MANUALS · FUEL [13] · страница 240 из 340 · 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 data tovoltage, and inputs the resulting
signals to the engine control unit.

the airlfuelmixtureratioisricher thanthe
theoretical air/fuel mixture ratio (i.e., if the concen-
tration of oxygen in the exhaust gas is sparse) , a
voltage of approximately 1V is output; if the airlfuel
mixture ratio in leaner than the theoretical airlfuel
mixture ratio (i.e_, if the concentration is dense), a
voltage of approximately OV is output:

The engine control unit, based upon those signals
regulates the amount of fuel injection so that the
airlfuel mixture ratio becomes the theoretical airl
fuel mixture ratio.

TROUBLESHOOTING HINTS

Hint 1:

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 airlfuel mix-
ture ratio control:

[Examples]

(1) Malfunction of an injector.

(2)Air leakage into the intake manifold from a leaking
gasket:

(3) Malfunction of the air-flow sensor, the intake
air temperaturesensorthe barometric-pres-
suresensor,or the Enginecoolant tempera-
ture sensor

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