6. Check Ho2S1 Ground 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.

Turn ignition switch OFF.
Disconnect heated oxygen sensor 1 harness connector.

Fig 1: Identifying HO2S1 Harness Connector
Courtesy of NISSAN MOTOR CO., U.S.A.
Check harness continuity between HO2S1 terminal 4 and ground.
Continuity should exist.

Refer to WIRING DIAGRAM .
Also check harness for short to power.

OK or NG

OK: GO TO 7.
NG: Repair open circuit or short to power in harness or connectors.