VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C0278 and C0279

DTC Code DTC Name
C0278 Open in ABS Solenoid Relay Circuit
C0279 Short in ABS Solenoid Relay Circuit

DESCRIPTION

The solenoid relay is built into the master cylinder solenoid.

This relay supplies power to each solenoid. If the initial check is OK, after the engine switch is turned on (IG), the relay turns on.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C0278

Open in ABS Solenoid Relay Circuit

Either condition is met:

  1. Both of the following conditions continue for at least 0.2 seconds.

    1. IG voltage is between 9.5 and 17 V.

    2. The relay contact is open when the relay is on.

  3. Both of the following conditions continue for at least 0.2 seconds.

    1. IG voltage is 9.5 V or less when the relay is on.

    2. The relay contact remains open.

  • ABS NO. 2 fuse

  • Solenoid relay circuit

  • Master cylinder solenoid

C0279

Short in ABS Solenoid Relay Circuit

The following condition continues for at least 0.2 seconds.

  • The relay contact is closed immediately after turning the engine switch on (IG) when the relay is off.

  • ABS NO. 2 fuse

  • Solenoid relay circuit

  • Master cylinder solenoid

WIRING DIAGRAM

Refer to DTCs C0226, C0236, C0246, C0256, C1225, C1226, C1227 and C1228 (Click here).

CAUTION / NOTICE / HINT

Note:

  • When replacing the master cylinder solenoid, perform calibration (Click here).

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

PROCEDURE

  1. CHECK TERMINAL VOLTAGE (+BS)

    1. Disconnect the A7 skid control ECU connector.

    2. C214161C01

      *a

      Front view of wire harness connector

      (to Skid Control ECU)

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A7-31 (+BS) - Body ground

      Always

      11 to 14 V

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (GND1, GND2, AND GND3 TERMINAL)

    1. Disconnect the A7 and A8 skid control ECU connectors.

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

      Table 1. Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A7-1 (GND1) - Body ground

      Always

      Below 1 Ω

      A7-32 (GND2) - Body ground

      Always

      Below 1 Ω

      A8-4 (GND3) - Body ground

      Always

      Below 1 Ω

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. RECONFIRM DTC

    Tip:

    These codes are stored when a problem is detected in the master cylinder solenoid.

    The solenoid relay is in the master cylinder solenoid.

    Therefore, solenoid relay circuit inspections and relay unit inspections cannot be performed. Be sure to check if any DTC is output before replacing the master cylinder solenoid.

    1. Clear the DTCs.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Drive the vehicle at a speed of approximately 32 km/h (20 mph) or more for 60 seconds or more.

    3. Check if the same DTCs are output.

      Click here

      Tip:

      Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

      Result

      Result

      Proceed to

      DTC is not output

      A

      DTC is output

      B

      Chassis > ABS/VSC/TRC > Trouble Codes

    A

    USE SIMULATION METHOD TO CHECK

    Click here

    B

    REPLACE MASTER CYLINDER SOLENOID

    Click here