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Home >> Lexus >> 2021 >> RC F Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (2 Of 9) >> SFI System >> DTC P0128: Thermostat [03/2019 - ] >> Confirmation Driving Pattern

Confirmation Driving Pattern

GTY819928Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Stop the engine and allow it to soak.
  2. Connect the Techstream to the DLC3.
  3. Turn the engine switch on (IG) [A].
  4. Turn the Techstream on.
  5. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp and Intake Air.
  6. Check that the value of the Data List item Coolant Temp is 56°C (133°F) or less and the value of the Data List item Intake Air Temperature is between 0 and 35°C (32 and 95°F).
  7. Set the heater control to MAX HOT with fresh air mode selected and turn the A/C off.
  8. Start the engine and drive the vehicle at 80 km/h (50 mph) or more for 20 minutes [B].
    WARNING:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

  9. After the value of the Data List item Coolant Temperature stabilizes, check that it is 75°C (167°F) or higher.

    HINT: 

    If the value of the Data List item Coolant Temperature is less than 75°C (167°F) while driving the vehicle at 80 km/h (50 mph), inspect the cooling system and thermostat.

  10. Enter the following menus: Powertrain / Engine / Trouble Codes [C].
  11. Read the pending DTCs.

    HINT: 

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  13. Input the DTC: P0128.
  14. Check the DTC judgment result.
    Techstream Display Description
    NORMAL
    • DTC judgment completed
    • System normal
    ABNORMAL
    • DTC judgment completed
    • System abnormal
    INCOMPLETE
    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions
    N/A
    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT: 

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system has a malfunction.
    • If the judgment result is INCOMPLETE or N/A, If the judgment result is INCOMPLETE, perform steps [D] through [G].
  15. With the engine stopped, leave the vehicle outside overnight [D].
  16. Turn the engine switch on (IG) [E].
  17. Turn the Techstream on.
  18. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
  19. Check that the value of the Data List item Coolant Temp is 25°C (77°F) or less.
  20. Start the engine and drive the vehicle at 90 km/h (56 mph) or more for 20 minutes [F].
    WARNING:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

  21. Enter the following menus: Powertrain / Engine / Trouble Codes [G].
  22. Read the pending DTCs.

    HINT: 

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  23. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  24. Input the DTC: P0128.
  25. Check the DTC judgment result again.
    Techstream Display Description
    NORMAL
    • DTC judgment completed
    • System normal
    ABNORMAL
    • DTC judgment completed
    • System abnormal
    INCOMPLETE
    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions
    N/A
    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT: 

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform the following procedure.
  26. Perform a universal trip and check for permanent DTCs.

    Refer to DTC CHECK / CLEAR [09/2014 - ]

    HINT: 

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.