1.CHECK GROUND CONNECTION

1. Turn ignition switch OFF.
2. Check ground connection M95. Refer to Ground Inspection in Circuit Inspection.

Is the inspection result normal?
YES>>GO TO 2.
NO>>Repair or replace ground connection.
2.CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT

1. Disconnect air fuel ratio (A/F) sensor 1 harness connector.
2. Turn ignition switch ON.
3. Check the voltage between A/F sensor 1 harness connector and ground.

   DTC | A/F sensor 1 | Ground | Voltage
   Bank | Connector | Terminal
   P0031, P0032 | 1 | F8 | 4 | Ground | Battery voltage
   P0051, P0052 | 2 | F25 | 4

Is the inspection result normal?
YES>>GO TO 4.
NO>>GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.

- Harness connectors E3, F1
- IPDM E/R harness connector E7
- 15A fuse (No. 46)
- Harness for open or short between A/F sensor 1 and fuse

>>Repair or replace harness or connectors.
4.CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.

   DTC | A/F sensor 1 | ECM | Continuity
   Bank | Connector | Terminal | Connector | Terminal
   P0031, P0032 | 1 | F8 | 3 | F101 | 4 | Existed
   P0051, P0052 | 2 | F25 | 3 | 3

4. Also check harness for short to ground and short to power.

Is the inspection result normal?
YES>>GO TO 5.
NO>>Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK A/F SENSOR 1 HEATER
Refer to Component Inspection (GT-R certified NISSAN dealer).
Is the inspection result normal?
YES>>GO TO 7.
NO>>GO TO 6.
6.REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1.
■ CAUTION ■

- Discard any A/F sensor which has been dropped from a height of more than 0.5 m (1.6 ft) onto a hard surface such as a concrete floor; use a new one.
- Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant (commercial service tool).

>>INSPECTION END
7.CHECK INTERMITTENT INCIDENT
Perform Intermittent Incident.
>>Repair or replace malfunctioning part.