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Home >> Lexus >> 2004 >> SC 430 >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> SFI System - Diagnosis >> Check Mode Procedure >> Check Mode Procedure
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Check Mode Procedure

  1. Make sure that the items below are true:
    1. Battery positive voltage 11 V or more
    2. Throttle valve fully closed
    3. Transmission in the P or N position
    4. A/C switched OFF
  2. Turn the ignition switch OFF.
  3. Connect the hand-held tester to the DLC3.
  4. Turn the ignition switch ON.
    Fig 1: Connecting Hand Held Tester To DLC3
    G01447352Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. Enter the following menus: DIAGNOSIS/ENHANCED OBD II/CHECK MODE. Make sure the MIL flashes as shown in the illustration.
    NOTE: All DTCs and freeze frame data recorded will be erased if: 1) the hand-held tester 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 to ACC or OFF.
    Fig 2: Waveform Representation Of MIL Flash
    G01447353Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. Start the engine. The MIL should turn off after the engine starts.
  7. Simulate the conditions of the malfunction described by the customer.
  8. After simulating the malfunction conditions, use the hand-held tester diagnosis selector to check the DTC, freeze frame data and other data.
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