Mitsubishi 3000GT Service Manual page 241

HEATED OXYGEN SENSOR <Non Turbo>
Heated oxygen
Electromotive
Theoretical A/F
force (V)
14
15
OPERATION
The heated oxygen sensor senses the oxygen concentration in exhaust gas, converts it into a voltage
l
and inputs it to the engine control module.
The heated oxygen sensor outputs about 1 V when the air-fuel ratio is richer than the theoretical
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ratio and outputs about 0 V when the ratio is leaner (higher oxygen concentration in exhaust gas).
The engine control module controls the fuel injection ratio based on this signal so that the air-fuel
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ratio may be kept at the theoretical ratio.
The battery voltage is supplied to the heated oxygen sensor through the MFI relay. Therefore, the
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sensor element is heated by the heater so that the heated oxygen' sensor remains responsive even
when the exhaust temperature is low.
On-Vehicle Inspection of MFI
MULTIPORT
FUEL INJECTION - Comoonents
Engine control module r\5&72
16
Engine control module connector
Heated oxygen
sensor
L J
A Equipment side
connector