4. Check HO2S2 Input Signal Circuit For Open And Short

WARNING: This page is about a different car, the 2004 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

Check harness continuity between ECM terminal and HO2S2 terminal as follows.
Refer to WIRING DIAGRAM.

Fig 1: Test Parameters
Courtesy of NISSAN MOTOR CO., U.S.A.
1. Continuity should exist.
Check harness continuity between the following terminals and ground.
Refer to WIRING DIAGRAM.

Fig 2: Test Parameters
Courtesy of NISSAN MOTOR CO., U.S.A.
1. Continuity should exist.
Also check harness for short to power.

OK or NG

OK: GO TO 5.
NG: Repair open circuit or short to ground or short to power in harness or connectors.