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Home >> Lexus >> 2006 >> GX 470 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - SFI System Diagnostic Introduction, Diagnostic Trouble Code Table >> SFI System >> Check Mode Procedure
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Check Mode Procedure

HINT:

Intelligent tester only.

Compared to 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 ignition switch is turned from ON to 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 ignition switch OFF.
    3. Connect the intelligent tester to the DLC3.
    4. Turn the ignition switch ON.
    5. Turn the tester ON.
    6. Switch the ECM from normal mode to check mode.
      7. Fig 1: Identifying MIL Flashes Signal Waveform
      G04967781Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    7. Make sure that the MIL flashes.
    8. Start the engine.
    9. Make sure that the MIL turns OFF.
    10. Simulate the conditions of the malfunction described by the customer.
    11. Check DTCs and freeze frame data using the tester.
  2. CLEAR DTC (Using the intelligent tester) 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch ON.
    3. Erase DTCs and freeze frame data with the intelligent tester. Enter the following menus: DIAGNOSIS ENHANCED OBD II / DTC INFO / CLEAR CODES; and 2) press YES.
  3. CLEAR DTC (Not using the intelligent tester) 
    1. Remove the EFI and ETCS fuse from the engine room R/B for more than 60 seconds, or disconnect the battery terminal for more than 60 seconds. When disconnecting the battery terminal, perform the "INITIALIZE" procedure.
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