Truck's been running fine until the other day and now I'm stumped. I backed up to load some scrap, shut the truck off, loaded it, then went to start the truck. RPMs jumped higher than normal as soon as it fired (this was audible and caught me off guard, almost sounded like i reved it) then the RPMs dropped into a very rough, lopping idle. It had no power and died about 30 secs after it started. Every time I've started it it's the same thing except the stall happens at different time but it'll always die.

Codes pulled were:
p2285
p0281 (this one doesn't always comeback when cleared)
p2287
and the KAM code

Idle readings were as follows:
ICP reads the default 875.5, reads ~2x or 0 KOEO
IPR is defaulting to 32%
ICPV is 0.0-0.3, never goes above 0.8v even when revved. Reads 0.2-0.3 KOEO.
FICM voltages (MP 48-49v, LP 13.5v, VP 14.0v)
FICM and Crank/Cam sync are both 1

I pulled the ICP plug. No change except the ICPv reads 0.0. This truck has always had an issue running with it's ICP unplugged (stalling).

I pulled and soldered the existing ICP pigtail (it had been crimped on). I jumpered Pins 2 & 3 on the sensor side of the ICP harness and got 5v KOEO. Checked for continuity on all three pins to the PCM and got almost no resistance, granted when moving the harness around I'd occasionally get 20-30 ohms on pins 1 & 2, but I'm not sure if that was just user error. Got a new ICP from Alliant and ordered a new IPR from Ford (because I don't have spares). Installed everything and buttoned the truck back up. No change in results.

I'm still getting ICP voltage entirely too low for truck operation and am looking for ideas/diagnostics on what could be causing it before I go nuts and just start slinging parts at it.

The truck had a new Adrenaline HPOP, all 8 "new" injectors, new water pump, belt, oil cooler, ficmrepair.com atlas-40 FICM, switch to ELC, all done earlier this year and has been flawless up until now.

 

What color wire do you have connected to pins 1,2,3 of the ICP sensor?

I realize it may not be easy to answer if the harness/connector replacement wires weren't documented as to which PCM wires they were connected to.

 

I just saw your signature and your profession!!!

I hate to say it now .......... but your issue sure seems to be something wrong in the ICP wiring!

 

lol, that's why we have checkers at work. I'm digging through some photos I took after the soldering to get those wire colors.

 

My "final" in my EE class kicked my behind. I had 4 tests that day and chose the EE class as the one I wouldn't study for. My grade sure reflected my decision!

 

1 to a red striped taupe looking wire
2 to a white striped taupe wire
3 to a green striped blue wire
95% sure I got that right, I can check for sure when I get home

 

Yeah, that is correct.

Just a guess, but it sounds like a short in the wiring harness somewhere. The last valve cover stud is a place where the wiring can chafe. I'm basing that guess on the P2287 code and your issues even when the ICP is dosconnected.

 

What are you using for a scan tool?

 

Yay. I was hoping that wasn't the case. I re-wrapped the whole thing last year with that tessa friction resistant tape and it's a pain to unwrap. Any guesses on which of the three it'll be?

 

Torque Pro and the SCT x4 (the truck's on it's stock tune though). All my readings were from torque Pro though

 

I would think that you would have a lot more codes if the v-reference wire had issues. So I would guess it was possible one of the other two (GY w/ RD stripe, or DB w/ LG stripe). Those are the signal return and sensor monitor wires.

That said, you might monitor the V-reference PID while you experience the issues.

 

Quick question, is it possible for the MAP sensor wiring to cause this? I can't tell if it was just dumb luck that I was poking that part of the harness when the truck died or not.
Rewrapped the entire harness the ICP is on. Didn't change much, though the truck did sound different after repairing three breaks found in the harness.
I managed to get the truck to die 3 times messing with MAP sensor wiring but can't tell if it was dumb luck or not.

 

Possible I guess. It shares the same Grey w/ red stripe wire/circuit w/ several other sensors, including the ICP. It serves essentially as a ground.

"The GY/RD wire is SIGNAL RETURN. It is a dedicated ground circuit that is used by the sensors and is physically separate from POWER GROUND. The two ground circuits should be connected internally in the PCM."

 

BTW - the following share this same circuit:
EGR valve
ICP
EBP
MAP
IAT1
WIF
Baro
APP

 

MAP sensor was a bust. The wiring looked, not pristine. Cleaned it up and rewrapped. No change. I'm running out of ideas.

Last time something like this happened, I had bought 4 garbage icps in a row (two generic, two from Ford). Had to pay a shop a grand to put a fifth one in :/