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.
This DTC is set if there is no change of signal.
Item
Detecting Condition
Possible Cause
DTC Strategy
? change in output voltage(?Vcam) is monitored
? Poor connection
? Open or short in CMPS
? Faulty CMPS
? Faulty PCM
Enable Conditions
? Cranking switch "ON"
Threshold value
? ?Vcam = 0
Diagnostic Time
? Continuous
MIL ON condition
? 2 driving cycles
Fig1) The given data is the normal waveform of the Crankshaft Position Sensor(CKPS) and Camshaft Position Sensor(CMPS) at idle. The PCM controls the injection timing and the ignition timing by using these signals. Generally CKPS signal is used to detect the piston’s position and CMPS signal is used to detect the Top Dead Center of each cylinder.