Variable Cam Timing (VCT) Monitor

The VCT output driver in the powertrain control module (PCM) is checked electrically for opens and shorts. The VCT system is checked functionally by monitoring the closed loop cam position error correction. If the proper cam position can not be maintained and the system has an advance or retard error greater than the malfunction threshold, a VCT control malfunction is indicated.

For additional VCT information, refer to VARIABLE CAM TIMING (VCT) SYSTEM .