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Home >> Nissan-Datsun >> 2008 >> Sentra SL >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Control System - DTCS U1000 To P0153 (Qr25DE)) >> DTC P0031, P0032, P0051, P0052 A/F Sensor 1 Heater >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screws on the body.

      Refer to "GROUND INSPECTION ".

      Fig 1: Identifying Body Ground Connections
      G04925802Courtesy 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.
      • Air fuel ratio (A/F) sensor 1 (Bank 1) harness connector (1)
      • Air fuel ratio (A/F) sensor 1 (Bank 1) (2)
      • Air fuel ratio (A/F) sensor 1 (Bank 2) (3)
      • Air fuel ratio (A/F) sensor 1(Bank 2) harness connector (4)
    2. Turn ignition switch ON.
      Fig 2: Identifying Air Fuel Ratio Sensor 1 Harness Connector
      G04925803Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between A/F sensor 1 terminal 4 and ground with CONSULT-III 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 4 And Ground
    G04874929Courtesy of NISSAN MOTOR CO., U.S.A.
  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E3, F2 (Bank 1)
    • Harness connectors E17, F10 (Bank 2)
    • Fuse block (J/B) connector E39 (Bank 2)
    • 10A fuse (Bank 1)
    • 15A fuse (Bank 2)
    • Harness for open or short between A/F sensor 1 and fuse

      : Repair or replace harness or connectors.

  4. 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 4 (Bank 1) or 8 (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.

  5. 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.

  6. CHECK INTERMITTENT INCIDENT 

    Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    : INSPECTION END 

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