TAILIEUCHUNG - Automatic Transmissions P12

Shift lock system | Section 12 SHIFT LOCK SYSTEM Lesson Objectives 1 Describe the control of the key lock mechanism for the mechanical shift lock system. 2. Describe the control of the shift lock mechanism for the mechanical shift lock systems. 3. Describe the effect of the brake pedal input on the shift lock mechanism for electrical and electrical mechanical systems. 4. Describe the effect of the gear shift selector position on the key lock mechanism for electrical systems. 5. Given a voltmeter and repair manual demonstrate the pin checks of the shift position switch. 182 TOYOTA Technical Training SHIFT LOCK SYSTEM The shift lock system is designed to ensure the proper operation of the automatic transmission. The driver must depress the brake pedal in order to move the gear selector from Park to any other range. In addition the ignition key cannot be turned to the Lock position and removed from the ignition switch unless the gear selector is placed in the Park position. There are three systems available in Toyota models electrical electrical mechanical and mechanical. We will not cover the application by model but rather by system type. For the specifics on a particular model consult the repair manual. Automatic Transmissions - Course 262 183 Section 12 Electrical Shift Lock Type as well as the key lock mechanism. Shift Lock Mechanism The electrical type uses electrical control of the shift lock mechanism The shift lock mechanism is made up of a number of components as seen in the illustration below. Shift Lock Mechanism Shift Lock Override Button Shift Lock Solenoid The shift position switch shift lock control switch is used to detect the position of the shift lever. It has two contacts PI and P2. When the select lever is in the Park position PI is on closed and P2 is off open . In this position the key can be removed but the select lever is locked in position. When the select lever is in a position other than Park PI is off open and P2 is on closed . In this position the key cannot

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