2009 Lexus LS 460 RWDFACTORY OEM SERVICE PROCEDURE

Check Mode Procedure

HINT:

Techstream:

Compared to the normal mode, check mode is more sensitive to malfunctions. Therefore, check mode can detect the malfunctions that cannot be detected in normal mode.

NOTE: All the stored DTCs and freeze frame data are erased if: 1) the ECM is changed from normal mode to check mode or vice versa; or 2) the engine switch is turned from on (IG) to on (ACC) or off while in check mode. Before changing modes, always check and note any DTCs and freeze frame data.
  1. CHECK MODE PROCEDURE 
    1. Check and ensure the following condition:
      1. Battery positive voltage 11 V or more.
      2. Throttle valve fully closed.
      3. Transmission in the P or N position.
      4. A/C switch OFF.
    2. Turn the engine switch off.
    3. Connect the Techstream to the DLC3.
    4. Turn the engine switch on (IG).
    5. Turn the Techstream ON.
    6. Enter the following menus: Powertrain/Engine/Utility/Check Mode.
    7. Switch the ECM from normal mode to check mode.
    8. Make sure the MIL flashes as shown in the illustration.
    9. Start the engine.
    10. Make sure the MIL turns OFF.
    11. Simulate the conditions of the malfunction described by the customer.
    12. Check DTCs and freeze frame data using the Techstream.
    Fig 1: Identifying MIL Flashes
    G06189773Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.