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:

Previous Destinations
INFO button ► Setup ►Personal Information►Previous Destinations The navigation system maintains a list of your previously routed destinations as a shortcut for entering the s ...

Driving Preparation
Check the following items before you start driving. Exterior Checks • Make sure there are no obstructions on the windows, door mirrors, exterior lights, or other parts of the vehicle. ► Re ...

Parking Brake Inspection and Adjustment
Inspection Pull the parking brake lever (A) with 196 N (20 kgf, 44.1 lbf)   of force to fully apply the parking brake. The parking brake lever should be locked within the specif ...