2001 Protege LX 2 liter. I have a code P0335-crankshaft position sensor.
Cannot reset the code. I have gone through the Mazda troubleshooting for P0335. Sensor measures good, new sensor tried. No shorts, opens, on wires. Measured 560 ohms between the two wires for CKP at the PCM connector. I have taken the positive and negative leads off battery and shorted them together. Cannot get the P0335 code to clear. Any suggestions?

 

"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."

I don't know that I believe that, however I DO believe it is a square wave the pcm is seeing. I "believe" the pcm converts a sine wave to square. With "modern" technology all analogs are clipped (like Dolby, only that stayed a sine wave) from a sine to square wave form. The 520 ohms i dunno, that will affect the amplitude of the wave as for the pcm to be able to read it, or be too "high" amplitude for the pcm to recognize, thus it'd more than likely give you a circuit sensor error.
ok, in laymans terms. Do you read the 520 ohms wire to wire with the sensor installed, and not installed? What do you read wire to ground (both)?Does it run? If so, can you read the voltage at the pins? Is your vom able to read hertz, either square or sine?

 

Opps, one other thing with key switch on, can you read a dc reference voltage at the pin connection?

 

520 ohms with sensor connected. reads open without the sensor.Car does not run.

 

Sorry, I mean with the sensor mounted, read resistance with open leads, both together, and both each to ground. Does the car crank? Read the reference voltage with the system intack, key switch on, do you have any voltage? Read ohms with the sensor mounted individually from the lead to ground. Also is the sensor have a slight magnetic tip, either new or old one?

 

Just throwing this in here: I once had a CKP sensor code on the Windstar. I cleaned it and made sure it has the correct distance to the tone wheel and that fixed it.
I wish it would be that easy for you too.

 

I am not familar with a car magnetic pickup aka ckp sensor on a car other than my lumina. This one isn't adjustable, but to add if the sensor isn't close enough to the reluctor/gear the amplitude/voltage will be low. Low voltage output can cause the pcm to not be able to read the signal, also too close will cause a high voltage output, thus causing a saturation to the pcm.

 

I solved the issue by replacing PCM. Found exact replacement for $65. No more code! Thanks for the advice.

 

Probably the voltage output from the pcm was burned out. If it were a reference signal fault, it would run.