Dtc C1453 Reservoir Level Switch Disconnected


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 sends the appropriate signal to the skid control ECU 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 assembly)
  3. Harness or connector
  4. Master cylinder solenoid (Skid control ECU)
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, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1453 Reservoir Level Switch Disconnected


INSPECTION PROCEDURE

NOTICE:
When replacing the master cylinder solenoid, perform calibration (LandCruiser RM00000452J00ZX.html).
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 A90 brake fluid level warning switch connector.



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.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)
    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 ASSEMBLY (LandCruiser RM00000171U02DX.html)

C
REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY (LandCruiser RM00000171U02EX.html)
A


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

  1. Disconnect the A7 skid control ECU connector.

  1. Disconnect the A90 brake fluid level warning switch connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A7-41 (LBL) - A90-2 (LBL)
    		Always
    		Below 1 Ω
    A7-41 (LBL) - Body ground
    		Always
    		10 kΩ or higher
    A90-1 (GND) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.RECONFIRM DTC

  1. Clear the DTC (LandCruiser RM0000046KV016X.html).

  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 (LandCruiser RM0000046KV016X.html).

    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 (LandCruiser RM00000171U02DX.html)

C
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02EX.html)
A

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)