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

The ABS solenoid relay supplies power to the ABS solenoid.

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

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.

DTC Code DTC Detection Condition Trouble Area
C0278/11

When either of the following is detected:


  1. When IG1 terminal voltage is 20 to 32 V, the relay contact is OFF (AST terminal voltage is less than 4.8 V) for 0.2 seconds or more.

  2. IG1 terminal voltage lowers due to turning the relay ON, and the relay contact is not ON for 0.2 seconds or more.

  • ABS SOL fuse

  • ABS SOL MAIN relay

  • ABS SOL MAIN relay circuit

  • Skid control ECU
C0279/12 Immediately after the ignition switch is turned to the ON position, the solenoid relay contact is closed (AST terminal voltage is 4.8 V or more) for 0.2 seconds when the relay is turned off.

  • ABS SOL fuse

  • ABS SOL MAIN relay

  • ABS SOL MAIN relay circuit

  • Skid control ECU

WIRING DIAGRAM

Refer to DTCs C0226/21, C0236/22, C0246/23, C0256/24 and C1227/27 Click here.

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT ABS SOL FUSE


    1. A01CHV0E02

      Remove the ABS SOL fuse from the No. 2 relay block.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      ABS SOL (30 A) fuse Always Below 1 Ω

    NG

    REPLACE ABS SOL FUSE

    OK

  2. INSPECT ABS SOLENOID RELAY (ABS SOL MAIN)


    1. A01CGMXE05

      Install the ABS SOL fuse.

    2. Remove the ABS SOL MAIN relay.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      3 - 5 Voltage is not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Apply the battery voltage between terminals 1 and 2 Below 1 Ω

    NG

    REPLACE ABS SOLENOID RELAY (ABS SOL MAIN)

    OK

  3. INSPECT NO. 2 RELAY BLOCK (POWER SOURCE TERMINAL)


    1. A01CGVLE01

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

      Standard voltage
      Tester Connection Condition Specified Condition
      ABS SOL MAIN relay terminal 5 - Body ground Always 20 to 32 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  4. INSPECT BRAKE ACTUATOR ASSEMBLY


    1. A01CJDQE03

      Disconnect the brake actuator connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      16 (BS) - 10 (AST) Always Below 1 Ω
      10 (AST) - Body ground Always 10 kΩ or higher

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR - NO. 2 RELAY BLOCK)


    1. A01CIU8E01

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S22-16 (BS) - ABS SOL MAIN relay terminal 3 Always Below 1 Ω
      S22-16 (BS) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE ACTUATOR)


    1. A01CJHCE01

      Disconnect the skid control ECU connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S11-6 (AST) - S22-10 (AST) Always Below 1 Ω
      S11-6 (AST) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - NO. 2 RELAY BLOCK)


    1. A01CH7JE01

      Disconnect the skid control ECU connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S14-1 (R+) - ABS SOL MAIN relay terminal 2 Always Below 1 Ω
      S14-1 (R+) - Body ground Always 10 kΩ or higher
      S14-24 (SR) - ABS SOL MAIN relay terminal 1 Always Below 1 Ω
      S14-24 (SR) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. RECONFIRM DTC


    1. Clear the DTC (See Pub. No. RM1008E, page 05-195).

    2. Start the engine.

    3. Drive the vehicle at a speed of 20 km/h (12 mph) or more for 30 seconds or more.

    4. Check if the same DTC is recorded (See Pub. No. RM1008E, page 05-195).

      Tech Tips

      Reinstall the relays, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

      Result
      Result Proceed to
      DTCs (C0278/11 and/or C0279/12) are not output A
      DTCs (C0278/11 and/or C0279/12) are 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 harness, and fuses of the skid control ECU and brake actuator assembly. Make sure that no DTCs are output.

      • If any DTCs are output while jiggling a connector or wire harness of the skid control ECU and brake actuator assembly, 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 SKID CONTROL ECU

    A

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here