2007 Lexus GS 430FACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION) 
    1. Using the intelligent tester, check for any momentary interruption in the wire harness and connector corresponding to a DTC (see CHECK FOR INTERMITTENT PROBLEMS ).

    DATA LIST: ABS/VSC 

    NORMAL CONDITION CHART

    Item Measurement Item / Range (Display) Normal Condition
    EFI COM OPN EFI communication open detection / ERROR or NORMAL ERROR: Momentary interruption
    NORMAL: Normal

    OK: 

    There are no momentary interruptions. 

    HINT:

    Perform the above inspection before removing the sensor and connector.

    NG:  Go to step  3

    OK: Go to next step 

  2. CHECK DTC FOR ENGINE CONTROL SYSTEM 
    1. Clear the DTC (engine control system) (see DTC CHECK / CLEAR ).
    2. Check the DTC (engine control system) (see DTC CHECK / CLEAR ).

    Result 

    RESULT CHART

    Display (DTC Output) Proceed To
    DTC (engine control system) is not output A
    DTC (engine control system) is output B (see DIAGNOSTIC TROUBLE CODE CHART )

    B: REPAIR ENGINE CONTROL SYSTEM ACCORDING TO DTC OUTPUT 

    A: REPLACE ECM 

  3. REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM TO SKID CONTROL ECU) 
  4. RECONFIRM DTC 
    1. Clear the DTC (see DTC CHECK / CLEAR ).
    2. Perform a road test.
    3. Check that the same DTC is recorded (see DTC CHECK / CLEAR ).

    Result 

    RESULT CHART

    Display (DTC Output) Proceed To
    DTC (C1201/51) is not output A
    DTC (C1201/51) is output B

    B:  Go to step  2

    A: END 

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:

  • • 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.