ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C0278/11, C0279/12

DTC Code DTC Name
C0278/11 Open in ABS Solenoid Relay Circuit
C0279/12 Short to B+ in ABS Solenoid Relay Circuit

DESCRIPTION

This relay supplies power to each ABS solenoid. After the ignition switch is turned ON, if the initial check is OK, the relay goes on.

DTC No. DTC Detecting Condition Trouble Area
C0278/11

Conditions of 1 or 2 continue for 0.2 seconds or more.


  1. ECU IG1 terminal voltage is 9.5 V to 18.5 V, the solenoid relay is ON and the condition that the solenoid relay contact is OFF.

  2. By driving with the solenoid relay ON, ECU IG1 terminal voltage becomes less than 9.5 V and the solenoid relay contact does not become ON condition.

  • ABS solenoid relay

  • ABS solenoid relay circuit

  • Battery
C0279/12 Immediately after ECU IG1 terminal becomes ON, when the solenoid relay is OFF, and when the condition that the solenoid relay contact is ON has been continued for 0.2 seconds or more.

WIRING DIAGRAM

A01KFFQE01

INSPECTION PROCEDURE

Tech Tips

Start the inspection from step 1 in case of using the intelligent tester and start from step 2 in case of not using the intelligent tester.

PROCEDURE


  1. DO ACTIVE TEST OF INTELLIGENT TESTER (ABS SOLENOID RELAY OPERATION)


    1. Select the ACTIVE TEST mode on the intelligent tester.

    2. Check the operation sound of the ABS solenoid relay when operating it with the intelligent tester.

      OK
      The operation sound of the ABS solenoid relay should be heard.

    OK

    CHECK CONTINUITY (ABS SOLENOID RELAY - SKID CONTROL ECU) Click here

    NG

  2. CHECK TERMINAL VOLTAGE


    1. A01KFPCE02
      Text in Illustration
      *1 R/B No. 2

      Remove the ABS solenoid relay from R/B No. 2.

    2. Measure the voltage between terminal 5 of R/B No. 2 (for ABS solenoid relay) and body ground.

      OK
      Voltage: 10 - 14 V

    NG

    INSPECT FUSE (ABS 2 OF R/B No. 2) Click here

    OK

  3. INSPECT ABS SOLENOID RELAY


    1. A01KFSEE01

      Check continuity between each terminal of ABS solenoid relay.

      OK
      Terminals 1 and 2 Continuity (Reference value 115 Ω)
      Terminals 3 and 5 Open

    2. Apply battery positive voltage between terminals 1 and 2.

    3. A01KGZME02
      Text in Illustration
      *a Open
      *b Continuity

      Check continuity between terminals 3 and 5 of ABS solenoid relay.

      OK
      Terminals 3 and 5 Continuity

    NG

    REPLACE ABS SOLENOID RELAY

    OK

  4. CHECK CONTINUITY (ABS SOLENOID RELAY - SKID CONTROL ECU)


    1. Disconnect the 2 connectors from the skid control ECU.

      A01KFZUE02
      Text in Illustration
      *1 ABS MTR Relay *2 Skid control ECU
      *3 R/B No. 2 *4 Brake Actuator

    2. Check continuity between terminal 3 of R/B No. 2 (for ABS solenoid relay) and terminals S6 - 5, 6, 10, 11, 12, and S7 - 1 and 2 of skid control ECU.

      OK
      Continuity

    NG

    REPAIR OR REPLACE HARNESS OR BRAKE ACTUATOR

    OK

  5. CHECK HARNESS AND CONNECTOR (ABS SOLENOID RELAY - SKID CONTROL ECU)


    1. Check for open and short circuit in harness and connector between ABS solenoid relay and skid control ECU Click here.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK RECONFIRM DTC


    1. Check DTC on Click here.

      A Malfunction Code
      B Normal Code

    B

    NO PROBLEM

    A

  7. CHECK CONTACT CONDITION


    OK

    CHECK AND REPLACE SKID CONTROL ECU ASSEMBLY

    NG

    CHECK AND REPAIR HARNESS AND CONNECTOR

  8. INSPECT FUSE (ABS 2 OF R/B No. 2)


    1. A01KHUIE02
      Text in Illustration
      *1 R/B No. 2
      *2 ABS2

      Remove ABS2 fuse from the R/B No. 2.

    2. Check continuity of ABS2 fuse.

      OK
      Continuity

    NG

    REPLACE FUSE

    OK

    CHECK AND REPAIR HARNESS OR CONNECTOR