The Crankshaft Position Sensor (CKPS) is a magnetic field sensitive type sensor that generates voltage using a sensor and a target wheel mounted on the crankshaft; there are 58 slots in the target wheel where one is longer than the others. When the slot in the wheel aligns with the sensor, the sensor voltage outputs low. When the metal (tooth) in the wheel aligns with the sensor, the sensor voltage outputs high. During one crankshaft rotation there are 58 rectangular signals and one longer signal. The PCM calculates engine RPM by using the sensor’s signal and controls the injection duration and the ignition timing. Using the signal differences caused by the longer slot, the PCM identifies which cylinder is at top dead center.
Checking reference signals from CKPS under detecting condition, if any signal is not detected for more than 0.15 sec., PCM sets P0335. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.
Item
Detecting Condition
Possible cause
DTC Strategy
? Check reference wave during cranking
? Poor connection
? Open in harness
? CKP sensor
? PCM
Enable Conditions
? IG "ON", Cranking or engine-off during driving
? No DTC related to CAM
? Camshaft position sensor state change
Threshold value
? No reference signal over 0.15 sec.
Diagnosis Time
? 0.15 sec.
MIL On Condition
? 2 driving cycles
Resistance
700 ± 70?
Fig) Signal waveform of CKPS and CMPS at idle