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ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1365

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DTC Code DTC Name
C1365 Accumulator Pressure Sensor
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DESCRIPTION

The accumulator pressure sensor is built into the brake actuator assembly.

The skid control ECU 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 ABS 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 Accumulator Pressure Sensor

211

212

214

215

  • INF Code: 211


    • Sensor supply voltage 1 (VCM) is 4.7 V or less, or 5.3 V or more for 0.05 seconds or more.

  • INF Code: 212


    • Output voltage of accumulator pressure sensor (PAC1) is 0.25 V or less, or 4.53 V or more for 0.05 seconds or more.

  • INF Code: 214


    • While the motor is off, the total of the wheel cylinder pressure sensor values of all 4 wheels increases but the accumulator pressure changes little for 0.5 seconds or more.

  • INF Code: 215


    • Output voltage of accumulator pressure sensor (PAC1) is stuck at 4.53 V or less.

  • INF Code: 211


    • Open or short in accumulator pressure sensor power supply circuit

    • Improperly connected connector, deformation or corrosion of terminals

    • Accumulator pressure sensor

    • Brake actuator assembly

    • Skid control ECU assembly

  • INF Code: 212, 214, 215


    • Open or short in accumulator pressure sensor power supply circuit

    • Improperly connected connector, deformation or corrosion of terminals

    • Brake actuator assembly

    • Skid control ECU assembly

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WIRING DIAGRAM

Refer to DTCs C1246 and C1364.

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CAUTION / NOTICE / HINT

Note:

When replacing the skid control ECU assembly or brake actuator assembly, perform initialization and calibration of the linear solenoid valve.

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PROCEDURE


  1. Click here

    CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)


    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

    2. Disconnect the A10 skid control ECU assembly connector.

    3. Disconnect the A8 brake actuator assembly connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Table 1. for LHD:
      Tester Connection Condition Specified Condition
      A10-8 (E) - A8-14 (E) Always Below 1 Ω
      A10-8 (E) or A8-14 (E) - Body ground Always 10 kΩ or higher
      A10-9 (VCM) - A8-10 (VCM) Always Below 1 Ω
      A10-9 (VCM) or A8-10 (VCM) - Body ground Always 10 kΩ or higher
      A10-21 (PAC1) - A8-15 (PAC1) Always Below 1 Ω
      A10-21 (PAC1) or A8-15 (PAC1) - Body ground Always 10 kΩ or higher
      A10-31 (PCK1) - A8-12 (PCK1) Always Below 1 Ω
      A10-31 (PCK1) or A8-12 (PCK1) - Body ground Always 10 kΩ or higher
      Table 2. for RHD:
      Tester Connection Condition Specified Condition
      A10-8 (E) - A8-45 (E) Always Below 1 Ω
      A10-8 (E) or A8-45 (E) - Body ground Always 10 kΩ or higher
      A10-9 (VCM) - A8-35 (VCM) Always Below 1 Ω
      A10-9 (VCM) or A8-35 (VCM) - Body ground Always 10 kΩ or higher
      A10-21 (PAC1) - A8-46 (PAC1) Always Below 1 Ω
      A10-21 (PAC1) or A8-46 (PAC1) - Body ground Always 10 kΩ or higher
      A10-31 (PCK1) - A8-37 (PCK1) Always Below 1 Ω
      A10-31 (PCK1) or A8-37 (PCK1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    INSPECT SKID CONTROL ECU ASSEMBLY (SENSOR POWER SUPPLY OUTPUT)


    1. B004YC8C29
      *a

      Component with harness connected

      (Skid Control ECU Assembly)

      Reconnect the A10 skid control ECU assembly connector.

    2. Reconnect the A8 brake actuator assembly connector.

    3. Turn the power switch on (IG).

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A10-9 (VCM) - Body ground Power switch on (IG) 4.75 to 5.25 V
      Result
      Proceed to
      OK
      NG

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    INSPECT SKID CONTROL ECU ASSEMBLY (SENSOR INPUT)


    1. B004YC8C30
      *a

      Component with harness connected

      (Skid Control ECU Assembly)

      Depress the brake pedal to operate the pump motor, and then check that the pump motor stops.

      Note:

      Do not depress the brake pedal until the pump motor stops and the voltage check is finished in order to maintain the accumulator pressure.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A10-21 (PAC1) - Body ground Power switch on (IG), after pump motor operates and stops by pedal operation 3 to 4.7 V
      Result
      Proceed to
      OK
      NG

  4. Click here

    READ VALUE USING GTS (ACCUMULATOR PRESSURE SENSOR)


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Select the Data List on the GTS.

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      1. 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: 2.60 to 3.80 V When brake fluid is stored in the accumulator: Accumulator pressure changes in accordance with volume of fluid stored in the accumulator



      1. Chassis > ABS/VSC/TRC > Data List
        Tester Display
        Accumulator Sensor




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

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

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

      OK
      Accumulator pressure sensor output value change is less than 0.20 V.
      Result
      Proceed to
      OK
      NG

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    RECONFIRM DTC


    1. Clear the DTCs.

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      1. Chassis > ABS/VSC/TRC > Clear DTCs


    2. Turn the power switch off.

    3. Turn the power switch on (READY).

    4. Perform a road test.

    5. Check if the same DTC is output.

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      1. Chassis > ABS/VSC/TRC > Trouble Codes


      Result
      Result Proceed to
      DTC C1365 is output. A
      DTC C1365 is not output. B

    • A

      REPLACE SKID CONTROL ECU ASSEMBLY for LHD:Click here

      REPLACE SKID CONTROL ECU ASSEMBLY for RHD:Click here

    • B

      USE SIMULATION METHOD TO CHECKClick here