Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground screws on the body.
Refer to "GROUND INSPECTION ".

Fig 1: Checking Ground Connections
Courtesy of NISSAN NORTH AMERICA, INC.

OK or NG

OK: GO TO 2.

NG: Repair or replace ground connections.
CHECK AIR FUEL RATIO SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect air fuel ratio (A/F) sensor 1 harness connector.
  
  Fig 2: Identifying Air Fuel Ratio (A/F) Sensor 1 Harness Connector
  Courtesy of NISSAN NORTH AMERICA, INC.
2. Turn ignition switch ON.
3. Check voltage between A/F sensor 1 terminal 4 and ground with CONSULT or tester.
Voltage: Battery voltage

Fig 3: Checking Voltage Between A/F Sensor 1 Harness Connector Terminal 4 And Ground Using Tester
Courtesy of NISSAN NORTH AMERICA, INC.

OK or NG

OK: GO TO 4.

NG: GO TO 3.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E2, F32
- IPDM E/R harness connector E119
- 15 A fuse (No. 54)
- Harness for open or short between A/F sensor 1 and IPDM E/R
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 harness continuity between A/F sensor 1 terminals and ECM terminals as per the following.

Refer to WIRING DIAGRAM .

	A/F sensor 1 terminal	ECM terminal
Bank1	1	35
Bank1	2	56
Bank 2	1	16
Bank 2	2	75

Continuity should exist .

Check harness continuity between the following terminals and ground.

Refer to WIRING DIAGRAM .

Bank 1		Bank 2
A/F sensor 1 terminal	ECM terminal	A/F sensor 1 terminal	ECM terminal
1	35	1	16
2	56	2	75

Continuity should not exist .

Also check harness for short to power.

OK or NG

OK: GO TO 5.

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

CHECK INTERMITTENT INCIDENT
Perform "INTERMITTENT INCIDENT ".

OK or NG

OK: GO TO 6.

NG: Repair or replace malfunctioning part.
REPLACE A/F SENSOR 1
Replace malfunctioning A/F sensor 1. Refer to EXHAUST MANIFOLD AND THREE WAY CATALYST .
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