Code No. P0340: Camshaft Position Sensor System




OPERATION




FUNCTION




TROUBLE JUDGEMENT


Check Conditions
Judgement Criterion
Check Conditions
Judgement Criterion

FAIL-SAFE AND BACKUP FUNCTION




PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. Perform voltage measurement at camshaft position sensor connector.



  • Disconnect connector, and measure at harness side.
  • Power supply mode of electric motor switch: ACC
  • Voltage between terminal engine-ECU CPI line and body earth.
OK: 4.9 - 5.1 V

Q. Is the check result normal?

Go to Step 4.
Go to Step 2.

STEP 2. Check harness between camshaft position sensor connector terminal and engine-ECU connector terminal CPI.



  • Check output line for open/short circuit.

Q. Is the check result normal?

Go to Step 3.
Repair or replace the connector, or repair the damaged harness wire.

STEP 3. M.U.T.-III diagnosis code



  • Reconfirmation of diagnosis code.

Q. Is the diagnosis code stored?

Replace the engine-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 4. Perform voltage measurement at camshaft position sensor connector.



  • Disconnect connector, and measure at harness side.
  • Power supply mode of electric motor switch: ACC
  • Voltage between terminal engine-ECU 5V line and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 6.
Go to Step 5.

STEP 5. Check harness between camshaft position sensor connector terminal and engine-ECU connector terminal 5V.



  • Check power supply line for open/short circuit.

Q. Is the check result normal?

Go to Step 3.
Repair or replace the connector, or repair the damaged harness wire.

STEP 6. Perform resistance measurement at camshaft position sensor connector.



  • Disconnect connector, and measure at harness side.
  • Resistance between terminal engine-ECU CPIE line and earth.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?

Go to Step 8.
Go to Step 7.

STEP 7. Check harness between camshaft position sensor connector terminal and engine-ECU connector terminal CPIE.



  • Check earthing line for open circuit and damage.

Q. Is the check result normal?

Go to Step 3.
Repair or replace the connector, or repair the damaged harness wire.

STEP 8. Perform output wave pattern measurement at camshaft position sensor connector (Using an oscilloscope).



  • Use special tool test harness (MB991709) to connect connector, and measure at pick-up harness.
  • Set the vehicle to the continuous idling mode.
  • Select lever position indicator: P
  • Voltage between terminal engine-ECU CPI line and body earth.
OK: Waveforms should be displayed on inspection procedure using an oscilloscope (Refer to ), its maximum value should be 4.8 V or more, and its minimum value should be 0.6 V or less. There must be no noise in the output wave pattern.

Q. Is the check result normal?

Go to Step 3.
Go to Step 9.

STEP 9. Check harness between camshaft position sensor connector terminal and engine-ECU connector terminal 5V.



  • Check power supply line for damage.

Q. Is the check result normal?

Go to Step 10.
Repair or replace the connector, or repair the damaged harness wire.

STEP 10. Check harness between camshaft position sensor connector terminal and engine-ECU connector terminal CPI.



  • Check output line for damage.

Q. Is the check result normal?

Go to Step 11.
Repair the damaged harness wire.

STEP 11. Check inlet camshaft sensing position.


Q. Is the check result normal?

Go to Step 12.
Replace the inlet camshaft.

STEP 12. M.U.T.-III diagnosis code



  • Reconfirmation of diagnosis code.

Q. Is the diagnosis code stored?

Replace the camshaft position sensor.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).