SFI SYSTEM, Diagnostic DTC:P0638

DTC Code DTC Name
P0638 Throttle Actuator Control Range / Performance Bank 1

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0638 Throttle Actuator Control Range / Performance Bank 1

DTC Detection Condition


    Enable Criteria (1)

  • Engine running

  • Delte throttle position timer expired


    Enable Criteria (2)

  • Engine running

  • External torque requests none


    Malfunction Criteria (1)

  • Throttle position error. Absolute (Measured throttle position - predicted throttle position) 3% or higher


    Malfunction Criteria (2)

  • Throttle position error. Absolute (Measured throttle position - predicted throttle position) 10% or higher


    Diagnostic Mask

  • The MIL will be illuminated if fault is present


    Monitor

  • Continuous


    Potential failure modes

  • Blocked throttle body

  • Damage to throttle actuator

  • Cooling fan system

  • ECM

 Come on DTC stored

MONITOR DESCRIPTION

The single throttle butterfly valve mounted at the inlet to the intake plenum is operated by a stepper motor under the command of the engine ECU. The valve moves through a range of nearly 90°and should display 100% at full throttle and around 2% at idle.

CAUTION / NOTICE / HINT

Note

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 GTS. Then after installing the new ECM, perform all of the initialization/registrations 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 P0638)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P0638 is output A
      DTC P0638 and other DTCs are output B

      Tech Tips

      If any DTCs other than P0638 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. READ FREEZE FRAME DATA


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Using the GTS, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  3. REMOVE FOREIGN MATTER (CLEAN THROTTLE BODY WITH MOTOR ASSEMBLY)


    1. Clean off any deposits from the inside of the throttle body assembly.

      B00463YC01
      *1 Throttle Body with Motor Assembly *2 Bore
      *3 Valve - -
      *a Reference *b Throttle Body with Motor Assembly Cross-section Diagram
      *c When valve fully opened *d Do not directly apply cleaner
      *e Deposits - -

      1. Push open the throttle valve and wipe off any carbon from the valve and bore using a piece of cloth soaked in non-residue solvent.

      Note


      • Make sure that the cloth or your fingers do not get caught in the valve.

      • Make sure that foreign matter does not enter the throttle valve.

      • Do not directly apply non-residue solvent to the throttle body with motor assembly or wash the throttle body with motor assembly. Cleaning solvent may leak into the motor from the shaft and cause problems such as rust or valve movement problems.

      • If there is coating material on the edge of the valve, be careful not to remove it.

      • Push the throttle valve open gently with your finger and check that the throttle valve moves smoothly.

      Tech Tips


      • If the throttle valve does not move smoothly, replace the throttle body with motor assembly.

      • Perform "Inspection After Repair" after cleaning the throttle body with motor assembly.

        Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK WHETHER DTC OUTPUT RECURS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.

    5. Turn the engine switch off and wait for at least 30 seconds.

    6. Turn the engine switch on (IG).

    7. Turn the GTS on.

    8. Start the engine.

    9. Warm up the engine.

    10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

    11. Input the DTC: P0638,.

    12. Check the DTC judgment result.

      Tech Tips

      Perform "Inspection After Repair" after replacing the throttle body with motor assembly.

      Click here

      Result
      Result Proceed to

      NORMAL

      (DTCs are not output)

      		 A

      ABNORMAL

      (DTC P0638 is output)

      		 B

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY Click here