Savana 3500 V8-4.8L (2009)
The CMP actuator magnet (752) is located in the engine front cover and is sealed by a gasket (753). The CMP actuator magnet is controlled by a 12-volt
150 Hz pulse width 0-100 percent duty cycle signal from the ECM. When energized, the solenoid uses electromagnetic force on the magnet pintle to
position the spool valve of the CMP solenoid valve.
CMP Actuator
The CMP actuator is a vane type design that hydraulically changes angle or timing of the camshaft relative to crankshaft position. The CMP actuator
allows earlier or later intake and exhaust valve opening during the 4-stroke engine cycle. The CMP actuator cannot vary the duration of valve opening or
valve lift. The CMP actuator is to be serviced as an assembly. For system operation, refer to Camshaft Actuator System Description (See: Powertrain
Management/Computers and Control Systems/Description and Operation/Camshaft Actuator System Description).
The CMP actuator consists of the CMP reluctor wheel (1), wheel retaining pins (2), return spring (3), front cover (4), park position pin (5), park position
pin spring (6), vanes and vane springs (7), rotor (8), housing with chain sprocket (9), sealing cover/thrust plate (10), and bolts (11).
CMP System Operation