engineering document

May 15th, 2015
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TOYOTA STARTING SYSTEMSGeneralStarting the engine is possibly the most importantfunction of the vehicle's electrical system. Thestarting system performs this function by changingelectrical energy from the battery to mechanicalenergy in the starting motor. This motor thentransfers the mechanical energy, through gears, tothe flywheel on the engine's crankshaft. Duringcranking, the flywheel rotates and the air-fuelmixture is drawn into the cylinders, compressed,and ignited to start the engine. Most enginesrequire a cranking speed of about 200 rpm.Toyota Starting SystemsTwo different starting systems are used on Toyotavehicles. Both systems have two separateelectrical circuits ... a control circuit and a motorcircuit. One has a conventional starting motor.This system is used on most older-model Toyotas.The other has a gear reduction starting motor.This system is used on most current Toyotas. Aheavy-duty magnetic switch, or solenoid, turnsthe motor on and off. It is part of both the motorcircuit and the control circuit.Both systems are controlled by the ignitionswitch and protected by a fusible link. On somemodels, a starter relay is used in the starter controlcircuit. On models with automatic transmission, aneutral start switch prevents starting with thetransmission in gear. On models with manualtransmission, a clutch switch prevents startingunless the clutch is fully depressed. On 4WD Truckand 4-Runner models, a safety cancel switchallows start

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