Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Maxima. 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

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.

DTC	+			-	Voltage
	A/F sensor 1
	Bank	Connector	Terminal
P0031, P0032	1	F12	1	Ground	Battery voltage
P0051, P0052	2	F61	1

Is the inspection result normal?

YES

GO TO 3.

GO TO 2.

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

Turn ignition switch OFF.
Disconnect IPDM E/R harness connector.
Check the continuity between A/F sensor 1 harness connector and IPDM E/R harness connector.

DTC	A/F sensor 1			IPDM E/R		Continuity
DTC	Bank	Connector	Terminal	Connector	Terminal	Continuity
P0031, P0032	1	F12	1	F50	52	Existed
P0051, P0052	2	F61	1	F50	53	Existed

Is the inspection result normal?

YES

Perform the trouble diagnosis for power supply circuit.

Repair or replace error-detected parts.

CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT

Turn ignition switch OFF.
Disconnect ECM harness connector.

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

DTC	A/F sensor 1			ECM		Continuity
DTC	Bank	Connector	Terminal	Connector	Terminal	Continuity
P0031, P0032	1	F12	2	F13	6	Existed
P0051, P0052	2	F61	2	F13	46	Existed

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

Is the inspection result normal?

YES

GO TO 4.

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

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

Is the inspection result normal?

YES

INSPECTION END

NO

Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to Removal and Installation (bank 2) , Removal and Installation (bank 1) .