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Home › Lexus › 2007 › RX 400h FWD › Repair and Diagnosis › Brakes › Traction Control › Brake Control › Electronically Controlled Brake System › DTC C1202/68 Master Reservoir Level Malfunction › Inspection Procedure

Inspection Procedure

NOTE: When replacing the skid control ECU assembly, perform initialization of the linear solenoid valve and calibration (See INITIALIZATION ).

HINT:

Before releasing the parking brake, set the chocks to hold the vehicle for safety.

  1. CHECK BRAKE FLUID LEVEL IN RESERVOIR 
    1. Check that the brake fluid level is sufficient.

    HINT:

    • If the fluid level drops, check for a fluid leak, and repair if found.
    • If no leaks exist, add and adjust fluid and then check that the trouble code is not output again.

    OK: Brake fluid level is proper. 

    NG: ADD BRAKE FLUID 

    OK: Go to next step 

  2. INSPECT BRAKE FLUID LEVEL WARNING SWITCH 
    1. Remove the reservoir tank cap and strainer.
    2. Disconnect the brake fluid level warning switch connector.
    3. Measure the resistance according to the value(s) in the table below.

    Resistance 

    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester Connection Fluid Level Specified Condition
    (B1-1) - (B1-2) Proper 1.84 to 2.16 kΩ
    (B1-1) - (B1-2) Below min.: level Below 1 Ω
    Fig 1: Identifying Brake Fluid Level Warning Switch Connector
    G05276858Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    NG: REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND FLUID LEVEL WARNING SWITCH) 
    1. Disconnect the skid control ECU connector and the brake fluid level warning switch connector.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      S41-6 (LBL) - (B1-2) Below 1 Ω
    3. Measure the resistance according to the value(s) in the table below.

    Resistance 

    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester Connection Specified Condition
    S41-6 (LBL) - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Identifying Skid Control ECU Connector And Brake Fluid Level Warning Switch Connector
    G05276859Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    OK: Go to next step 

  4. RECONFIRM DTC 
    1. Clear the DTCs (See DTC CHECK / CLEAR ).
    2. Turn the ignition switch on.
    3. Check the same DTCs are recorded (See DTC CHECK / CLEAR ).

    Result 

    RESULT CHART

    Condition Proceed To
    DTC is output A
    DTC is not output B

    HINT:

    This DTC may be memorized due to a malfunction in the connector terminal connection, etc.

    B: END 

    A: REPLACE SKID CONTROL ECU 

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