Variable Valve Timing Actuator: Testing and Inspection

ENGINE OIL CONTROL VALVE CHECK

Required Special Tool:

- MB991658: Test Harness

Intake engine oil control valve

[Checking the Operation Sound]

1. Disconnect the intake engine oil control valve connector.





2.
CAUTION:
To prevent the coil from burning, keep the duration of the voltage application as short as possible.

Check that the operation sound of the intake engine oil control valve can be heard when the positive battery voltage is supplied to the intake engine oil control valve. (Use the special tool MB991658 to connect terminal No. 2 of the intake engine oil control valve connector to the positive battery terminal and terminal No. 1 to the negative battery terminal.)
3. If the operation sound cannot be heard, replace the intake engine oil control valve.

[Checking the Coil Resistance]

1. Disconnect the intake engine oil control valve connector.





2. Measure the resistance between terminals.
Standard value: 6.9 - 7.9 ohms [at 20°C (68°F)]
3. If the resistance is not within the standard value, replace the intake engine oil control valve.

Exhaust engine oil control valve

[Checking the Operation Sound]

1. Disconnect the exhaust engine oil control valve connector.





2.
CAUTION:
To prevent the coil from burning, keep the duration of the voltage application as short as possible.

Check that the operation sound of the exhaust engine oil control valve can be heard when the positive battery voltage is supplied to the exhaust engine oil control valve. (Use the special tool MB991658 to connect terminal No. 2 of the exhaust engine oil control valve connector to the positive battery terminal and terminal No. 1 to the negative battery terminal.)
3. If the operation sound cannot be heard, replace the exhaust engine oil control valve.

[Checking the Coil Resistance]

1. Disconnect the exhaust engine oil control valve connector.





2. Measure the resistance between terminals.
Standard value: 6.9 - 7.9 ohms [at 20°C (68°F)]
3. If the resistance is not within the standard value, replace the exhaust engine oil control valve.