DESCRIPTION
The Evaporative Emission Control System prevents fuel vapor stored in fuel tank from vaporizing into the atmosphere. When the fuel evaporates in the fuel tank, the vapor passes through vent hoses or tubes to a canister filled with charcoal.
The canister temporarily holds the vapor in the charcoal. The ECM will control the system in order to draw the gathered vapor into the combustion chambers during certain operating conditions. Engine manifold vacuum is used to draw the vapor into intake manifold.
Scheme 153
The catalytic converter of the gasoline engine is a three way catalyst. It oxidizes carbon monoxide and hydrocarbons (HC), and separates oxygen from the oxides of nitrogen (NOx).
There are two types of three-way catalyst; Palette type and Monolith type.
[SULEV]
Scheme 154
[ULEV]
Scheme 155
A ratchet tightening device on the threaded fuel filler cap reduces the chances of incorrect installation, which seals the fuel filler. After the gasket on the fuel filler cap and the filler neck flange contact each other, the ratchet produces a loud clicking noise indicating the seal has been set.
Scheme 156
Scheme 157
Scheme 158
- Turn the ignition switch OFF and disconnect the battery negative (-) cable.
- Disconnect the canister close valve connector (A).
- Disconnect the ventilation tube quick connector (B).
- Release the lever (C), and then remove the fuel tank air filter (D) after rotating it in the direction of the arrow in the figure.