DTC    C1391/69    Accumulator Leak Malfunction

for Preparation Click here


DESCRIPTION

The DTC is stored if a brake fluid, internal or other leak is detected due to improper sealing in the actuator. Internal leakage is suspected if the pump motor operates frequently without braking.

DTC No.
INF Code
DTC Detecting Condition
Trouble Area
C1391/69
591
Accumulation performance is deteriorated (improper sealing inside the actuator, gas pressure drop inside the accumulator, leak in each pressure boosting valve).
  1. Fluid leakage
  2. Brake actuator assembly

INSPECTION PROCEDURE

NOTICE:
When replacing the skid control ECU assembly, perform initialization of linear solenoid valve and calibration (Click here).

1.CHECK BRAKE FLUID LEAKAGE

  1. Check that there is no fluid leakage in the brake line between the brake actuator and the wheel cylinder which is the cause of DTCs.

  1. Check that the brake is not dragging.

    OK:
    There is no fluid leakage or dragging.



NG
REPAIR OR REPLACE APPLICABLE PART
OK


2.READ VALUE OF INTELLIGENT TESTER (ACCUMULATOR PRESSURE SENSOR)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on.

  1. Select the DATA LIST mode on the intelligent tester.

    ABS / VSC / TRAC: 
    Item
    		Measurement Item /
    Range (Display)
    		Normal Condition
    Accumulator Sensor
    		Accumulator pressure sensor /
    min.: 0 V, max.: 5 V
    		Specified value: 3.2 to 4.0 V

  1. Depress the brake pedal 4 or 5 times to operate the pump motor, and check the output value on the intelligent tester with the motor operated and check the output value on the intelligent tester with the motor stopped (no braking).

    OK:
    Accumulator (ACC) pressure sensor voltage does not drop.



NG
REPLACE BRAKE ACTUATOR ASSEMBLY
OK

REPLACE SKID CONTROL ECU