ES300 — NEW FEATURES 17 8. Engine Mount General Similar to the ’98 model, a 3-point support on the front subframe has been adopted. However, an ac- tive control engine mount has been adopted for the front engine mount and a liquid-filled compound mount has been adopted for the rear engine mount to reduce noise and vibration and to achieve high levels of both riding comfort and drivability.
Torque Rod Liquid-Filled Compound Mount VSV Active Control Engine Mount Absorber Left Mount 161ES59 Active Control Engine Mount Signals that are synchronized to the engine rpm (number of combustions) are sent by the ECM to the VSV and the engine vacuum is utilize to vary the pressure of the air chamber in the active control engine mount. As a result, the diaphragm vibrates, and using the liquid as a medium, the rubber mount vibrates. This vibration of the engine mount acts to cancel out the engine vibration during idle, thus reducing the vibration and noise at idle. The engine mount’s force to generate vibrations is adjusted through the effects of the orifice and the side branch.
The operating range of the active control engine mount is from the engine speeds of 500 rpm to 900 rpm. Intake Air Chamber Rubber Main Liquid Chamber Vacuum Tank Engine Orifice Diaphragm ECM VSV To VSV Air Chamber Active Control Engine Mount Side Branch Rubber 161ES46 161ES47