5. Check Ho2S2 Input Signal Circuit For Open And Short

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

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

Fig 1: Checking Harness Continuity Between ECM Terminal & HO2S2 Terminal
Courtesy of NISSAN MOTOR CO., U.S.A.

Continuity should exist.
Check harness continuity between the following terminals and ground. Refer to WIRING DIAGRAM .

Fig 2: Checking Harness Continuity Between Terminals & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

Continuity should not exist.
Also check harness for short to ground or short to power.

OK or NG

OK: GO TO 7. CHECK HEATED OXYGEN SENSOR 2 .
NG: GO TO 6.