So Ive been driving around my evo now for sometime with the p0335 p0340 codes popping up. It idles and starts fine(knock on wood.) It can boost to 14 psi no problem. But when I turn it up to 20 psi(controlled by my avcr) at WOT, it goes crazy. I've read everywhere, and no one seem to fixed this. I've seen a few threads saying that it fixed it self. Oh and btw my timing is good.

 

anyone?

 

Hey sadc... I know there are plenty of replies/threads about this, and many people say exactly what you mention. But just so you know, the car is a computer, so it will only trip the codes if there's actually a problem.

So... in short, you have a problem with those circuits. It is HIGHLY likely that this is as simple as a poor connection, but of course, it could be much more serious than that... though, you'd likely notice.

My advice would be to pull those connectors, and be sure they're clean, and are making good contact, and if so... put a SMALL amount of electrical connection grease in there and see if that helps.

 

I dont know where you were looking but it took me 5 sec.

1) Technical Description

Camshaft Position Sensor Circuit Malfunction
What does that mean?

This indicates that a problem was detected in the camshaft position sensor circuit. Since it says circuit, that means the problem could lie in any part of the circuit - the sensor itself, the wiring, or the PCM. Don't just replace the CPS (camshaft position sensor) and think that will definitely fix it.
Symptoms

Symptoms can include:

Hard starting or no start
Rough running / misfiring
Loss of engine power

Causes

A code P0340 could mean one or more of the following has happened:

a wire or connector in the circuit could be grounded/shorted/broken
the camshaft position sensor may have failed
the PCM may have failed
there exists an open circuit
the crankshaft position sensor may have failed


2) Crankshaft Position Sensor A Circuit Malfunction
What does that mean?

The crankshaft position sensor (CKP) measures crankshaft location and relays this information to the PCM (Powertrain Control Module). Depending on the vehicle, the PCM uses this crankshaft position information to time the spark properly or on some systems it is only for misfire detection and does not control spark timing. The CKP sensor is stationary and works in harmony with a reluctor ring (or toothed ring) that is attached to the crankshaft. As this reluctor ring passes in front of the CKP sensor, the magnetic field created by the CKP sensor is interrupted and this creates a square wave voltage signal that the PCM interprets as crankshaft position. If the PCM detects that there are no crankshaft pulses or if it sees a problem with the pulses on the output circuit, P0335 will set.

Symptoms

NOTE: If the crank sensor is used only for misfire detection and NOT spark timing (this varies with the vehicle), the vehicle should start and run with MIL (Malfunction indicator lamp) illumination. Also, some vehicles require several key cycles to illuminate the MIL. If this is the case, there may be no MIL illumination until the problem often enough over time. If the crank sensor is used for BOTH misfire detection and spark timing, the vehicle may or may not start. Symptoms may include:

Vehicle may not start (see above)
Vehicle may run rough or misfire
MIL illumination

Causes

A P0335 "check engine light" code could be caused by:

Damaged CKP sensor connector
Damaged reluctor ring (missing teeth or not turning due to sheared-off keyway)
Sensor output open
Sensor output shorted to ground
Sensor output shorted to voltage
Failed crank sensor
Broken timing belt
Failed PCM

 

Studio, what he was saying (I believe) was that there are many posts/threads about these codes on the msg board, and few resolutions. They do seem to be a recurring theme for some Evos.