there was zero ICP pressure ran fine afterwards this morning it will not start again ICP, FICM looks good but FICM sync is "no" during cranking isn't it supposed to be "yes"? Is FICM sync the cam sensor talking to the FICM ? If so could the cam sensor the bad?


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post #2 of 9 Old 04-09-2013, 07:34 AM
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I would check wiring to cam sensor. Wiggle wiring harness on driver side and see if she will fire. My problem was where the shielded cable terminated at the plug connector. I got mine running by wiggling wires and while it was running wiggle Barnes again and truck threw a code for CPS low. Sure enough where the splice was the bare wires touched together shorting out. I pulled new shielded cable due to abrasions where harness comes over the valve cover. Got some 12ga shielded comm. wire from electronics store. The splice was never sealed with heat shrink. Good luck with it


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post #3 of 9 Old 04-09-2013, 07:43 AM Thread Starter
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Thanks man, so FICM sync is supposed to be "yes" during cranking?


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post #4 of 9 Old 04-10-2013, 11:28 AM Thread Starter
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So the FICM sync is supposed to be "no" during cranking I guess because I put a new cam sensor in and it still said "no" during cranking but it fired right up.


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post #5 of 9 Old 04-10-2013, 11:32 AM
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Sorry for the late post but I can't remember if it is yes during cranking or not. I don't think me did until it fired. Glad you got it fixed.


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post #6 of 9 Old 04-10-2013, 02:30 PM
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sync

When the engine first rolls over sync is NO. Once it has rolled over enough for the sensors to send enough information to the FICM and it determines the cam and crank relationship is ok then it goes to sync and the engine will be able to start.

Just for reference there are 2 syncs, one for communication between the sensors and FICM and between FICM and PCM.


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post #7 of 9 Old 04-10-2013, 02:58 PM Thread Starter
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Quote:
Originally Posted by dannyboy950 View Post
When the engine first rolls over sync is NO. Once it has rolled over enough for the sensors to send enough information to the FICM and it determines the cam and crank relationship is ok then it goes to sync and the engine will be able to start.

Just for reference there are 2 syncs, one for communication between the sensors and FICM and between FICM and PCM.
Oh, okay. So if there was another problem like for example a high-pressure oil leak that was preventing it from starting up sync would turn to "yes" After cranking for a few more seconds?


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post #8 of 9 Old 04-10-2013, 03:28 PM
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sync/ficm sync is going to be yes before any injectors are commanded to fire. No RPM means the IPR is never commanded shut.

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post #9 of 9 Old 04-10-2013, 04:04 PM Thread Starter
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Got it. Very helpful knowledge. Thanks man.


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