ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1365/54

DTC Code DTC Name
C1365/54 Accumulator Pressure Sensor Malfunction

DESCRIPTION

The accumulator pressure sensor is built into the brake actuator (brake booster with master cylinder assembly).

The skid control ECU (brake booster with master cylinder assembly) detects the accumulator pressure from the data sent from the accumulator pressure sensor, and then starts and stops the pump motor by operating the motor relay.

This DTC may be stored if the accumulator pressure drops due to frequent braking (this is not a malfunction).

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

Note

C1365/54

Accumulator Pressure Sensor Malfunction

331

332

333

334

  • INF Code: 331

    • Sensor supply voltage (VACC) is 4.54 V or less, or 5.46 V or more for 0.8 seconds or more.

  • INF Code: 332

    • Accumulator pressure sensor output voltage (PACC) is less than 8%, or 88% or more of sensor supply voltage for 0.8 seconds or more (less than 0.4 V, or 4.4 V or more for 0.8 seconds or more).

  • INF Code: 333

    • Fluctuation of sensor output is out of specification (the difference between the present value and last value is 7.5 MPa (77.0 kgf/cm2, 1088 psi)) for 0.8 seconds or more.

  • INF Code: 334

    • At a vehicle speed of 6 km/h (4 mph) or more and accumulator pressure sensor output value of 19.7 MPa (200.8 kgf/cm2, 2857 psi) or less, the pump motor does not operate for 12 seconds or more.

Brake booster with master cylinder assembly

Electronically controlled brake system DTC

CAUTION / NOTICE / HINT

Note:

When replacing the skid control ECU (brake booster with master cylinder assembly) or brake actuator (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve.

Click here

PROCEDURE

  1. READ VALUE USING GTS (ACCUMULATOR PRESSURE SENSOR)

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the Data List on the GTS.

      Click here

      Chassis > ABS/VSC/TRC > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      Accumulator Sensor

      Accumulator pressure sensor

      Min.: 0.00 V, Max.: 5.00 V

      Specified value: 2.90 to 4.20 V

      When brake fluid is stored in the accumulator: Accumulator pressure changes in accordance with volume of fluid stored in the accumulator

      Chassis > ABS/VSC/TRC > Data List

      Tester Display

      Accumulator Sensor

    4. Depress the brake pedal 4 or 5 times to operate the pump motor.

    5. Wait for 30 seconds without depressing the brake pedal.

    6. Check that the accumulator pressure sensor output value change is within the specified range.

      OK

      Accumulator pressure sensor output value change is less than 0.55 V.

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

    for LHD:Click here

    for RHD:Click here

    OK

  2. RECONFIRM DTC

    1. Turn the power switch off.

    2. Clear the DTCs.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the power switch off.

    4. Perform a road test.

    5. Check if the same DTC is output.

      Click here

      Chassis > ABS/VSC/TRC > Trouble Codes

    Result

    Result

    Proceed to

    DTC C1365/54 is not output.

    A

    DTC C1365/54 is output.

    B
    A

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick here

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

    for LHD:Click here

    for RHD:Click here