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.CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE

1. Clear the mixture ratio self-learning value. Refer to Special Repair Requirement (GT-R certified NISSAN dealer).
2. Run engine for at least 10 minutes at idle speed.

Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected? Is it difficult to start engine?
YES>>Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to DTC Logic (GT-R certified NISSAN dealer) or DTC Logic (GT-R certified NISSAN dealer).
NO>>GO TO 3.
3.CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor 2 (HO2S2)harness connector.
3. Disconnect ECM harness connector.
4. Check the continuity between HO2S2 harness connector and ECM harness connector.

   DTC | HO2S2 | ECM | Continuity
   Bank | Connector | Terminal | Connector | Terminal
   P0139 | 1 | F53 | 1 | F102 | 70 | Existed
   P0159 | 2 | F52 | 1

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

Is the inspection result normal?
YES>>GO TO 4.
NO>>Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Check the continuity between HO2S2 harness connector and ECM harness connector.

   DTC | HO2S2 | ECM | Continuity
   Bank | Connector | Terminal | Connector | Terminal
   P0139 | 1 | F53 | 4 | F102 | 73 | Existed
   P0159 | 2 | F52 | 4 | 77

2. Check the continuity between HO2S2 harness connector or ECM harness connector and ground.

   DTC | HO2S2 | ECM | Ground | Continuity
   Bank | Connector | Terminal | Connector | Terminal
   P0139 | 1 | F53 | 4 | F102 | 73 | Ground | Not existed
   P0159 | 2 | F52 | 4 | 77

3. Also check harness for 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 HEATED OXYGEN SENSOR 2
Refer to Component Inspection (GT-R certified NISSAN dealer).
Is the inspection result normal?
YES>>GO TO 7.
NO>>GO TO 6.
6.REPLACE HEATED OXYGEN SENSOR 2
Replace malfunctioning heated oxygen sensor 2.
■ CAUTION ■

- Discard any heated oxygen 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 oxygen 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
Refer to Intermittent Incident.
>>INSPECTION END