Diagnostic Procedure

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

CHECK HO2S2 HEATER POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor 2 harness connector.
  
  Fig 1: Checking HO2S2 Heater Power Supply Circuit
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Turn ignition switch ON.
4. Check voltage between HO2S2 terminal 3 and ground with CONSULT-II or tester.
  1. Voltage: Battery voltage
OK or NG
1. OK: GO TO 3 .
2. NG: GO TO 2.
  
  Fig 2: Checking Voltage Between Terminal And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E5, F14
- IPDM E/R connector E122
- 15A fuse
- Harness for open or short between heated oxygen sensor 2 and fuse
  1. Repair harness or connectors.
CHECK HO2S2 HEATER OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal and HO2S2 terminal as follows.
  Refer to WIRING DIAGRAM .
  
  Fig 3: Harness Continuity Between ECM Terminal And HO2S2 Terminal
  Courtesy of NISSAN MOTOR CO., U.S.A.
  1. Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 4.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK HEATED OXYGEN SENSOR 2 HEATER
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: GO TO 5.
2. NG: Replace malfunctioning heated oxygen sensor 2.
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
1. INSPECTION END