Variable Cam Timing (VCT) Monitor
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
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 .