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 ECM in the form of electrical signals.
2. ECM
The 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.
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
PARK/NEUTRAL POSITIOIN SWITCH
THROTTLE POSITIOIN SENSOR
VEHICLE SPEED SENSOR
STOP LIGHT SWITCH
O/D MAIN SWITCH
CRUISE CONTROL ECU
ENGINE COOLANT TEM-PERATURE SENSOR
A/T FLUID TEMPERATURE SENSOR
ECM
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 INDICA-TOR LIGHT
