Variable Valve Timing Actuator: Testing and Inspection

CVVT OIL CONTROL VALVE (OCV)

INSPECTION

FUNCTION AND OPERATION PRINCIPLE




The Continuously Variable Valve Timing (CVVT) system controls the amount of valve overlap by varying the amount of oil flow into an assembly mounted on each intake camshaft through PCM control of an oil control valve. This system uses two oil control valves, one on each bank. An Oil Temperature Sensor (OTS) is used to allow PCM monitoring of engine oil temperature. As oil is directed into the chambers of the CVVT assembly, the cam phase is changed to suit various performance and emissions requirements.

1. When camshaft rotates in the direction of engine rotation: Intake-Advance/Exhaust-Retard
2. When camshaft rotates in the opposite direction of engine rotation: Intake- Retard/Exhaust- Advance

SPECIFICATION
Item Specification
Coil Resistance (ohm) 1 6.7 - 7.7 ohms at 20 °C (68 °F)

Circuit Diagram:

CIRCUIT DIAGRAM

COMPONENT INSPECTION
1. Turn ignition switch OFF.
2. Disconnect OCV connector




3. Measure resistance between OCV terminals 1 and 2.
4. Check that the resistance is within the specification.

Specification: Refer to SPECIFICATION.

INSTALLATION






CAUTION: If the OCVs are installed incorrectly, the vehicle may be damaged. So when installing them, ensure the OCV and harness connector colors match(Components and harness side).