FUEL SYSTEM
On-vehicle Inspection of MPI Components
OXYGEN SENSOR <Non Turbo>
Theoretical
14
15
16
C o n t r o l r e l a y
Engine control unit
Equipment side
connector
Engine control unit connector
OPERATION
l
The oxygen sensor senses the oxygen concentration in exhaustgas, converts it into a voltage and inputs it
to the engine control unit.
l
The oxygen sensor outputs about 1 V when the air fuel ratio is richer than the theoretical ratio and outputs
about 0 V when the ratio is leaner (higher oxygen concentration in exhaust gas).
l
The engine control unit controls the fuel injection ratio based on this signal so that the air fuel ratio may be
kept at the theoretical ratio.
l
The battery voltage is supplied to the oxygen sensor through the control relay. Therefore, the sensor
element is heated by the heater so that the oxygen sensor remains responsive even when the exhaust
temperature is low.
i
TSB
Summary of Contents for 3000GT 1991
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Page 942: ...EXTERIOR SDecial Tools SPECIAL TOOLS MBlKG I system inspectlon MB991 359 TSB Revision...
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