VEHICLE STABILITY CONTROL SYSTEM (for Hydraulic Brake Booster), Diagnostic DTC:C1254

DTC Code DTC Name
C1254 Pressure Sensor or Switch

DESCRIPTION

The accumulator pressure sensor is connected to the skid control ECU in the master cylinder solenoid.

A01DN8GE04
DTC Code DTC Detection Condition Trouble Area
C1254 There is an accumulator pressure sensor malfunction (the fluid pressure does not change when the pump operates or when the brake is applied). Master cylinder solenoid (Accumulator pressure sensor)

INSPECTION PROCEDURE

Note

When replacing the master cylinder solenoid, perform calibration Click here.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (ACCUMULATOR SENSOR)


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Depress the brake pedal more than 40 times.

    4. Turn the ignition switch to ON.

    5. Turn the intelligent tester on.

    6. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Accumulator Sensor Accumulator pressure sensor reading/ Min.: 0.00 V, Max.: 5.00 V 3.58 to 5 V If the value is constant regardless of the pump operation, an accumulator pressure sensor malfunction is suspected.

    7. Check the accumulator output value.

      Result
      Result Proceed to
      Output value is within "Normal Condition" range A
      Output value is out of "Normal Condition" range (for LHD) B
      Output value is constant regardless of pump operation (for LHD)
      Output value is out of "Normal Condition" range (for RHD) C
      Output value is constant regardless of pump operation (for RHD)

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    REPLACE MASTER CYLINDER SOLENOID Click here

    A

  2. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Turn the ignition switch off.

    3. Depress the brake pedal more than 40 times.

    4. Turn the ignition switch to ON.

    5. Wait until the pump motor stops.

    6. Wait for 15 minutes.

    7. Depress the brake pedal and release it.

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

      Result
      Result Proceed to
      DTC is not output A
      DTC is output (for LHD) B
      DTC is output (for RHD) C

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    REPLACE MASTER CYLINDER SOLENOID Click here

    A

    USE SIMULATION METHOD TO CHECK Click here