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Home >> Nissan-Datsun >> 2012 >> Maxima SV >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1225 To P2A03 >> DTC P2A00, P2A03: A/F Sensor 1 >> Diagnosis Procedure

Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM-ENGINE CONTROL SYSTEM- ".

  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 AND HEATED OXYGEN SENSOR 2

    Loosen and retighten the A/F sensor 1 and heated oxygen sensor 2. Refer to "REMOVAL AND INSTALLATION (LH) ".

    : GO TO 3.

  3. CHECK FOR EXHAUST GAS LEAK
    1. Start engine and run it at idle.
    2. Listen for an exhaust gas leak before the three way catalyst 2.

      Is exhaust gas detected? 

      YES: Repair or replace.

      NO: GO TO 4.

  4. 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 5.

      NO: Repair or replace malfunctioning part.

  5. 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 6.

  6. 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 7.

      NO: Repair or replace harness connector.

  7. 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.
      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 Terminal 4 And Ground
      G08146010Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO  9.

      NO: GO TO 8.

  8. 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.

  9. 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.
      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.
      DTC A/F sensor 1 Ground Continuity
      Bank Connector Terminal
      P2A00 1 F12 1 Ground Not existed
      2
      P2A03 2 F61 1
      2
      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 10.

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

  10. CHECK A/F SENSOR 1 HEATER

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 11.

    NO: GO TO  13.

  11. CHECK HEATED OXYGEN SENSOR 2

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 12.

    NO: Replace heated oxygen sensor 2. Refer to "REMOVAL AND INSTALLATION (LH) ".

  12. CHECK INTERMITTENT INCIDENT

    Perform "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: GO TO 13.

    NO: Repair or replace malfunctioning part.

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

    Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to "REMOVAL AND INSTALLATION (LH) ".

    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).

    Do you have CONSULT? 

    YES: GO TO 14.

    NO: GO TO  15.

  14. CONFIRM A/F ADJUSTMENT DATA

    With CONSULT 

    1. Turn ignition switch ON.
    2. Select "A/F ADJ-B1" and "A/F ADJ-B2" in "DATA MONITOR" mode with CONSULT.
    3. Make sure that "0.000" is displayed on CONSULT screen.

      Is "0.000" displayed? 

      YES: INSPECTION END

      NO: GO TO 15.

  15. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE

    Clear the mixture ratio self-learning value. Refer to "MIXTURE RATIO SELF-LEARNING VALUE CLEAR: SPECIAL REPAIR REQUIREMENT ".

    Do you have CONSULT? 

    YES: GO TO 16.

    NO: INSPECTION END

  16. CONFIRM A/F ADJUSTMENT DATA

    With CONSULT 

    1. Turn ignition switch ON.
    2. Select "A/F ADJ-B1" and "A/F ADJ-B2" in "DATA MONITOR" mode with CONSULT.
    3. Make sure that "0.000" is displayed on CONSULT screen.

      : INSPECTION END

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