ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C0278/11

DTC Code DTC Name
C0278/11 Open or Short Circuit in ABS Solenoid Relay Circuit

DESCRIPTION

The solenoid relay supplies power to the ABS solenoid.

After the ignition switch is turned ON, when the vehicle speed reaches 5 km/h (3 mph) and the solenoid is determined to be normal by the initial check self-diagnosis, the relay switches ON. If any open or short circuits are detected, the relay switches OFF.

This DTC may be set if the voltage supply to the solenoid relay (+BS) falls below the DTC detection threshold due to the battery or alternator outputs being insufficient.

DTC No. DTC Detecting Conditions Trouble Areas
C0278/11

When any of following (1 to 3) detected:

1. ECU internal circuit malfunction.

2. Solenoid relay voltage remains below 80% of IG1 source voltage for 0.5 seconds or more, despite skid control ECU signaling solenoid relay to turn ON.

3. Solenoid power supply voltage high, despite skid control ECU signaling solenoid relay to turn OFF.

  • ABS NO. 2 fuse

  • Wire harness (+BS)

  • Brake actuator

Tech Tips

C0278/11: The skid control ECU begins to detect this DTC when the vehicle speed exceeds 5 km/h (3 mph).

WIRING DIAGRAM

Click here.

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT FUSE (ABS NO. 2)


    1. A0137HYE01

      Remove the ABS NO. 2 fuse from the engine room R/B and J/B.

    2. Measure the resistance.

      Standard Resistance
      Below 1 Ω

    NG

    CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE

    OK

  2. CHECK HARNESS AND CONNECTOR (BATTERY - SKID CONTROL ECU - BODY GROUND)


    1. Inspect the skid control ECU connector fitting for any defects.

    2. Disconnect the skid control ECU connector.

    3. Inspect both the connector case and the terminal for deformation and corrosion.

      OK
      No deformation or corrosion.
    4. A0135VYE01

      Measure the voltage.

      Standard Voltage
      Tester Connection Specified Condition
      A21-3 (+BS) - Body ground 10 to 14 V

    5. Measure the resistance.

      Standard Resistance
      Tester Connection Specified Condition
      A21-4 (GND1) - Body ground Below 1 Ω
      A21-1 (GND2) - Body ground Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  3. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Turn the ignition switch off and then drive the vehicle at 5 km/h (3 mph) or more to activate the initial check.

    3. Check if the same DTC is output.

      Result
      DTC (C0278/11) output A
      DTC not output B

    B

    END

    A

    REPLACE BRAKE ACTUATOR