A Crankshaft Position Sensor (CKPS) is a magnetic 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.
If there is no signal from CKPS while there is CMPS signal, PCM sets DTC P0339.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Signal check
? Poor connection
? Open or short in signal circuit
? CKPS
? PCM
Enable Conditions
? Edge counter of camshaft position sensor > 8
Threshold Value
? No signal
Diagnostic Time
? Continuous
MIL ON Condition
? 2 driving cycle