Inspection Procedure 11: Camshaft Position Sensor System








OPERATION



  • Power is supplied to the camshaft position sensor (terminal No. 1) from the engine-ECU (terminal No. 91) and is earthed to the engine-ECU (terminal No. 86) from the crank angle sensor (terminal No. 3).
  • A power voltage of 5 V is applied to the camshaft position sensor output terminal (terminal No. 2) from the engine-ECU (terminal No. 98).

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.

PROBABLE CAUSES



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

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-101 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-101 camshaft position sensor connector.

  • Disconnect connector, and measure at the 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 6 .
Go to Step 3 .

STEP 3. Connector check: B-17 engine-ECU connector

Q. Is the check result normal?

Go to Step 4 .
Repair or replace the connector.

STEP 4. Check harness between B-101 (terminal No. 2) camshaft position sensor connector and B-17 (terminal No. 98) engine-ECU connector.

  • Check output line for open/short circuit.

Q. Is the check result normal?

Go to Step 5 .
Repair or replace the connector.

STEP 5. Check the trouble symptoms.

Q. Does trouble symptom persist?

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

STEP 6. Perform voltage measurement at B-101 camshaft position sensor connector.

  • Disconnect connector, and measure at the harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 1 and earth.
OK: 4.9 - 5.1 V

Q. Is the check result normal?

Go to Step 9 .
Go to Step 7 .

STEP 7. Connector check: B-17 engine-ECU connector

Q. Is the check result normal?

Go to Step 8 .
Repair or replace the connector.

STEP 8. Check harness between B-101 (terminal No. 1) camshaft position sensor connector and B-17 (terminal No. 91) engine-ECU connector.

  • Check power supply line for open/short circuit.

Q. Is the check result normal?

Go to Step 5 .
Repair the damaged harness wire.

STEP 9. Perform resistance measurement at B-101 camshaft position sensor connector.

  • Disconnect connector, and measure at the harness side.
  • Resistance between terminal No. 3 and earth.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?

Go to Step 12 .
Go to Step 10 .

STEP 10. Connector check: B-17 engine-ECU connector

Q. Is the check result normal?

Go to Step 11 .
Repair or replace the connector.

STEP 11. Check harness between B-101 (terminal No. 3) camshaft position sensor connector and B-17 (terminal No. 86) engine-ECU connector.

  • Check earthing line for open circuit and damage.

Q. Is the check result normal?

Go to Step 5 .
Repair the damaged harness wire.

STEP 12. Connector check: B-17 engine-ECU connector

Q. Is the check result normal?

Go to Step 13 .
Repair or replace the connector.

STEP 13. Check harness between B-101 (terminal No. 1) camshaft position sensor connector and B-17 (terminal No. 91) engine-ECU connector.

  • Check power supply line for damage.

Q. Is the check result normal?

Go to Step 14 .
Repair the damaged harness wire.

STEP 14. Check harness between B-101 (terminal No. 2) camshaft position sensor connector and B-17 (terminal No. 98) engine-ECU connector.

  • Check output line for damage.

Q. Is the check result normal?

Go to Step 15 .
Repair the damaged harness wire.

STEP 15. Check the ring gear.

Q. Is the check result normal?

Go to Step 16 .
Replace the ring gear.

STEP 16. Replace the camshaft position sensor.

  • After replacing the camshaft position sensor, re-check the trouble symptoms.

Q. Does trouble symptom persist?

Replace the engine-ECU.
The check is end.