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Home › Nissan-Datsun › 2005 › Armada LE, RWD › Repair and Diagnosis › Engine Performance › Engine Control System › DTC P1276, P1286: A/F Sensor 1 › Diagnostic Procedure

Diagnostic Procedure

  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten three ground screws on the body.

      Refer to Ground Inspection .

      Fig 1: Loosening Ground Screws
      G02444021Courtesy 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 A/F sensor 1 harness connector.
      Fig 2: Disconnecting A/F Sensor 1 Harness Connector
      G02444022Courtesy 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  4.
    • NG: GO TO  3.
    Fig 3: Checking Voltage Between A/F Sensor 1 Terminal & Ground
    G02444023Courtesy of NISSAN MOTOR CO., U.S.A.
  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E5, F14
    • IPDM E/R harness connector E119
    • 10A fuse
    • Harness for open or short between A/F sensor 1 and fuse
      • Repair or replace harness or connectors.
  4. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between A/F sensor 1 terminal and ECM terminal as follows.

      Refer to Wiring Diagram .

      Fig 4: ECM Terminal Specification Chart
      G02444024Courtesy 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: ECM Terminal Specification Chart
      G02444025Courtesy 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  5.
    • NG: Repair open circuit or short to ground or short to power in harness or connectors.
  5. CHECK INTERMITTENT INCIDENT 

    Perform TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    OK or NG 

    • OK: GO TO  6.
    • NG: Repair or replace.
  6. 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 Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12) and approved anti-seize lubricant. 
    • INSPECTION END
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