Maxima SE V6-3.0L (VQ30DE) (1998)
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DIAGNOSTIC PROCEDURE
COMPONENT INSPECTION
Rear heated oxygen sensor
Without TOOLS
(1) Start engine and warm it up to normal operating temperature.
(2) Set voltmeter probes between ECM terminals (56) (sensor signal) and (25) (ECM ground).
(3) Check the voltage when racing up to 4,000 rpm under no load at least 10 times.
(Depress and release accelerator pedal as soon as possible.)
The voltage should be above 0.48V at least once. If the voltage is above 0.48V at step 3, step 4 is not necessary.
(4) Keep vehicle at idling for 10 minutes, then check the voltage. Or check the voltage when coasting from 80 km/h (50 MPH) in 3rd gear position.