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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 2388 (Engine Control System - DTCS U1000 To P0159) >> DTC P0031, P0032, P0051, P0052 A/F Sensor 1 Heater >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. 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 three ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 1: Locating Body Ground Screws
      G04895412Courtesy of NISSAN NORTH AMERICA, INC.

    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 A/F Sensor 1 Harness Connector
      G04911564Courtesy of NISSAN NORTH AMERICA, INC.
    2. Turn ignition switch ON.
    3. Check voltage between air fuel ratio sensor 1 terminal 4 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

      Fig 3: Checking Voltage Between A/F Sensor 1 Terminal 4 And Ground
      G04874929Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO  4.

    NG: GO TO 3.

  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E2, F32
    • IPDM E/R harness connector E119
    • 15A fuse
    • Harness for open or short between air fuel ratio sensor 1 and fuse

      Repair or replace harness or connectors.

  4. CHECK AIR FUEL RATIO (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, 43 (bank 2) and air fuel ratio (A/F) sensor 1 terminal 3.

      Refer to Wiring Diagram .

      Continuity should exist. 

    4. Also check harness for short to ground or 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 AIR FUEL RATIO (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 AIR FUEL RATIO (A/F) SENSOR 1 

    Replace malfunctioning 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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