ECD SYSTEM (w/ DPF), 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 rotary solenoid 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.

P0488
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
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.

Target and actual opening angle of the throttle valve differs for approximately 20 seconds.

(1 trip detection logic)

  • Throttle valve stuck

  • Throttle valve does not move smoothly

  • Open or short in throttle control motor circuit

  • ECM

The throttle motor activation duty exceeds the threshold for 0.5 seconds a certain number of times (40 seconds or more).

(1 trip detection logic)
Related Data List
DTC No. Data List
P0488

  • Throttle Motor Duty #1

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

MONITOR DESCRIPTION

The ECM opens and closes the throttle valve by adjusting the current flowing to the rotary solenoid 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.

A00O9J9E10

WIRING DIAGRAM

A00O442E01

INSPECTION PROCEDURE

Note


  • Inspect the fuses of circuits related to this system before performing the following inspection procedure.

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

  • After replacing the fuel supply pump assembly, the ECM needs initialization Click here.

  • After replacing an injector assembly, the ECM needs registration Click here.

Tech Tips


  • Although the DTC titles say exhaust gas recirculation throttle position control Range / Performance, these DTCs relate to the throttle valve

  • 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. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DIESEL THROTTLE TARGET ANGLE)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the tester on.

    3. Enter the following menus: Powertrain / Engine and ECT / Active Test / Diesel Throttle Target Angle.

    4. When changing the Active Test continuously value to 0, 30, 60, 90, 60, 30 and 0%, check that Actual Throttle Position smoothly changes to the set opening angle.

      OK
      Value smoothly changes to set opening angle.

    OK

    REMOVE DEPOSIT (DIESEL THROTTLE BODY ASSEMBLY) Click here

    NG

    CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR POWER SOURCE) Click here

  2. CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR POWER SOURCE)


    1. A00O47QE09
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Throttle Control Motor)

      Disconnect the throttle control motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C74-2 (B) - Body ground Engine switch on (IG) 11 to 14 V

    3. Reconnect the throttle control motor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (THROTTLE CONTROL MOTOR - BATTERY) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT)


    1. Disconnect the throttle control motor connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      C74-3 (RSC) - Body ground Always Below 1 Ω

    3. Reconnect the throttle control motor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - ECM)


    1. Disconnect the throttle control motor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      C74-1 (RSO) - C92-15 (LUSL) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C74-1 (RSO) or C92-15 (LUSL) - Body ground Always 10 kΩ or higher

    4. Reconnect the throttle control motor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  5. REMOVE DEPOSIT (DIESEL THROTTLE BODY ASSEMBLY)


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


    NEXT

  6. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DIESEL THROTTLE TARGET ANGLE)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the tester on.

    3. Enter the following menus: Powertrain / Engine and ECT / Active Test / Diesel Throttle Target Angle.

    4. When changing the Active Test continuously value to 0, 30, 60, 90, 60, 30 and 0%, check that Actual Throttle Position smoothly changes to the set opening angle.

      OK
      Value smoothly changes to set opening angle.

    OK

    CHECK WHETHER DTC OUTPUT RECURS Click here

    NG

    REPLACE DIESEL THROTTLE BODY ASSEMBLY Click here

  7. REPLACE DIESEL THROTTLE BODY ASSEMBLY


    1. Replace the diesel throttle body assembly Click here.


    NEXT

  8. CHECK WHETHER DTC OUTPUT RECURS


    1. Clear the DTCs Click here.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG) and turn the tester on.

    4. Start the engine.

    5. Over a period of 10 seconds or more, slowly raise the engine speed to 3000 rpm and lower it.

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

    7. Read the DTCs.

      Result
      Result Proceed to
      P0488 is output A
      No DTC is output B

    B

    END

    A

  9. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  10. REPAIR OR REPLACE HARNESS OR CONNECTOR (THROTTLE CONTROL MOTOR - BATTERY)


    1. Repair or replace the harness or connector.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  11. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  12. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the engine switch off.

    4. Start the engine.

    5. Over a period of 10 seconds or more, slowly raise the engine speed to 3000 rpm, and then lower it.

    6. Confirm that the DTC is not output again.

      Tech Tips

      Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.


      1. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

      2. Input DTC P0488.

      3. Check that STATUS is NORMAL. If STATUS is INCOMPLETE or N/A, over a period of 10 seconds or more, slowly raise the engine speed to 3000 rpm again, and then idle the engine for 5 minutes.


    NEXT

    END