2004 Lexus LS 430FACTORY OEM SERVICE PROCEDURE

DTC Check/Clear

  1. CHECK DTC 

    DTCs which are stored in the ECM can be displayed with the hand-held tester or generic OBD II scan tool.

    These scan tools can display pending DTCs and current DTCs. Some DTC aren't stored if the ECM doesn't detect a malfunction during consecutive driving. However, the detected malfunction during once driving is stored as pending DTC.

    1. Connect the hand-held tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the Data Link Connector 3 (DLC3).
      Fig 1: Connecting CAN VIM To Data Link Connector 3 (DLC3)
      G01409460Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch ON.
    3. Enter the following menus: DIAGNOSIS/ ENHANCED OBD II/ DTC INFO/ CURRENT CODES (or PENDING CODE).
    4. Confirm the DTCs and freeze frame data and then write them down.
    5. See DIAGNOSTIC TROUBLE CODE CHART  to confirm the details of the DTCs.
      NOTE: When simulating a symptom with the scan tool to check for DTCs, use normal mode. For codes on DIAGNOSIS TROUBLE CODE CHART subject to "2-trip detection logic", perform the following actions.

      Turn the ignition switch OFF after the symptom is simulated once. Then repeat the simulation process again. When the problem has been simulated twice, the MIL illuminates and the DTCs are recorded in the ECM.

  2. CLEAR DTC 
    1. Connect the hand-held tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
    2. Turn the ignition switch ON.
    3. Enter the following menus: DIAGNOSIS/ ENHANCED OBD II/ DTC INFO/ CLEAR CODES and press YES.
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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.