P0342

DTC P0342 CAMSHAFT POSITION SENSOR A CIRCUIT LOW INPUT

Component Location:

COMPONENT LOCATION

GENERAL DESCRIPTION
The Camshaft Position Sensor (CMPS) is a sensor that detects the compression TDC of the N0.1 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 5 V. If not, the sensor voltage is 0 V. These CMPS signal is sent to the PCM and the PCM uses the CMPS signal for synchronizing the firing of sequential fuel injectors.

DTC DESCRIPTION
If the output voltage of CMPS remains low when the change of CKPS output voltage is zero, the PCM determines that a fault exists and a DTC is stored.

DTC Detecting Condition:

Signal Waveform:

Schematic Diagram:

MONITOR SCANTOOL DATA
1. Engine "ON"




2. Connect scantool and monitor "Signal waveform of CMPS"
3. Is the signal waveform of CMPS is correctly operating ?

YES: Fault is intermittent caused by poor contact in the sensor's and/or PCM's connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification vehicle Repair" procedure.

NO: Go to "W/Harness Inspection" procedure.

TERMINAL & CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?

YES: Repair as necessary and go to "Verification of Vehicle Repair" procedure.

NO: Go to " Power Circuit Inspection "procedure.

POWER SUPPLY CIRCUIT INSPECTION
1. Check Power Supply
1. Ignition "OFF"
2. Disconnect CMPS connector.
3. Ignition " ON " & Engine "OFF"




4. Measure voltage between terminal "3" of MAF sensor harness connector and chassis ground.
Specification: B+

5. Is the measured voltage within specifications?

YES: Go to Check CMPS Power as below.

NO:
- Check open or short to ground in harness between control relay and CMPS.
- Repair or replace as necessary and then, go to " Verification of Vehicle Repair" procedure.

2. Check CMPS Power
1. Ignition "OFF"
2. Disconnect CMPS connector.
3. Ignition "ON" & Engine "OFF"




4. Measure voltage between terminal "2" of CMPS harness connector and chassis ground.
Specification: 5 V

5. Is the measured voltage within specifications?

YES: Go to " Component Inspection " procedure.

NO: Go to "Signal Circuit Inspection" procedure.

SIGNAL CIRCUIT INSPECTION
1. Check for short to ground in harness
1. Ignition "OFF"
2. Disconnect CMPS connector.




3. Measure resistance between terminal "2" of CMPS harness connector and chassis ground.
Specification: Infinite

4. Is the measured resistance within specifications?

YES: Go to" Component Inspection "procedure.

NO:
- Check short to ground in signal harness.
- Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.

COMPONENT INSPECTION
1. Check CMPS
1. Connect CMPS and PCM connector.
2. Engine "ON"




3. Check the signal waveform of CMPS on scantool.
Check whether the waveform is synchronized with Crankshaft Position Sensor or not.

4. Is the signal waveform normal?

YES:
- Substitute with a known - good PCM and check for proper operation.
- If the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure.

NO:
- Substitute with a known - good CKPS and check for proper operation.
- If the problem is corrected, replace CKPS and go to "Verification of Vehicle Repair" procedure.

VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Monitor and record the Freeze Frame Data for the Diagnostic Trouble Code(DTC) which has been diagnosed.
2. Using a Scantool, Clear the DTCs.
3. Operate the vehicle within conditions noted in the freeze frame data or enable conditions.
4. Monitor that all readiness tests have been verified as "Complete"
5. Are any DTCs present?

YES: Go to the applicable troubleshooting procedure.

NO: System is performing to specification at this time.