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:

EPS Motor Removal and Installation
NOTE: Do not allow dust, dirt, or other foreign materials to enter the steering gearbox. Removal Remove the steering gearbox. Remove the EPS motor 3P connector (A) and the EPS ...

Tools
Types of Tools The tools were stored in the cargo area. ...

Troubleshooting
Why does the vehicle position icon on the map “lag” a short distance behind my actual position, especially at intersections? This is normal. The navigation system is unaware of the width o ...