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Home >> Nissan-Datsun >> 2014 >> Rogue SL, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes & Symptom Tests) >> DTC/Circuit Diagnosis >> DTC P0171: Fuel Injection System Function >> Diagnosis Procedure

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 (manifold).
      Fig 1: Checking Exhaust System For Gas Leakage
      G09155678Courtesy of NISSAN NORTH AMERICA, INC.

      Is exhaust gas leak detected? 

      YES: Repair or replace error-detected parts.

      NO: GO TO 2.

  2. CHECK FOR INTAKE AIR LEAK 
    1. Listen for an intake air leak after the mass air flow sensor.
    2. Check PCV hose connection.

      Intake air leak detected? 

      YES: Repair or replace error-detected parts.

      NO: 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.
      + - Continuity
      A/F sensor 1 ECM
      Connector Terminal Connector Terminal
      F18 1 F51 41 Existed
      2 45
    5. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.
      + - Continuity
      A/F sensor 1
      Connector Terminal
      F18 1 Ground Not existed
      2
      + - Continuity
      ECM
      Connector Terminal
      F51 41 Ground Not existed
      45
    6. Also check harness for short to power.

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Repair or replace error-detected parts.

  4. CHECK FUEL PRESSURE 

    Check fuel pressure. Refer to "WORK PROCEDURE ".

    Is the inspection result normal? 

    YES: GO TO  6.

    NO: GO TO 5.

  5. DETECT MALFUNCTIONING PART 

    Check fuel hoses and fuel tubes for clogging. Refer to "EXPLODED VIEW ".

    Is the inspection result normal? 

    YES: Replace "fuel filter and fuel pump assembly". Refer to "REMOVAL AND INSTALLATION ".

    NO: Repair or replace error-detected parts.

  6. CHECK MASS AIR FLOW SENSOR 

    With CONSULT

    1. Install all removed parts.
    2. Start engine and warm it up to normal operating temperature.
    3. Check "MASS AIR FLOW SENSOR (Hz)" in "DATA MONITOR" mode of "ENGINE" using CONSULT.
      Monitor item Condition Value
      MASS AIR FLOW SENSOR (Hz) Ignition switch ON (Engine stopped.) Approx. 3500 Hz
      Idle (Engine is warmed-up to normal operating temperature.) 3500 - 4100 Hz
      2, 500 RPM (Engine is warmed-up to normal operating temperature.) 5000 - 5600 Hz
      Idle to about 4, 000 RPM 3500 - 4100 Hz to Approx. 6300 Hz(1)
      (1) Check for linear frequency rise in response to engine being increased to about 4, 000 RPM.

    Without CONSULT

    1. Install all removed parts.
    2. Start engine and warm it up to normal operating temperature.
    3. Check mass air flow sensor signal in Service $01 with GST.
      ECM Condition Value
      Connector + -
      Terminal
      F51 35 34 Ignition switch ON (Engine stopped.) Approx. 3500 Hz
      Idle (Engine is warmed-up to normal operating temperature.) 3500 - 4100 Hz
      2, 500 RPM (Engine is warmed-up to normal operating temperature.) 5000 - 5600 Hz
      Idle to about 4, 000 RPM 3500 - 4100 Hz to Approx. 6300 Hz(1)
      Ignition switch ON (Engine stopped.) Approx. 3500 Hz
      (1) Check for linear frequency rise in response to engine being increased to about 4, 000 RPM.

      Is the measurement value within the specification? 

      YES: GO TO 7.

      NO: Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or grounds. Refer to "DTC DESCRIPTION ".

  7. CHECK FUNCTION OF FUEL INJECTOR 

    With CONSULT

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

    Without CONSULT

    1. Let engine idle.
    2. Listen to each fuel injector operating sound.

      Clicking noise should be heard. 

      Is the inspection result normal? 

      YES: GO TO 8.

      NO: Perform trouble diagnosis for "FUEL INJECTOR", refer to "COMPONENT FUNCTION CHECK ".

      Fig 2: Checking Function Of Fuel Injector Using Tool
      G09155679Courtesy of NISSAN NORTH AMERICA, INC.
  8. CHECK FUEL INJECTOR 
    1. Turn ignition switch OFF.
    2. Confirm that the engine is cooled down and there are no fire hazards near the vehicle.
    3. Disconnect all fuel injector harness connectors.
    4. Remove fuel tube assembly. Refer to "REMOVAL AND INSTALLATION ".

      Keep fuel hose and all fuel injectors connected to fuel tube.

    5. Disconnect all ignition coil harness connectors.
    6. Prepare pans or saucers under each fuel injector.
    7. Crank engine for about 3 seconds.

      Fuel should be sprayed evenly for each fuel injector. 

      Is the inspection result normal? 

      YES: GO TO 9.

      NO: Replace fuel injectors from which fuel does not spray out. Always replace O-ring with new ones. Refer to "REMOVAL AND INSTALLATION ".

      Fig 3: Checking Fuel Injector
      G09155680Courtesy of NISSAN NORTH AMERICA, INC.
  9. CHECK INTERMITTENT INCIDENT 

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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