Theory of Operation
WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
Variable Cam Timing (VCT) allows the Powertrain Control Module (PCM) to monitor and adjust the position of the camshaft, based on desired torque levels and engine operating conditions. The camshaft design allows for the exhaust lobes to be adjusted while the intake lobes are not adjustable all on one camshaft. The PCM controls a solenoid operated control valve, that is used to direct oil pressure to hydraulic actuator mounted between the camshaft and its driving sprocket. The oil pressure alters the angular position or phasing of the camshaft relative to crankshaft rotation. A sensor is used to monitor the position of the camshaft.