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Home >> Nissan-Datsun >> 2010 >> Cube Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0643 To P2A00 >> P2A00 A/F Sensor 1 >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connection E38. Refer to "CIRCUIT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: Repair or replace ground connection.

  2. CHECK HARNESS CONNECTOR
    1. Disconnect A/F sensor 1 harness connector.
    2. Check harness connector for water.

    Water should not exit. 

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: Repair or replace harness connector.

  3. RETIGHTEN A/F SENSOR 1
    1. Loosen and retighten the A/F sensor 1. Refer to "EXPLODED VIEW ".

    GO TO 4.

  4. CHECK FOR INTAKE AIR LEAK
    1. Reconnect A/F sensor 1 harness connector.
    2. Start engine and run it at idle.
    3. Listen for an intake air leak after the mass air flow sensor.

    Is intake air leak detected? 

    YES: GO TO 5.

    NO: Repair or replace.

  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 or P0172 detected? Is it difficult to start engine? 

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

    NO: GO TO 6.

  6. CHECK 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.
    TERMINAL VOLTAGE REFERENCE CHART

    A/F sensor 1 Ground Voltage
    Connector Terminal
    F50 4 Ground Battery voltage

    Is the inspection result normal? 

    YES: GO TO  8.

    NO: GO TO 7.

  7. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E8, F1
    • IPDM E/R harness connector E45
    • 10 A fuse (No. 54)
    • 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.
      TERMINAL CONTINUITY REFERENCE CHART

      A/F sensor 1 ECM Continuity
      Connector Terminal Connector Terminal
      F50 1 F8 49 Existed
      2 53
    4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.
      TERMINAL CONTINUITY REFERENCE CHART

      A/F sensor 1 Ground Continuity
      Connector Terminal
      F50 1 Ground Not existed
      2
      TERMINAL CONTINUITY REFERENCE CHART

      ECM Ground Continuity
      Connector Terminal
      F8 49 Ground Not existed
      53
    5. Also check harness for short to power.

    Is the inspection result normal? 

    YES: GO TO 9.

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

  9. CHECK A/F SENSOR 1 HEATER

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 10.

    NO: GO TO  11.

  10. CHECK INTERMITTENT INCIDENT

    Perform "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: GO TO 11.

    NO: Repair or replace.

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

    Replace air fuel ratio (A/F) sensor 1.

    CAUTION:
    • Discard any 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 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-III? 

    YES: GO TO 12.

    NO: GO TO  13.

  12. CONFIRM A/F ADJUSTMENT DATA

    With CONSULT-III 

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

    Is "0.000" displayed? 

    YES: INSPECTION END

    NO: GO TO 13.

  13. 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-III? 

    YES: GO TO 14.

    NO: INSPECTION END

  14. CONFIRM A/F ADJUSTMENT DATA

    With CONSULT-III 

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

    INSPECTION END

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