ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C0273/13, C0274/14

DTC Code DTC Name
C0273/13 Open in ABS Motor Relay Circuit
C0274/14 Short to B+ in ABS Motor Relay Circuit

DESCRIPTION

While the ABS is operating, the skid control ECU turns the ABS MTR MAIN relay on and activates the pump motor in the brake actuator.

These codes may be stored if the motor relay (BM) voltage becomes lower than a specified level due to insufficient output from the battery or alternator.

DTC Code DTC Detection Condition Trouble Area
C0273/13

When either of the following is detected:


  1. When IG1 terminal voltage is 20 to 32 V, the relay contact is OFF (MT terminal voltage is less than 2 V) for 0.2 seconds or more.

  2. IG1 terminal voltage lowers due to turning the relay ON, and the relay contact is not ON for 0.2 seconds or more.

  • ABS fuse

  • ABS MTR MAIN relay

  • ABS MTR MAIN relay circuit

  • Brake actuator assembly

  • Skid control ECU
C0274/14

When either of the following is detected:


  1. When the relay is OFF, the relay contact is ON (MT terminal voltage is 2 V or more) for 4 seconds or more.

  2. When the relay is OFF, an open in the MT terminal continues for 4 seconds or more.

  • ABS fuse

  • ABS MTR MAIN relay

  • ABS MTR MAIN relay circuit

  • Brake actuator assembly

  • Skid control ECU

WIRING DIAGRAM

A01CIYQE01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT ABS FUSE


    1. A01CHV0E01

      Remove the ABS fuse from the No. 2 relay block.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      ABS (50 A) fuse Always Below 1 Ω

    NG

    REPLACE ABS FUSE

    OK

  2. INSPECT ABS MOTOR RELAY (ABS MTR MAIN)


    1. A01CGMXE04

      Install the ABS fuse.

    2. Remove the ABS MTR MAIN relay.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      3 - 5 Voltage is not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Apply the battery voltage between terminals 1 and 2 Below 1 Ω

    NG

    REPLACE ABS MOTOR RELAY (ABS MTR MAIN)

    OK

  3. INSPECT NO. 2 RELAY BLOCK (POWER SOURCE TERMINAL)


    1. A01CI4JE01

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

      Standard voltage
      Tester Connection Condition Specified Condition
      ABS MTR MAIN relay terminal 5 - Body ground Always 20 to 32 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  4. INSPECT BRAKE ACTUATOR ASSEMBLY


    1. A01CJDQE02

      Disconnect the brake actuator connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      2 (BM) - 3 (MT) Always 31.3 to 34.7 Ω
      3 (MT) - Body ground Always 10 kΩ or higher

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR - NO. 2 RELAY BLOCK)


    1. A01CHN2E01

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S22-2 (BM) - ABS MTR MAIN relay terminal 3 Always Below 1 Ω
      S22-2 (BM) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE ACTUATOR)


    1. A01CHAFE01

      Disconnect the skid control ECU connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S14-18 (MT) - S22-3 (MT) Always Below 1 Ω
      S14-18 (MT) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - NO. 2 RELAY BLOCK)


    1. A01CJ53E01

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S14-12 (MR) - ABS MTR MAIN relay terminal 2 Always Below 1 Ω
      S14-12 (MR) - Body ground Always 10 kΩ or higher
      S14-1 (R+) - ABS MTR MAIN relay terminal 1 Always Below 1 Ω
      S14-1 (R+) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. RECONFIRM DTC


    1. Clear the DTC (See Pub. No. RM1008E, page 05-195).

    2. Start the engine.

    3. Drive the vehicle at a speed of 20 km/h (12 mph) or more for 30 seconds or more.

    4. Check if the same DTC is recorded (See Pub. No. RM1008E, page 05-195).

      Tech Tips

      Reinstall the relays, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

      Result
      Result Proceed to
      DTCs (C0273/13 and/or C0274/14) are not output A
      DTCs (C0273/13 and/or C0274/14) 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 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 skid control ECU and brake actuator assembly. Make sure that no DTCs are output.

      • If any DTCs are output while jiggling a connector or wire harness of the skid control ECU and brake actuator assembly, 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 SKID CONTROL ECU

    A

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here