ELECTRONICALLY CONTROLLED BRAKE SYSTEM(w/ Vacuum Brake Booster), Diagnostic DTC:C1427

DTC Code DTC Name
C1427 Motor Malfunction

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area Note
C1427 Motor Malfunction Actuator pump motor does not operate properly.

  • Brake actuator assembly (Ground circuit)

  • Brake actuator assembly (Motor circuit)

  • Wire harness or connector

 -

WIRING DIAGRAM

Refer to DTCs C142B , C146C and C146D.

Click here

CAUTION / NOTICE / HINT

Note


  • When replacing the pump motor (brake actuator assembly), perform zero point calibration and store system information.

    Click here

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (MOTOR RELAY)


    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Select the Active Test using the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Motor Relay Motor relay Relay ON/OFF Operating sound of motor can be heard

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display
      Motor Relay

    4. Check the operating sound of the pump motor when operating it using the GTS.

      Result
      Result Proceed to
      Operating sound is not heard. A
      Operating sound is heard. B

    B

    RECONFIRM DTC Click here

    A

  2. CHECK HARNESS AND CONNECTOR (GND2 TERMINAL)


    1. Turn the engine switch off.

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

    3. Disconnect the A9 skid control ECU (brake actuator assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A9-1 (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

    Tech Tips

    The motor relay is in the skid control ECU (brake actuator assembly). Therefore, motor relay unit inspection cannot be performed. Be sure to check if the DTC is output before replacing the skid control ECU (brake actuator assembly).


    1. Reconnect the A9 skid control ECU (brake actuator assembly) connector.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRAC > Clear DTCs

    3. Turn the engine switch off.

    4. Start the engine.

    5. Perform a road test.

    6. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRAC > Trouble Codes
      Result
      Result Proceed to
      DTC C1427 is not output. A
      DTC C1427 is output. B

      Tech Tips


      • If a speed signal of 6 km/h (4 mph) or more is input to the skid control ECU (brake actuator assembly) with the engine switch on (IG) and the stop light switch assembly off, the ECU performs self diagnosis of the pump motor circuit.

      • If the normal system code is output (no DTCs are output), slightly jiggle the connectors, wire harness, and fuses of the skid control ECU (brake actuator assembly).

      • If any DTCs are output while jiggling a connector or wire harness of the skid control ECU (brake actuator assembly), inspect and repair the connector or wire harness.

      • If no DTCs were output when reconfirming DTCs, checking for intermittent problems is necessary because it is suspected that the original DTCs were stored due to the poor connection of a connector terminal.


    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

  4. RECONFIRM DTC

    Tech Tips

    The motor relay is in the skid control ECU (brake actuator assembly). Therefore, motor relay unit inspection cannot be performed. Be sure to check if the DTC is output before replacing the skid control ECU (brake actuator assembly).


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the engine switch off.

    3. Start the engine.

    4. Perform a road test.

    5. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1427 is not output. A
      DTC C1427 is output. B

      Tech Tips


      • If a speed signal of 6 km/h (4 mph) or more is input to the skid control ECU (brake actuator assembly) with the engine switch on (IG) and the stop light switch assembly off, the ECU performs self diagnosis of the pump motor circuit.

      • If the normal system code is output (no DTCs are output), slightly jiggle the connectors, wire harness, and fuses of the skid control ECU (brake actuator assembly).

      • If any DTCs are output while jiggling a connector or wire harness of the skid control ECU (brake actuator assembly), inspect and repair the connector or wire harness.

      • If no DTCs were output when reconfirming DTCs, checking for intermittent problems is necessary because it is suspected that the original DTCs were stored due to the poor connection of a connector terminal.


    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