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LP Engine G430(3.0L) LP Fuel System (Low Emission Version)
Oxygen Sensor
The oxygen sensor installed on the exhaust
manifold makes use of the principles of a solid
electrolyte oxygen concentration cell. The oxygen
concentration cell is characterized by a sharp
change of the output voltage in the vicinity of the
stoichiometric air/fuel ratio.
Using such characteristics, the oxygen sensor
senses the oxygen concentration in the exhaust
gas and feeds it to the engine control unit. The
engine control unit then determines if the air/fuel
ratio is richer or leaner as compared to the
stoichiometric ratio and provides feedback control
to adjust the air/fuel ratio to the stoichiometric ratio
where the emission purification rate of the three-
catalyst convector is optimum.
Vacuum Switch (MAP)
1. Electrical
2. Vacuum port
3. Main body
The vacuum switch is a simple direct acting contact
pressure switch, consisting of a main body (3), an
electrical connector with two pins (1) and a vacuum
port connection (2).
The unit is normally open (i.e. the electrical connectors
(1) are not common) when no vacuum is applied to
the vacuum port (2).
When vacuum is applied to the port (2) unit
respponds and closes the electriccal contacts (1) so
that current may pass.
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