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VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C0273/13

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DTC Code DTC Name
C0273/13 Open or Short Circuit in ABS Motor Relay Circuit
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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 No. 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. At the 3rd time, the pump motor becomes inoperative due to open circuit.

  • ABS NO. 1 fuse

  • ABS motor relay circuit

  • Brake actuator assembly (ABS motor relay)
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Tip:

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

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PROCEDURE


  1. Click here

    INSPECT ABS NO. 1 FUSE


    1. A01CAUTE03

      Remove the ABS 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
      ABS NO. 1 (50 A) fuse Always Below 1 Ω

  2. Click here

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ABS MOTOR RELAY)


    1. Install the ABS 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).

      Table 1. 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

    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

  3. Click here

    INSPECT SKID CONTROL ECU (+BM TERMINAL)


    1. A01CFJZE46

      Turn the engine 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
      A10-2 (+BM) - Body ground Always 11 to 14 V

  4. Click here

    INSPECT SKID CONTROL ECU (GND TERMINAL)


    1. A01CFJZE47

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A10-1 (GND1) - Body ground Always Below 1 Ω
      A10-1 (GND2) - Body ground Always Below 1 Ω

  5. Click here

    RECONFIRM DTC

    Tip:

    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 engine switch 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 (C0273/13) is not output A
      DTC (C0273/13) is output B
      Tip:

      • If a speed signal of 40 km/h (25 mph) or more is input to the skid control ECU, with the engine switch on (IG) 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.


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    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)Click here

  7. Click here

    REPLACE ABS NO. 1 FUSE

  8. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (+BM CIRCUIT)

  9. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

  10. Click here

    REPLACE BRAKE ACTUATOR ASSEMBLYClick here