AT1–11 AT340E (2JZ–GE) AUTOMATIC TRANSMISSION – OPERATION 8 No.1 and No.2 Vehicle Speed Sensor Detects the vehicle speed. Ordinarily, transmission control uses signals from the No.2 vehicle speed sensor, and the No.1 vehicle speed sensor is used as a back–up. 9 Engine Coolant Temp. Sensor Detects the engine coolant temp. 10 ECM Controls the engine and transmission actuators based on signals from each sensor. 11 No.1 and No.2 Solenoid Valves Control the hydraulic pressure applied to each shift valve, and control the gear position and timing. 12 Lock–up Solenoid Valve (For lock–up control pressure modula-tion) Controls the hydraulic pressure applied to the lock–up clutch and controls lock–up timing. 13 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. 14 Kick–down Switch Detects if the accelerator pedal is depressed beyond the full throttle valve opening position. 15 A/T Fluid Temp. Sensor Detects the A/T fluid temp.