ECD 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

Internal error in diesel throttle body assembly output side for 0.22 seconds.

(3 trip detection logic)

  • Cooling fan system

  • ECM

Does not come on

DTC stored

CAUTION / NOTICE / HINT

Note:

When replacing the ECM, the ECM needs registration and initialization.

Click here

Tip:

  • 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. PERFORM ACTIVE TEST USING GTS (ACTUATOR TEST OF FAN HIGH SPEED AND LOW SPEED)

    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 / Active Test / Actuator Test of Fan High Speed and Actuator Test of Fan Low Speed.

      Powertrain > Engine and ECT > Active Test

      Tester Display

      Actuator Test of Fan High Speed

      Powertrain > Engine and ECT > Active Test

      Tester Display

      Actuator Test of Fan Low Speed

      OK

      Cooling fan operates according to operation.

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE COOLING FAN SYSTEMClick here

    OK

  2. REPLACE ECM

    1. Replace the ECM.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  3. REPAIR OR REPLACE COOLING FAN SYSTEM

    1. Repair or replace the cooling fan system.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  4. 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 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

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

      Powertrain > Engine and ECT > Trouble Codes

    8. Confirm that the DTC is not output again.

    Result

    Proceed to

    NEXT
    NEXT

    END