Pajero II Workshop Manual 1991 · FUEL · страница 240 из 339 · Открыть оригинал PDF ↗
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Датчик кислорода
OPERATION
The oxygen sensor functions to detect the concen-
tration of oxygen in the exhaust gas; it converts
those datatovoltage, and inputs the resulting
signals to the engine control unit:
theair/fuelmixtureratioisricherthanthe
theoretical air/fuel mixture ratio (i.e , if the concen-
tration of oxygen in the exhaust gas is sparse) ,
voltage of approximately 1V is output; if the air/fuel
mixture ratio in leaner than the theoretical airlfuel
mixture ratio (i.e._if the concentration is dense) ,
voltage of approximately OV is output:
The engine control unit, based upon those signals
regulates the amount of fuel injection so that the
airifuel mixture ratio becomes the theoretical air/
fuel mixture ratio
TROUBLESHOOTING HINTS
Hint
The exhaust gas purification performance will worsen
if there is a malfunction of the oxygen sensor.
Hint 2:
If the oxygen sensor output voltage deviates from the
standard value even though the results of the checking
of the oxygen sensor are normal, the cause is probably
a malfunction of a component related to air/fuel mix-
ture ratio control.
[Examples]
Malfunction of an injector
(1)
(2)Air leakage into the intake manifold from a leaking
gasket.
(3) Malfunction of the air-flow sensor,the intake
airtemperaturesensorthebarometric-pres-
suresensor,ortheEnginecoolant tempera-
ture sensor
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