![]() The ECU communicates with the transmission control module (TCM), a computer that monitors the engine's RPMs and transmission. The ECU receives input from sensors that monitor the car's speed, engine RPM, and accelerator and brake pedal activity. The ECU is a computer that controls the engine and transmission. Most modern cars have a transmission controlled by an electronic control unit (ECU). ![]() The TCM can also engage the transmission's overdrive gear when the car is cruising at a steady speed. When the car slows down, the TCM signals the transmission to downshift into a lower gear. ![]() When the car is shifted into drive, the TCM sends a signal to the appropriate solenoid, which engages the clutch or band and starts the car in first gear.Īs the car accelerates, the TCM sends signals to the other solenoids, which engage the other gears. The transmission control module controls these solenoids (TCM), a computer that monitors the car's speed and the shifter's position. The transmission is controlled by a series of solenoids that direct the flow of hydraulic fluid. The governor is connected to the accelerator pedal and prevents the engine from revving too high. The transmission also has a governor that controls the speed of the engine. The torque converter is a fluid coupling that uses hydraulic pressure to multiply the engine's torque. Most automatic transmissions have a torque converter responsible for transferring the engine's power to the transmission. This gear helps improve fuel economy by reducing the engine's RPMs. The fourth and fifth gears are typically overdrive gears that engage at higher speeds. The transmission then shifts to second gear and then third gear as the car's speed increases. This gear is engaged when the car starts from a stop. The first gear in an automatic transmission is typically low. Over time, the fluid can become dirty and need to be replaced. The fluid also contains a detergent that keeps the moving parts clean. The transmission is filled with a special fluid that keeps it cool and lubricated. This means drivers can focus on other things while driving and only have to worry about shifting gears when going up or down a hill. An auto transmission uses a series of hydraulically controlled clutches and bands to engage and disengage gears without any input from the driver. A car's transmission is responsible for transferring the engine's power to the drivetrain and differentiating between speeds.
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