Dtc C1453 Reservoir Level Switch Disconnected

Brake. Land Cruiser. Urj200, 202 Grj200 Vdj200
Brake Control Dynamic Control Systems. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK BRAKE FLUID LEVEL

INSPECT BRAKE FLUID LEVEL WARNING SWITCH

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

RECONFIRM DTC

DTC C1453 Reservoir Level Switch Disconnected

DTC 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.
  1. Brake fluid level
  2. Brake fluid level warning switch (Brake master cylinder reservoir sub-assembly)
  3. Harness or connector
  4. 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


Land Cruiser. Urj200, 202 Grj200 Vdj200.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1453 Reservoir Level Switch Disconnected


INSPECTION PROCEDURE

NOTICE:
After replacing the master cylinder solenoid, perform zero point calibration and store the system information (Click here).
1.CHECK BRAKE FLUID LEVEL

  1. Turn the ignition switch off.

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

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

    HINT:
    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.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1453 Reservoir Level Switch Disconnected

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

    HINT:
    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
    Text in Illustration
    *a
    		Component without harness connected
    (Brake Fluid Level Warning Switch [Brake Master Cylinder Reservoir Sub-assembly])
    HINT:
    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.

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

  1. 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).

  1. Turn the ignition switch off.

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

  1. 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)