MANUALS · FUEL [13] · страница 161 из 340 · Открыть оригинал PDF ↗
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Датчик кислорода
OPERATION
The oxygen sensor functions to detect the con-
centrationofintheexhaust
oxygengas;
converts those data to voltage,and inputs the
resulting signals to the engine control unit;
If the air /fuelmixture ratio is richerthanthe
theoretical air /fuel mixture ratio (i.e-, if the con
centrationofintheexhaustis
oxygengas
sparse) , a voltage of approximately 1V is output;
if the air /fuel mixture ratio isleaner than the
theoretical air /fuel mixture ratio (i.e-if the con-
centration 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
air / fuelmixture ratiobecomesthe theoretical
air / fuel mixture ratio.
Battery power supply is applied, by way of the
controlrelay;to the oxygen sensor heater.As a
result;thesensorelementheatedbythe
heater, so that the oxvgen sensor shows excellent
response even if the temperature of the exhaust
gas is low:
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
fromthestandardvalueeventhoughthe
results of the checking of the oxygen sensor
are normal, the cause is probably a malfunc-
tion of a component related to air/fuel mix-
ture ratio control.
[Examples]
(1) Malfunction of an injector.
(2) Air leakage into the intake manifold from
leaking gasket:
(3) Malfunctionof the air-flow sensor,the
intake air temperature sensorthe baro-
metric-pressuresensorortheengine
coolant temperature sensor:
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