DTC Confirmation Test (Using Generic Scan Tool)

WARNING: This page is about a different car, the 2002 Nissan Maxima and 2002 Infiniti I35. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Use the following test to check overall function of HO2S1 circuit. During this test, 1st trip DTC may not be confirmed.

CAUTION: DO NOT use ECM ground terminals when measuring voltage.

Start engine and warm to normal operating temperature. Measure voltage between ground and ECM terminal No. 91 (bank 1) or No. 92 (bank 2) by backprobing. See Figure and Figure .
While observing voltmeter, increase engine speed to 2000 RPM. Voltage should not remain in the .2-.4 volt range. If voltage is not as specified, go to DIAGNOSTIC PROCEDURE . If voltage is as specified, system is okay at this time.