codes p2138 p2139 p2140 help!!
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Joined: Jun 2011
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From: Oshkosh
codes p2138 p2139 p2140 help!!
I have a 04 f350 with a 6.0 with all 3 of these codes I have tried everything in the book talked to diesel ford service tech can not figure it out I will post what I have done any help or ideas is appreciated
I have tested all pedal wires and tracks for breaks or shorts. I have put in 3 pedals and tested them all they test out good. I have had 3 pcms in all with no change. I do have a check engine light even though alldata tells me I shouldnt have a mil lamp with app sensor malfunction
these are my pid voltages
app1 app2 app3
closed 3.94 closed 1.41 closed .86
w open .62 w open 3.90 w open 3.40
I have tested all pedal wires and tracks for breaks or shorts. I have put in 3 pedals and tested them all they test out good. I have had 3 pcms in all with no change. I do have a check engine light even though alldata tells me I shouldnt have a mil lamp with app sensor malfunction
these are my pid voltages
app1 app2 app3
closed 3.94 closed 1.41 closed .86
w open .62 w open 3.90 w open 3.40
Hotshot
Joined: Apr 2010
Posts: 19,072
Likes: 242
From: Saratoga Springs,UT
all the numbers point to a new pcm
since you tried 3 now IDK
pcm may need to be programmed to the truck like the ficm does not shure there
did you get all this trouble shoot info from aldata just curios
since you tried 3 now IDK
pcm may need to be programmed to the truck like the ficm does not shure there
did you get all this trouble shoot info from aldata just curios
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From: Oshkosh
pcms were reflashed yes all trouble shoot info came from alldata thats only thing i have axcess to if someone else can find different trouble shoot info ill gladley try i been fighting this problem for 5 months im ready to blow this truck up im trying to buy new wiring harnesses right now
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Lead Driver
Joined: Sep 2007
Posts: 8,180
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From: Scio, OR
OK. Check the two VREF pins at the pedal for +5V. It should be constant. Wiggle the wires around and make sure it never wavers from that +5V. Also, while checking those two VREF pins, wiggle the wires around the BARO and MAP sensors, since they share the same VREF circuit.
VREF is a regulated +5V signal sent by the PCM to various sensors. If it varies, the voltage return to the PCM will vary and the PCM will get bad data.
VREF is a regulated +5V signal sent by the PCM to various sensors. If it varies, the voltage return to the PCM will vary and the PCM will get bad data.
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Lead Driver
Joined: Sep 2007
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From: Scio, OR
I'd do that, try having someone move the entire harness everywhere you can get to it. The only explanation I can think of is VREF getting shorted for some reason.
The only other suggestion would be to put it on the computer and see what the PCM sees for the APP voltages.
The only other suggestion would be to put it on the computer and see what the PCM sees for the APP voltages.
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From: Oshkosh
the only guy i know around here with ae is kinda a flake makes plans and blows me off been trying to get his help for 4 months the dealership my buddy works for are a-holes about him doing side work and i cant se sending it to a dealer ship again been there 3 times got nowhere and sure billed me i can do the same as them and throw parts at it