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. DTC Detection Condition Trouble Area
P0101

When difference between mass air flow meter reading and estimated MAF exceeds threshold

(3 trip detection logic)

  • Open or short in mass air flow meter circuit

  • Mass air flow meter

  • Intake air temperature sensor

  • Intake air duct

  • Air cleaner element assembly

  • EGR valve assembly

  • Diesel throttle body assembly

  • Coking in intake ports and intake valves

  • Swirl control valve

  • ECM
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, 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 Values 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).

    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.

    NG

    REPLACE INTAKE AIR TEMPERATURE SENSOR Click here

    OK

  2. 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
      B92-5 (VG) - B91-97 (VG) Always Below 1 Ω
      B92-4 (VGR) - B91-98 (VGR) Always Below 1 Ω
      B92-2 (E2G) - B91-129 (EVG) Always Below 1 Ω
      B92-5 (VG) or B91-97 (VG) - Body ground Always 10 kΩ or higher
      B92-4 (VGR) or B91-98 (VGR) - Body ground Always 10 kΩ or higher
      B92-2 (E2G) or B91-129 (EVG) - Body ground Always 10 kΩ or higher

    NG

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

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE)


    1. A004OBOE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to mass air flow meter)

      Disconnect the mass air flow meter connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B92-1 (+B) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (MASS AIR FLOW METER - 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 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.

    NG

    REPAIR OR REPLACE INTAKE SYSTEM Click here

    OK

  5. CHECK AIR CLEANER ELEMENT ASSEMBLY


    1. Inspect the air cleaner element assembly.

      OK
      No blockage in air cleaner element assembly.

    NG

    REPLACE AIR FILTER 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.

    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.

    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.

    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.

    NG

    CLEAN INTAKE PORT AND INTAKE VALVES Click here

    OK

  10. REPLACE MASS AIR FLOW METER


    1. Replace the mass air flow meter Click here.

    2. Perform the air flow meter learning value reset Click here.


    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 Click here.

    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.

    8. Read DTCs.

      Result
      Result Proceed to
      No DTC output A
      DTC P0101 B

      Tech Tips

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


    A

    END

    B

    REPLACE ECM Click here

  12. REPLACE INTAKE AIR TEMPERATURE SENSOR


    1. Replace the intake air temperature sensor Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

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


    1. Repair or replace the harness or connector.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  14. REPAIR OR REPLACE INTAKE SYSTEM


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


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  15. REPLACE AIR FILTER


    1. Replace the air filter.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED 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.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  17. REPLACE SWIRL CONTROL VALVE


    1. Replace the swirl control valve Click here.

    2. Perform the swirl valve learning value reset Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  18. 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.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  19. CLEAN INTAKE PORT AND INTAKE VALVES


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


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  20. REPLACE ECM


    1. Replace the ECM Click here.


    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 Click here.

    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.

    8. Confirm that the DTC is not output again.


    NEXT

    END