Circuit Description

The Variable Valve Timing (VVT) system controls intake valve timing in response to driving conditions. ECM controls Variable Valve Timing (VVT) Oil Control Valve (OCV) to ensure correct intake valve timing. Engine oil pressure which is controlled by VVT OCV is supplied to VVT controller on front of intake camshaft. VVT controller changes relative position between camshaft and crankshaft. VVT OCV may also be referred to as VVT camshaft timing oil control valve. DTC is set if ECM detects valve timing remains fixed and does not change when engine is at normal operating temperature and engine speed is 400-4000 RPM. Possible causes are:

• Incorrect valve timing.
• Defective VVT OCV.
• Defective VVT controller.
• Defective ECM.