Click here

ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1365/54

Click here
Click here Click here
DTC Code DTC Name
C1365/54 Accumulator Pressure Sensor Malfunction
Click here

DESCRIPTION

The accumulator pressure sensor is built into the brake actuator.

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

DTC Code Information Code DTC Detection Condition Trouble Area
C1365/54 211 Sensor power 1 (VCM1) voltage is 4.7 V or less or 5.3 V or more for at least 0.05 seconds.

  • Accumulator pressure sensor

  • Accumulator pressure sensor circuit

  • Accumulator pressure sensor power supply

  • Brake actuator

  • Skid control ECU
↑ 212 Accumulator pressure sensor output voltage is less than 0.25 or 4.53 V or more for at least 0.05 seconds. ↑
↑ 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. ↑
↑ 215 The accumulator pressure sensor output voltage is stuck at 4.53 V or less. ↑
Click here

WIRING DIAGRAM

Refer to DTCs C1246/46 and C1364/61 (see pageClick here).

Click here

INSPECTION PROCEDURE

Note:

  • When replacing the skid control ECU, perform the following operations:


    • Initialization of linear solenoid valve and calibration (see pageClick here)

    • Yaw rate and acceleration sensor zero point calibration (see pageClick here)

  • When replacing the brake actuator, perform initialization of the linear solenoid valve and calibration (see pageClick here).

Click here

PROCEDURE


  1. Click here

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


    1. A01H1MKE34
      A01H1MKE31

      Disconnect the A19 ECU connector.

    2. Disconnect the A27 actuator connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      A19-9 (PCK1) - A27-37 (PCK1) Always Below 1 Ω
      A19-26 (PAC1) - A27-46 (PAC1) Always Below 1 Ω
      A19-27 (VCM) - A27-35 (VCM) Always Below 1 Ω
      A19-28 (E) - A27-45 (E) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      A19-9 (PCK1) - A27-12 (PCK1) Always Below 1 Ω
      A19-26 (PAC1) - A27-15 (PAC1) Always Below 1 Ω
      A19-27 (VCM) - A27-10 (VCM) Always Below 1 Ω
      A19-28 (E) - A27-14 (E) Always Below 1 Ω

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A19-9 (PCK1) - Body ground Always 10 kΩ or higher
      A19-26 (PAC1) - Body ground Always 10 kΩ or higher
      A19-27 (VCM) - Body ground Always 10 kΩ or higher
      A19-28 (E) - Body ground Always 10 kΩ or higher

  2. Click here

    RECONFIRM DTC


    1. Clear the DTC (see pageClick here).

    2. Turn the power switch ON (IG).

    3. Check if the same DTC is recorded (see pageClick here).

      Tip:

      Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

      Table 1. Result
      Result Proceed to
      DTC (C1365/54) is output A
      DTC (C1365/54) is not output B

  3. Click here

    USE SIMULATION METHOD TO CHECKClick here

  4. Click here

    CHECK FREEZE FRAME DATA


    1. Check the information code from the "FREEZE FRAME DATA" memorized when the DTC (C1365/54) is stored (see pageClick here).

      Table 2. Result
      Result Proceed to
      Sensor power supply voltage trouble code (211) is output for LHD A
      for RHD B
      Sensor output value trouble codes (212, 214 and 215) are output for LHD C
      for RHD D

  5. Click here

    REPLACE SKID CONTROL ECUClick here

  6. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. Click here

    REPLACE BRAKE ACTUATORClick here

  8. Click here

    REPLACE SKID CONTROL ECUClick here

  9. Click here

    REPLACE BRAKE ACTUATORClick here