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СИСТЕМА ECD (для моделей без контроллера свечей накаливания), Diagnostic DTC:P0101

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DTC Code DTC Name
P0101 Mass Air Flow Circuit Range / Performance Problem
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DESCRIPTION

Refer to DTC P0102.

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DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0101 Mass Air Flow Circuit Range / Performance Problem

Actual value of mass air flow rate exceeds the threshold for 3 seconds or more

(2 trip detection logic)

  • Open or short in mass air flow meter circuit

  • Mass air flow meter

  • Contamination in mass air flow meter

  • Diesel turbo pressure sensor

  • Electric EGR control valve assembly

  • Open or short in electric EGR control valve assembly circuit

  • EGR passage

  • Open or short in diesel throttle motor circuit

  • Diesel throttle body assembly

  • Vacuum hose

  • ECM

 Comes on DTC stored
Table 1. DTC Detection Drive Pattern
DTC No. DTC Detection Drive Pattern
P0101

Both of the following conditions are met:


  • Vehicle being driven in 3rd gear with warm engine

  • Engine speed decelerated from more than 2600 rpm to 1200 rpm when accelerator pedal fully released
Table 2. Related Data List
DTC No. Data List
P0101 MAF
Tip:

  • If DTC P0101 is stored, the following symptoms may appear:


    • Black smoke

    • Poor acceleration

    • Combustion noise increases

    • Lack of power due to a fail-safe operation

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CAUTION / NOTICE / HINT

Note:

  • When replacing the ECM, perform ECM Initialization and Registration.

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  • Inspect the fuses for circuits related to this system before performing the following procedure.

Tip:

  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing a new ECM, perform all of the initialization and registration procedures for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

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PROCEDURE


  1. Click here

    CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0101)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    4. Read the DTCs.


      1. Powertrain > Engine and ECT > Trouble Codes


      Result
      Result Proceed to
      DTC P0101 is output A
      DTC P0101 and other DTCs are output B
      Tip:

      If any DTCs other than P0101 are output, troubleshoot those DTCs first.


  2. Click here

    CHECK CONNECTION OF VACUUM HOSES

    OK
    The vacuum hoses are appropriately connected to each other.
    Tip:

    • Check the vacuum hose connection of the diesel turbo pressure sensor.

    • Check that there are no air leaks in the diesel turbo pressure sensor vacuum hose.

    Result
    Proceed to
    OK
    NG

  3. Click here

    READ VALUE USING GTS (MAF)


    1. Connect the GTS to the DLC3.

    2. Start the engine and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / MAF and Coolant Temp.


      1. Powertrain > Engine and ECT > Data List
        Tester Display
        MAF
        Coolant Temp





    4. Allow the engine to idle until the Coolant Temp reaches 75°C (167°F) or higher.

    5. Read MAF with the engine idling and at an engine speed of 2000 rpm.

      Standard
      Item Condition Specified Condition
      MAF Idling (EGR valve open) 3.5 to 7 gm/sec
      Idling (EGR valve closed) 8 to 12 gm/sec
      2000 rpm 10 to 40 gm/sec
      Tip:

      • The shift lever should be in neutral and the A/C switch and all accessory switches should be off.

      • When reading the values of Data List, confirm that PM regeneration is not activating (value of "After Injection Period" is 0) by entering the following menus: Powertrain / Engine and ECT / Data List / After Injection Period.

        If PM regeneration is activated (value of "After Injection Period" is not 0), drive the vehicle until PM regeneration is complete (value of "After Injection Period" becomes 0).

      • When idling, EGR cut occurs under either of the following conditions:


        • PM regeneration is activated.

        • Idling time is long (approximately 20 minutes or more).

      If EGR is cut off when idling and PM regeneration is not activated, when the vehicle is driven in 4th gear between 90 and 100 km/h (56 and 62 mph) for 30 minutes, EGR resumes.

      Result
      Proceed to
      OK
      NG

  4. Click here

    CHECK INTAKE AND EXHAUST SYSTEM


    1. Check for air leaks and blockage between the air cleaner case and the turbocharger, and between the turbocharger and the intake manifold.

      OK
      No air leak or blockage.
      Result
      Proceed to
      OK
      NG

  5. Click here

    READ VALUE USING GTS (MAP AND ATMOSPHERE PRESSURE)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / MAP and Atmosphere Pressure.


      1. Powertrain > Engine and ECT > Data List
        Tester Display
        Atmosphere Pressure
        MAP





    4. Compare the values when the ignition switch is ON.

      Standard
      Difference between MAP and Atmosphere Pressure is less than 7 kPa.
      Tip:

      Standard atmospheric pressure is 101 kPa. For every 100 m increase in altitude, pressure drops by 1 kPa. Atmospheric pressure varies with the weather.

      Result
      Proceed to
      OK
      NG

  6. Click here

    PERFORM ACTIVE TEST USING GTS (DIESEL THROTTLE TARGET ANGLE)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Active Test / Diesel Throttle Target Angle / Data List / Actual Throttle Position.


      1. Powertrain > Engine and ECT > Active Test
        Active Test Display
        Diesel Throttle Target Angle
        Data List Display
        Actual Throttle Position





    4. When changing the Active Test value from 0 to 90%, check that Actual Throttle Position smoothly changes to the set opening angle.

      OK
      Value smoothly changes to the set opening angle.
      Result
      Proceed to
      OK
      NG

  7. Click here

    PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / Actual EGR Valve Pos.


      1. Powertrain > Engine and ECT > Active Test
        Active Test Display
        Control the EGR Step Position
        Data List Display
        Actual EGR Valve Pos.





    4. When changing the Active Test value from 1 to 100%, check that Actual EGR Valve Pos. smoothly changes to the set opening angle.

      OK
      Value smoothly changes to the set opening angle.
      Result
      Proceed to
      OK
      NG

  8. Click here

    REPLACE MASS AIR FLOW METER


    1. Replace the mass air flow meter.

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      Result
      Proceed to
      NEXT

  9. Click here

    CHECK WHETHER DTC OUTPUT RECURS (DTC P0101)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs.


      1. Powertrain > Engine and ECT > Clear DTCs


    4. Start the engine and allow it to idle until the engine coolant temperature reaches 70°C (158°F) or higher.

    5. Drive the vehicle in 3rd gear, decelerate from more than 2600 rpm to 1200 rpm with the accelerator pedal fully released.

      CAUTION:

      When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    6. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.

    7. Confirm that the pending DTC is not output again.


      1. Powertrain > Engine and ECT > Trouble Codes


      Result
      Proceed to
      NEXT

    • NEXT

      END

  10. Click here

    REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY


    1. Replace the electric EGR control valve assembly.

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      Result
      Proceed to
      NEXT

  11. Click here

    REPLACE DIESEL THROTTLE BODY ASSEMBLY


    1. Replace the diesel throttle body assembly.

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      Result
      Proceed to
      NEXT

  12. Click here

    REPLACE DIESEL TURBO PRESSURE SENSOR


    1. Replace the diesel turbo pressure sensor.

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      Result
      Proceed to
      NEXT

  13. Click here

    REPAIR OR REPLACE INTAKE AND EXHAUST SYSTEM

    Result
    Proceed to
    NEXT

  14. Click here

    REPAIR OR REPLACE VACUUM HOSE

    Result
    Proceed to
    NEXT