3000GT SL V6-2972cc 3.0L DOHC MFI (1997)
TROUBLESHOOTING HINTS
Hint 1: Poor cleaning of exhaust gas will result if the heated oxygen sensor fails.
Hint 2: If the heated oxygen sensor checked good but the sensor output voltage is out of specification, troubles of parts related to air-fuel ratio
control system are suspected.
Examples
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Faulty injector
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Air leaking into the intake manifold through gasket gap, etc.
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Faulty volume air flow sensor, intake air temperature sensor, barometric pressure sensor, engine coolant temperature sensor
INSPECTION USING SCAN TOOL
Heated oxygen sensor (front)
Heated oxygen sensor (rear)
Heated oxygen sensor (front, rear)
HARNESS INSPECTION
STEP 1: Measure the power supply voltage of the heated oxygen sensor.
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Connector: Disconnected
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Ignition switch ON
Voltage: Battery positive voltage
OK: GO TO STEP 2
NG: Repair the harness. (A1, B1, C1, D1-MFI relay)