ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C0273/13, C0274/14

DTC Code DTC Name
C0273/13 Open in ABS Motor Relay Circuit
C0274/14 Short to B+ in ABS Motor Relay Circuit

DESCRIPTION

The ABS motor relay supplies power to the ABS pump motor. While the ABS is activated, the ECU turns the motor relay ON and operates the ABS pump motor.

DTC No. DTC Detection Condition Trouble Area
C0273/13

When either of following is detected:

1. Both conditions continue for at least 0.2 seconds


  • IG1 voltage is between 10 and 16 V

  • Relay contact is open when relay is ON

2. Both conditions continue for at least 0.2 seconds


  • IG1 voltage is 10 V or less

  • Relay contact remains open when relay is ON

  • Brake actuator assembly (ABS motor relay)

  • ABS motor relay circuit
C0274/14 Relay contact is closed when relay is OFF for at least 4 seconds

  • Brake actuator assembly (ABS motor relay)

  • ABS motor relay circuit

WIRING DIAGRAM

A01J5BSE02

INSPECTION PROCEDURE

PROCEDURE


  1. CHOOSE DIAGNOSIS METHOD


    1. Choose the diagnosis method.

      Method
      Method Proceed to
      Using intelligent tester A
      Not using intelligent tester B

    B

    INSPECT SKID CONTROL ECU CONNECTOR Click here

    A

  2. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (ABS MOTOR RELAY)


    1. Select the Active Test, generate a control command, and then check that the ABS motor relay operates.

      Skid control ECU
      Item Vehicle Condition / Test Details Diagnostic Note
      ABS Motor Relay Turns ABS motor relay ON / OFF Operation sound of motor can be heard
      OK
      Operation sound of ABS motor is heard.

    NG

    INSPECT FUSE (ALT, ABS NO. 1) Click here

    OK

  3. INSPECT SKID CONTROL ECU CONNECTOR


    1. Check the ECU connector's connecting condition.

      OK
      Connector is securely connected.

    NG

    CONNECT CONNECTOR TO ECU CORRECTLY

    OK

  4. RECONFIRM DTC

    Tech Tips

    These codes are output when a problem is detected in the brake actuator assembly.

    As the ABS motor relay is built into the brake actuator assembly, ABS motor relay and solenoid unit inspection cannot be performed.

    Be sure to check if the DTC is output before replacing the brake actuator assembly.


    1. Clear the DTCs.

    2. Drive the vehicle at 6 km/h (4 mph) or more.

    3. Check for DTCs.

      Result
      Result Proceed to
      DTC is output A
      DTC is not output B

    B

    END

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY

  5. INSPECT FUSE (ALT, ABS NO. 1)


    1. Remove the ALT and ABS NO. 1 H-fuses from the engine room junction block.

    2. Measure the resistance of the H-fuses.

      Standard resistance
      Below 1 Ω

    NG

    REPLACE FUSE

    OK

  6. CHECK WIRE HARNESS (SKID CONTROL ECU - BATTERY AND BODY GROUND)

    A01J3N2E01

    1. Disconnect the S2 ECU connector.

    2. Measure the voltage of the wire harness side connector.

      Standard voltage
      Tester Connection Specified Condition
      S2-23 (+BM) - Body ground 10 to 14 V

    3. Measure the resistance of the wire harness side connector.

      Standard resistance
      Tester Connection Specified Condition
      S2-2 (GND1) - Body ground Below 1 Ω
      S2-24 (GND2) - Body ground Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  7. RECONFIRM DTC

    Tech Tips

    These codes are output when a problem is detected in the brake actuator assembly.

    As the ABS motor relay is built into the brake actuator assembly, ABS motor relay and solenoid unit inspection cannot be performed.

    Be sure to check if the DTC is output before replacing the brake actuator assembly.


    1. Clear the DTCs.

    2. Drive the vehicle at 6 km/h (4 mph) or more.

    3. Check for DTCs.

      Result
      Result Proceed to
      DTC is output A
      DTC is not output B

    B

    END

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY