ECD SYSTEM, Diagnostic DTC:P2108

DTC Code DTC Name
P2108 Throttle Actuator Control Module Performance

DESCRIPTION

The ECM opens and closes the throttle valve using a DC motor type actuator. With the throttle valve, the exhaust gas recirculation volume can be properly controlled. Also, engine vibration and noise will be reduced by closing the valve when the engine is stopped.

P2108
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
With a warm engine, turn the ignition switch from ON to off and wait for one minute or more to perform the zero point learning operation. Throttle valve learning value is lower or higher than threshold
  • Throttle valve does not move smoothly

  • ECM

Tech Tips


  • If carbon deposits exist in the diesel throttle body assembly, the following parts possibly also have deposits inside: The EGR valve assembly, intake manifold, DPF catalyst, and other parts related to the exhaust gas.

    By removing the EGR valve assembly from the intake manifold, the carbon deposit condition between the EGR valve and intake manifold can be checked visually. When checking the EGR valve assembly, hold the EGR valve to a light and confirm that the valve contacts with the valve seat securely.

    A0118STE01
  • For vehicles with DPF catalyst:

    If the DPF catalyst has become clogged with PM (Particulate Matter) and the value of the "Catalyst Differential Press" is more than 0.4 at an engine speed of 4000 rpm, DTC P2463 (Diesel Particulate Filter Restriction - Soot Accumulation) may be present. If the value of the "Catalyst Differential Press" is about 0.4 or less at an engine speed of 4000 rpm, the catalyst is probably clogged with PM even if DTC P2463 is not present. Check the Catalyst Differential Press by entering the following menus on an intelligent tester: Powertrain / Engine and ECT / Data List / Catalyst Differential Press.

    If the DPF catalyst has become clogged with PM (Particulate Matter) and the value of the "DPF Differential Pressure" is more than 80 kPa, DTC P244B (Diesel Particulate Filter Differential Pressure Too High) may be present. If the value of the "DPF Differential Pressure" is more than 80 kPa, the catalyst is probably clogged with PM even if DTC P244B is not present. Check the DPF Differential Pressure by entering the following menus on an intelligent tester: Powertrain / Engine and ECT / Data List / DPF Differential Pressure.

MONITOR DESCRIPTION

After the engine has warmed up and the ignition switch has been turned off, throttle zero point learning will be performed. If the actual opening angle does not change and the learning value is outside the specified range, a DTC will be stored.

INSPECTION PROCEDURE

Note


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

  • When replacing the ECM, the ECM needs Registration and Initialization Click here.

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the intelligent tester. Then after installing the new ECM, perform all of the initializations/registrations for the "Learning Values Write" function by following the instructions shown on the tester display.

  • Read freeze frame data using the intelligent tester. 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 P2108)


    1. Connect the intelligent tester to the DLC3.

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

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

    4. Read the DTC.

      Result
      Result Proceed to
      DTC P2108 A
      DTC P2108 and other DTCs B

    B
    A
  2. CHECK FOR DEPOSIT (DIESEL THROTTLE BODY ASSEMBLY)


    1. Check for any deposits in the diesel throttle body assembly.

      OK
      No deposits in the diesel throttle body assembly.

      Tech Tips

      If carbon deposits exist in the diesel throttle body assembly, the following parts possibly also have deposits inside: the EGR valve assembly, intake manifold, DPF catalyst, and other parts related to the exhaust gas. By removing the EGR valve assembly from the intake manifold, the carbon deposit condition between the EGR valve and intake manifold can be checked visually. When checking for deposits in the EGR valve assembly, hold the EGR valve to a light and confirm that the valve contacts with the valve seat securely.

    2. If there are deposits, remove the deposits from those parts and clean them.

      Note

      When cleaning the EGR valve or the diesel throttle body, use a piece of cloth. Spraying the solvent directly onto these parts or soaking the parts in the solvent may damage the parts.

      A0117QPE01

    NEXT
  3. INSPECT DIESEL THROTTLE BODY ASSEMBLY (THROTTLE VALVE MOVEMENT)


    1. Using your finger, check that the throttle valve moves smoothly.

      OK
      Throttle valve moves smoothly.
      Result
      Result Proceed to
      NG A
      OK B

      Note

      Take care that you do not damage the throttle valve and the valve housing.


    B
    A
  4. REPLACE DIESEL THROTTLE BODY ASSEMBLY


    1. Replace diesel throttle body assembly Click here.


    NEXT
  5. CHECK WHETHER DTC OUTPUT RECURS


    1. Connect the intelligent tester to the DLC3.

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

    3. Clear the DTCs Click here.

    4. Turn the ignition switch off and wait for 1 minute or more.

    5. Turn the ignition switch to ON.

    6. Enter the following menus: Powertrain / Engine and ECT / DTC.

    7. Read the DTC.

      Result
      Result Proceed to
      DTC P2108 A
      No DTC output B

    B
    A
  6. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT
  7. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

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

    3. Clear the DTCs Click here.

    4. Turn the ignition switch off and wait for 1 minute or more.

    5. Turn the ignition switch to ON.

    6. Enter the following menus: Powertrain / Engine and ECT / DTC.

    7. Confirm that the DTC is not output again.


    NEXT