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HOMESERVICE MANUALSNISSAN-DATSUN2024FRONTIER SL, RWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM (DTC/CIRCUIT DIAGNOSIS) (2 OF 6)DTC/CIRCUIT DIAGNOSISDTC P0172: FUEL INJECTION SYSTEM FUNCTIONDIAGNOSIS PROCEDURE
2024 Nissan-Datsun Frontier SL, RWD

Diagnosis Procedure

2024 Nissan-Datsun Frontier SL, RWDSECTION Diagnosis Procedure
  1. CHECK EXHAUST GAS LEAK 
    1. Start engine and run it at idle.
    2. Listen for an exhaust gas leak before three way catalyst 1.
      GNSDB109106Courtesy of NISSAN NORTH AMERICA, INC.

    Is exhaust gas leak detected?

    >>

    Repair or replace.

    >>

    GO TO 2.

  2. CHECK FOR INTAKE AIR LEAK 

    Listen for an intake air leak after the mass air flow sensor.

    Is intake air leak detected?

    >>

    Repair or replace.

    >>

    GO TO 3.

  3. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect corresponding A/F sensor 1 harness connector.
    3. Disconnect ECM harness connector.
    4. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
      A/F sensor 1 ECM Continuity
      Connector Terminal Connector Terminal
      F68 1 F79 101 Existed
      2 102
    5. 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
      F68 1 Ground Not existed
      2
      ECM - Continuity
      Connector Terminal
      F79 101 Ground Not existed
      102
    6. Also check harness for short to power.

    Is the inspection result normal?

    >>

    GO TO 4.

    >>

    Repair or replace error-detected parts.

  4. CHECK FUEL PRESSURE 
    1. Release fuel pressure to zero. Refer to Work Procedure .
    2. Install fuel pressure gauge and check fuel pressure. Refer to Work Procedure .

    Is the inspection result normal?

    >>

    GO TO 5.

    >>

    Replace fuel level sensor unit and fuel pump. Refer to Removal and Installation .

  5. CHECK MASS AIR FLOW SENSOR 

    SYMBOL With CONSULT

    1. Install all removed parts.
    2. Check "Mass air flow sensor (Hz) B1" in "Data Monitor" mode of "ENGINE". For specification, refer to Component Inspection (Mass Air Flow Sensor) .

    SYMBOL With GST

    1. Install all removed parts.
    2. Check mass air flow sensor signal in "Service $01" with GST. For specification, refer to Mass Air Flow Sensor .

    Is the measurement value within the specification?

    >>

    GO TO 6.

    >>

    Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or grounds. Refer to Diagnosis Procedure .

  6. CHECK FUNCTION OF FUEL INJECTOR 

    SYMBOL With CONSULT

    1. Start engine.
    2. Perform "POWER BALANCE" in "Active Test" mode of "ENGINE".
    3. Make sure that each circuit produces a momentary engine speed drop.

    SYMBOL Without CONSULT

    1. Start engine and let it idle.
    2. Listen to each fuel injector operating sound.
      GNSDB111189Courtesy of NISSAN NORTH AMERICA, INC.
      Clicking sound should be heard.

    Is the inspection result normal?

    >>

    INSPECTION END

    >>

    Perform trouble diagnosis for fuel injector, refer to Diagnosis Procedure .

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.