ECD SYSTEM(w/ Glow Plug Controller), Diagnostic DTC:P0101

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

DESCRIPTION

Refer to DTC P0100.

Click here

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

CAUTION / NOTICE / HINT

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

    Click here

  • 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.

PROCEDURE

  1. 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.

      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.

    B

    GO TO DTC CHART

    A
  2. CHECK CONNECTION OF VACUUM HOSES

    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.

    OK

    The vacuum hoses are appropriately connected to each other.

    Result

    Proceed to

    OK

    NG

    NG

    REPAIR OR REPLACE VACUUM HOSEClick here

    OK
  3. 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.

      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 to 7 gm/sec

      Idling (EGR valve closed)

      7 to 11 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

    NG

    REPLACE MASS AIR FLOW METERClick here

    OK
  4. 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

    NG

    REPAIR OR REPLACE INTAKE AND EXHAUST SYSTEMClick here

    OK
  5. 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.

      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

    NG

    REPLACE DIESEL TURBO PRESSURE SENSORClick here

    OK
  6. 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.

      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 10 to 100%, 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

    NG

    REPLACE DIESEL THROTTLE BODY ASSEMBLYClick here

    OK
  7. 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.

      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

    NG

    REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLYClick here

    OK
  8. REPLACE MASS AIR FLOW METER

    1. Replace the mass air flow meter.

      Click here

    Result

    Proceed to

    NEXT

    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  9. REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY

    1. Replace the electric EGR control valve assembly.

      Click here

    Result

    Proceed to

    NEXT

    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  10. REPLACE DIESEL THROTTLE BODY ASSEMBLY

    1. Replace the diesel throttle body assembly.

      Click hereClick here

    Result

    Proceed to

    NEXT

    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  11. REPLACE DIESEL TURBO PRESSURE SENSOR

    1. Replace the diesel turbo pressure sensor.

      Click hereClick here

    Result

    Proceed to

    NEXT

    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  12. REPAIR OR REPLACE INTAKE AND EXHAUST SYSTEM

    Result

    Proceed to

    NEXT

    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  13. REPAIR OR REPLACE VACUUM HOSE

    Result

    Proceed to

    NEXT

    NEXT
  14. 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. 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.

      Powertrain > Engine and ECT > Trouble Codes

    Result

    Proceed to

    NEXT

    NEXT

    END