2006 Lexus GS 430FACTORY OEM SERVICE PROCEDURE

Check Mode Procedure

HINT:

Intelligent tester only:

Compared to the normal mode, check mode is more sensitive to malfunctions. Therefore, check mode can detect the malfunctions that cannot be detected by 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 make a note of any DTCs and freeze frame data.
  1. CHECK MODE PROCEDURE (Using the intelligent tester) 
    1. Check and ensure the following conditions:
      1. Positive (+) battery voltage of 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 intelligent tester to the DLC3.
    4. Turn the engine switch on (ACC).
    5. Turn the tester ON.
    6. Enter the following menus items: DIAGNOSIS / ENHANCED OBD ll / CHECK MODE.
    7. Switch the ECM from normal mode to check mode.
      Fig 1: Identifying Intelligent Tester To DLC3
      G04026795Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 tester.
      Fig 2: Identifying DTCS And Freeze Frame Data Using Tester
      G04026796Courtesy 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.