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 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. INF Code DTC Detection Condition Trouble Area
C1365/54 331 Sensor supply voltage (VACC) is 4.54 V or less, or 5.46 V or more for 0.8 seconds or more. Brake booster with master cylinder assembly
↑ 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). ↑
↑ 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.

 ↑
↑ 334

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

 ↑

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 ignition switch to ON (IG).

    3. Select the Data List on the GTS Click here.

      ABS/VSC/TRC
      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

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

    5. 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
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    C

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    A

  2. RECONFIRM DTC


    1. Turn the ignition switch off.

    2. Clear the DTCs Click here.

    3. Perform a road test.

    4. Check if the same DTC is output Click here.

      Result
      Result Proceed to
      DTC C1365/54 is not output. A
      DTC C1365/54 is output (for LHD). B
      DTC C1365/54 is output (for RHD). C

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    C

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here