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 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.

If the voltage supplied to the motor relay (+BM) is below the DTCs detection threshold due to low voltage from the battery or generator, the 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 actuated, voltage is not supplied to the pump motor within 0.08 seconds.

  2. When the motor relay is not actuated, 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. After the 3rd time, the pump motor becomes inoperative due to open circuit.

  • VSC NO. 1 fuse

  • ABS motor relay circuit

  • Brake actuator assembly (ABS motor relay)

WIRING DIAGRAM

A0136ZOE01

INSPECTION PROCEDURE

Tech Tips

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

PROCEDURE


  1. INSPECT VSC NO. 1 FUSE


    1. A01374CE01

      Remove the VSC NO. 1 fuse from the engine room relay block.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      VSC NO. 1 (50 A) fuse Always Below 1 Ω

    NG

    REPLACE VSC NO. 1 FUSE

    OK

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


    1. Install the VSC NO. 1 fuse.

    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
      ABS Motor Relay ABS motor relay Relay ON / OFF Operating sound of motor can be heard

    5. Check the operating sound of the ABS 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

  3. INSPECT SKID CONTROL ECU (+BM TERMINAL)


    1. A0136MKE29

      Turn the ignition switch to 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
      A41-2 (+BM) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (+BM CIRCUIT)

    OK

  4. INSPECT SKID CONTROL ECU (GND TERMINAL)


    1. A0136MKE30

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A41-4 (GND1) - Body ground Always Below 1 Ω
      A41-1 (GND2) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

  5. RECONFIRM DTC

    Tech Tips

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

    The ABS motor relay is in the brake actuator assembly.

    Therefore, ABS motor relay 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 to OFF.

    2. Reconnect the skid control ECU connector.

    3. Clear the DTC 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.

      Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTC not output A
      DTC 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 (the trouble code is not 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 brake actuator assembly (skid control ECU), inspect and repair the connector or wire harness.

      • It is suspected that the DTCs were output due to a bad connection of the connector terminal.


    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here