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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 2340 (Engine Control System - DTCS U1000 To P0153) >> DTC P0031, P0032, P0051, P0052 A/F Sensor 1 Heater >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2008 Nissan Maxima. 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 four ground screws on the body.

      Refer to "GROUND INSPECTION ."

      Fig 1: Identifying Body Grounds
      G04915248Courtesy 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: Identifying Intake Manifold Collector, Air Fuel Ratio Sensor Connector And Radiator
      G04915268Courtesy 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-III or tester.

      Voltage: Battery voltage 

    Fig 3: Checking Voltage Between A/F Sensor 1 Terminal 3 And Ground
    G04894593Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  4.

    NG: GO TO  3.

  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M70, F58
    • Fuse block (J/B) connector M4
    • 15A 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 HEATER OUTPUT SIGNAL CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between ECM terminal 2 (bank 1) or 24 (bank 2) and A/F sensor 1 terminal 4. 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: GO TO  7.

  6. CHECK INTERMITTENT INCIDENT 

    Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ."

    OK or NG 

    OK: GO TO  7.

    NG: Repair or replace.

  7. REPLACE A/F SENSOR 1 

    Replace malfunctioning 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.

    8. INSPECTION END 

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