VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1428

DTC Code DTC Name
C1428 Motor Circuit Malfunction

DESCRIPTION

This DTC is stored when the skid control ECU (brake actuator assembly) judges that an abnormality occurred in the circuit used to operate the pump motor.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1428 Motor Circuit Malfunction A malfunction occurs in the pump motor circuit. Pump motor circuit

WIRING DIAGRAM

Refer to DTC C146C.

Click here

CAUTION / NOTICE / HINT

Note


  • When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibration.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (+BM TERMINAL)


    1. B0071RIC75
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

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

      OK
      The connector is securely connected.

    2. Disconnect the A34 skid control ECU (brake actuator assembly) connector.

    3. Check both the connector case and the terminals for deformation and corrosion.

      OK
      No deformation or corrosion.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A34-1 (+BM) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (+BM CIRCUIT)

    OK

  2. CHECK HARNESS AND CONNECTOR (GND2 TERMINAL)


    1. B0071RIC76
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A34-14 (GND2) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT)

    OK

  3. RECONFIRM DTC


    1. Reconnect the A34 skid control ECU (brake actuator assembly) connector.

    2. Clear the DTCs.


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the ignition switch off.

    4. Start the engine.

    5. Perform a road test.

    6. Check if the same DTC is output.


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      C1428 is not output A
      C1428 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY for LHD: Click here
    REPLACE BRAKE ACTUATOR ASSEMBLY for RHD: Click here