Symptoms

- Engine Light ON (or Service Engine Soon Warning Light) - Lack/Loss of power - Engine rough idle

Possible Causes

- Dirty Oil - Low engine oil level - Valve Timing Control (VTC) open or shorted circuit. - Valve Timing Control (VTC) electrical connector - Faulty Valve Timing Control (VTC) - Damaged ECM

Description

The Engine Control Module (ECM) optimizes the valve timing using the Valve Timing Control (VTC). The ECM sends a target duty cycle control signal to the VTC. This control signal regulates the oil pressure supplied to the VTC. The VTC can advance or retard the engine timing.