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 two 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.
RETIGHTEN A/F SENSOR 1 AND HEATED OXYGEN SENSOR 2
Loosen and retighten the A/F sensor 1 and heated oxygen sensor 2. Refer to "EXPLODED VIEW " and "REMOVAL AND INSTALLATION ".

: GO TO 3.
CHECK FOR EXHAUST GAS LEAK
1. Start engine and run it at idle.
2. Listen for an exhaust gas leak before the three way catalyst 2.
  Is exhaust gas detected?
  
  YES: Repair or replace.
  
  NO: GO TO 4.
CHECK FOR INTAKE AIR LEAK
1. Start engine and run it at idle.
2. Listen for an intake air leak after the mass air flow sensor.
  OK or NG
  
  OK: GO TO 5.
  
  NG: Repair or replace.
CLEAR THE SELF-LEARNING DATA
With CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CONSULT.
3. Clear the self-learning control coefficient by touching "CLEAR".
4. Run engine for at least 10 minutes at idle speed.
  Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected?
  
  Is it difficult to start engine?
Without CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF.
3. Disconnect mass air flow sensor harness connector.
4. Restart engine and let it idle for at least 5 seconds.
5. Stop engine and reconnect mass air flow sensor harness connector.
6. Make sure DTC P0102 is displayed.
7. Erase the DTC memory. Refer to "CONSULT FUNCTION " or "ON BOARD DIAGNOSIS FUNCTION ".
8. Make sure DTC P0000 is displayed.
9. Run engine for at least 10 minutes at idle speed.
  Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected?
  
  Is it difficult to start engine?
  
  Fig 2: Identifying Mass Air Flow Sensor
  Courtesy of NISSAN NORTH AMERICA, INC.
  
  Yes or No
  
  Yes: Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to P0171, P0174 FUEL INJECTION SYSTEM FUNCTION or P0172, P0175 FUEL INJECTION SYSTEM FUNCTION .
  
  No: GO TO 6.
CHECK HARNESS CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector.
  
  Fig 3: Identifying Air Fuel Ratio Sensor 1 And Harness Connector
  Courtesy of NISSAN NORTH AMERICA, INC.
3. Check harness connector for water.
  Water should not exit .
  
  OK or NG
  
  OK: GO TO 7.
  
  NG: Repair or replace harness connector.
CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between A/F sensor 1 terminal 4 and ground with CONSULT or tester.
  Voltage: Battery voltage
  
  OK or NG
  
  OK: GO TO 9.
  
  NG: GO TO 8.
  
  Fig 4: Checking Voltage Between Air Fuel Ratio Sensor 1 Terminal 4 And Ground
  Courtesy of NISSAN NORTH AMERICA, INC.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E5, F14
- IPDM E/R harness connector E119
- 15A fuse
- 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 harness continuity between A/F sensor 1 terminal and ECM terminal as follows.

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 10.

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 11.

NG: GO TO 13.
CHECK HEATED OXYGEN SENSOR 2
Refer to "COMPONENT INSPECTION ".

Is the inspection result normal?

YES: GO TO 12.

NO: Replace heated oxygen sensor 2. Refer to "REMOVAL AND INSTALLATION ".
CHECK INTERMITTENT INCIDENT
Refer to "HOW TO CHECK TERMINAL " and "INTERMITTENT INCIDENT ".

OK or NG

OK: GO TO 13.

NG: Repair or replace.
REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1.
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 tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.
: GO TO 14.
CONFIRM A/F ADJUSTMENT DATA
1. Turn ignition switch OFF and then ON.
2. Select "A/F ADJ-B1" and "A/F ADJ-B2" in "DATA MONITOR" mode with CONSULT.
3. Make sure that "0.000" is displayed on CONSULT screen.
  OK or NG
  
  OK: INSPECTION END
  
  NG: GO TO 15.
CLEAR THE SELF-LEARNING DATA
With CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CONSULT.
3. Clear the self-learning control coefficient by touching "CLEAR".
Without CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF.
3. Disconnect mass air flow sensor harness connector.
4. Restart engine and let it idle for at least 5 seconds.
5. Stop engine and reconnect mass air flow sensor harness connector.
6. Make sure DTC P0102 is displayed.
7. Erase the DTC memory. Refer to "CONSULT FUNCTION " or "ON BOARD DIAGNOSIS FUNCTION ".
8. Make sure DTC P0000 is displayed.
  : GO TO 16.
  
  Fig 5: Identifying Mass Air Flow Sensor
  Courtesy of NISSAN NORTH AMERICA, INC.
CONFIRM A/F ADJUSTMENT DATA
1. Turn ignition switch OFF and then ON.
2. Select "A/F ADJ-B1" and "A/F ADJ-B2" in "DATA MONITOR" mode with CONSULT.
3. Make sure that "0.000" is displayed on CONSULT screen.
  :INSPECTION END