Diagnosis Procedure

WARNING: This page is about a different car, the 2011 Infiniti FX50. However, it is still accessible from the selected car via links, so may be relevant.

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.

CHECK AIR FUEL RATIO 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 REFERENCE CHART

DTC	A/F sensor			Ground	Voltage
DTC	Bank	Connector	Terminal	Ground	Voltage
P0132	1	F67	4	Ground	Battery voltage
P0152	2	F68	4	Ground	Battery voltage

Is the inspection result normal?

YES: GO TO 4.

NO: GO TO 3.

DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E10, F10
- IPDM E/R harness connector E7
- 15 A fuse (No. 46)
- Harness for open or short between A/F sensor 1 and fuse
  Repair or replace harness or connectors.

CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.
Disconnect ECM harness connector.

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

CONTINUITY REFERENCE CHART

DTC	A/F sensor 1			ECM		Continuity
DTC	Bank	Connector	Terminal	Connector	Terminal	Continuity
P0132	1	F67	1	F111	81	Existed
P0132	1	F67	2		82
P0152	2	F68	1		85
P0152	2	F68	2		86

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

CONTINUITY REFERENCE CHART

DTC	A/F sensor 1			ECM		Ground	Continuity
DTC	Bank	Connector	Terminal	Connector	Terminal	Ground	Continuity
P0132	1	F67	1	F111	81	Ground	Not existed
P0132	1	F67	2		82
P0152	2	F68	1		85
P0152	2	F68	2		86

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.

CHECK INTERMITTENT INCIDENT
Perform "INTERMITTENT INCIDENT ".

Is the inspection result normal?

YES: GO TO 6.

NO: Repair or replace malfunctioning part.
REPLACE A/F SENSOR 1
Replace malfunctioning 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