ECD SYSTEM(w/ Urea SCR System), Diagnostic DTC:P0488

DTC Code DTC Name
P0488 Exhaust Gas Recirculation Throttle Position Control Range / Performance

DESCRIPTION

The ECM opens and closes the throttle valve using a DC motor type actuator. Due to the opening and closing of the 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.

Although the DTC title says "Exhaust Gas Recirculation Throttle Position Control Range / Performance", this DTC indicates that the throttle valve is malfunctioning.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0488 Exhaust Gas Recirculation Throttle Position Control Range / Performance The throttle actuator activation duty is more than specified value for 60 seconds (1 trip detection logic).
  • Throttle valve stuck

  • Throttle valve does not move smoothly

  • Open or short in throttle actuator circuit

  • ECM

Comes on DTC stored
Related Data List
DTC No. Data List
P0488
  • Target Throttle Position

  • Actual Throttle Position

  • Throttle Motor DUTY

  • Throttle Close Learning Val.

Reference
Condition Throttle Valve Position
Moment when accelerator pedal is depressed further or released at 3000 rpm Throttle valve opening angle varies smoothly

CONFIRMATION DRIVING PATTERN

DTC No. DTC Detection Drive Pattern
P0488

Perform the following repeatedly for 1 minute:

gradually raise the engine speed to 3000 rpm from idling over approximately 10 seconds, and then release the accelerator pedal to return to an idling state.

MONITOR DESCRIPTION

The ECM opens and closes the throttle valve by adjusting the current flowing to the DC motor with a duty ratio. If the throttle valve does not move smoothly or is stuck, the duty ratio used during valve movement control increases or decreases greatly. The ECM will determine that the throttle valve is malfunctioning and illuminate the MIL.

B0024R6E06

WIRING DIAGRAM

Refer to DTC P0122.

Click here

CAUTION / NOTICE / HINT

Note


  • When cleaning the diesel throttle body assembly, 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.

  • After replacing the ECM, the new ECM needs registration (Click here ) and initialization Click here.

Tech Tips

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. 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 / Active Test / Diesel Throttle Target Angle / Primary / Actual Throttle Position.

    4. When changing the Active Test value consecutively to 10, 30, 60, 90, 60, 30 and 10%, check that Actual Throttle Position smoothly changes to the set opening angle.


      Powertrain > Engine > Active Test
      Active Test Display
      Diesel Throttle Target Angle
      Data List Display
      Actual Throttle Position
      OK
      Value smoothly changes to set opening angle.
      Result
      Proceed to
      OK
      NG

    NG
    OK
  2. CHECK FOR DEPOSIT (DIESEL THROTTLE BODY ASSEMBLY)


    1. Visually check for deposits in the diesel throttle body assembly. If there are deposits, clean the diesel throttle body assembly.

      Note


      • When cleaning the diesel throttle body assembly, 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.

      • Extreme care must be taken to prevent the removed deposits from falling into the engine unit during cleaning.

      Result
      Proceed to
      NEXT

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


    1. Using your finger, move the throttle valve from the fully open position to the fully closed position and check that it moves smoothly.

      OK
      Throttle valve moves smoothly.

      Note

      Take care not to damage the throttle valve or valve housing.

      Result
      Proceed to
      OK
      NG

    NG
    OK
  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P0488)


    1. Start the engine and warm it up.

    2. Connect the GTS to the DLC3.

    3. Turn the GTS on.

    4. Take a snapshot with the GTS.

    5. Enter the following menus: Powertrain / Engine / Active Test / Diesel Throttle Target Angle / Primary / Actual Throttle Position.

      Tech Tips

      The movement of the throttle valve can be determined by performing the following inspection.

    6. When changing the Active Test value consecutively to 10, 30, 60, 90, 60, 30 and 10%, check that Actual Throttle Position smoothly changes to the set opening angle.


      Powertrain > Engine > Active Test
      Active Test Display
      Diesel Throttle Target Angle
      Data List Display
      Actual Throttle Position
      OK
      Value smoothly changes to set opening angle.
    7. Perform the following repeatedly for 1 minute: gradually raise the engine speed to 3000 rpm from an idling over approximately 10 seconds, and then release the accelerator pedal to return to an idling state.

    8. Enter the following menus: Powertrain / Engine / Trouble Codes.

    9. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      OK
      DTC is not output.
      Result
      Proceed to
      OK
      NG

    OK
    NG
  5. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT
  6. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Start the engine and warm it up.

    2. Connect the GTS to the DLC3.

    3. Turn the GTS on.

    4. Take a snapshot with the GTS.

    5. Enter the following menus: Powertrain / Engine / Active Test / Diesel Throttle Target Angle / Primary / Actual Throttle Position.


      Powertrain > Engine > Active Test
      Active Test Display
      Diesel Throttle Target Angle
      Data List Display
      Actual Throttle Position

      Tech Tips

      The movement of the throttle valve can be determined by performing the following inspection.

    6. When changing the Active Test value consecutively to 10, 30, 60, 90, 60, 30 and 10%, check that Actual Throttle Position smoothly changes to the set opening angle.

      OK
      Value smoothly changes to set opening angle.
    7. Perform the following repeatedly for 1 minute: gradually raise the engine speed to 3000 rpm from an idling over approximately 10 seconds, and then release the accelerator pedal to return to an idling state.

    8. Enter the following menus: Powertrain / Engine / Trouble Codes.

    9. Confirm that the DTC is not output.


      Powertrain > Engine > Trouble Codes
      Result
      Proceed to
      NEXT

    NEXT
  7. REPLACE DIESEL THROTTLE BODY ASSEMBLY


    1. Replace the diesel throttle body assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT
  8. CHECK FOR DEPOSIT (DIESEL THROTTLE BODY ASSEMBLY)


    1. Visually check for deposits in the diesel throttle body assembly. If there are deposits, clean the diesel throttle body assembly.

      Note


      • When cleaning the diesel throttle body assembly, 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.

      • Extreme care must be taken to prevent the removed deposits from falling into the engine unit during cleaning.

      Result
      Proceed to
      NEXT

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


    1. Using your finger, move the throttle valve from the fully open position to the fully closed position and check that it moves smoothly.

      OK
      Throttle valve moves smoothly.

      Note

      Take care not to damage the throttle valve or valve housing.

      Result
      Proceed to
      OK
      NG

    NG
    OK
  10. CHECK HARNESS AND CONNECTOR (DIESEL THROTTLE BODY ASSEMBLY - ECM)


    1. Disconnect the diesel throttle body 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
      Y1-5 (VC) - C59-29 (VCVL) Always Below 1 Ω
      Y1-6 (VTA) - C59-21 (VLU) Always Below 1 Ω
      Y1-3 (E2) - C59-20 (EVLU) Always Below 1 Ω
      Y1-2 (M+) - C60-6 (M+) Always Below 1 Ω
      Y1-1 (M-) - C60-5 (M-) Always Below 1 Ω
      Y1-5 (VC) or C59-29 (VCVL) - Body ground and other terminals Always 10 kΩ or higher
      Y1-6 (VTA) or C59-21 (VLU) - Body ground and other terminals Always 10 kΩ or higher
      Y1-3 (E2) or C59-20 (EVLU) - Body ground and other terminals Always 10 kΩ or higher
      Y1-2 (M+) or C60-6 (M+) - Body ground and other terminals Always 10 kΩ or higher
      Y1-1 (M-) or C60-5 (M-) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK
    NG
  11. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT