MANUALS · FUEL [13] · страница 60 из 340 · Открыть оригинал PDF ↗

Текст распознан со скана. Числа и обозначения можно сверить с оригиналом ниже.

Датчик кислорода

OPERATION

The oxygen sensor functions to detect the concen-
tration of oxygen in the exhaust gas; it converts
those data to voltage, and inputs the resulting
signals to the engine control unit.

the airlfuelmixtureratio isricherthanthe
theoretical airlfuel mixture ratio (i.e , if the concen-
tration of oxygen in the exhaust gas is sparsel.
voltage of approximately IV is output; if the air/fuel
mixture ratio in leaner than the theoretical air/fuel
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
airlfuel mixture ratio becomes the theoretical air-
Ifuel mixture ratio.

Battery power supply is applied, by way of the
control relay, to the oxygen sensor heater.As a
result; the sensor element is heated by the heater,
re-
so that the oxygen sensor shows excellent
sponse even if the temperature of the exhaust gas
is low

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
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
temperature sensor, the barometric-pressure sen-
sor, or the engine coolant temperature sensor.

Оригинальная страница руководства