LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2017 >> RC 350 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (2GR-FSE) - Diagnostic Codes (2 Of 5) >> SFI System >> DTC P0128: Thermostat [09/2014 - 11/2017] >> Confirmation Driving Pattern
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Confirmation Driving Pattern

GTY374505Courtesy 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) and turn the Techstream on [A].
  4. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp and Intake Air.
  5. Check that "Coolant Temp" is 56°C (133°F) or less and "Intake Air" is between 0 and 35°C (32 and 95°F).
  6. Set the heater to MAX HOT with fresh air mode selected and turn the A/C off.
  7. Start the engine and 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: 

    • Data can be captured relatively easily by using the snapshot function in the Data List.
    • Enter the following menus: Data List / Function / Snapshot Configure / Duration / 5 min.
    • Data capture can be started by using the target point function. For example, setting the target point to an engine speed of 4000 rpm and then racing the engine, etc. to raise the engine speed to a speed of 4000 rpm or higher will cause data capture to start.
  8. After "Coolant Temp" stabilizes, check that "Coolant Temp" is 75°C (167°F) or higher [C].

    HINT: 

    If "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.