Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Nissan Armada. 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 three ground screws on the body.
  Refer to "GROUND INSPECTION ".
  
  Fig 1: Identifying Body Ground Screws
  Courtesy of NISSAN NORTH AMERICA, INC.
  
  OK or NG
  
  OK: GO TO 2.
  
  NG: Repair or replace ground connections.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect air fuel ratio (A/F) sensor 1 harness connector.
  
  Fig 2: Identifying Air Fuel Ratio Sensor 1 And 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
  
  OK or NG
  
  OK: GO TO 4.
  
  NG: GO TO 3.
  
  Fig 3: Checking Voltage Between Air Fuel Ratio Sensor And Ground
  Courtesy of NISSAN NORTH AMERICA, INC.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E5, F14
- IPDM E/R harness connector E119
- 15 A fuse (No. 54)
- Harness for open or short between A/F sensor 1 and fuse
  : Repair or replace harness or connectors.
CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 2 (bank 1) or 24, 43 (bank 2) and A/F sensor 1 terminal 3.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist.
4. Also check harness for short to ground and 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 A/F SENSOR 1 HEATER
Refer to "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 6.

NG: Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to "EXPLODED VIEW ".
CHECK INTERMITTENT INCIDENT
Refer to "HOW TO CHECK TERMINAL " and "INTERMITTENT INCIDENT ".

INSPECTION END