Circuit Description
The variable valve timing (VVT) system controls the intake valve timing to proper timing in response to driving condition. The engine control module (ECM) controls the oil control valve (OCV) to make the intake valve timing properly, and, oil pressure controlled with OCV is supplied to the VVT controller, and then, VVT controller changes relative position between the camshaft and the crankshaft. Possible causes are
- Open or short in OCV circuit.
- Defective OCV.
- Defective ECM.