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.
If ECM detects that cam event signal count is over 3 under detecting condition, ECM sets P0340. And MIL(Malfunction Indication Lamp) turns on.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Check if CAM sensor is synchronized correctly | 1. Poor connection 2. Open in harness 3. CMPS(B1-Intake) 4. ECM |
Enable Conditions |
•
Engine running state | |
Threshold value |
•
CAM event signal count ≥ 3 | |
Diagnosis Time |
•
Continuous | |
MIL On Condition |
•
1 Driving Cycles |
Item | Specification | |
Output Voltage(V) | Hi : 5.0V | Low : 0.7V |
Airgap(mm) | 0.5 ~ 1.5 | |
Fig.1) Normal waveforms of CKPS & CMPS
