2. Check Ho2S2 Ground Circuit For Open And Short

1. Disconnect heated oxygen sensor 2 harness connector.
   Fig 1: Identifying HO2S2 Harness Connector

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. Check harness continuity between HO2S2 terminal 4 and ground. Refer to WIRING DIAGRAM .

   Continuity should exist. 

3. Also check harness for short to power.

OK or NG 

1. OK: GO TO 4. CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT .
2. NG: GO TO 3.