P0366
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.
DTC Description
P0336 is set when 1). engine speed detected by CKPS is above 6000RPM, or 2). CKPS signal pulse is abnormal. For repair, check temporary poor connection in CKPS circuit, component failure or deformation of tone wheel.
Fig 1) This shows waveform of Crank Shaft Position Sensor and Cam Shaft Position Sensor simulatneously. The middle area indicates reference points of Crank Shaft Position Sensor and Cam Shaft Position Sensor.
Fig 2) Crank Shaft Position Sensor and Cam Shaft Position Sensor signal are measured simultaneously. Cam Shaft Position Sensor signal is outputted once when Crank Shaft Position sensor signal is outputted twice. LOW and HIGH output of Cam Shaft Position sensor reference point is detected at Crank Shaft Position sensor reference point.
( Injection sequence is determined based on LOW and HIGH signal of Cam Shaft Position Sensor reference point as detecting cylinder position.)
※ Signal Analysis
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)
crank.PNG
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