ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1427

DTC Code DTC Name
C1427 Malfunction in Motor

DESCRIPTION

When the power switch is on (READY), the stop light switch assembly off and the vehicle speed is 20 km/h (12 mph) or more, the skid control ECU (brake booster with master cylinder assembly) performs a self-diagnosis of the ABS motor relay circuit during the initial check of the actuator.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1427 Malfunction in Motor 1159 The pump motor built into the brake actuator assembly is not operating correctly.

  • Wire harness or connector

  • Pump motor or pump motor circuit built into the brake actuator assembly

 Electronically controlled brake system DTC

WIRING DIAGRAM

B004PUGE01

CAUTION / NOTICE / HINT

Note


  • After replacing the skid control ECU (brake booster with master cylinder assembly) or brake actuator assembly, perform linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization after performing "Reset Memory".

    Click here

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (ABS MOTOR RELAY)


    1. Select the Active Test on the GTS.


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

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

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

      Result
      Result Proceed to
      The operating sound is heard. A
      The operating sound is not heard. B

    B

    CONFIRM MODEL Click here

    A

  2. CLEAR DTC


    1. Clear the DTCs.


      Chassis > ABS/VSC/TRC > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  3. RECONFIRM DTC


    1. Turn the power switch off.

    2. Turn the power switch on (READY).

    3. Perform a road test.

    4. Check if the same DTC is output.


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

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for LHD: Click here
    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for RHD: Click here

  4. CONFIRM MODEL


    1. Choose the model to be inspected.

      Result
      Result Proceed to
      for LHD A
      for RHD B

    B

    CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) Click here

    A

  5. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)


    1. Turn the power switch off.

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

      OK
      The connector is securely connected.

    3. Disconnect the A41 skid control ECU (brake booster with master cylinder assembly) connector.

    4. Disconnect the A42 brake actuator assembly connector.

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

      OK
      No deformation or corrosion.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A41-40 (+BM) - A42-13 (+BM) Always Below 1 Ω
      A41-40 (+BM) or A42-13 (+BM) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (GND TERMINAL)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A42-1 (MGND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

  7. CLEAR DTC


    1. Reconnect the A41 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Reconnect the A42 brake actuator assembly connector.

    3. Clear the DTCs.


      Chassis > ABS/VSC/TRC > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  8. RECONFIRM DTC


    1. Turn the power switch off.

    2. Turn the power switch on (READY).

    3. Perform a road test.

    4. Check if the same DTC is output.


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

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  9. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)


    1. Turn the power switch off.

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

      OK
      The connector is securely connected.

    3. Disconnect the A41 skid control ECU (brake booster with master cylinder assembly) connector.

    4. Disconnect the A43 brake actuator assembly connector.

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

      OK
      No deformation or corrosion.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A41-40 (+BM) - A43-13 (+BM) Always Below 1 Ω
      A41-40 (+BM) or A43-13 (+BM) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (GND TERMINAL)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A43-1 (MGND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

  11. CLEAR DTC


    1. Reconnect the A41 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Reconnect the A43 brake actuator assembly connector.

    3. Clear the DTCs.


      Chassis > ABS/VSC/TRC > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  12. RECONFIRM DTC


    1. Turn the power switch off.

    2. Turn the power switch on (READY).

    3. Perform a road test.

    4. Check if the same DTC is output.


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

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here