6.0 no start. Using scangauge please help
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6.0 no start. Using scangauge please help
Need help. Scangauge reads icp ok. Ipr ok.. Fmp voltage is all over the place from 42 down to 2. Flp is also all over the place from 11 down to 2 volts. And no Syc. Load checked batteries good. Voltage is 11.5 down to 10.5 when cranking. Fuel good. No pre warning signs. Parked running good. I have read tones of forums but none with 3 issues. Could it be the relay?? Would a bad ficm show no syc on cranking?? Why is my flp voltage so up and down.
Lead Driver
Joined: May 2014
Posts: 6,545
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From: Virginia Beach VA
Change the relay.
Then check FLP, it shouldn't be lower than 9.0v... ever. Check your alternator, it should be doing 13.6v or more.
If FICM drops to less than 45v, it's toast.
Fix cam or crank sync, that should get you back FICM sync. You need both to be 1 when cranking for FICM to be 1, its an x-gauge for scan gauge.
That low cranking voltage may be causing low RPM, why they popped codes. You need 150+ RPM to fire it.
Often, if it fails to fire you'll get a code for crank sensor.
Then check FLP, it shouldn't be lower than 9.0v... ever. Check your alternator, it should be doing 13.6v or more.
If FICM drops to less than 45v, it's toast.
Fix cam or crank sync, that should get you back FICM sync. You need both to be 1 when cranking for FICM to be 1, its an x-gauge for scan gauge.
That low cranking voltage may be causing low RPM, why they popped codes. You need 150+ RPM to fire it.
Often, if it fails to fire you'll get a code for crank sensor.
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Readings
Pretty new at this. Cleaned batt connections. Tried wiggling wire harness in all spots known for chaffing. 2003 f350.
Icp 0 - koeo 1600 cranking
icv .13 koeo 2 cranking
fmp koeo starts at 41 drops to 0
flp koeo starts at 9 drops to zero
voltage bouncing all over on fmp and flp even when not cranking
ipr 14.8 koeo - 48 cranking
rpm 125
voltage 11.7. Cranking down to 10.5-11
do I have multiple problems or can one component cause all issues. Like I said was running fine when parked.
Icp 0 - koeo 1600 cranking
icv .13 koeo 2 cranking
fmp koeo starts at 41 drops to 0
flp koeo starts at 9 drops to zero
voltage bouncing all over on fmp and flp even when not cranking
ipr 14.8 koeo - 48 cranking
rpm 125
voltage 11.7. Cranking down to 10.5-11
do I have multiple problems or can one component cause all issues. Like I said was running fine when parked.
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Senior User
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From: Chico, ca
Dont know where you are on this, but I have had problems like this that were the result of poor connections in the main wiring harness. the round connectors on the left inner fender well to be precise. Hope you get it figured out soon.
Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 14
From: Virginia Beach VA
Check cam and crank sync, you need both of those to get FICM sync. Also the drop to zero on the FICM isn't a good thing. Your logic power input drops to zero... shows an alternator issue as that supplies all the truck power once the motor is running. Starting power comes from the batteries, once it's running, the alternator takes over.