P1280 code - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 09-30-2009, 04:13 PM   #1 (permalink)
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P1280 code

Hey guys..this morning the 99 Powerstroke 7.3 E350 CEL comes on after a cold start..it went off after I cycled the key and then it seemed to start fine with no illuminated CEL until late this afternoon when it did it again.

RAn the NGS with Red diagnostic card and came up with this...

P1280...ICP low input

Ran KOEO On Demand....sys passed

KOEO Injestor Test.....sys passed (injectors all buzzed the same and no mute)

It doesnt sem to run rough at all, but have no clue what this is truly indicating which is an obvious fault of sorts.

Injector harness was replaced brand new about 3 years ago and cant see this as the problem....

PArt 2

Went outside on ran some KOER tests...

KOER On demand...P0476 Exh Press ctrl valve code

Cylinder contribution tests ...sys passed (this test should be the final check of the harness am I correct?)

KOER Glow Plug Monitor..sys passed

Any help would be appreciated,

Darren

Last edited by Inger; 09-30-2009 at 04:50 PM.
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Old 09-30-2009, 08:26 PM   #2 (permalink)
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DTC P1280 indicates injector control signal circuit out of range low.
Possible causes:
-- biased ICP sensor/PCM
-- open ICP sensor circuit
-- short to SIG RTN or PWR GND on ICP sensor circuit
-- open in VREF circuit

I'd look at your ICP sensor, and possibly the connector and wiring. If you have oil inside the sensor connector, then it's suspect. Could be an intermittent wiring problem like a connector socket that's spread too far apart to make good contact with the sensor pin.

That's the code you'll get if you pull the ICP sensor connector off with the key on or engine running.
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First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.

Hard or no-start? Check Here
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Old 09-30-2009, 09:10 PM   #3 (permalink)
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Originally Posted by klhansen View Post
DTC P1280 indicates injector control signal circuit out of range low.
Possible causes:
-- biased ICP sensor/PCM
-- open ICP sensor circuit
-- short to SIG RTN or PWR GND on ICP sensor circuit
-- open in VREF circuit

I'd look at your ICP sensor, and possibly the connector and wiring. If you have oil inside the sensor connector, then it's suspect. Could be an intermittent wiring problem like a connector socket that's spread too far apart to make good contact with the sensor pin.

That's the code you'll get if you pull the ICP sensor connector off with the key on or engine running.
Where is the ICP sensor located on the 99 7.3?

Is it fairly accessable or a pia?

Darren
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Old 09-30-2009, 09:57 PM   #4 (permalink)
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Right on top of the driver's side head just behind the alternator.
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First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.

Hard or no-start? Check Here
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Old 10-01-2009, 10:46 AM   #5 (permalink)
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Inger,

I'm having the same problem and have a post running also (approximately 9-29).

The sensor is easy to get at if you have a short/stuby wrench, but to make it much easier to access and remove. I did the following in <5 minutes using a standard length wrench. 1) Remove serpentine belt from alternator. 2) Remove alternator (only 3 bolts accessed from the top) and move to the side. It will now be very easy to access the sensor. I do suggest cleaning the area well before hand, so no foreign matter gets inside.

Work issues have prevented me from replacing the sensor or trouble shooting this further.

Please keep us posted as to the resolution.
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