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.

The skid control ECU detects the accumulator pressure from the data sent from the accumulator pressure sensor, and then runs and stops the pump motor by operating the motor relay.

DTCs may be output if the accumulator pressure drops due to frequent braking (this is not a malfunction).

DTC Code 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 (Skid control ECU or brake actuator)
↑ 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.

 ↑

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (ACCUMULATOR PRESSURE SENSOR)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the Data List on the intelligent tester Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Accumulator Sensor

      Accumulator pressure sensor /

      Min.: 0 V, Max.: 5 V

      		 Specified value: 2.9 to 4.2 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 values change is within the specified range.

      OK
      Accumulator pressure sensor output values change is within 0.55 V.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

    C

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

    A

  2. RECONFIRM DTC


    1. Turn the power switch off.

    2. Clear the DTCs Click here.

    3. Perform a road test.

    4. Check if the same DTC is recorded 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

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

    C

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here