How does automatic transmission work on a Ford Focus II?
The automatic transmission (automatic transmission) on the Ford Focus II is a 4-speed or 5-speed gearbox with a torque converter. It changes gears automatically using signals from sensors located on the engine, transmission and wheels.
Gear shift process
Gear changes occur in response to the following factors:
* Engine Speed: When the engine speed reaches a preset level, the throttle position sensor notifies the transmission control module (TCM).
* Engine Load: The Mass Air Flow (MAF) sensor or oxygen sensor detects the load on the engine. High load indicates the need to downshift.
*Vehicle speed: The wheel speed sensor provides the TCM with vehicle speed information.
* Gear Selector Position: The gear selector tells the TCM the desired driving mode (P, R, N, D, S, L).
Switching sequence
When accelerating, the vehicle shifts to higher gears that match the speed and load. Gear shifting is carried out in the following sequence:
1. 1st gear: Used to start the vehicle from a standstill or when driving at very low speeds.
2. 2nd gear: Shifts to a higher gear when the vehicle reaches a certain speed and engine speed.
3. 3rd gear: Used when driving at medium speeds, providing a balance between power and fuel economy.
4. 4th gear (4-speed automatic transmission) or 5th gear (5-speed automatic transmission): The optimal gear for driving at higher speeds, providing maximum fuel economy.
Mode «S» (Sport)
«S» mode is available on select Focus II models and optimizes gear shifting for a sportier ride. In this mode, gears are changed at higher engine speeds, giving the car faster acceleration.
«L» (Low) mode
L mode limits downshifts, providing maximum engine braking. This is useful when going downhill or towing trailers.