ECD SYSTEM, Diagnostic DTC:P0101

DTC Code DTC Name
P0101 Mass or Volume Air Flow Sensor "A" Circuit Range / Performance

DESCRIPTION

Refer to DTC P0102.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0101 Mass or Volume Air Flow Sensor "A" Circuit Range / Performance

When difference between mass air flow meter sub-assembly reading and estimated MAF exceeds threshold.

(3 trip detection logic)

  • Open or short in mass air flow meter sub-assembly circuit

  • Mass air flow meter sub-assembly

  • Intake air temperature sensor

  • Intake air duct

  • Air cleaner filter element sub-assembly

  • EGR valve assembly

  • Diesel throttle body assembly

  • Coking in intake ports and intake valves

  • Swirl control valve

  • ECM

 Comes on DTC stored
Related Data List
DTC No. Data List
P0101

  • Intake Air

  • Intake Air Temp (Turbo)

WIRING DIAGRAM

Refer to DTC P0102.

Click here

CAUTION / NOTICE / HINT

Note


  • When replacing the ECM, the ECM needs registration and initialization.

    Click here

  • After replacing the mass air flow meter sub-assembly, the ECM needs initialization.

    Click here

  • After replacing the swirl control valve, the ECM needs initialization.

    Click here

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

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning V alues Save" function using the GTS. Then after installing the new ECM, perform all of the initialization/registrations 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.

PROCEDURE


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


    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 / Intake Air and Intake Air Temp (Turbo).


      Powertrain > Engine and ECT > Data List
      Tester Display
      Intake Air
      Intake Air Temp (Turbo)

    4. Start the engine and wait 30 seconds.

    5. Read the value.

      OK
      Difference between Intake Air and Intake Air Temp (Turbo) is 25°C (45°F) or less.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INTAKE AIR TEMPERATURE SENSOR Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)


    1. Disconnect the mass air flow meter sub-assembly 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
      B221-5 (VG) - B220-97 (VG) Always Below 1 Ω
      B221-4 (VGR) - B220-98 (VGR) Always Below 1 Ω
      B221-2 (E2G) - B220-129 (EVG) Always Below 1 Ω
      B221-5 (VG) or B220-97 (VG) - Body ground Always 10 kΩ or higher
      B221-4 (VGR) or B220-98 (VGR) - Body ground Always 10 kΩ or higher
      B221-2 (E2G) or B220-129 (EVG) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 19 Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    A0030ZEC02
    *a

    Front view of wire harness connector

    (to Mass Air Flow Meter Sub-assembly)

    1. Disconnect the mass air flow meter sub-assembly connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C221-1 (+B) - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - EFI MAIN RELAY OR ECM POWER SOURCE CIRCUIT) Click here

    OK

  4. CHECK INTAKE SYSTEM


    1. Start the engine.

    2. Check air duct between intake silencer, mass air flow meter sub-assembly and turbocharger for leaks.

    3. Check air duct between turbocharger and intake manifold for leaks.

      Tech Tips


      • Oily patches are signs of leaks.

      • Check whether sealing rings on charge air hoses are rolled back or missing.

      OK
      No leakage.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE INTAKE SYSTEM Click here

    OK

  5. CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY


    1. Inspect the air cleaner filter element sub-assembly.

      OK
      No blockage in air cleaner filter element sub-assembly.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY Click here

    OK

  6. CHECK EGR VALVE ASSEMBLY


    1. Check that the there is no catching in the EGR valve assembly and installed parts have not been excessively tightened.

    2. Check for DTCs related to the EGR valve assembly.

      OK
      There is no catching in the EGR valve assembly, installed parts have not been excessively tightened and no DTCs are stored.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE EGR VALVE ASSEMBLY Click here

    OK

  7. CHECK SWIRL CONTROL VALVE


    1. Check operation of swirl flaps and fault code memory entries.

      OK
      DTCs are not stored and function operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SWIRL CONTROL VALVE Click here

    OK

  8. CHECK DIESEL THROTTLE BODY ASSEMBLY


    1. Check for DTCs related to the diesel throttle body assembly function.

      OK
      DTCs are not stored and function operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE DIESEL THROTTLE BODY ASSEMBLY Click here

    OK

  9. CHECK INTAKE PORT AND INTAKE VALVES


    1. Check intake ports and intake valves for coking.

      Tech Tips

      Excessive oil loss from crankcase ventilation system can cause coking, especially when in the case of short-distance driving.

      OK
      Intake ports and intake valves are not coked.
      Result
      Proceed to
      OK
      NG

    NG

    CLEAN INTAKE PORT AND INTAKE VALVES Click here

    OK

  10. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY


    1. Replace the mass air flow meter sub-assembly.

      Click here

    2. Perform the mass air flow meter sub-assembly learning value reset.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  11. 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.


      Powertrain > Engine and ECT > Clear DTCs

    4. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

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


      Powertrain > Engine and ECT > Trouble Codes

    8. Read the DTCs.

      Result
      Result Proceed to
      No DTC output A
      DTC P0101 B

    A

    END

    B

  12. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 21 Click here

  13. CLEAN INTAKE PORT AND INTAKE VALVES


    1. Clean coke from the intake ports and intake valves.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 21 Click here

  14. REPAIR OR REPLACE DIESEL THROTTLE BODY ASSEMBLY


    1. Repair or replace diesel throttle body assembly or perform inspections and troubleshooting for related DTCs.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 21 Click here

  15. REPLACE SWIRL CONTROL VALVE


    1. Replace the swirl control valve.

      Click here

    2. Perform the swirl valve learning value reset.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 21 Click here

  16. REPAIR OR REPLACE EGR VALVE ASSEMBLY


    1. Repair or replace EGR valve assembly or perform inspections and troubleshooting for related DTCs.

      Click here

      Tech Tips

      When the EGR valve assembly is replaced, perform initialization.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 21 Click here

  17. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY


    1. Replace the air cleaner filter element sub-assembly.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 21 Click here

  18. REPAIR OR REPLACE INTAKE SYSTEM


    1. Repair or replace the malfunctioning parts of the intake system.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 21 Click here

  19. REPAIR OR REPLACE HARNESS OR CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - EFI MAIN RELAY OR ECM POWER SOURCE CIRCUIT)


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 21 Click here

  20. REPLACE INTAKE AIR TEMPERATURE SENSOR


    1. Replace the intake air temperature sensor.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  21. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

    4. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

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


      Powertrain > Engine and ECT > Trouble Codes

    8. Confirm that the DTC is not output again.

      Result
      Proceed to
      NEXT

    NEXT

    END