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:

How to Set Readiness Codes
Malfunction Indicator Lamp (MIL) Indication (In relation to Readiness Codes) The vehicle has certain readiness codes that are part of the on-board diagnostics for the emissions systems. If the ve ...

Adjusting the Seats
WARNING Sitting too close to a front airbag can result in serious injury or death if the front airbags inflate. Always sit as far back from the front airbags as possible while maintaining cont ...

Resetting the Clock Settings
INFO button ► Setup ►Other ►Clock Adjustment►Clock Adjustment Reset all clock settings to the factory defaults. Select OK under Reset. ...