Construction and Operation

MECHANICAL OPERATION




OPERATING CONDITION







FUNCTION OF COMPONENTS




HYDRAULIC CONTROL SYSTEM
The hydraulic control system is composed of the oil pump, the valve body, the solenoid valves, the accumulators, the clutches and brakes, and the governor valve as well as the fluid passages which connect all of these components.

Based on the hydraulic pressure created by the oil pump, the hydraulic control system governs the hydraulic pressure acting on the torque converter, clutches and brakes in accordance with the vehicle driving conditions.

The governor valve produces hydraulic pressure in response to vehicle speed. Governor pressure increases as vehicle speed increases. (A241L and A243L)

There are three solenoid valves on the valve body of the A241E automatic transaxle.

The No.1 and No.2 solenoid valves are turned on and off by signals from the ECU to operate the shift valves and change the gear shift position.

The No.3 solenoid valve is operated by signals from the ECU to engage or disengage the lock-up clutch of the torque converter.

The valve body of the A241L and A243L automatic transaxle has one solenoid valve, which is for overdrive control.

A241E ELECTRONIC CONTROL SYSTEM

GENERAL
The electronic control system for the A241E automatic transmission provides extremely precise control of the gear shift timing and lock-up timing in response to driving conditions as sensed by various sensors located throughout the vehicle and in response to the engine's running condition.

At the same time, the ECU control reduces vehicle squat when the vehicle starts out and gear shift shock. The electronic control system is also equipped with a self diagnosis system which diagnoses malfunctions of electronically controlled components and warns the driver, and a fail-safe system which makes it possible for the vehicle to continue functioning when a malfunction occurs.




CONSTRUCTION
The electronic control system can be broadly divided into three groups; the sensors, ECU and actuators.

ELECTRONIC CONTROL CIRCUIT Inspection of Electronic Control Components

ELECTRONIC CONTROL COMPONENTS Inspection of Electronic Control Components

A241L and A243L Electronic Control System Electronic Control System (A241L , A243L)