ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1453, C1454

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

DESCRIPTION

The brake fluid level warning switch (brake master cylinder reservoir sub-assembly) sends the appropriate signal to the skid control ECU (master cylinder solenoid) when the brake fluid level drops.

DTC Code DTC Detection Condition Trouble Area
C1453 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 sub-assembly)

  • Harness or connector

  • Skid control ECU (Master cylinder solenoid)
C1454 The fluid level of the reservoir is below the LOW level for 40 seconds after the ignition switch is turned to ON, or for 7 seconds during pump motor operation.

WIRING DIAGRAM

A015BNNE11

INSPECTION PROCEDURE

Note

After replacing the master cylinder solenoid, perform zero point calibration Click here.

PROCEDURE


  1. CHECK BRAKE FLUID LEVEL


    1. Turn the ignition 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.

      Tech Tips

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

      OK
      Brake fluid level is normal.

    NG

    CHECK AND REPAIR BRAKE FLUID LEAK

    OK

  2. INSPECT BRAKE FLUID LEVEL WARNING SWITCH


    1. Disconnect the A26 brake fluid level warning switch (brake master cylinder reservoir sub-assembly) connector.

    2. A015BWGE06
      Text in Illustration
      *a

      Component without harness connected

      (Brake Fluid Level Warning Switch [Brake Master Cylinder Reservoir Sub-assembly])

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

      Tech Tips

      A float is placed inside the reservoir. Its position can be changed by increasing/decreasing the level of brake fluid.

      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

      Tech Tips

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

      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE BRAKE MASTER CYLINDER RESERVOIR SUB-ASSEMBLY Click here

    C

    REPLACE BRAKE MASTER CYLINDER RESERVOIR SUB-ASSEMBLY Click here

    A

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


    1. Disconnect the A24 skid control ECU (master cylinder solenoid) connector.

    2. Disconnect the A26 brake fluid level warning switch (brake master cylinder reservoir sub-assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A24-41 (LBL) - A26-2 (LBL) Always Below 1 Ω
      A24-41 (LBL) - Body ground Always 10 kΩ or higher
      A26-1 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. RECONFIRM DTC


    1. Clear the DTC Click here.

    2. Turn the ignition switch off.

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

    4. Check if the same DTC is output Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output (for LHD) B
      DTC is output (for RHD) C

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    REPLACE MASTER CYLINDER SOLENOID Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here