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 ECM and the ECM uses the CMPS signal for synchronizing the firing of sequential fuel injectors.
Checking oputput signals from CMP during engine running, if the expected number of cam tooth count is not observed, ECM sets P0346.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Signal check |
•
Poor connection
•
Short in harness
•
electrical noise
•
Target wheel
•
CMPS(B2-intake)
•
ECM |
Enable Conditions |
•
Reference mark found
•
No CKP sensor error
•
No 1 tooth off error | |
Threshold value |
•
Unplausible signal counter > 10 times | |
Diagnosis Time |
•
Continuous | |
MIL On Condition |
•
2 driving cycles |
Fig 1) Normal waveform of IN-CMPS & EX-CMPS at idle.
