Honda Fit: Fuel and Emissions System Description - Electronic Throttle Control System

Electronic Throttle Control System

The throttle is electronically controlled by the electronic throttle control system (ETCS). Refer to the system diagram to see a functional layout of the system.

Idle control: When the engine is idling, the ECM/PCM controls the throttle actuator to maintain the proper idle speed according to engine loads.

Acceleration control: When the accelerator pedal is pressed, the ECM/PCM opens the throttle valve depending on the accelerator pedal position (APP) sensor signal.

Cruise control: The ECM/PCM controls the throttle actuator to maintain the set speed when cruise control is operating. The throttle actuator takes the place of the cruise control actuator.

Accelerator Pedal Position (APP) Sensor

As the accelerator pedal position changes, the sensor varies the signal voltage to the ECM/PCM which then controls the throttle position.

Throttle Body

The throttle body is a single-barrel side draft type. To prevent icing of the throttle plate, the lower portion of the throttle valve is heated by engine coolant from the cylinder head.

Electronic Throttle Control System   Diagram

The electronic throttle control system consists of the throttle actuator, TP sensor A/B, the APP sensor A/B, the ETCS control relay, and the ECM/PCM.

See also:

Additional Information About Your Seat Belts
Seat Belt System Components Your seat belt system includes lap/ shoulder belts in all five seating positions. The front seat belts are also equipped with automatic seat belt tensioners. This syste ...

Engine Coolant
Specified coolant: Honda Long Life Antifreeze/Coolant Type 2 This coolant is premixed with 50% antifreeze and 50% water. Do not add any straight antifreeze or water. We recommend you check the en ...

HFL Menus
The ignition switch must be in ACCESSORY or ON to use HFL. To use HFL, you must first pair your Bluetooth-compatible cell phone to the system while the vehicle is parked. Phone Setup &# ...