Dtc C1452 Accumulator Low Pressure

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

DESCRIPTION

INSPECTION PROCEDURE

CUSTOMER PROBLEM ANALYSIS

RECONFIRM DTC

CHECK HYDRAULIC CIRCUIT

READ VALUE USING GTS (ACCUMULATOR SENSOR)

RECONFIRM DTC

DTC C1452 Accumulator Low Pressure


DESCRIPTION


DTC Code
DTC Detection Condition
Trouble Area
C1452
After braking, the fluid pressure inside the accumulator is less than the threshold within 3.2 seconds.
  1. Hydraulic circuit
  2. Master cylinder solenoid (Accumulator pressure sensor)

INSPECTION PROCEDURE

NOTICE:
After replacing the master cylinder solenoid, perform zero point calibration (Click here).
1.CUSTOMER PROBLEM ANALYSIS

  1. Check with the customer to determine if frequent braking has been performed.


NEXT


2.RECONFIRM DTC

  1. Clear the DTC (Click here).

  1. Turn the ignition switch off.

  1. Depress the brake pedal more than 40 times.

  1. Turn the ignition switch to ON.

  1. Wait for 99 seconds.

  1. Check if the same DTC is output (Click here).

    Result
    Result
    		Proceed to
    DTC is output
    		A
    Frequent braking was not performed and DTC is not output
    		B
    Frequent braking was performed and DTC is not output
    		C

    HINT:
    Excessive brake pedal operation results in abnormal accumulator pressure consumption. This is normal.


B
CHECK FOR INTERMITTENT PROBLEMS (Click here)

C
END
A


3.CHECK HYDRAULIC CIRCUIT

  1. Check the hydraulic circuit (Click here).

    OK:
    Hydraulic circuit is normal (no leakage).


NG
REPAIR HYDRAULIC CIRCUIT
OK


4.READ VALUE USING GTS (ACCUMULATOR SENSOR)

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the GTS on.

  1. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.


ABS/VSC/TRC
Tester Display
Measurement Item/Range
Normal Condition
Diagnostic Note
Accumulator Sensor
Accumulator pressure sensor reading/ Min.: 0.00 V, Max.: 5.00 V
3.58 to 5 V
If the value is constant regardless of the pump operation, an accumulator pressure sensor malfunction is suspected.

  1. Check that the accumulator output value is normal.

    OK:
    Accumulator pressure sensor value is normal.
    Result
    Result
    		Proceed to
    OK
    		A
    NG (for LHD)
    		B
    NG (for RHD)
    		C


B
REPLACE MASTER CYLINDER SOLENOID (Click here)

C
REPLACE MASTER CYLINDER SOLENOID (Click here)
A


5.RECONFIRM DTC

  1. Clear the DTCs (Click here).

  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)