AT2–11 A340E (2JZ—GTE) AUTOMATIC TRANSMISSION – OPERATION O/D Direct Clutch Speed Sensor | Detects the input shaft speed from 1st gear to 3rd gear Engine Coolant Temp. Sensor | Detects the engine coolant temp. ECM | Controls the engine and transmission actuators based on signals from each sensor. No.1 and No.2 Solenoid Valves | Control the hydraulic pressure applied to each shift valve, and control the gear position and timing. No.4 Solenoid Valve (For accumulator back pressure modulation) | Controls the hydraulic pressure applied to the back chamber of the accumulator and smoothes the engagement of clutches and brakes during shifting. No.3 Solenoid Valve (For lock–up control pressure modulation) | Controls the hydraulic pressure applied to the lock–up clutch and controls lock–up timing. No.5 Solenoid Valve (For line pressure modulation) | Controls the line pressure. O/D OFF Indicator Light | Blinks and warns the driver, while the O/D main switch is pushed in, when the electronic control circuit is malfunctioning. A/T Fluid Temp. Sensor | Detects A/T fluid temp.