ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1427

DTC Code DTC Name
C1427 Motor Malfunction

DESCRIPTION

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

  • ABS NO. 1 fuse

  • Brake actuator assembly (Ground circuit)

  • Brake actuator assembly (Motor circuit)

WIRING DIAGRAM

Refer to DTCs C146C and C146D.

Click here

CAUTION / NOTICE / HINT

Note


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

  • When replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and CVT oil pressure calibration (for continuously variable transaxle).

    K111: Click here

    K111F: Click here

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (MOTOR RELAY)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.

    5. According to the display on the GTS, perform the Active Test.


      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.

      Vehicle condition: Vehicle stopped

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

    6. Check the operating sound of the motor relay when operating it with the GTS.

      Result
      Proceed to
      The operating sound is not heard
      The operating sound is heard

    The operating sound is heard

    GO TO STEP 3 Click here

    The operating sound is not heard

  2. CHECK HARNESS AND CONNECTOR (GND2 TERMINAL)


    1. Turn the ignition switch off.

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

    3. Disconnect the A63 skid control ECU (brake actuator assembly) connector.

    4. A01KAJTC63
      *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
      A63-13 (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

    This code is detected when a problem is identified in the brake actuator assembly.

    The motor relay is in the brake actuator assembly.

    Therefore, motor relay unit inspection cannot be performed. Be sure to check if the DTC is output before replacing the brake actuator assembly.


    1. Turn the ignition switch off.

    2. Reconnect the A63 skid control ECU (brake actuator assembly) connector.

    3. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    4. Start the engine.

    5. Drive the vehicle at a speed of 20 km/h (12 mph) or more for 30 seconds or more.

    6. Check if the same DTC is recorded.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes

      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 ignition switch ON and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits.

      • If the normal system code is output (no trouble codes are output), slightly jiggle the connectors, wire harness, and fuses of the brake actuator assembly. Make sure that no DTCs are output.

      • 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.

      • The DTCs were probably output due to a bad connection of the connector terminal.

      Result
      Proceed to
      DTC C1427 is not output
      DTC C1427 is output

    DTC C1427 is not output

    USE SIMULATION METHOD TO CHECK Click here

    DTC C1427 is output

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here