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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1167 (Engine Control System - DTCS P1225 To P2A03) >> P2A00, P2A03 A/F Sensor 1 >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connection E9. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: Repair or replace ground connection.

  2. RETIGHTEN A/F SENSOR 1

    Loosen and retighten the A/F sensor 1. Refer to "REMOVAL AND INSTALLATION ".

    : GO TO 3.

  3. CHECK FOR INTAKE AIR LEAKAGE
    1. Start engine and run it at idle.
    2. Listen for an intake air leakage after the mass air flow sensor.

    Is intake air leakage detected? 

    YES: GO TO 4.

    NO: Repair or replace malfunctioning part.

  4. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
    1. Clear the mixture ratio self-learning value. Refer to "MIXTURE RATIO SELF-LEARNING VALUE CLEAR: SPECIAL REPAIR REQUIREMENT ".
    2. Run engine for at least 10 minutes at idle speed.

    Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected? Is it difficult to start engine? 

    YES: Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to "DTC LOGIC " or "DTC LOGIC ".

    NO: GO TO 5.

  5. CHECK HARNESS CONNECTOR
    1. Turn ignition switch OFF.
    2. Disconnect A/F sensor 1 harness connector.
    3. Check that water is not inside connectors.

    Is the inspection result normal? 

    YES: GO TO 6.

    NO: Repair or replace harness connector.

  6. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
    1. Disconnect A/F sensor 1 harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between A/F sensor 1 harness connector and ground.
      VOLTAGE SPECIFICATION

      DTC A/F sensor Ground Voltage (V)
      Bank Connector Terminal
      P2A00 1 F12 4 Ground Battery voltage
      P2A03 2 F61 4
      Fig 1: Checking Voltage Between A/F Sensor 1 Harness Connector And Ground
      G05869964Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 8.

    NO: GO TO 7.

  7. DETECT MALFUNCTIONING PART

    Check the following.

    • IPDM E/R harness connector F10
    • 15 A fuse (No. 37)
    • Harness for open or short between A/F sensor 1 and fuse

    : Repair or replace harness or connectors.

  8. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
      CONTINUITY CHART

      DTC A/F sensor 1 ECM Continuity
      Bank Connector Terminal Connector Terminal
      P2A00 1 F12 1 F13 45 Existed
      2 49
      P2A03 2 F61 1 53
      2 57
    4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.
      CONTINUITY CHART

      DTC A/F sensor 1 Ground Continuity
      Bank Connector Terminal
      P2A00 1 F12 1 Ground Not existed
      2
      P2A03 2 F61 1
      2
      CONTINUITY CHART

      DTC ECM Ground Continuity
      Connector Terminal
      P2A00 F13 45 Ground Not existed
      49
      P2A03 53
      57
    5. Also check harness for short to power.

      Is the inspection result normal? 

    YES: GO TO 9.

    NO: Repair open circuit, short to ground or short to power in harness or connectors.

  9. CHECK INTERMITTENT INCIDENT

    Perform "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: GO TO 10.

    NO: Repair or replace malfunctioning part.

  10. REPLACE AIR FUEL RATIO (A/F) SENSOR 1

    Replace malfunctioning air fuel ratio (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 [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant (commercial service tool).

    : INSPECTION END

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