Crank Shaft Position Sensor(CKPS) is magnetic inductive type. Mounted on cylinder block, it senses tone wheel position of crank shaft. As tone wheel is devided with 58 teeth and 2 missing teeth (referrence point), 1 tooth corresponds to 6 degree. CKPS which calculates RPM and crank angle is important to determine fuel injection quantity and injection timing with APS. Crank shaft position is closely related to engine starting.
P0335 is set when CKPS signal does not generate for more than 0.7 sec. while CMPS signal is outputted. This code is due to CKPS circuit or component failure. If CKPS signal is not inputted during driving, RPM is calculated based on CMPS signal.
Item | Detecting Condition | Possible Cause | ||
DTC Strategy | ● Signal monitoring | ● CKPS circuit ● CKPS component ● Abnormal deformation of Crank Shaft tone wheel | ||
Enable Conditions | ● During accelerating and turning engine "ON" | |||
Threshold Value | ● CMPS signal is outputted while CKPS signal does not generate. | |||
Diagnostic Time | ● Tone wheel rotates 4 times | |||
Fail Safe | Fuel Cut | YES | ● RPM is considered as double speed of CAM rotation. | |
EGR Off | NO | |||
Fuel Limit | NO | |||
Check Lamp | ON | |||
Sensor Type | Output Signal Characteristic | Air Gab | Low RPM Minimum Detecting Voltage | High RPM Minimum Detecting Voltage |
Magnetic inductive | A/C waveform | 1.8mm | 230mV | 2769 mV |
The output voltage of CKPS signal varies according to rpm(the speed of tone wheel passing by sensor)
( low voltage is inducted for low speed and high voltage is inducted for high speed. )
CKPS should detect from low rpm at cranking to above 5000rpm. If minimum detecting voltage is set low for the ease of signal detection at low rpm, 1) the abnormal signal at high rpm from which high voltage generates or 2) electrical NOise through circuit can be recognized as Crank signal. Thus minimum detecting voltages at low rpm and high rpm are set differently.
ECM convert analog signal like the waveform illustrated above into digital signal with A/D converter.The voltage above minimum detecting voltage of crank signal and "-"voltage below 0.0V is meaningless at converting process. RPM is detected as Hz.(signal detecting period)
