{"model":"mk4","model_name":"MK4 Supra","vehicle":"Toyota Supra A80 (1993–2002, 2JZ-GE / 2JZ-GTE)","document":"Repair Manual","section":"ATGE","section_name":"A340 Automatic Trans (GE)","page":7,"pages_in_section":98,"title":"Electronic Control System","section_header":"AT340E (2JZ-GE) Automatic Transmission — Operation","ocr_text":"ELECTRONIC CONTROL SYSTEM\n\nThe electronic control system, which controls the shift points and the operation of the lock–up clutch, is composed of the following three parts:\n1. Sensors\nThese sensors sense the vehicle speed, throttle opening and other conditions and send this data to the ECM in the form of electrical signals.\n2. ECM\nThe ECM determines the shift and lock–up timing based upon the signals from sensors, and controls the solenoid valves of the hydraulic control unit accordingly.\n3. Actuators\nThese are three solenoid valves that control hydraulic pressure acting on the hydraulic valves to control shifting and lock–up timing.\n\nSENSORS\n\nDRIVING PATTERN SELECTOR\n\nPARK/NEUTRAL POSITIOIN SWITCH\n\nTHROTTLE POSITIOIN SENSOR\n\nVEHICLE SPEED SENSOR\n\nSTOP LIGHT SWITCH\n\nO/D MAIN SWITCH\n\nCRUISE CONTROL ECU\n\nENGINE COOLANT TEM-PERATURE SENSOR\n\nA/T FLUID TEMPERATURE SENSOR\n\nECM\n\nControl of shift timing\n\nControl of lock–up timing\n\nSelf–diagnostic system\n\nBack–up system\n\nACTUATORS\n\nNO. 1 SOLENOID VALVE\n\nNO. 2 SOLENOID VALVE\n\nLOCK–UP SOLENOID VALVE\n\nO/D OFF INDICA-TOR 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