Montero LS 4WD V6-2972cc 3.0L SOHC 24 Valve (1996)
theoretical air/fuel mixture ratio.
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Battery positive voltage is supplied, by way of the MFI relay, to the heated oxygen sensor heater. As a result, the sensor element is heated by
the heater, so that the heated 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 is a malfunction of the heated oxygen sensor.
Hint 2:
If the heated oxygen sensor output voltage is outside the standard value even though the results of the checking of the heated oxygen sensor are
normal, the cause is probably a malfunction of a component related to mixture control.
[Examples]
1. Malfunction of injector
2. Air is drawn into the intake manifold from a leaking gasket, etc.
3. Malfunction of volume air flow sensor, intake air temperature sensor, barometric pressure sensor or engine coolant temperature sensor.
INSPECTION
Using Scan Tool
<Heated Oxygen Sensor (front)>
<Heated Oxygen Sensor (rear)>
HARNESS INSPECTION
STEP 1. Check for continuity between the heated oxygen sensor and the MFI relay.
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MFI relay connector: Disconnected
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Heated oxygen sensor connector: Disconnected
NOTE:
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Touch the ohmmeter probes to both ends of the harness.