ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1202/68

DTC Code DTC Name
C1202/68 Master Reservoir Level Malfunction

DESCRIPTION

When a fluid level drop in the brake master cylinder reservoir assembly is detected, a signal is sent to the skid control ECU assembly.

If a DTC for the fluid level drop is stored, the warning will be canceled and the DTC will be cleared when the fluid level returns to normal.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1202/68 Master Reservoir Level Malfunction

511

512

  • INF Code: 511


    • When the brake fluid level has dropped to the warning level, it is determined that each cylinder reservoir is empty or will soon become empty.

  • INF Code: 512


    • An open is detected in the switch signal circuit for 2 seconds or more.

  • INF Code: 511


    • Low brake fluid level

    • Brake fluid leaks

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

    • Short in wire harness

    • Skid control ECU assembly

  • INF Code: 512


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

    • Open in wire harness

    • Skid control ECU assembly

 Electronically controlled brake system DTC

WIRING DIAGRAM

A0021MSE04
*a Brake Fluid Level Warning Switch (Brake Master Cylinder Reservoir Assembly)
*b Skid Control ECU Assembly

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU assembly, perform initialization and calibration of the linear solenoid valve.

Click here

Tech Tips

Before releasing the parking brake, chock the wheels for safety.

PROCEDURE


  1. CHECK BRAKE FLUID LEVEL


    1. Check that the brake fluid level is sufficient.

      OK
      Brake fluid level is sufficient.

      Tech Tips


      • If the fluid level is low, check for fluid leaks, and repair as necessary.

      • Check for brake fluid leaks (connection between the brake actuator assembly and brake master cylinder reservoir assembly, and the brake actuator assembly and wheel cylinders).

      • If no leaks exist, add and adjust fluid and then check that the trouble code is not output again.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK AND REPAIR BRAKE FLUID LEAKS OR ADD FLUID

    OK

  2. INSPECT BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY


    1. A0021MKC09
      *a

      Component without harness connected

      (Brake Fluid Level Warning Switch (Brake Master Cylinder Reservoir Assembly))

      Remove the reservoir filler cap and strainer.

    2. Make sure that there is no looseness at the locking part and the connecting part of the connector.

    3. Disconnect the A27 brake fluid level warning switch (brake master cylinder reservoir assembly) connector.

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

      Tech Tips

      A float is located inside the reservoir. Its position changes according to the level of brake fluid.

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (LBL) - 1 (GND) Brake fluid level warning switch (Brake master cylinder reservoir assembly) off (float up) 1.84 to 2.16 kΩ
      2 (LBL) - 1 (GND) Brake fluid level warning switch (Brake master cylinder reservoir assembly) on (float down) Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY for LHD: Click here
    REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY for RHD: Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY)


    1. Make sure that there is no looseness at the locking part and the connecting part of the connector.

    2. Disconnect the A24 skid control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A24-45 (LBL) - A27-2 (LBL) Always Below 1 Ω
      A24-45 (LBL) or A27-2 (LBL) - Body ground Always 10 kΩ or higher
      A27-1 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT SKID CONTROL ECU ASSEMBLY (SWITCH INPUT)


    1. A0022OSC07
      *a

      Front view of wire harness connector

      (to Brake Fluid Level Warning Switch (Brake Master Cylinder Reservoir Assembly))

      Reconnect the A24 skid control ECU assembly connector.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A27-2 (LBL) - Body ground Power switch on (IG) 8.25 to 10.5 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SKID CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE SKID CONTROL ECU ASSEMBLY for RHD: Click here

    OK

  5. RECONFIRM DTC


    1. Reconnect the A27 brake fluid level warning switch (brake master cylinder reservoir assembly) connector.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the power switch off.

    4. Turn the power switch on (IG).

    5. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1202/68 is not output. A
      DTC C1202/68 is output. B

      Tech Tips

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step.

      Click here


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE SKID CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE SKID CONTROL ECU ASSEMBLY for RHD: Click here