Valve Deactivation Solenoid: Description and Operation
SOLENOID-MDSDESCRIPTION
The Multi Displacement System selectively deactivates cylinders 1,4,6, and 7, to improve fuel economy. It has two modes of operation:
^ 8 cylinders for acceleration and heavy loads.
^ 4 cylinders for cruising and city traffic.
The main components of the Multi Displacement System are
^ Unique MDS camshaft.
^ Deactivating roller tappets.
^ 4 control valves/solenoids.
^ control valve/solenoid wiring harness.
^ oil temp sensor.
OPERATION
Cylinder Deactivation
^ Trap an exhaust charge from a normal combustion event
^ Normal combustion event
^ Don't open the exhaust valve
^ Don't open the intake valve
^ Piston is an air spring
^ Cylinders deactivated in firing sequence
Cylinder Reactivation
^ Open the exhaust valve
^ Empty the cylinder
^ Open the intake valve
^ Normal combustion event
^ Cylinders reactivated in firing sequence