Description & Operation
Automatic transmission provides 3 forward speeds and reverse. Main internal components are; oil pump, Torque Converter w/Clutch (TCC), reverse clutch, 2nd clutch, 3rd clutch, one-way clutch (sprag type), compound planetary gear set, low brake, governor and valve body. See Fig 1.
Gear shifting is controlled by valve body. Components that regulate shifting schedules are; governor, modulator and kick-down valve. TCC is operated by an electric solenoid. TCC solenoid operation depends on signals provided by the Engine Coolant Temperature (ECT) sensor, brake switch, Throttle Position (TP) sensor, Vehicle Speed Sensor (VSS) and gear position.