2008 Lexus IS FFACTORY OEM SERVICE PROCEDURE

DTC Check/Clear

NOTE: When the diagnosis system is changed from normal mode to check mode or vice versa, all DTCs and freeze frame data recorded in normal mode are cleared. Before changing modes, always check and record DTCs and freeze frame data.

HINT

  • DTCs which are stored in the ECM can be displayed on the Techstream The Techstream can display the current and pending DTCs
  • Some DTCs are only set if the ECM detects the same malfunction again during a second consecutive driving cycle However, such malfunctions, detected on only one occasion, are stored as pending DTCs.
  1. CHECK DTCΒ 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG)
    3. Turn the Techstream ON
    4. Enter the following menus. Powertrain / Engine / Trouble Codes
    5. Check the DTC(s) and freeze frame data, and then write them down.
    6. Check the details of the DTC(s) (See DIAGNOSTIC TROUBLE CODE CHARTΒ  )
  2. CLEAR DTCΒ 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG)
    3. Turn the Techstream ON
    4. Enter the following menus. Powertrain / Engine / DTC / Trouble Codes.
    5. Clear DTCs
  3. CLEAR DTC (Without using the Techstream)Β 
    1. Perform either one of the following operations.
      1. Disconnect the cable from the negative (-) battery terminal.
      2. Remove the EFI MAIN and ETCS fuses from the engine room No. 2 relay block located inside the engine compartment for more than 1 minute
Factory Service Tools

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When to See a Mechanic

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

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

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