Component Location
Description
1. General Description
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.
2. DTC Description
The ECM monitors the camshaft sensor signal tranisiton position which must change only once per crankshaft revolution. If no camshaft signal is detected while crankshaft signal is detected, the ECM sets DTC P0340.
DTC Detecting Condition
Item | Detecting Condition | Possible cause |
Monitoring Strategy | ? 1. Signal check High ? 2. Signal check Low ? 3. Signal interruption ? 4. Rationality check | ? Open power line ? Open signal line ? Open ground line ? Short between signal and power line ? Faulty CMPS ? Faulty ECM |
Threshold value | 1 | ? Slope of phase signal = 225dez : > 12times |
2 | ? Slope of phase signal = 0 : 12times |
3 | ? B_mxph or B_mnph and Edge detected : > 12times |
4 | ? Slope of phase signal = 225 , >0 , ?85 , ?170 : > 12times |
Enable Conditions | |
Diagnostic Time | ? 5 sec |
MIL on condition | ? 2 driving cycle |
Schematic Diagram
Signal Waveform
This figure shows the waveform measured at terminal 2 of CMPS.
Make sure there is any missing tooth or noise while changing RPM.
The waveform must be displayed regularly.
HI level at point ? should be over 4.1V and LOW level at point ? should be below 0.8V.
Is Sensor Switching Properly?
While cranking the engine,if the fform with scan tool is displayed similarly as shown in the figure,CMPS works properly.
In case there is no symptom and wrong data but DTC is shown |
The problem may be intermittent so slightly shake the connector and harness vertically and horizontally to check if there is any data changes |
If the data changes normally, the problem was intermittent so erase DTC and verify the same DTC reoccure. Go to "Terminal and Connector inspection" procedure. |
In case there is symptom and wrong data with DTC |
Check open,short or connector’s connection for CMPS. |
Check the deterioration of CMPS performance. Go to "circuit inspection" procedure. |
Signal Waveform
This figure shows the waveform measured at terminal 2 of CMPS.
Make sure there is any missing tooth or noise while changing RPM.
The waveform must be displayed regularly.
HI level at point ? should be over 4.1V and LOW level at point ? should be below 0.8V.