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Home >> Toyota >> 2018 >> Highlander LE Plus, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 110 (SFI System (2GR-FXS) - Diagnostic Codes - (Hybrid) (4 Of 4)) >> SFI System >> DTC P0128: Thermostat [11/2016 - ] >> Confirmation Driving Pattern

Confirmation Driving Pattern

WARNING: This page is about a different variant/trim than selected.
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  1. Turn the power switch off and leave the vehicle for several hours.
  2. Connect the Techstream to the DLC3.
  3. Turn the power switch on (IG) and turn the Techstream on [A].
  4. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp and Intake Air.
  5. 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" is between 0 and 35°C (32 and 95°F).
  6. Put the engine in INSPECTION MODE (maintenance mode).
  7. Set the heater to MAX HOT with fresh air mode selected and turn the A/C off.
  8. Start the engine.
  9. With the engine running, drive the vehicle at 80 km/h (50 mph) for 15 minutes [B].
    WARNING:

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

    HINT: 

    If the engine stops, further depress the accelerator pedal to restart the engine.

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

    HINT: 

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