Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Avalon & Highlander 3.0L V6
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.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.