The Camshaft Position Sensor (CMPS) is a sensor that detects the compression TDC of the NO. 1 cylinder.
The CMPS consists of a hall type sensor and a target on the end of the intake camshaft.
When the target triggers the sensor, the sensor voltage is 5V. If not, the sensor voltage is 0V. These CMPS signal is sent to the PCM and the PCM uses the CMPS signal for synchronizing the firing of sequential fuel injectors.
The PCM monitors the camshaft sensor signal transition position which must change only once per crankshaft revolution.
If no camshaft signal is detected while crankshaft signal is detected, the PCM sets DTC P0340.
ITEM | DETECTING CONDITION | POSSIBLE CAUSE |
DTC Strategy | ● Check camshaft signal switching | ● Open or short in signal, ground or power supply circuit. ● Contact resistance in connectors. ● Misadjust crankshaft and camshaft pulley position. ● Faulty CMP sensor. |
Enable Conditions | ● No crankshaft position sensor signal error ● 6V＜Battery voltage＜16V | |
Threshold Value | ● No signal switching ●Rising/falling camshaft edge not within defined window : -5 ~ +5 teeth | |
Diagnostic Time | ● 40 revolutions |
