Alright guys. Here's an interesting one for you.

My '03 Ford 6.0L has been acting up lately. It'll run like a raped ape for 5-10 minutes after a cold soak, then sitting at idle it will rev to ~700 rpm, and immediately drop to ~500 rpm before stabilizing back at around 650 rpm. I found that a code P2287 (ICP Sensor Circuit Intermittent) would be logged in the PCM at the same time the event occurs. After the idle transient, the truck exhibits low power to ~2,000 rpm, then takes off like normal.

Diagnostics performed:
Checked ICP sensor plug for corrosion. I found minor corrosion, so I replaced the plug, soldering and heat-shrinking the wires.
Verified full 5.0V reference voltage. 4.9-5.1V was what I had during the test.
Ran new wire from ICP sensor plug to PCM harness. Again, soldering and heat-shrinking.
Tested with known good PCM.
Connected multi meter between ICP sensor signal wire and SIGRTN wires. Voltage at KOEO was .23V, KOER Idle ~1.0V.
ICP Sensor was replaced ~7,000 miles ago when engine rebuilt.

Yesterday I was checking more stuff out, and had my diagnostic tool recording and I managed to capture these screenshots:




I notice the IPRDC% jump to 32% and the ICP and ICPD go into unison, while the ICPV voltage is all over the place. By my calculations, the truck is trying to run on about 550 psi of ICP, while the PCM believes that it has 860. Anybody have any ideas for me? I'm lost on this one...

In case the keys on the image aren't clear

ICP Volt is top (Red)
ICP is 2nd from top (Green)
ICP Desired is 3rd from top (Lt. Blue)
IPRDC% is 4th down (Purple)
Load is 5th down (yellow)
RPM is 6th down (Dk. Blue)
VSS is 7th (Purple)
VGTDC% is 8th (Orange)
ECT is 9th (Red)
EBPpsi is 10th (Green)
MAP is 11th (Lt. Blue)
FICMMPWR is bottom (Purple)

 

This is still open, I have found nothing yet...

 

Its hard to determine where you stand with a scale that auto ranges like that. For starters how much wire did you replace? From the sensor all the way to the pcm connector? I think I would consider replacing the icp sensor if the voltage isn't moving. Did you check for an opened pin at the icp sensor? Have you measured voltage with the sensor plugged in while the issue was occuring, both at the pcm and sensor?

Sent from my SCH-I605 using Tapatalk 2

 

Yeah I understand, but thats all I've got. Yes, from the icp plug all the way to pcm. All pins are fine, don't appear to be loose or bent. I did check V with it acting up, but I didn't write down the results so ill do that here in a little while. I got a new ICP sensor as well. Ill install that possibly tomorrow. It appears the icp sensor on the truck now is from a 04 or newer. Dont know it that could make a difference, but I have the right one now. (Under turbo)