I have a built 2.4 and I have these two codes in my ecu: p0340 no camshaft signal at ecu and p0335 no crankshaft reference signal at edit ecu.

The strange thing is my car runs fine, but I cannot clear the codes. I searched the forums and have not found any definitive answers as to what can cause the codes yet not affect the car.

Has anyone else had this problem?

 

When you see them occur together it is a correlation fault.... under normal circumstances this means the timing belt is not perfectly aligned.
Given that you have a 2.4, I would wager it is due to your belt choice or cam gear adjustment. It only has to be a hair off to set those faults, the gears probably aren't dialed in just right.

 

I don't think it's off, I timed this car a few times and it's spot in. I just don't see how either sensor can be malfunctioning and have a running car.

 

Due to correlation. If they are not in agreement, both codes set. It has nothing to do with their ability to function nor the vehicles running state.

 

I took the cam sensor off, it has oil in the housing on the sensor, could that be an issue?

 

It shouldn't, the sensor gets oil on it due to location, there is no seal between the reluctor and the rest of the cam.

It is highly unlikely to be an actual sensor failure. It is possible, but with it running fine its pretty unlikely to be anything other than correlation.

You are using adjustable gears right?

 

Yes I am

 

I'd check over your gear adjustment. Otherwise unless you have a dual node oscilloscope you aren't able to test the sensors apart from replacing them. And again it would be very unlikely to have a sensor fail, cause both faults to set, and still run fine.

 

To be clear, you can see a cam sensor fail and initially cause a P0340 then after enough crappy reads set a P0335 as a logic judgment.... the problem with that is you will normally get no start conditions, stalling, etc. I have never seen that happen and have no drivability side effects. Even if you had a connection problem, corrosion, whatever, you would still expect to see side effects in drivability. Only correlation will set these faults and not have any side effects in drivability (unless of course the correlation is way off).

To have the crank sensor fail in almost any capacity and still allow the car to run is nearly impossible, however.

 

I see what you mean, if either are faulty the car cannot run. Currently my car runs/starts/drives fine. I will check the timing again see if maybe I'm missing somthing. Both my gears are advanced 3.5 degrees currently.

 

Ya... it can run with the cam sensor faulty, it is rare though and usually is accompanied by hard starting, etc. The crank sensor is nearly impossible to run as it is the source for injector timing, fuel pump operation, and spark base timing. To have either sensor fail enough to cause a light and not any other symptoms is very rare of course too.

I don't do 2.4s, but given the circumstances I would have to suspect an issue with the gear adjustment. I can't help beyond that though, I'm sure some of the 2.4 guys could share their settings and maybe shed some light on it.

 

Interesting issue update. I swapped the cam sensor from a 2005 mr, my car misfired, sputtered, wouldn't run at all. I put my sensor on his car, his ran fine... So, I replace the sensor with a known good and it will not even run. But runs fine with mine...

 

That's pretty goofy. You might try manipulating the wire harness just in case something in there got disturbed, but even at that it doesn't make a whole lot of sense.
Also make sure you aren't fooling with aftermarket cam sensors. They have compatibility issues on Mitsubishi electronics.

 

Both sensor are believed to be oem, same part number stamped on them. I'm gonna try some dielectric grease and a sensor from another car.

I just can't figure out how another known good will not work, when mine does.

 

Yeah that is really crazy. I've got no good answer for that at all.