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 divided with 58 teeth and 2 missing teeth (reference 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.

DTC P0335 is set corresponding to the condition of ECM internal counter when CKPS signal does not generate 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.

Fig.1) This shows waveform of CKPS and CMPS simultaneously. The middle area indicates reference points of CKPS and CMPS.

☞ Injection sequence is determined based on Low and High signal of CMPS reference point as detecting cylinder position.

1.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.

2.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.

3. 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)