The Crankshaft Position Sensor (CKPS) is a hall effect 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 ECM 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 ECM identifies which cylinder is at top dead center.
The ECM sets DTC P0336 when the number of crankshaft teeth during one revolution is more than reference number.
Item
Detecting Condition
Possible cause
Monitoring Strategy
? Reference mark check
? poor connections
? Faulty target wheel tolerance
? Out of allowable air gap
? Faulty CKPS
? Faulty ECM
Threshold value
? No reference mark : > 20times
Enable Conditions
? Vehicle speed : < 1kph or 25kph
? Idle engine speed : > Target speed - 100rpm
Diagnostic Time
? Continuous
Fail Safe
? None
This figure shows the waveform measured at terminal 2 of CKPS.
In section ? there are 2 missing teeth which is used as reference point in judging TDC.
The section ? is one tooth interval of 60 teeth which has an angle of 6 degree.
While inspecting signal waveform,check if there is missing teeth or lower signal than threshhold.