Page text (OCR transcript)
ELECTRONIC CONTROL SYSTEM
The electronic control system, which controls the shift points and the operation of the lock-up clutch, is composed of the following three parts:
1. Sensors
These sensors sense the vehicle speed, throttle opening and other conditions and send this data to the ECU in the form of electrical signals.
2. ECU
The ECU determines the shift and lock-up timing based upon the signals from sensors, and controls the solenoid valves of the hydraulic control unit accordingly.
3. Actuators
These are three solenoid valves that control hydraulic pressure acting on the hydraulic valves to control shifting and lock up timing.
SENSORS
DRIVING PATTERN SELECTOR
NEUTRAL START SWITCH
THROTTLE POSITION SENSOR
VEHICLE SPEED SENSOR
BRAKE LIGHT SWITCH
O/D MAIN SWITCH
CRUISE CONTROL COMPUTER
WATER TEMPERATURE SENSOR
ECU
Engine ECU
Control of shift timing
Control of lock-up timing
Self-diagnostic system
Back-up system
ACTUATORS
NO. 1 SOLENOID VALVE
NO. 2 SOLENOID VALVE
LOCK-UP SOLENOID VALVE
O/D OFF INDICATOR LIGHT
