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Home >> Nissan-Datsun >> 2005 >> Murano S, FWD >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> DTC P1271, P1281: A/F Sensor 1 >> Diagnostic Procedure
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Diagnostic Procedure

  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten two ground screws on the body. Refer to GROUND INSPECTION .
    Fig 1: Checking Ground Connections
    G02466592Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK: GO TO  2.
    • NG: Repair or replace ground connections.
  2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT 
    1. Disconnect air fuel ratio (A/F) sensor 1 harness connector.
      Fig 2: Disconnecting Air Fuel Ratio (A/F) Sensor 1 Harness Connector
      G02466593Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Turn ignition switch ON.
    3. Check voltage between A/F sensor 1 terminal 3 and ground with CONSULT-II or tester.
      • Voltage: Battery voltage 

    OK or NG 

    • OK: GO TO  8.
    • NG: GO TO  3.
    Fig 3: Checking Voltage Between A/F Sensor 1 Terminal & Ground
    G02466594Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK CONDENSER CIRCUIT-I 
    1. Turn ignition switch OFF.
    2. Disconnect fuse block (J/B) harness connector M1.
    3. Check resistance between fuse block (J/B) terminal 9A and ground. Refer to WIRING DIAGRAM .
      • Resistance: Above 1 MΩ at 25°C (77°F) 
    4. Also check harness for short to ground and short to power.

    OK or NG 

    • OK: GO TO  4.
    • NG: GO TO  5.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M82, F102
    • Fuse block (J/B) connector M1
    • 15A fuse
    • Harness for open or short between A/F sensor 1 and fuse
      • Repair harness or connectors.
  5. CHECK CONDENSER CIRCUIT-II 
    1. Disconnect condenser harness connectors.
    2. Check harness continuity between fuse block (J/B) terminal 9A and condenser terminal 1, condenser terminal 2 and ground.

      Refer to WIRING DIAGRAM .

      • Continuity should exist. 
    3. Also check harness for short to ground and short to power.

    OK or NG 

    • OK: GO TO  6.
    • NG: Repair harness or connectors.
  6. CHECK CONDENSER 

    Refer to CONDENSER .

    OK or NG 

    • OK: GO TO  7.
    • NG: Replace condenser.
  7. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    • INSPECTION END 
  8. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between the following terminals. Refer to WIRING DIAGRAM .
      Fig 4: Terminal Continuity Reference Chart (1 Of 2)
      G02466595Courtesy of NISSAN MOTOR CO., U.S.A.
      • Continuity should exist. 
    4. Check harness continuity between the following terminals and ground. Refer to WIRING DIAGRAM .
      Fig 5: Terminal Continuity Reference Chart (2 Of 2)
      G02466596Courtesy of NISSAN MOTOR CO., U.S.A.
      • Continuity should not exist. 
    5. Also check harness for short to power.

    OK or NG 

    • OK: GO TO  9.
    • NG: Repair open circuit or short to ground or short to power in harness or connectors.
  9. CHECK INTERMITTENT INCIDENT 

    Perform TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    OK or NG 

    • OK: Go to  10.
    • NG: Repair or replace.
  10. REPLACE AIR FUEL RATIO (A/F) SENSOR 1 

    Replace air fuel ratio (A/F) sensor 1.

    CAUTION:
    • Discard any air fuel ratio (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 air fuel ratio (A/F) sensor, clean exhaust system threads using Heated Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant. 
    • INSPECTION END 
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