A Crankshaft Position Sensor (CKPS) is a magnetic type sensor that generates voltage using a sensor and a target wheel mounted on the crankshaft. The ECM calculates engine RPM by using the sensor’ s signal and controls the injection duration and the ignition timing.Camshaft Position Sensor (CMPS) is a hall sensor and detects the camshaft position by using a hall element. It is related with Crankshaft Position Sensor (CKPS) and detects the piston position of the each cylinder which the CKPS can’t detect. This CMPS signal is sent to the ECM and it uses CMPS signals for determining the ignition timing with CKPS signals. CMPS makes Sequential Injection possible.
If the deviation between CKPS and CMPS is bigger than the threshold value, ECM sets DTC P0016.
Item
Detecting Condition
Possible Cause
DTC Strategy
Camshaft and crankshaft alignment check
Poor connection
Contamination of Oil / Clog of Oil path
CKPS, CMPS
OCV
CVVT
Case1
Enable
Conditions
Reference position adaptation requsted by external tester connected
Threshold Value
|Difference between adapted Reference position and design specification | >15°CA
Diagnostic Time
2 sec
Case2
Target valve timing = Reference valve timing, for more than 2 sec
No electrical error of OCV
Reference position adaptation completed
No CMP sensor error & No CKP sensor error
| Average difference between Adapted reference position and currently measured position | >15°CA
2.6 sec
MIL On Condition
DTC only
This example shows a typical Crankshaft Position Sensor(CkPS) and Camshaft Position Sensor(CMPS) waveform at idle. The ECM controls the injection and 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.