No FICM Sync
Hotshot
Joined: Apr 2010
Posts: 19,060
Likes: 238
From: Saratoga Springs,UT
Change the ICP sensor see what happens
I get the feeling your gauge isn't reading things correct But IDK
OR you really don't Have Sync
But if the CMP CKP sensors are checking Out OK then and sounds like they are so
I wouldn't even worry about anything other then the Compleate Obvious and that's Changing the ICP Sensor at this point
The ICP sensor is Clearly Bad
It Should default unplugged and let the truck start
You reported a Cranking RPM of 257rpm I don't think our starters can Achieve that fast so there Could be something wrong with sync/pcm IDK 100% yet it does seam alittle out of Whack
I just have a Hard time to believe you have Multiple Problems that are Unrelaited systems that all happened at same time
IMO you change ICP sensor and see what happens its Clearly BAD then if it still don't start Move On
I forgot to tell you to there 1 more harness for Sync to check and that's From PCM to FICM Itself!! What I posted was only from PCM to CMP/CKP Sensors
It almost makes sense the PCM Failed But I would like to see a New ICP sensor installed and Clean or replace ICP pigtail see what happens with new ICP sensor since it will need to be change regaurdless
I get the feeling your gauge isn't reading things correct But IDK
OR you really don't Have Sync
But if the CMP CKP sensors are checking Out OK then and sounds like they are so
I wouldn't even worry about anything other then the Compleate Obvious and that's Changing the ICP Sensor at this point
The ICP sensor is Clearly Bad
It Should default unplugged and let the truck start
You reported a Cranking RPM of 257rpm I don't think our starters can Achieve that fast so there Could be something wrong with sync/pcm IDK 100% yet it does seam alittle out of Whack
I just have a Hard time to believe you have Multiple Problems that are Unrelaited systems that all happened at same time
IMO you change ICP sensor and see what happens its Clearly BAD then if it still don't start Move On
I forgot to tell you to there 1 more harness for Sync to check and that's From PCM to FICM Itself!! What I posted was only from PCM to CMP/CKP Sensors
It almost makes sense the PCM Failed But I would like to see a New ICP sensor installed and Clean or replace ICP pigtail see what happens with new ICP sensor since it will need to be change regaurdless
Hotshot
Joined: Apr 2010
Posts: 19,060
Likes: 238
From: Saratoga Springs,UT
When you look at Sync are you cranking long enough for the Gauge to Update???
I honestly wouldn't do anything until the ICP issue is Fixed
Therers been a few problems with Gauges out there being able to Read Sync I am not framiliar with your gauge so IDK
I honestly wouldn't do anything until the ICP issue is Fixed
Therers been a few problems with Gauges out there being able to Read Sync I am not framiliar with your gauge so IDK
Thread Starter
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New User
Joined: Jan 2008
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Hi Josh, Thanks for your continued interest, it's always good to get a little food for thought. First let me correct the RPM that should have read 157 (but I have seen it reach 190).
The reason I'm working it this way is that I still don't have the ICP sensor and pigtail in hand. I did disconnect the ICP but it still didn't start and it still showed no sync to either CMP/CKP or FICM. I did think it was strange to have two completely different faults at once, but I know it's possible (when I was working aircraft I'd see it all the time). When I first started troubleshooting I had the bad ICP and the no FICM sync but then ended up losing the CMP/CKP sync as well, when I did get sync originally
It would come on in a few seconds. I know I need both parameters to start so I worked the sync issue while awaiting parts. I'm 99.9% I don't have an issue with my diagnostic software, I also did the pin to pin on the FICM TO PCM harness with no defect noted.
I'll keep you posted on my progress as soon as I start getting parts in, if you can think of anything else I'd appreciate you input.
Gary
Hotshot
Joined: Apr 2010
Posts: 19,060
Likes: 238
From: Saratoga Springs,UT
Check Fuse under steering wheel
#F2-22
#F2-36
And also relay #302 is the PCM power control
These^^Fuses or relay could cause NOSYNC
Your RPM is wiythin spec of 150-200rpm range so that good
#F2-22
#F2-36
And also relay #302 is the PCM power control
These^^Fuses or relay could cause NOSYNC
Your RPM is wiythin spec of 150-200rpm range so that good
Fleet Owner
Joined: Nov 2003
Posts: 27,897
Likes: 3,615
I have read that if you lose CKP signal, your HPO readings could default to 14% IPR and 300 psi ICP (would love for a Tech to confirm that - I think it is in the PC/ED manual!). This is one reason Ford recommends troubleshooting CKP/CMP SYNC issues first (assuming that the scan tool is reporting that correctly and it really is dropping out).
That being said, If you know you have bad sensors, nothing wrong w/ changing them out as soon as possible.
Edit -
Was reviewing no-start info and came across a reference to an old reference to a "shorting out EBP sensor" causing PCM issues. Might be worth a try (try starting w/ EBP unplugged) while you wait for the ICP sensor.
That being said, If you know you have bad sensors, nothing wrong w/ changing them out as soon as possible.
Edit -
Was reviewing no-start info and came across a reference to an old reference to a "shorting out EBP sensor" causing PCM issues. Might be worth a try (try starting w/ EBP unplugged) while you wait for the ICP sensor.
Last edited by bismic; Apr 15, 2026 at 04:44 AM.
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Cam sensor crank sensor synch
Josh
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Joined: Mar 2009
Posts: 74
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Thanks,
I understand Cam sensor and crank sensor sync, which injectors to fire and when.
Concerning FICM Sync, does the signal simply pass from the Crank and Cam sensors to and through the PCM to FICM or does the PCM do something with the signal prior to sending to the FICM? What constitutes a FICM Sync?
Looking at the schematic:
Cam Position Sensor is wired directly to the PCM on PCM Connector C1381bpins 31 and 43
Crank Position Sensor is wired directly to the PCM on PCM Connector C1381bpins 30 and 41.
Then from PCM to FICM:
Cam Position signal PCM Connector C1381c pins 20 to FICM Connector C1388CPin 10
Crank Position signal PCM Connector C1381c pins 19 to FICM Connector C1388CPin 5
I understand Cam sensor and crank sensor sync, which injectors to fire and when.
Concerning FICM Sync, does the signal simply pass from the Crank and Cam sensors to and through the PCM to FICM or does the PCM do something with the signal prior to sending to the FICM? What constitutes a FICM Sync?
Looking at the schematic:
Cam Position Sensor is wired directly to the PCM on PCM Connector C1381bpins 31 and 43
Crank Position Sensor is wired directly to the PCM on PCM Connector C1381bpins 30 and 41.
Then from PCM to FICM:
Cam Position signal PCM Connector C1381c pins 20 to FICM Connector C1388CPin 10
Crank Position signal PCM Connector C1381c pins 19 to FICM Connector C1388CPin 5
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Originally Posted by Bullitt390
In a nutshell the PCM is getting feedback that the engine is turning over, once 150 rpm is achieved and 500 psi the FICM is brought on board, hence PCM/FICM synch.
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