P2285 - Ford Powerstroke Diesel Forum
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Old 07-22-2014, 08:28 PM
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P2285

Hello folks! I've been creeping around this site a few years and finally decided to contribute to the site and join. Btw its a great site! Anyhow.....

I have my lovely 2003 6.0. Truck has been great to me over the past 5 years. The other day I got p2285 which is ICP circuit out of range low. I have replaced ICP and pigtail harness. Also swapped out IPR with known good one. It has all the symptoms of a bad ICP. (rough idle, rpm jumping around) I noticed that desired ICP stays constant and the actual ICP jumps around desired ICP. Sometimes its quite a bit, like 300 psi different. I noticed some weird things though also. Like FICM_VPWR jumps around a lot. 11.99 volts to 13.2. I put a multimeter on battery and it would stay around 13.2.

I will stay on track with the fault code though. Service manual states to check ICP VREF circuit pin 2 and signal return pin 1 (which I will do and report back)

Anybody been down this road before and made it to PCM replacement?
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Old 09-09-2014, 10:48 AM
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Sorry it took so long to get back.

Checked for ref voltage to ICP. 5 volts was present. Checked ground- ok. Jumped ref voltage to signal wire. Read 5 volts on scantool. Shook wiring and inspected. All ok. When it isnt acting up it does seem a little low on power and has some lag time on RPM ( more than normal). I cant see a HPOP causing a problem like this since its not acting up all the time. It doesnt matter if its hot or cold. If it dies it will start right back up.

How interchangeable is PCM on the 6.0s? I might try to swap one to see.

Anyone else have any other good ideas?
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Old 09-09-2014, 04:12 PM
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ive changed a lot of them, there are even some trucks without the original PCM. Your ABS will stop working and the TCM is going to re learn, but it goes back to normal when you put the original PCM into it.
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Old 09-09-2014, 04:13 PM
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Did you checked for the sign wire voltage while the turck is KOER?, is it the same voltage reading you get on the voltimeter and scantool?
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Old 09-10-2014, 08:24 PM
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Jorge, thanks for the reply. No I have not checked signal voltage with KOER. All tests I have done have been KOEO. I unplugged the ICP and the truck runs fine besides the fault code. I better inspect my wiring again? I know when its not plugged in it will use "calculated" pressure from the PCM.
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Old 09-10-2014, 11:59 PM
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What is your FICM voltage? Another thing is that 13.2 volts seems to be low if the truck is running and no power hungry accessorys are on. These trucks are very sensitive to less than stellar electrical signals
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Old 09-11-2014, 06:52 AM
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What you want to know is the voltage that your ICP sensor is sending to the truck. at idle, it should be about .8V
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