Code No. P0340: Camshaft Position Sensor System










OPERATION



  • Power is supplied to the camshaft position sensor (terminal No. 3) from the engine control relay (terminal No. 1) and is earthed to the engine-ECU <M/T> or engine-A/T-ECU <A/T> (terminal No. 88) from the camshaft position sensor (terminal No. 1).
  • A power voltage of 5 V is applied to the camshaft position sensor output terminal (terminal No. 2) from the engine-ECU <M/T> or engine-A/T-ECU <A/T> (terminal No. 71).

FUNCTION



  • The camshaft position sensor detects the top dead centre on the compression stroke of the No. 1 cylinder and inputs a pulse signal to the engine-ECU <M/T> or engine-A/T-ECU <A/T>.

TROUBLE JUDGMENT


Check Condition
  • Engine speed is 50 r/min or higher.
Judgment Criterion
  • Camshaft position sensor output voltage has not been changed (no pulse signal is has been input) for 2 seconds.

PROBABLE CAUSES



  • Failed camshaft position sensor
  • Open/short circuit in camshaft position sensor circuit or loose connector contact
  • Failed engine-ECU <M/T> or engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-38 camshaft position sensor connector

Q. Is the check result normal?

Go to Step 2.
Repair or replace the connector.

STEP 2. Perform voltage measurement at B-38 camshaft position sensor connector.

  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 3 and earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 4.
Go to Step 3.

STEP 3. Connector check: B-15X engine control relay connector

Q. Is the check result normal?


    Check intermediate connector B-135, and repair if necessary. If intermediate connector is normal, check and repair harness between B-38 (terminal No. 3) camshaft position sensor connector and B-15X (terminal No. 1) engine control relay connector.

    • Check power supply line for open/short circuit.
Repair or replace the connector.

STEP 4. Perform voltage measurement at B-38 camshaft position sensor connector.

  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 2 and earth.
OK: 4.9 - 5.1 V

Q. Is the check result normal?

Go to Step 10.
Go to Step 5.

STEP 5. Perform voltage measurement at D-245 engine-ECU <M/T> connector or D-216 engine-A/T-ECU <A/T> connector.

  • Measure engine-ECU <M/T> or engine-A/T-ECU <A/T> terminal voltage.
  • Disconnect B-38 camshaft position sensor connector.
  • Ignition switch: ON
  • Voltage between terminal No. 71 and earth.
OK: 4.9 - 5.1 V

Q. Is the check result normal?

Go to Step 6.
Go to Step 7.

STEP 6. Connector check: D-245 engine-ECU <M/T> connector or D-216 engine-A/T-ECU <A/T> connector

Q. Is the check result normal?


    Check intermediate connector B-135, and repair if necessary. If intermediate connector is normal, check and repair harness between B-38 (terminal No. 2) camshaft position sensor connector and D-245 (terminal No. 71) engine-ECU <M/T> connector or D-216 (terminal No. 71) engine-A/T-ECU <A/T> connector.

    • Check output line for open circuit.
Repair or replace the connector.

STEP 7. Connector check: D-245 engine-ECU <M/T> connector or D-216 engine-A/T-ECU <A/T> connector

Q. Is the check result normal?

Go to Step 8.
Repair or replace the connector.

STEP 8. Check harness between B-38 (terminal No. 2) camshaft position sensor connector and D-245 (terminal No. 71) engine-ECU <M/T> connector or D-216 (terminal No. 71) engine-A/T-ECU <A/T> connector.
note Before checking harness, check intermediate connector B-135, and repair if necessary.

  • Check output line for short circuit.

Q. Is the check result normal?

Go to Step 9.
Repair the damaged harness wire.

STEP 9. Check the trouble symptoms.

Q. Does trouble symptom persist?
Replace the engine-ECU <M/T> or engine-A/T-ECU <A/T>.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 10. Perform resistance measurement at B-38 camshaft position sensor connector.

  • Disconnect connector, and measure at harness side.
  • Resistance between terminal No. 1 and earth.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?

Go to Step 13.
Go to Step 11.

STEP 11. Connector check: D-245 engine-ECU <M/T> connector or D-216 engine-A/T-ECU <A/T> connector

Q. Is the check result normal?

Go to Step 12.
Repair or replace the connector.

STEP 12. Check harness between B-38 (terminal No. 1) camshaft position sensor connector and D-245 (terminal No. 88) engine-ECU <M/T> connector or D-216 (terminal No. 88) engine-A/T-ECU connector.
note Before checking harness, check intermediate connectors B-135 and D-111, and repair if necessary.

  • Check earthing line for open circuit and damage.

Q. Is the check result normal?

Go to Step 9.
Repair the damaged harness wire.

STEP 13. Perform output wave pattern measurement at B-38 camshaft position sensor connector (Using an oscilloscope).

  • Use special tool test harness (MB991709) to connect connector, and measure at pick-up harness.
  • Engine: Idling
  • Transmission: Neutral <M/T> or P range <A/T>
  • Voltage between terminal No. 2 and 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 with no noise in waveform.

Q. Is the check result normal?

Go to Step 9.
Go to Step 14.

STEP 14. Connector check: B-15X engine control relay connector.

Q. Is the check result normal?

Go to Step 15.
Repair or replace the connector.

STEP 15. Check harness between B-38 (terminal No. 3) camshaft position sensor connector and B-15X (terminal No. 1) engine control relay connector.
note Before checking harness, check intermediate connector B-135, and repair if necessary.

  • Check power supply line for damage.

Q. Is the check result normal?

Go to Step 16.
Repair the damaged harness wire.

STEP 16. Connector check: D-245 engine-ECU <M/T> connector or D-216 engine-A/T-ECU <A/T> connector

Q. Is the check result normal?

Go to Step 17.
Repair or replace the connector.

STEP 17. Check harness between B-38 (terminal No. 2) camshaft position sensor connector and D-245 (terminal No. 71) engine-ECU <M/T> connector or D-216 (terminal No. 71) engine-A/T-ECU <A/T> connector.
note Before checking harness, check intermediate connector B-135, and repair if necessary.

  • Check output line for damage.

Q. Is the check result normal?

Go to Step 18.
Repair the damaged harness wire.

STEP 18. Check harness between B-38 (terminal No. 1) camshaft position sensor connector and D-245 (terminal No. 88) engine-ECU <M/T> connector or D-216 (terminal No. 88) engine-A/T-ECU connector.
note Before checking harness, check intermediate connectors B-135 and D-111, and repair if necessary.

  • Check earthing line for damage.

Q. Is the check result normal?

Go to Step 19.
Repair the damaged harness wire.

STEP 19. Check camshaft position sensing cylinder.

Q. Is the check result normal?

Go to Step 20.
Replace the camshaft position sensing cylinder.

STEP 20. Check the trouble symptoms.

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