Prizm L4-108 1.8L DOHC VIN 8 MFI (1998)
Throttle Body: Description and Operation
The throttle body contains a throttle valve that controls the amount of air entering the engine. The throttle position (TP) sensor, manifold absolute
pressure (MAP) sensor, and idle air control (IAC) valve are all attached to the throttle body. The throttle body has an engine coolant passage that
provides warming of the throttle body housing and prevents icing.
The throttle body contains vacuum ports that are located above and below the throttle valve. These vacuum ports provide the vacuum signals used by
various components.
