So Many Codes So Little Time
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New User
Joined: Aug 2015
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From: Everett
So Many Codes So Little Time
So I'm on the highway - light truck, floor it to pass and wham fives codes get triggered. Just to check, I cleared them all and went for another drive, they all came back when I pulled some power out of it on a hill.
P0261
P0202
P0264
C2102
C2402
Do these all add up to a bad FICM?
Batt 14.2 V
FLP 13.5 V but dips sometimes
FMP 38.5 V but of course moves around dependent on load.
Is this much voltage drop from Battery to FICM normal?
P0261
P0202
P0264
C2102
C2402
Do these all add up to a bad FICM?
Batt 14.2 V
FLP 13.5 V but dips sometimes
FMP 38.5 V but of course moves around dependent on load.
Is this much voltage drop from Battery to FICM normal?
Hotshot
Joined: Dec 2003
Posts: 15,369
Likes: 121
From: Stuttgart, Ar
So I'm on the highway - light truck, floor it to pass and wham fives codes get triggered. Just to check, I cleared them all and went for another drive, they all came back when I pulled some power out of it on a hill.
P0261
P0202
P0264
C2102
C2402
Do these all add up to a bad FICM?
Batt 14.2 V
FLP 13.5 V but dips sometimes
FMP 38.5 V but of course moves around dependent on load.
Is this much voltage drop from Battery to FICM normal?
P0261
P0202
P0264
C2102
C2402
Do these all add up to a bad FICM?
Batt 14.2 V
FLP 13.5 V but dips sometimes
FMP 38.5 V but of course moves around dependent on load.
Is this much voltage drop from Battery to FICM normal?
Postmaster
Joined: Aug 2015
Posts: 3,910
Likes: 18
From: NW IA
To add to the above advice, these injectors need to be fed enough voltage, or soon enough they will start giving you codes.
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New User
Joined: Aug 2015
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From: Everett
I decided to look inside the FICM to see what was there and to look for bad solder joints. The solder joints look perfect even with 10x magnifier but i found corrosion under the four screws that connect one board to the other. I cleaned that corrosion off of the board and posts put in all back together and in the truck and voltages are perfect! It may not be a permanent fix but it got me on the road for tomorrow.
Now that I have been closely watching all of the voltages I don't think that the alternator is 100% so on to the next thing...
Thanks for all of the info on this site!
Now that I have been closely watching all of the voltages I don't think that the alternator is 100% so on to the next thing...
Thanks for all of the info on this site!
Former Vendor
Joined: Feb 2010
Posts: 1,803
Likes: 6
I decided to look inside the FICM to see what was there and to look for bad solder joints. The solder joints look perfect even with 10x magnifier but i found corrosion under the four screws that connect one board to the other. I cleaned that corrosion off of the board and posts put in all back together and in the truck and voltages are perfect! It may not be a permanent fix but it got me on the road for tomorrow.
Now that I have been closely watching all of the voltages I don't think that the alternator is 100% so on to the next thing...
Thanks for all of the info on this site!
Now that I have been closely watching all of the voltages I don't think that the alternator is 100% so on to the next thing...
Thanks for all of the info on this site!
As for the FICM, if it starts acting up again, I know a guy.
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New User
Joined: Aug 2015
Posts: 13
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From: Everett
This is killing me! After cleaning the posts it ran great. For a while. I did change the alternator and now with all acc on batt voltage stays above 13.6. 14.2 with lighter loads. Much better than before. After driving it a while for a good test, the FICM main voltage started dropping. Now it is worse than ever as low as 25 volts and runs rough. Wont idle. So it probably is dying. cant get a FICM relay today. I inspected the wiring harness for chafing near the FICM no signs of any. Can the FICM have intermittant problems? I hate replaceing parts without knowing exactly whats wrong and I do not want to damage a new FICM.
If the relay was bad it would just be zero volts to FICM right?
Is there anything else to check before replacing the FICM?
Thanks!
If the relay was bad it would just be zero volts to FICM right?
Is there anything else to check before replacing the FICM?
Thanks!
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79F150EFI
1987 - 1996 F150 & Larger F-Series Trucks
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Oct 13, 2010 09:04 AM
