2008 Lexus IS FFACTORY 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. Shift lever in P or N
      4. A/C 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 / ECT / Check Mode
    7. Change the TCM to check mode Make sure the MIL flashes as shown in the illustration
      NOTE: All DTCs and freeze frame data will be cleared if: 1) the Techstream is used to change the TCM from normal mode to check mode or vice versa; or 2) during check mode, the engine switch is turned from on (IG) to on (ACC) or off.
      Before entering check mode, make notes of the DTCs and freeze frame data.
    8. Start the engine The MIL should turn off after the engine starts
    9. Perform Monitor Drive Pattern for the ECT test (See MONITOR DRIVE PATTERN  )

      (Or, simulate the conditions of the malfunction described by the customer.)

      Fig 1: Malfunction Indicator Lamp Blinking Pattern
      G04948293Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    10. After simulating the malfunction conditions, use the Techstream to check the DTC 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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