Pajero II Workshop Manual 1998 Supplement · FUEL · страница 75 из 104 · Открыть оригинал PDF ↗

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OXYGEN SENSOR <6G74-SOHC 24Valve Enginez

Engine control unit connector

OPERATION

The oxygen sensor functions to detect the
concentration of oxygen in the exhaust gas; it
converts those data to voltage, and inputs the
resulting signals to the engine control unit
If the airlfuel mixture ratio is richer than the
theoretical airlfuel mixture ratio (i.e.if the
concentration of oxygen in the exhaust gas is
sparse) , a voltage of approximately1 V is
output; if the air/fuel mixture ratio is leaner
than the theoretical airlfuel mixture ratio (i.e., if
the concentration is dense) ,voltage of
approximately 0 V 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 airlfuel mixture ratio

Battery power supply is applied, by way of the
controlrelay;to the oxygen sensor heater:As
result, the sensor element is heated by the
heater, s0 that the oxygen 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 isa malfunction of the
oxygen sensor:

Hint 2: Iftheoxygensensoroutput voltage
deviates from the standard value even
though the results of the checking of the
oxygen sensor are normal, the cause is
probablymalfunction ofcomponent
related t0 airlfuel mixture 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 sensor, or the
engine coolant temperature sensor:

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