Multiple Displacement System
| 1 - MDS Deactivating Lifter |
| 2 - Non-MDS Lifter |
| 3 - MDS Lifter Latching Pin Holes |
The Multiple Displacement System (MDS) selectively deactivates cylinders 1, 4, 6 and 7 during steady speed, low acceleration and shallow grade climbing conditions to increase fuel economy.
The MDS can provide a 5 to 20% fuel economy benefit when operating in four-cylinder mode, depending on driving habits and vehicle usage. For Environmental Protection Agency (EPA) rating purposes the fuel economy is 8 to 15% higher than if the engine was operating on eight-cylinders at all times.
The MDS deactivating lifter can be distinguished from the non-MDS lifter by the latching pin holes on the side of the MDS lifter.
MDS is integrated into the basic engine architecture requiring these additional components:
- Unique MDS camshaft
- Eight deactivating roller lifters
- Four MDS solenoids
- MDS solenoid wiring harness
- Oil temperature sensor