code P1280
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code P1280
I have a 2003 E-450 with 94XXX miles on it. It just started running rough Friday. I got code P1280 with my Snap-on scanner. The only things the scaner wants me to check is the oil level/viscosity etc. then over fill it 2 qts and tip the van foward to ensure there is no leak from the pick-up tube. Ive done this, and from these few tests they want me to check the pickup tube for leaks. I know its not easy to drop the pan so I was wondering if there were any electrical tests that should be done to check on the ICP? Any help would be great, thanks.
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it is reading about 750 at idle in park. the scanner is also having me check the readings at WOT after holding it there for 30 sec. it says if the reading is less then 1600psi. if its higher then 1600, add 2qts to the oil and raise the rear end of the vehicle 10 in. Run the same test and if the pressure is less then 1600, then suspect the oil pickup tube. If it is higher then 1600, check for correct oil level, warm engine up, run at WOT for 3min then reading should be less then 1270
Post Fiend
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From: Texas
Check the wiring to the ICP for shorts. If pressure at idle is a steady 750 with no fluctuation, it sounds like the PCM is ignoring the ICP sensor. You could verify this by removing the sensor and sticking a gauge in the hole to see true readings, or just unplug the sensor and see if the reading changes.
I'm guessing you'll see the exact same number on your scanner with the ICP unplugged. That would point to either a bad sensor or a short in the wiring.
I'm guessing you'll see the exact same number on your scanner with the ICP unplugged. That would point to either a bad sensor or a short in the wiring.
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I ran it again and noticed I was not getting an ICP voltage reading. So Im really going for broken wire/bad sensor. Is there a resistance reading I can get from the sensor? does anyone know where the ICP wiring connects? Cannon plugs/where in the ECM? Then I can disect the wiring harness and look for a short.
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This link may help you out: ECSD - Injection Control Pressure (ICP) Sensor - 1994-1997 Power Stroke FAQ
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tore into the harness, checked the resistance between the ICP plug and the PCM plug. All resistance was normal, however when I was moving my leads I got a reading between two different wires. Narrowed it down to the PCM side of the 42 pin connector. Found factory splices in both the ground wire and the 5v signal wire so for now I am stumped. Does anyone know if there is a resistance spec for the ICP? Or is the ICP cheep enough I can just throw one in and see(not a big fan of throwing parts into the unknown)
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Postmaster
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The sensor is variable capacitance so you can't check the resistance. The only test I know is to unplug it and if the idle smooths out that is probably the problem. Also, if the icp has much oil in it that can cause a problem.
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I didn't remember to wiggle the harness while testing
. I printed off the link above, and did those resistance tests. Between pin 90 on the PCM plug, and pin "A" on the plug going into the ICP I was getting .687K ohms. I looked up the price on the ICP on ebay, and its not too expensive... not sure which other way to go.
. I printed off the link above, and did those resistance tests. Between pin 90 on the PCM plug, and pin "A" on the plug going into the ICP I was getting .687K ohms. I looked up the price on the ICP on ebay, and its not too expensive... not sure which other way to go.
Post Fiend
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From: Texas
It's either wiring or the sensor.
Look at the bright side. At least you found FTE and are no longer wasting your time overfilling the oil pan and jacking up the rear end checking for a cracked pick up tube.
Look at the bright side. At least you found FTE and are no longer wasting your time overfilling the oil pan and jacking up the rear end checking for a cracked pick up tube.
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If I would have had to take off the pan, I would be pissed! I know from looking under there that there would be alot of lifting this up and droping that down etc...
Post Fiend
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From: Texas
How would you like to determine sensor or wiring issue with the engine on a stand upside down as you're re-installing the oil pan?
