VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C0273/13

DTC Code DTC Name
C0273/13 Open or Short Circuit in ABS Motor Relay Circuit

DESCRIPTION

The motor relay supplies power to the pump motor. While the brake control system is activated, the skid control ECU turns the motor relay on and operates the pump motor.

If the voltage supplied to the motor relay (+BM) is below the malfunction threshold due to low voltage from the battery or alternator, a DTC may be stored.

DTC Code DTC Detection Condition Trouble Area
C0273/13

When any of the following is detected:


  1. When the motor relay is activated, voltage is not supplied to the pump motor within 0.08 seconds.

  2. When the motor relay is not activated, voltage in the pump motor is high for 2.5 seconds or more.

  3. Voltage in the pump motor is low for 0.04 seconds or more and the pump is activated for 0.7 seconds 3 times. At the 3rd time, the pump motor becomes inoperative due to an open circuit.

  • ABS NO. 1 fuse

  • Motor relay circuit

  • Brake actuator assembly

WIRING DIAGRAM

A003C3FE04

INSPECTION PROCEDURE

Note


  • When replacing the skid control ECU (brake actuator assembly), perform the engine variant learning Click here.

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

Tech Tips

When DTC C1241/41 is output together with DTC C0273/13, inspect and repair the trouble areas indicated by DTC C1241/41 first Click here.

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (MOTOR RELAY)


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine.

    4. Select the Active Test mode on the intelligent tester Click here.

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

    5. Check the operating sound of the motor relay when operating it with the intelligent tester.

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

    B

    RECONFIRM DTC Click here

    A

  2. CHECK HARNESS AND CONNECTOR (+BM TERMINAL)


    1. A003CIYE08
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)

      Turn the ignition switch off.

    2. Disconnect the skid control ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A42-2 (+BM) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (GND2 TERMINAL)


    1. Turn the ignition switch off.

    2. Disconnect the skid control ECU connector.

    3. A003CIYE18
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A42-1 (GND2) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. RECONFIRM DTC

    Tech Tips

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

    The motor relay is in the brake actuator assembly.

    Therefore, motor relay circuit inspection and 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 skid control ECU connector.

    3. Clear the DTCs Click here.

    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 output Click here.

      Result
      Result Proceed to
      DTC C0273/13 is not output. A
      DTC C0273/13 is output. B

      Tech Tips


      • If a speed signal of 6 km/h (4 mph) or more is input to the skid control ECU 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 (a trouble code is not output), slightly jiggle the connector, wire harness, and fuses of the brake actuator assembly. Make sure that no DTCs are output.

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

      • The DTC may be stored due to a bad connection at the connector terminal.


    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    USE SIMULATION METHOD TO CHECK Click here