2008 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

Check Mode Procedure

  1. DESCRIPTION 
    1. Check mode has a higher sensitivity to malfunctions and can detect malfunctions that normal mode cannot detect. Check mode can also detect all the malfunctions that normal mode can detect. In check mode, DTCs are detected with 1 trip detection logic.
  2. CHECK MODE PROCEDURE 
    1. Make sure that the following conditions are met:
      1. Battery positive voltage 11 V or more
      2. Throttle valve fully closed
      3. Transmission in the P or N position
      4. A/C OFF
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to ON.
    4. Turn the Techstream on.
    5. Enter the following menus: Powertrain / Engine and ECT / Utility / Check Mode.
    6. Change the ECM to check mode. Make sure the MIL flashes as shown in the illustration.
      NOTE: All DTCs and freeze frame data will be erased if: 1) The Techstream is used to change the ECM from normal mode to check mode or vice versa; or 2) during check mode, the ignition switch is turned from ON (IG) to ON (ACC) or OFF.
      Before check mode, make notes of the DTCs and freeze frame data.
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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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