Toyota Camry Manual page 80

AX1–7
AUTOMATIC TRANSAXLE – OPERATION
2. Hydraulic Control System
The hydraulic control system is composed of the oil pump, the valve body, the solenoid valves,
the accumulator, 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 clutch, clutches and brakes in accordance
with the vehicle driving conditions.
There are three solenoid valves on the valve body.
The shift solenoid valves No. 1 and No.2 are turned on and off by signals from the ECM to operate
the shift valves and change the gear shift position.
The No.3 solenoid valve is operated by signals from the ECM to engage or disengage the lock–
up clutch of the torque converter clutch.