When you activate the ignition in your Toyota Sienna the Starter Solenoid acts as a circuit finisher that connects the battery to the starter motor and as well helps the starter pinion to connect with engine ring gear. The electromagnet functions as a contactor which creates a connection between a small ignition switch electric current and a larger current from the battery to power the starter motor to start the engine. Several Toyota Starter Solenoid designs have been employed throughout history starting with the bendix drive system from previous years that utilized inertia-based engagement instead of solenoid operation. The updated solenoid design features an integrated one-way clutch device which obstructs unnecessary power transfer to the starter motor. A weak Sienna Starter Solenoid function occurs when electropower is insufficient because of battery failure or corroded wires which prevents the starter motor from engaging. The Toyota Sienna Starter Solenoid requires regular maintenance for achieving its optimal performance level.
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