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 frequency counter of the gap correction is retarded over 265, PCM sets DTC P0337.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Reference mark check
? Poor connection
? Open or short in signal circuit
? CKPS
? PCM
Enable Conditions
? Idle engine speed > target speed - 50rpm
Threshold Value
? Frequency counter of the gap correction (Minus side) > 265
Diagnostic Time
? Continuous
MIL ON Condition
? 2 driving cycle