VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C0273, C0274, C1361

DTC Code DTC Name
C0273 Open in ABS Motor Relay Circuit
C0274 Short in ABS Motor Relay Circuit
C1361 Short in ABS Motor Fail Safe 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, these DTCs may be stored.

DTC Code DTC Detection Condition Trouble Area
C0273

Either of the following is detected:


  1. All of the following conditions continue for 0.1 seconds or more.


    • The IG1 terminal voltage is between 9.5 and 17.2 V.

    • During initial check, or ABS, BA, TRC or VSC is operating.

    • Relay contact remains open when the relay is ON.

  2. Both of the following conditions continue for 0.1 seconds or more.


    • The IG1 terminal voltage is less than 9.5 V.

    • Relay contact remains open when the relay is ON.

  • ABS1 fuse

  • ABS motor relay circuit

  • Brake actuator assembly (ABS motor relay)
C0274 When the motor relay is OFF, the motor relay remains closed for 4 seconds or more.

  • ABS motor relay circuit

  • Brake actuator assembly (ABS motor relay)
C1361 Immediately after the engine switch is turned on (IG), the relay contact is closed for 4 seconds when the motor fail safe relay is OFF.

  • ABS1 fuse

  • ABS motor fail safe relay circuit

  • Brake actuator assembly (ABS motor fail safe relay)

WIRING DIAGRAM

A01625RE03

INSPECTION PROCEDURE

Note

When replacing the brake actuator assembly, perform zero point calibration and store system information Click here.

Tech Tips

When DTC C1241 and/or C1417 is output together with DTC C0273, C0274 and/or C1361, inspect and repair the trouble areas indicated by DTC C1241 and/or C1417 first Click here, or Click here.

PROCEDURE


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


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine.

    3. Select the Active Test on the intelligent tester 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 for operating sound of the ABS motor relay when operating it using the intelligent tester.

      Result
      Result Proceed to
      Operating sound is not heard A
      Operating sound is heard B

    B

    RECONFIRM DTC Click here

    A

  2. INSPECT ABS1 FUSE


    1. A015YJIE05
      Text in Illustration
      *1 No. 1 Engine Room Relay Block
      *2 for LHD
      *3 for RHD
      *4 ABS1 Fuse

      Turn the engine switch off.

    2. Remove the ABS1 fuse from the No. 1 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ABS1 (50 A) fuse Always Below 1 Ω

    NG

    REPLACE ABS1 FUSE

    OK

  3. INSPECT SKID CONTROL ECU (+BM TERMINAL)


    1. A0160DRE03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)

      Install the ABS1 fuse.

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

    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
      A62-24 (+BM) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (+BM CIRCUIT)

    OK

  4. INSPECT SKID CONTROL ECU (GND2 TERMINAL)


    1. A0160DRE04
      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
      A62-13 (GND2) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT)

    OK

  5. 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 engine 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 recorded Click here.

      Result
      Result Proceed to
      DTCs (C0273, C0274 and C1361) are not output A
      DTCs (C0273, C0274 and/or C1361) are 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 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 (no trouble codes are 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