ECD SYSTEM(w/o DPF), Diagnostic DTC:P0101

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

DESCRIPTION

Refer to DTC P0102 Click here.

P0101
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
After the engine is completely warmed up, perform the following procedure 3 times: from a vehicle speed of 60 km/h (37 mph), accelerate the vehicle to 80 km/h (50 mph), quickly release the accelerator pedal and do not depress it for 7 seconds or more.

After the engine is completely warmed up, while the accelerator pedal is released for 7 seconds or more and the vehicle is decelerating, the intake air volume is higher or lower than the threshold* (EGR valve fully closed and throttle valve is fully open).

(2 trip detection logic)

  • Mass air flow meter

  • Intake air temperature sensor (turbo)

  • Manifold absolute pressure sensor

  • No. 1 or No. 2 EGR valve assembly

  • ECM

  • Open or short in mass air flow meter circuit

*: There is a threshold for a low airflow rate malfunction and high airflow rate malfunction. The threshold is different depending on the values of "Engine Speed", "MAP" and "Intake Air Temp (Turbo)".

Tech Tips


  • Low airflow rate malfunction: For example, when the vehicle is decelerating, if "MAF" is 20 gm/sec or less, a low airflow malfunction is confirmed to be present (when "Engine Speed" is 1600 rpm, "MAP" is 110 kPa and "Intake Air Temp (Turbo)" is 35°C).

  • High airflow rate malfunction: For example, when the vehicle is decelerating, if "MAF" is 42 gm/sec or more, a high airflow malfunction is confirmed to be present (when "Engine Speed" is 1600 rpm, "MAP" is 110 kPa and "Intake Air Temp (Turbo)" is 35°C).

Related Data List
DTC No. Data List
P0101

  • MAF

  • MAP

  • Engine Speed

  • Intake Air Temp (Turbo)

  • Target EGR Valve Pos

  • Target EGR Valve Pos #2

  • Actual EGR Valve Pos

  • Actual EGR Valve Pos #2

Tech Tips

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


  1. As the ECU mistakenly determines that there is less air than the actual intake air amount, EGR is decreased to match the target EGR.


    • Combustion noise worsens

  2. As the ECU mistakenly determines that there is more air than the actual intake air amount, EGR is increased to match the target EGR:


    • Misfire

    • White smoke

    • Black smoke

WIRING DIAGRAM

Refer to DTC P0102 Click here

CAUTION / NOTICE / HINT

Note


  • After replacing the ECM, the new ECM needs registration (See page ) and initialization Click here.

  • After replacing the fuel supply pump assembly, the ECM needs initialization Click here.

  • After replacing an injector assembly, the ECM needs registration Click here.

Tech Tips

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.

PROCEDURE


  1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0101)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

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

    4. Read the DTCs.

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

      Tech Tips

      If codes other than P0101 are output, perform troubleshooting for those DTCs first.


    A

    GO TO DTC CHART Click here

    B

  2. CHECK FREEZE FRAME DATA (MASS AIR FLOW RATE AND ENGINE SPEED)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. Check the freeze frame data.

      Result
      Result Proceed to

      • Engine speed 1350 rpm or less

      • MAF 246.0 gm/sec or more

      		 A

      • Engine speed 1350 rpm or more

      • MAF 0.03 gm/sec or less
      Except above B

    B

    READ VALUE USING GTS (MASS AIR FLOW RATE AND ENGINE SPEED) Click here

    A

  3. READ VALUE USING GTS (MASS AIR FLOW RATE AND ENGINE SPEED)


    1. Connect the GTS to the DLC3.

    2. Start the engine and turn the GTS on.

    3. Enter the following menus: Engine and ECT / Data List / MAF and Engine speed.

    4. Read the value.

      Standard
      Engine speed MAF
      0 rpm 0.5 gm/sec or less
      550 to 650 rpm 100 gm/sec or less
      3000 rpm 1 gm/sec or more

    NG

    CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) Click here

    OK

  4. REPLACE MASS AIR FLOW METER


    1. Replace the mass air flow meter Click here.

      Tech Tips

      If foreign matter is stuck inside the mass air flow meter, the output characteristics of the mass air flow meter may change, resulting in a malfunction.


    NEXT

  5. CHECK DTC OUTPUT


    1. Connect the GTS to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the engine switch off for 30 seconds or more.

    4. Start the engine.

    5. After the engine is completely warmed up, perform the following procedure 3 times with the A/C off: from a vehicle speed of 60 km/h (37 mph), accelerate the vehicle to 80 km/h (50 mph), quickly release the accelerator pedal and do not depress it for 7 seconds or more.

    6. Stop the vehicle immediately after completing the above procedure.

    7. Connect the GTS to the DLC3.

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

    9. Read the pending DTCs.

      Tech Tips


      • If no pending DTCs are output, proceed to the next step to check "All Readiness".

      • Perform the following procedure using the GTS to determine whether or not the DTC judgment has been carried out.


      1. Enter the following menus: Engine and ECT / Utility / All Readiness.

      2. Input DTC P0101.

      3. Check the DTC judgment result.

        Result
        GTS Display Result Proceed to
        Pending DTC P0101 is output B
        All Readiness NORMAL A
        ABNORMAL B

        Tech Tips

        If STATUS is INCOMPLETE or N/A, perform the following procedure again 3 times with the A/C off: from a vehicle speed of 60 km/h (37 mph), accelerate the vehicle to 80 km/h (50 mph), quickly release the accelerator pedal and do not depress it for 7 seconds or more.


    A

    END

    B

  6. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)


    1. Disconnect the mass air flow meter connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      C3-3 (VG) - C110-119 (VG) Always Below 1 Ω
      C3-2 (E2G) - C110-94 (EVG) Always Below 1 Ω
      C3-3 (VG) or C110-119 (VG) - Body ground Always 10 kΩ or higher

    4. Reconnect the mass air flow meter connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  7. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  8. READ VALUE USING GTS (MASS AIR FLOW RATE AND ENGINE SPEED)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

    3. Enter the following menus: Engine and ECT / Data List / MAF and Engine speed.

    4. Read the value.

      Standard
      Engine speed MAF
      0 rpm 0.35 gm/sec or less

    NG

    CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) Click here

    OK

  9. READ VALUE USING GTS (MAP AND ATMOSPHERIC PRESSURE)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

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

    4. Compare the values when the engine switch is on (IG).

      Standard
      Difference between "MAP" and "Atmosphere Pressure" is less than 8 kPa.

      Tech Tips


      • If "MAP" and "Atmosphere Pressure" have the same value, both are normal. If there is a difference of 8 kPa or more, compare the values to the atmospheric pressure for that day. The sensor whose deviation is the greatest is malfunctioning.

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


    NG

    REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR Click here

    OK

  10. CHECK AIR INDUCTION SYSTEM


    1. Check the air induction system for vacuum leakage Click here.

      OK
      No leakage from air induction system.

      Tech Tips


      • Check for abnormal disconnection, pipe and hose squashing, and any damage in the intake system.

      • Using your hand, check whether the pipes and hoses in the intake system are securely connected.

      • Air leaks from the intake system can be checked by applying soapy water and revving the engine.

      • Check for any modifications in the intake system made by the user.


    NG

    REPAIR OR REPLACE AIR INDUCTION SYSTEM Click here

    OK

  11. READ VALUE USING GTS (INTAKE AIR AND INTAKE AIR TEMP (TURBO))


    1. Connect the GTS to the DLC3.

    2. Soak the engine for a long time.

    3. Turn the engine switch on (IG) and turn the GTS on.

    4. Enter the following menus: Engine and ECT / Data List / Intake Air and Intake Air Temp (Turbo).

      OK
      Intake Air is the same as Intake Air Temp (Turbo).

    NG

    INSPECT INTAKE AIR TEMPERATURE SENSOR (TURBO) Click here

    OK

  12. INSPECT EGR VALVE ASSEMBLY


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

    3. Enter the following menus: Engine and ECT / Active Test / Control the EGR Step Position or Control the EGR Step Position #2.

    4. While continuously changing the Active Test value to 0, 30, 60, 90, 60, 30 and 0%, check that Actual EGR Valve Pos or Actual EGR Valve Pos #2 smoothly changes to the set opening lift amount.

      OK
      Value smoothly changes to within +/- 10% of set opening lift amount.

      Tech Tips


      • EGR valve closed: 0%.

      • EGR valve open: 95.2%.

    5. Next, after the engine is warmed up, stop the engine and wait for 15 seconds. After that, start the engine again and idle it for 30 seconds. Then stop the engine and wait for 15 seconds. After starting the engine again, read the Data List values while idling.

    6. Enter the following menus: Data List / EGR Close Lrn. Val. or EGR Close Lrn. Val. #2.

    7. Read the values.

      Standard
      3.5 to 4.5 V

    NG

    CHECK FOR DEPOSIT (EGR VALVE ASSEMBLY) Click here

    OK

  13. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)


    1. Disconnect the mass air flow meter connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      C3-3 (VG) - C110-119 (VG) Always Below 1 Ω
      C3-2 (E2G) - C110-94 (EVG) Always Below 1 Ω
      C3-3 (VG) or C110-119 (VG) - Body ground Always 10 kΩ or higher

    4. Reconnect the mass air flow meter connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  14. REPLACE MASS AIR FLOW METER


    1. Replace the mass air flow meter Click here.

      Tech Tips

      If foreign matter is stuck inside the mass air flow meter, the output characteristics of the mass air flow meter may change, resulting in a malfunction.


    NEXT

  15. CHECK DTC OUTPUT


    1. Connect the GTS to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the engine switch off for 30 seconds or more.

    4. Start the engine.

    5. After the engine is completely warmed up, perform the following procedure 3 times with the A/C off: from a vehicle speed of 60 km/h (37 mph), accelerate the vehicle to 80 km/h (50 mph), quickly release the accelerator pedal and do not depress it for 7 seconds or more.

    6. Stop the vehicle immediately after completing the above procedure.

    7. Connect the GTS to the DLC3.

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

    9. Read the pending DTCs.

      Tech Tips


      • If no pending DTCs are output, proceed to the next step to check "All Readiness".

      • Perform the following procedure using the GTS to determine whether or not the DTC judgment has been carried out.


      1. Enter the following menus: Engine and ECT / Utility / All Readiness.

      2. Input DTC P0101.

      3. Check the DTC judgment result.

        Result
        GTS Display Result Proceed to
        Pending DTC P0101 is output B
        All Readiness NORMAL A
        ABNORMAL B

        Tech Tips

        If STATUS is INCOMPLETE or N/A, perform the following procedure again 3 times with the A/C off: from a vehicle speed of 60 km/h (37 mph), accelerate the vehicle to 80 km/h (50 mph), quickly release the accelerator pedal and do not depress it for 7 seconds or more.


    A

    END

    B

    REPLACE ECM Click here

  16. INSPECT INTAKE AIR TEMPERATURE SENSOR (TURBO)


    1. Inspect the intake air temperature sensor (turbo) Click here.


    OK

    REPLACE MASS AIR FLOW METER Click here

    NG

    REPLACE INTAKE AIR TEMPERATURE SENSOR (TURBO) Click here

  17. CHECK FOR DEPOSIT (EGR VALVE ASSEMBLY)


    1. Remove the No. 1 and No. 2 EGR valve assembly Click here.

    2. Visually check the EGR valve assembly for deposits.

      Result
      If there are deposits, clean the EGR valve and EGR passage (intake/exhaust manifold, EGR cooler, EGR pipes, etc.).

      Note


      • When cleaning the EGR valve assembly, make sure the valve is completely closed.

      • When cleaning the EGR valve assembly, perform initialization procedure Click here.

      • Do not forcibly open the valve, as it may be damaged or deformed.

      • When cleaning the EGR valve assembly, use a piece of cloth soaked with cleaning solvent. Spraying the solvent directly onto these parts or soaking the parts in the solvent may damage the parts.

    3. Reinstall the EGR valve assembly Click here.


    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

  18. REPLACE MASS AIR FLOW METER


    1. Replace the mass air flow meter Click here.

      Tech Tips

      If foreign matter is stuck inside the mass air flow meter, the output characteristics of the mass air flow meter may change, resulting in a malfunction.


    NEXT

  19. CHECK DTC OUTPUT


    1. Connect the GTS to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the engine switch off for 30 seconds or more.

    4. Start the engine.

    5. After the engine is completely warmed up, perform the following procedure 3 times with the A/C off: from a vehicle speed of 60 km/h (37 mph), accelerate the vehicle to 80 km/h (50 mph), quickly release the accelerator pedal and do not depress it for 7 seconds or more.

    6. Stop the vehicle immediately after completing the above procedure.

    7. Connect the GTS to the DLC3.

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

    9. Read the pending DTCs.

      Tech Tips


      • If no pending DTCs are output, proceed to the next step to check "All Readiness".

      • Perform the following procedure using the GTS to determine whether or not the DTC judgment has been carried out.


      1. Enter the following menus: Engine and ECT / Utility / All Readiness.

      2. Input DTC P0101.

      3. Check the DTC judgment result.

        Result
        GTS Display Result Proceed to
        Pending DTC P0101 is output B
        All Readiness NORMAL A
        ABNORMAL B

        Tech Tips

        If STATUS is INCOMPLETE or N/A, perform the following procedure again 3 times with the A/C off: from a vehicle speed of 60 km/h (37 mph), accelerate the vehicle to 80 km/h (50 mph), quickly release the accelerator pedal and do not depress it for 7 seconds or more.


    A

    END

    B

    REPLACE ECM Click here

  20. REPAIR OR REPLACE AIR INDUCTION SYSTEM


    1. Repair or replace the air induction system.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  21. REPLACE EGR VALVE ASSEMBLY


    1. Replace the No. 1 or No. 2 EGR valve assembly Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  22. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  23. REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR


    1. Replace the manifold absolute pressure sensor.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  24. REPLACE INTAKE AIR TEMPERATURE SENSOR (TURBO)


    1. Replace the intake air temperature sensor (turbo) Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  25. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  26. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the engine switch off for 30 seconds or more.

    4. Start the engine.

    5. After the engine is completely warmed up, perform the following procedure 3 times with the A/C off: from a vehicle speed of 60 km/h (37 mph), accelerate the vehicle to 80 km/h (50 mph), quickly release the accelerator pedal and do not depress it for 7 seconds or more.

    6. Stop the vehicle immediately after completing the above procedure.

    7. Connect the GTS to the DLC3.

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

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

      Tech Tips

      Perform the following procedure using the GTS to determine whether or not the DTC judgment has been carried out.


      1. Enter the following menus: Engine and ECT / Utility / All Readiness.

      2. Input DTC P0101.

      3. Check the DTC judgment result.

        Tech Tips

        If STATUS is INCOMPLETE or N/A, perform the following procedure again 3 times with the A/C off: from a vehicle speed of 60 km/h (37 mph), accelerate the vehicle to 80 km/h (50 mph), quickly release the accelerator pedal and do not depress it for 7 seconds or more.


    NEXT

    END