LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2007 >> GS 430 >> Repair and Diagnosis >> Brakes >> Traction Control >> Brake Control >> Electronically Controlled Brake System >> DTC C1201/51 Engine Control System Malfunction >> Inspection Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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 ).

    ABS / VSC: 

    NORMAL CONDITION CHART

    Item (Display) 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 (see TERMINALS OF ECM ).
    2. Check for the DTC (see TERMINALS OF ECM ).

    Result 

    RESULT CHART

    Display (DTC Output) Proceed To
    DTC (engine control system) is not output A
    DTC (engine control system) is output B (see DATA LIST / ACTIVE TEST )

    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 if 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 

scientia non olet · About LEMON Manuals