Cam Shaft Position Sensor(CMPS) is hall sensor type. Sensing the teeth attatch at the end of exhaust cam shaft, CMPS detects rotation of Cam shaft (1 signal per 1 lotation)
As Cam shaft rotates once while Crank shaft does twice, CMPS referrence point generates once while CKPS’ do twice.
As this signal inputted to ECM, it distinguishes crank angle and the cylinder which requires fuel injection in order to determine injection sequence and duration.
P0341 is set when CMPS reference point is detected more or less than twice while CKPS reference point is recognized 4 times. This code is due to temporary poor connection or short to ground in CMPS circuit. CMPS component failure.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Signal monitoring
? CMPS circuit
? CMPS component
Enable Conditions
? During accelerating and turning engine "ON"
Threshold Value
? When RPM from CMPS correlates with RPM from CKPS abnormally.
Diagnostic Time
? Crank Shaft rotates 4 times
Fail Safe
Fuel Cut
YES
EGR Off
NO
Fuel Limit
Check Lamp
Sensor Type
Output Signal Characteristic
Air Gab
LOW Signal Detecting Voltage
HIGH Signal Detecting Voltage
Hall effect type
0V~5V Digital signal output
1.25mm
Below 2.0V
Above 3.8V
? Signal Analysis
ECM recognizes HIGH signal as LOW signal when CMPS signal drops below 2.0V and LOW signal as HIGH signal when CMPS signal rises above 3.8V.
V0 - the Minimum voltage of LOW signal does not drop below 0.0V due to the hall sensor inside resistance. When the Minimum voltage of LOW signal is above 0.6V during signal waveform inspection, check excessive resistance inside of CMPS component or in ground circuit.