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HOMESERVICE MANUALSNISSAN-DATSUN2024FRONTIER SL, RWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM (DTC/CIRCUIT DIAGNOSIS) (5 OF 6)DTC/CIRCUIT DIAGNOSISDTC P2098: A/F SENSOR 1DIAGNOSIS PROCEDURE
2024 Nissan-Datsun Frontier SL, RWD

Diagnosis Procedure

2024 Nissan-Datsun Frontier SL, RWDSECTION Diagnosis Procedure
  1. CHECK GROUND CONNECTION 
    1. Turn ignition switch OFF.
    2. Check ground connection E24. Refer to Ground Inspection in Circuit Inspection .

    Is the inspection result normal?

    >>

    GO TO 2.

    >>

    Repair or replace ground connection.

  2. RETIGHTEN A/F SENSOR 1 AND HEATED OXYGEN SENSOR 2 
    1. Loosen and retighten the A/F sensor 1 and heated oxygen sensor 2. Refer to Removal and Installation (A/F sensor) and Removal and Installation (Heated oxygen sensor 2).

    >>

    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?

    >>

    Repair or replace.

    >>

    GO TO 4.

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

    Is intake air leak detected?

    >>

    Repair or replace.

    >>

    GO TO 5.

  5. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE 
    1. Clear the mixture ratio self-learning value. Refer to Description .
    2. Run engine for at least 10 minutes at idle speed.

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

    >>

    Perform trouble diagnosis for DTC P0174 or P0175.

    >>

    GO TO 6.

  6. CHECK HARNESS CONNECTOR 
    1. Turn ignition switch OFF.
    2. Disconnect A/F sensor 1 harness connector.
    3. Check harness connector for water.
      Water should not exit.

    Is the inspection result normal?

    >>

    GO TO 7.

    >>

    Repair or replace harness connector.

  7. CHECK A/F SENSOR 1 POWER SUPPLY 
    1. Turn ignition switch ON.
    2. Check the voltage between A/F sensor 1 harness connector and ground.
      + - Voltage
      A/F sensor 1
      Connector Terminal
      F76 4 Ground Battery voltage

    Is the inspection result normal?

    >>

    GO TO 9.

    >>

    GO TO 8.

  8. CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT 
    1. Turn ignition switch ON.
    2. Check the voltage between A/F sensor 1 harness connector and IPDM E/R harness connector.
      A/F sensor 1 IPDM E/R Continuity
      Connector Terminal Connector Terminal
      F76 4 E121 26 Existed
    3. Also check harness for short to ground.

    Is the inspection result normal?

    >>

    Perform the trouble diagnosis for power supply circuit.

    >>

    Repair or replace error-detected parts.

  9. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT 
    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.
      A/F sensor 1 ECM Continuity
      Connector Terminal Connector Terminal
      F76 1 F79 105 Existed
    4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.
      A/F sensor 1 - Continuity
      Connector Terminal
      F76 1 Ground Not existed
      ECM - Continuity
      Connector Terminal
      F79 105 Ground Not existed
    5. Also check harness for short to power.

    Is the inspection result normal?

    >>

    GO TO 10.

    >>

    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 (A/F Sensor 1 Heater) .

    Is the inspection result normal?

    >>

    GO TO 11.

    >>

    GO TO 13.

  11. CHECK HEATED OXYGEN SENSOR 2 

    Refer to Component Inspection .

    Is the inspection result normal?

    >>

    GO TO 12.

    >>

    Replace malfunctioning heated oxygen sensor 2. Refer to Removal and Installation .

  12. CHECK INTERMITTENT INCIDENT 

    Perform Intermittent Incident .

    Is the inspection result normal?

    >>

    GO TO 13.

    >>

    Repair or replace.

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

    Replace air fuel ratio (A/F) sensor 1. Refer to Removal and Installation .

    Do you have CONSULT '

    >>

    GO TO 14.

    >>

    GO TO 15.

  14. CONFIRM A/F ADJUSTMENT DATA 

    SYMBOL With CONSULT

    1. Turn ignition switch ON.
    2. On CONSULT screen, select "ENGINE">>"Data Monitor">>"A/F ADJ-B1" and "A/F ADJ-B2".
    3. Make sure that "0.000" is displayed on CONSULT screen.

    Is "0.000" displayed?

    >>

    INSPECTION END

    >>

    GO TO 15.

  15. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE 

    Clear the mixture ratio self-learning value. Refer to Description .

    Do you have CONSULT '

    >>

    GO TO 16.

    >>

    INSPECTION END

  16. CONFIRM A/F ADJUSTMENT DATA 

    SYMBOL With CONSULT

    1. Turn ignition switch ON.
    2. On CONSULT screen, select "ENGINE">>"Data Monitor">>"A/F ADJ-B1" and "A/F ADJ-B2".
    3. Make sure that "0.000" is displayed on CONSULT screen.

    >>

    INSPECTION END

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.