Code No. P0340: Camshaft Position Sensor System

OPERATION

Power is supplied to the camshaft position sensor (terminal No. 1) from the engine-ECU (terminal No. 9) and is earthed to the engine-ECU (terminal No. 30) from the camshaft position sensor (terminal No. 2).
A power voltage of 5 V is applied to the camshaft position sensor output terminal (terminal No. 3) from the engine-ECU (terminal No. 14).

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-ECU.

TROUBLE JUDGMENT

Check Condition

Engine speed is higher than 50 r/min.

Judgment Criterion

Normal signal pattern has not been input for cylinder identification from the crankshaft position sensor signal and camshaft position sensor signal for 2 seconds.

Check Condition

Engine speed is higher than 500 r/min.

Judgment Criterion

Camshaft position sensor output voltage has not changed (no pulse signal is input) for 2 seconds.

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 harness side.
Ignition switch: ON
Voltage between terminal No. 3 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-29 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. 3) camshaft position sensor connector and B-29 (terminal No. 14) engine-ECU connector.

Check output line for open/short circuit.

Q. Is the check result normal?

	Go to Step 5 .

	Repair the damaged harness wire.

STEP 5. M.U.T.-III diagnosis code

Reconfirmation of diagnosis code.

Q. Is diagnosis code set?

	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 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-29 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-29 (terminal No. 9) 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 harness side.
Resistance between terminal No. 2 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-29 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. 2) camshaft position sensor connector and B-29 (terminal No. 30) 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. Perform output wave pattern measurement at B-101 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. 3 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.There must be no noise in the output wave pattern.

Q. Is the check result normal?

	Go to Step 5 .

	Go to Step 13 .

STEP 13. Connector check: B-29 engine-ECU connector

Q. Is the check result normal?

	Go to Step 14 .

	Repair or replace the connector.

STEP 14. Check harness between B-101 (terminal No. 1) camshaft position sensor connector and B-29 (terminal No. 9) engine-ECU connector.

Check power supply line for damage.

Q. Is the check result normal?

	Go to Step 15 .

	Repair the damaged harness wire.

STEP 15. Check harness between B-101 (terminal No. 3) camshaft position sensor connector and B-29 (terminal No. 14) engine-ECU connector.

Check output line for damage.

Q. Is the check result normal?

	Go to Step 16 .

	Repair the damaged harness wire.

STEP 16. Check camshaft sensing cylinder.

Q. Is the check result normal?

	Go to Step 17 .

	Replace the camshaft sensing cylinder.

STEP 17. M.U.T.-III diagnosis code

Reconfirmation of diagnosis code.

Q. Is 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 ).