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Home >> Nissan-Datsun >> 2003 >> Sentra SE-R, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 588 (Engine Control System - Coupe) >> DTC P1276, P1286: A/F Sensor 1 >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.
  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: DTC P1276, P1286 Loosening & Retighten Two Ground Screws On Body
      G02333980Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  2.
    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: DTC P1276, P1286 Disconnecting Air Fuel Ratio Sensor 1 Harness Connector
      G02333981Courtesy 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 

    1. OK: GO TO  4.
    2. NG: GO TO  3.
    Fig 3: DTC P1276, P1286 Checking Voltage A/F Sensor 1 Terminal 3 & Ground
    G02333982Courtesy of NISSAN MOTOR CO., U.S.A.
  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M72, F102
    • Harness connectors E108, M15
    • IPDM E/R harness connector E7
    • 15A fuse
    • Harness for open or short between A/F sensor 1 and fuse
      1. 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 the following terminals. Refer to Wiring Diagram.
      Fig 4: DTC P1276, P1286 Checking Harness Continuity In ECM Terminals
      G02333983Courtesy of NISSAN MOTOR CO., U.S.A.
      1. Continuity should exist. 
    4. Check harness continuity between the following terminals and ground. Refer to Wiring Diagram.
      Fig 5: DTC P1276, P1286 Checking Harness Continuity In ECM Terminals & Ground
      G02333984Courtesy of NISSAN MOTOR CO., U.S.A.
      1. Continuity should not exist. 
    5. Also check harness for short to power.

    OK or NG 

    1. OK: GO TO  5.
    2. 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 

    1. OK: Replace A/F sensor 1.
    2. NG: Repair or replace.
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