VEHICLE STABILITY CONTROL 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 solenoid.

The solenoid relay is turned on 1.5 seconds after the ignition switch is turned to ON, and is turned off if an open or short in the solenoid is detected by self diagnosis performed when the vehicle starts running.

The solenoid relay is housed in the skid control ECU in the brake actuator assembly.

DTC Code DTC Detection Condition Trouble Area
C0278/11

When either of the following is detected:


  1. 3 or more solenoid valves are determined to be faulty and voltage supplied to the solenoid is determined to be faulty at the same time.

  2. Solenoid valve relay is not turned off.

  • ABS NO. 2 fuse

  • Solenoid relay circuit

  • Brake actuator assembly

WIRING DIAGRAM

Refer to DTCs C0226/21, C0236/22, C0246/23, C0256/24, C1225/25, C1226/26, C1227/27 and C1228/28 Click here.

INSPECTION PROCEDURE

Note


  • When replacing the skid control ECU (brake actuator assembly), perform the engine variant learning Click here.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips

When DTC C1241/41 is output together with DTC C0278/11, inspect and repair the trouble areas indicated by DTC C1241/41 first Click here.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (+BS TERMINAL)


    1. Turn the ignition switch off.

    2. Disconnect the skid control ECU connector.

    3. A005SDCE05
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)
      *2 for A/T or M/T
      *3 for CVT

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A42 or A43-3 (+BS) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)


    1. Turn the ignition switch off.

    2. Disconnect the skid control ECU connector.

    3. A005SDCE17
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)
      *2 for A/T or M/T
      *3 for CVT

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A42 or A43-4 (GND1) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. RECONFIRM DTC

    Tech Tips

    This code is stored when a problem is identified in the brake actuator assembly.

    The solenoid circuit is located in the brake actuator assembly.

    Therefore, solenoid circuit inspection and solenoid unit inspection cannot be performed. Be sure to check if the DTC is output before replacing the brake actuator assembly.


    1. Reconnect the skid control ECU connector.

    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.

    5. Check if the same DTC is output Click here.

      Result
      Result Proceed to
      DTC C0278/11 is not output. A
      DTC C0278/11 is 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 (a trouble code is not output), slightly jiggle the connector, wire harness, and fuses of the brake actuator assembly. Make sure that no DTCs are output.

      • If any DTCs are stored while jiggling a connector or wire harness of the brake actuator assembly (skid control ECU), inspect and repair the connector or wire harness.

      • The DTC may be stored due to a bad connection at the connector terminal.


    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    USE SIMULATION METHOD TO CHECK Click here