4. Check HO2S2 Input Signal Circuit For Open And Short

1. 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. 
2. 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. 
3. Also check harness for short to power.

OK or NG 

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