ECD SYSTEM, Diagnostic DTC:P0488/15

DTC Code DTC Name
P0488/15 Exhaust Gas Recirculation Throttle Position Control Range / Performance

DESCRIPTION

The ECM opens and closes the throttle valve using the rotary solenoid type actuator. Upon opening and closing the valve, the exhaust gas recirculation volume is properly controlled. Also, engine vibration and noise will be reduced by closing the valve when the engine is stopped.

DTC No. DTC Detection Condition Trouble Area
P0488/15

  • When throttle valve remains closed despite ECM's signal to open valve

    (1 trip detection logic)

  • When throttle valve remains open despite ECM's signal to close valve

    (1 trip detection logic)

  • Throttle valve stuck

  • Throttle valve does not move smoothly

  • Open or short in throttle valve circuit

  • Open or short in throttle valve position sensor circuit

  • Throttle position sensor (built in diesel throttle body assy)

  • ECM

Tech Tips

After confirming DTC P0488/15, check the throttle position.

Reference
Condition Throttle Valve Position
Moment when accelerator pedal is further depressed or released at 3,000 rpm Opening angle varies smoothly

MONITOR DESCRIPTION

The ECM opens and closes the throttle valve by adjusting duration of current flowing to the rotary solenoid with the duty ratio. If the throttle valve does not move smoothly or is stuck, the duty ratio during the valve movement control increases or decreases greatly, and the ECM will determine that the throttle valve has a malfunction and illuminates the MIL.

A01BFBRE02

WIRING DIAGRAM

A01BCN0E01

INSPECTION PROCEDURE

Note

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

Tech Tips


  • Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.

  • After warming up the engine, DTC P0488/15 is set 1 second or more after quickly accelerating the engine from idling.

PROCEDURE


  1. CHECK OTHER DTC OUTPUT (IN ADDITION TO P0488/15)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON and turn the intelligent tester ON.

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

    4. Read the DTCs.

      Result
      Display (DTC Output) Proceed to
      P0488/15 A
      P0488/15 and P0120/41, P0122/41 and/or P0123/41 B

      Tech Tips

      If any other codes besides P0488/15 are output, perform troubleshooting for those DTCs first.


    B

    GO TO DTC CHART

    A

  2. CHECK IF DTC OUTPUT RECURS


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON and turn the intelligent tester ON.

    3. Enter the following menus: Powertrain / Engine / DTC / Clear.

    4. Clear the DTCs Click here.

    5. Start the engine and perform a quick engine acceleration from idling to 3,000 rpm 3 times.

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

    7. Read the DTCs.

      Result
      Display (DTC output) Proceed to
      P0488/15 A
      No output B

      Tech Tips

      The normal operation of the throttle valve is as follows.

      Reference
      Condition Throttle Valve Position
      Moment when accelerator pedal is further depressed or released at 3,000 rpm Opening angle varies smoothly

    B

    CHECK FOR INTERMITTENT PROBLEMS

    A

  3. CHECK ECM TERMINAL VOLTAGE (LUSL TERMINAL)


    1. A01BFJLE01

      While revving the engine, check the waveform of the ECM connector using an oscilloscope.

      Standard
      Tester Connection Specified Condition
      D3-4 (LUSL) - D3-7 (E1) Correct waveform is shown
      Tool Setting 1 V/DIV., 2 msec./DIV.
      Condition Warm engine with racing engine

      Tech Tips

      The waveform varies depending on the diesel throttle signal operation.


    NG

    REPLACE ECM

    OK

  4. CHECK HARNESS AND CONNECTOR


    1. A01BHIRE01

      Disconnect the D48 motor connector.

    2. Disconnect the D3 ECM connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition
      D48-1 (DUTY) - D3-4 (LUSL) Below 1 Ω
      D48-1 (DUTY) or D3-4 (LUSL) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE DIESEL THROTTLE BODY ASSEMBLY