DTC Diagnosis Procedure

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT

Disconnect air fuel ratio (A/F) sensor 1 harness connector.
Turn ignition switch ON.

Check the voltage between A/F sensor 1 harness connector and ground.

+			-	Voltage
A/F sensor 1
Bank	Connector	Terminal
2	F5	1	Ground	Battery voltage

Is the inspection result normal?

YES

GO TO 2.

Repair or replace error-detected parts.

CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT

Turn ignition switch OFF.
Disconnect ECM harness connector.

Check the continuity between A/F sensor 1 harness connector and ECM harness connector.

+			-		Continuity
A/F sensor 1			ECM
Bank	Connector	Terminal	Connector	Terminal
2	F5	2	F54	46	Existed

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

Is the inspection result normal?

YES

GO TO 3.

Repair open circuit, short to ground or short to power in harness or connectors.

CHECK A/F SENSOR 1 HEATER
Refer to Component Inspection .

Is the inspection result normal?

YES

Check intermittent incident. Refer to Intermittent Incident .

NO

GO TO 4.
REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to Exploded View .
CAUTION:
- Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) 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