2008 Lexus RX 400h FWDFACTORY OEM SERVICE PROCEDURE

Check Mode Procedure

HINT:

Techstream only:

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 (Included in HV control ECU) is changed from normal mode to check mode or vice versa; or 2) the ignition switch is turned from ON to ACC or off while in check mode. Before changing modes, always check and make a note of any DTCs and freeze frame data.
  1. CHECK MODE PROCEDURE (Using Techstream) 
    1. Check and ensure the following conditions:
      1. Battery positive voltage 11 V or more.
      2. Throttle valve fully closed.
      3. Transmission in the P or N position.
      4. A/C switched OFF.
    2. Turn the ignition switch off.
    3. Connect Techstream to the DLC3.
    4. Turn the ignition switch to the ON position.
    5. Turn the tester ON.
    6. Enter the following menus: Powertrain / Engine and ECT / Utility / Check Mode.
    7. Switch the ECM (Included in HV control ECU) from normal mode to check mode.
    8. Make sure the MIL flashes as shown in the illustration.
    9. Start the engine.
    10. Make sure that the MIL turns OFF.
    11. Simulate the conditions of the malfunction described by the customer.
    12. Check the DTCs and freeze frame data using the tester.
      Fig 1: Identifying MIL Flashes
      G04828037Courtesy 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.

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