Code P0344 CPS and P1280 ICP now what?

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#16

03-07-2007, 08:38 AM

Cuda_jim

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Yes, reset the PCM, pull #9 fuse. But get the codes pulled ASAP. The PCM may have stored your most recent CEL.

ICP wires may cause your intermitant CEL. Repair it if it looks bad to you.
The following is ICP function(s):

The ICP sensor's primary function is to provide a feedback signal to indicate rail pressure so that the PCM can command the correct injector timing and pulse width and the correct injection control pressure for proper fuel delivery at all speed and load conditions.

If the PCM detects a malfunctioning ICP sensor the CHECK ENGINE light is illuminated and the PCM will go to open loop control of injection control pressure. (Operate from an estimated injection control pressure.)

What was your FP after the FPR shim? Mines @ ~80 psi. It's difficult to read cuz the FP gage bounces so much but you'll get the idea. Sometime shimming the FPR will cause a weak (old) fuel pump to act up.

Return the truck to stock then see if it does it.

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#17

03-07-2007, 09:05 AM

jnye6625

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I am pretty sure i have the right CPS. The guy at the international dealer said that either of them would work fine, but i took the one for pre 1997 just in case. My truck is a 1995. I'm thinking that it wasnt the CPS at all now that i have the same exact symptoms with a new one. Right now the batteries on the truck are unhooked to try and reset the computer just in case it is still running differently because of a stored code. Can anyone show me a diagram of the under hood fuse panel? I dont have the owners manual and there is no diagram on the cover.

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#18

03-07-2007, 09:08 AM

jnye6625

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Cuda, I am not sure what my new fuel pressure is. I will re connect the batteries and see how the truck acts around lunch today. If it still gives me a problem i will pull the chip and see what it does. If that doenst help i'll remove the BB from the FPR and see what happens. I'll start putting things back starting with the chip and see where the issue is. I'll probably end up fixing up my ICP sensor connector also. Thanks

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#19

03-07-2007, 02:15 PM

Phydeaux88

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I doubt the FPR shim is the problem mine has been in place for 4 years with no problem.

Pull the chip might be a good idea it could even be a bad ship connection
I would then look at the the ICP

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#20

03-07-2007, 02:48 PM

Cuda_jim

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It would be best if you had it scanned before re-setting the PCM. It may lead you to the cause of ths trouble instead of just guessing at it, that's what we are doing now, just guessing.

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#21

03-07-2007, 02:51 PM

jnye6625

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Cuta, I definately agree with you but its hard to get my busy friend over here to read the codes. haha. I'm going to check the obvious stuff tonight and pull the chip if it doenst fix it. THanks for all your help guys.

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