Avalon & Highlander 3.0L V6

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Active control engine mount is used to reduce engine vibration and noise when engine is idling. Active control engine mount consists of vacuum tank, active control engine mount, Engine Control Module (ECM) and Active Control Mount (ACM) Vacuum Switching Valve (VSV). See Fig 1.

Operating range of active control engine mount is during idling when engine speed is less than 900 RPM. ACM VSV receives vacuum supply from the vacuum tank. Signals that are synchronized to engine speed are delivered from the ECM to the ACM VSV. Engine vacuum is used to vary the pressure in active control engine mount. As a result, the diaphragm in active control engine mount vibrates and uses the liquid in the main liquid chamber to control engine mount vibration. The force of the vibration in the active control engine mount is regulated by the orifice and the side branch which vents out to the atmosphere. Vibration of active control engine mount acts to cancel out the engine vibration during idle to reduce engine vibration and noise.

Fig 1: Identifying Typical Active Control Engine Mount Components (Avalon & Highlander 3.0L V6)