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 alternator, the DTC may be stored.

DTC Code DTC Detection Condition Trouble Area
C0273/13

Any of the following is detected:


  1. When the motor relay is actuated, voltage is not supplied to the pump motor.

  2. When the motor relay is not actuated, voltage in the pump motor is high.

  • Fusible link block (ABS NO. 1 fuse)

  • ABS motor relay circuit

  • Brake actuator assembly (ABS motor relay)

WIRING DIAGRAM

A01EMKME01

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. PERFORM ACTIVE TEST USING GTS (ABS MOTOR RELAY)


    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Select the Active Test on the GTS Click here.

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

    4. Check the operating sound of the ABS motor relay when operating it using the GTS.

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

    B

    INSPECT ABS NO. 1 FUSE Click here

    A

  2. RECONFIRM DTC

    Tech Tips

    This code is detected 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 off.

    2. Clear the DTCs Click here.

    3. Start the engine.

    4. 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 (C0273/13) is not output A
      DTC (C0273/13) is output B

      Tech Tips


      • If a speed signal of 15 km/h (9 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 Click here

  3. INSPECT ABS NO. 1 FUSE


    1. A01EJHEE01
      Text in Illustration
      *1 Engine Room Relay Block
      *2 Fusible Link Block
      *3 ABS NO. 1 Fuse

      Turn the ignition switch off.

    2. Remove the fusible link block from the engine room relay block.

    3. Check if the fusible link is melted.

      OK
      The fusible link is not melted.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ABS NO. 1 (50 A) fuse - Body ground Always Below 1 Ω

    NG

    REPLACE FUSIBLE LINK BLOCK (ABS NO. 1 FUSE)

    OK

  4. INSPECT SKID CONTROL ECU (+BM TERMINAL)


    1. A01EIZEE55
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Brake Actuator (Skid Control ECU))

      Install the fusible link block to the engine room relay block.

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

    3. Disconnect the skid control ECU connector.

    4. 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 (+BM CIRCUIT)

    OK

  5. INSPECT SKID CONTROL ECU (GND2 TERMINAL)


    1. A01EIZEE56
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Brake Actuator (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 (GND2 CIRCUIT)

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here