Maxima SE V6-3.0L (VQ30DE) (1998)
Before performing following procedure, confirm that battery voltage is more than 11 V at idle.
Never raise engine speed above 3,600 rpm (A/T), 4,000 rpm (M/T) during the "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE".
If the engine speed limit is exceeded, retry the procedure from step 2).
OVERALL FUNCTION CHECK
Use this procedure to check the overall tunction of the front heated oxygen sensor circuit. During this check, a 1st trip DTC might not be confirmed.
Without TOOLS
(1) Start engine and warm it up to normal operating temperature.
(2) Set voltmeter probes between ECM terminal (50) RH, (51) LH (sensor signal) and (25) (engine ground).
(3) Check the following with engine speed held at 2,000 rpm constant under no load.
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The maximum voltage is over 0.8 V at least one time.
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The minimum voltage is below 0.35 V at least one time.