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-A/T-ECU (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-A/T-ECU (terminal No. 71).

FUNCTION



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

TROUBLE JUDGMENT


Check Condition
  • Engine speed is more than approximately 50 r/min.
Judgment Criterion
  • The camshaft position sensor output voltage does not vary (no pulse signal input) for 2 seconds.

PROBABLE CAUSES



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

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-06, 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-216 engine-A/T-ECU connector.

  • Measure engine-A/T-ECU 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-216 engine-A/T-ECU connector

Q. Is the check result normal?


    Check intermediate connector B-06, 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-216 (terminal No. 71) engine-A/T-ECU connector.

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

STEP 7. Connector check: D-216 engine-A/T-ECU 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-216 (terminal No. 71) engine-A/T-ECU connector.
note Before checking harness, check intermediate connector B-06, 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. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.

Q. Is the diagnosis code set?
Replace the engine-A/T-ECU.
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-216 engine-A/T-ECU 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-216 (terminal No. 88) engine-A/T-ECU connector.
note Before checking harness, check intermediate connectors B-06 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: P range
  • 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-06, 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-216 engine-A/T-ECU 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-216 (terminal No. 71) engine-A/T-ECU connector.
note Before checking harness, check intermediate connector B-06, 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-216 (terminal No. 88) engine-A/T-ECU connector.
note Before checking harness, check intermediate connectors B-06 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. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.

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