Dtc C0278/11 Open In Abs Solenoid Relay Circuit

Brake. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Brake Control. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT FUSE (ABS2)

CHECK WIRE HARNESS (SKID CONTROL ECU - BATTERY AND BODY GROUND)

RECONFIRM DTC

DTC C0278/11 Open in ABS Solenoid Relay Circuit

DTC C0279/12 Short to B+ in ABS Solenoid Relay Circuit


DESCRIPTION

The solenoid relay supplies power to the ABS solenoid.
After the ignition switch is turned on, the vehicle speed has reached 6 km/h (4 mph) and the solenoid is determined to be normal by the initial check self-diagnosis, the relay switches on. If open circuit is detected, the relay switches off.
These DTCs may be set if the voltage supply to the solenoid relay (+BS) falls below the DTC detection threshold due to the battery or alternator outputs being insufficient.

DTC No.
DTC Detection Condition
Trouble Area
C0278/11
When either condition below is met:
  1. Both of following conditions continue for 0.2 seconds or more.
    1. IG1 terminal voltage between 9.5 V and 18.5 V.
    2. Solenoid relay contact open when relay on.
  2. Both of following conditions continue for 0.2 seconds or more.
    1. IG1 terminal voltage becomes lower than 9.5 V when relay turned on.
    2. Relay contact remains open.
  1. ABS2 fuse
  2. Harness or connector (+BS circuit)
  3. Brake actuator (Skid control ECU)
C0279/12
Immediately after ignition switch turned on, solenoid relay contact closed for 0.2 seconds or more when relay off.
  1. ABS2 fuse
  2. Harness or connector (+BS circuit)
  3. Brake actuator (Skid control ECU)
HINT:
C0278/11 and C0279/12: The skid control ECU begins to detect these DTCs when the vehicle speed exceeds 6 km/h (4 mph).

WIRING DIAGRAM

Refer to DTC C0226/21, C0236/22, C0246/23, C0256/24 (RAV4_ACA30 RM000000OS902HX_02.html).

INSPECTION PROCEDURE

1.INSPECT FUSE (ABS2)

  1. Remove the ABS2 fuse from the engine room No. 1 relay block.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1 Ω


NG
REPLACE FUSE
OK


2.CHECK WIRE HARNESS (SKID CONTROL ECU - BATTERY AND BODY GROUND)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Brake Control.Anti-Lock Brake System. Dtc C0278/11 Open In Abs Solenoid Relay Circuit

  1. Disconnect the A27 ECU connector.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    A27-1 (+BS) - Body ground
    		11 to 14 V

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    A27-2 (GND1) - Body ground
    		Below 1 Ω
    A27-24 (GND2) - Body ground
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3.RECONFIRM DTC

  1. Clear the DTCs (RAV4_ACA30 RM000000ONJ02UX.html).

  1. Start the engine.

  1. Drive the vehicle at 6 km/h (4 mph) or more to activate the initial check.

  1. Check if the same DTC(s) is output (RAV4_ACA30 RM000000ONJ02UX.html).

    Result
    Result
    		Proceed to
    DTC is output
    		A
    DTC is not output
    		B


B
USE SIMULATION METHOD TO CHECK (RAV4_ACA30 RM00000135201PX.html)
A

REPLACE BRAKE ACTUATOR ASSEMBLY (RAV4_ACA30 RM000001XV200OX.html)