Throttle Body Assembly
The throttle body assembly is located underneath the engine surge tank cover (1), between the air inlet duct (2) and the intake collector. The following components and parts make up the throttle body assembly:
- Throttle valve
- Idle air bypass passage
- Fast idle-up valve
- Mass air flow sensor
- Throttle position sensor
- Engine coolant passage
The throttle valve is interlocked with the accelerator pedal by the accelerator control cable. The throttle valve controls the large volume of air that is drawn into the intake chamber. The idle air bypass passage provides air for the control of engine speed when the throttle valve is closed. The fast idle-up valve provides additional bypass air to engine when the engine is cold. The fast idle-up valve is preset at the factory and cannot be adjusted. The fast idle-up valve is not serviced separate from the throttle body assembly. The throttle body is warmed by engine coolant that flows through a coolant passage located near the fast idle-up valve. The warming of the throttle body also helps prevent throttle valve icing. The throttle body also houses the components of the MAF sensor.