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 ABS solenoid relay supplies power to the ABS solenoid and TRC 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 ABS 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 faulty solenoids at the same time.

  2. Solenoid valve relay is not turned OFF.

  • VSC NO. 2 fuse

  • ABS solenoid relay circuit

  • Brake actuator assembly (ABS solenoid relay)

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

Tech Tips

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

PROCEDURE


  1. INSPECT VSC NO. 2 FUSE


    1. A01374CE02

      Remove the VSC NO. 2 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
      VSC NO. 2 (30 A) fuse Always Below 1 Ω

    NG

    REPLACE VSC NO. 2 FUSE

    OK

  2. INSPECT SKID CONTROL ECU (+BS TERMINAL)


    1. A0136MKE31

      Install the VSC NO. 2 fuse.

    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
      A41-3 (+BS) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (+BS CIRCUIT)

    OK

  3. INSPECT SKID CONTROL ECU (GND TERMINAL)


    1. A0136MKE30

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A41-4 (GND1) - Body ground Always Below 1 Ω
      A41-1 (GND2) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

  4. 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 recorded Click here.

      Result
      Result Proceed to
      DTC not output A
      DTC 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 harnesses, 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 (SYMPTOM SIMULATION) Click here