VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1453 and C1454

DTC Code DTC Name
C1453 Reservoir Level Switch Disconnected
C1454 Reservoir Level Low

DESCRIPTION

The brake fluid level warning switch sends the appropriate signal to the skid control ECU when the brake fluid level drops.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1453

Reservoir Level Switch Disconnected

With the ECU terminal IG1 voltage at 10 to 14 V, an open in the brake fluid level warning switch circuit continues for 2 seconds or more.

  • Brake fluid level

  • Brake fluid level warning switch (Brake master cylinder reservoir assembly)

  • Harness or connector

  • Master cylinder solenoid (Skid control ECU)

C1454

Reservoir Level Low

The fluid level of the reservoir is below the LOW level for 40 seconds after the engine switch is turned on (IG), or for 7 seconds during pump motor operation.

  • Brake fluid level

  • Brake fluid level warning switch (Brake master cylinder reservoir assembly)

  • Harness or connector

  • Master cylinder solenoid (Skid control ECU)

WIRING DIAGRAM

C223568E02

CAUTION / NOTICE / HINT

Note:

When replacing the master cylinder solenoid, perform calibration (Click here).

PROCEDURE

  1. CHECK BRAKE FLUID LEVEL

    1. Turn the engine switch off.

    2. Depress the brake pedal 40 times or more (until the pedal reaction feels light and pedal stroke becomes longer).

    3. Check the amount of fluid in the brake reservoir.

      Tip:

      When the engine switch is turned on (IG), brake fluid is sent to the accumulator and the fluid level decreases by approximately 5 mm (0.197 in.) from the level when the engine switch is off (normal).

      OK

      Brake fluid level is normal.

      Result

      Result

      OK

      NG
    NG

    CHECK AND REPAIR BRAKE FLUID LEAK

    OK

  2. INSPECT BRAKE FLUID LEVEL WARNING SWITCH

    1. Disconnect the A34 brake fluid level warning switch connector.

    2. C217215C01

      *a

      Component without harness connected

      (Brake Fluid Level Warning Switch)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Switch Condition

      Specified Condition

      1 (GND) - 2 (LBL)

      Float UP (Switch off)

      1.9 to 2.1 kΩ

      Float DOWN (Switch on)

      Below 1 Ω
      Tip:

      If there is no problem after finishing the above check, adjust the brake fluid level to the MAX level.

      Result

      Result

      OK

      NG
    NG

    REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY

    Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE FLUID LEVEL WARNING SWITCH)

    1. Disconnect the A7 skid control ECU connector.

    2. Disconnect the A34 brake fluid level warning switch connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A7-41 (LBL) - A34-2 (LBL)

      Always

      Below 1 Ω

      A7-41 (LBL) - Body ground

      Always

      10 kΩ or higher

      A34-1 (GND) - Body ground

      Always

      Below 1 Ω

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. RECONFIRM DTC

    1. Clear the DTCs.

      Click hereClick here

      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the engine switch off.

    3. Start the engine and idle it for approximately 40 seconds.

    4. Check if the same DTC is output.

      Click hereClick here

      Chassis > ABS/VSC/TRC > Trouble Codes

      Result

      Result

      Proceed to

      DTC is not output

      A

      DTC is output

      B
    A

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick here

    B

    REPLACE MASTER CYLINDER SOLENOID

    Click here