ECD SYSTEM(w/ Glow Plug Controller), 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.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P2108 Throttle Actuator Control Module Performance

Throttle valve learning value is lower or higher than threshold

(1 trip detection logic)

  • Throttle valve does not move smoothly

  • ECM

 - DTC stored
DTC Detection Drive Pattern
DTC No. DTC Detection Drive Pattern
P2108 With a warm engine, turn the ignition switch from ON to off and wait for 1 minute or more to perform the zero point learning operation.

Tech Tips


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

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

    B0044RXC01
    *1 EGR Pipe Connector *2 Electric EGR Control Valve Assembly
    *3 Intake Air Connector *4 No. 2 EGR Valve Assembly
    *5 EGR with Cooler Pipe Assembly - -

  • If the DPF catalyst has become clogged with PM (Particulate Matter) and the value of the "PM Accumulation Ratio" is more than 167% at an engine speed of 4000 rpm, DTC P2463 (Diesel Particulate Filter Restriction - Soot Accumulation) may be present. If the value of the "PM Accumulation Ratio" is about 167% 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 PM Accumulation Ratio by entering the following menus on the GTS: Powertrain / Engine and ECT / Data List / PM Accumulation Ratio.

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.

CAUTION / NOTICE / HINT

Note


  • When cleaning the electric EGR control valve assembly or the diesel throttle body assembly, 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, perform ECM Initialization and Registration.

    Click here

Tech Tips


  • 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 P2108)


    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 P2108 is output A
      DTC P2108 and other DTCs are output B

      Tech Tips

      If any DTCs other than DTC P2108 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    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 may also have deposits inside: electric EGR control valve assembly, intake manifold, DPF catalyst, other parts related to the exhaust gas. By removing the electric EGR control valve assembly from the intake manifold, deposit between the electric EGR control valve assembly and intake manifold can be checked for visually. When checking for deposits in the electric EGR control valve assembly, hold the electric EGR control valve assembly 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 electric EGR control valve assembly or the diesel throttle body, make sure the valve is completely closed.

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

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

      B0044EOC01
      *1 Electric EGR Control Valve Assembly *2 Diesel Throttle Body Assembly
      *3 Intake Air Connector - -
      Result
      Proceed to
      NEXT

    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
      Proceed to
      OK
      NG

      Note

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


    OK

    GO TO STEP 5 Click here

    NG

  4. REPLACE DIESEL THROTTLE BODY ASSEMBLY


    1. Replace the diesel throttle body assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. CHECK WHETHER DTC OUTPUT RECURS


    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 1 minute or more.

    5. Turn the ignition switch to ON.

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

    7. Read the DTCs.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Result Proceed to
      DTC P2108 is output A
      DTC is not output B

    B

    END

    A

  6. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  7. 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 1 minute or more.

    5. Turn the ignition switch to ON.

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

    7. Confirm that the DTC is not output again.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Proceed to
      NEXT

    NEXT

    END