RAM 1500 Truck 2WD V8-5.7L VIN 2 (2006)
Valve Deactivation Solenoid: Description and Operation
SOLENOID-MDS
DESCRIPTION
The Multi Displacement System selectively deactivates cylinders 1,4,6, and 7, to improve fuel economy. It has two modes of operation:
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8 cylinders for acceleration and heavy loads.
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4 cylinders for cruising and city traffic.
The main components of the Multi Displacement System are
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Unique MDS camshaft.
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Deactivating roller tappets.
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4 control valves/solenoids.
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control valve/solenoid wiring harness.
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oil temp sensor.
OPERATION
Cylinder Deactivation
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Trap an exhaust charge from a normal combustion event
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Normal combustion event
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Don't open the exhaust valve
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Don't open the intake valve
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Piston is an air spring
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Cylinders deactivated in firing sequence
Cylinder Reactivation
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Open the exhaust valve
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Empty the cylinder
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Open the intake valve
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Normal combustion event
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Cylinders reactivated in firing sequence
