Dtc C0278/11 Open In Abs Solenoid Relay Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT SKID CONTROL ECU (+BS TERMINAL)

INSPECT SKID CONTROL ECU (GND TERMINAL)

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 solenoids.
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 the self diagnosis performed when the vehicle starts running.
The 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 condition below is met:
  1. Both of the following conditions continue for 0.2 seconds or more.
    1. The IG1 terminal voltage is 9.5 V or more.
    2. The solenoid relay contact is open when the relay is ON.
  2. Both of the following conditions continue for 0.2 seconds or more.
    1. The IG1 terminal voltage becomes lower than 9.5 V or less when the relay is turned on.
    2. The relay contact remains open.
  1. ABS NO. 2 fuse
  2. Solenoid relay circuit
  3. Brake actuator assembly (Solenoid relay)
C0279/12
Immediately after the ignition switch is turned to ON, the solenoid relay contact is closed for 4 seconds when the relay is turned off.
  1. Solenoid relay circuit
  2. Brake actuator assembly (Solenoid relay)

WIRING DIAGRAM

Refer to DTCs C0226/21, C0236/22, C0246/23, C0256/24 and C1225/25 (Toyota Fortuner RM000000XI8094X_02.html).

INSPECTION PROCEDURE

NOTICE:
  1. When replacing the brake actuator assembly, perform zero point calibration (Toyota Fortuner RM000000XHR02TX.html).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
When C1241/41 is output together with C0278/11 and/or C0279/12, inspect and repair the trouble areas indicated by C1241/41 first (Toyota Fortuner RM000000XW609JX.html).
1.INSPECT SKID CONTROL ECU (+BS TERMINAL)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control System. Dtc C0278/11 Open In Abs Solenoid Relay Circuit

  1. Disconnect the skid control ECU connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    S25-12 (+BS) - Body ground
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (+BS CIRCUIT)
OK


2.INSPECT SKID CONTROL ECU (GND TERMINAL)

  1. Disconnect the skid control ECU connector.



    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control System. Dtc C0278/11 Open In Abs Solenoid Relay Circuit

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    S25-1 (GND1) - Body ground
    		Always
    		Below 1 Ω
    S25-13 (GND2) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
OK


3.RECONFIRM DTC
HINT:
These codes are detected when a problem is identified in the brake actuator assembly.
The solenoid circuit is in the brake actuator assembly.
Therefore, solenoid circuit inspection and solenoid unit inspection cannot be performed. Be sure to check if a DTC is output before replacing the brake actuator assembly.

  1. Clear the DTC(s) (Toyota Fortuner RM000000XHV09NX.html).

  1. Start the engine.

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

  1. Check if the same DTC is recorded (Toyota Fortuner RM000000XHV09NX.html).

    Result
    Result
    		Proceed to
    DTC not output
    		A
    DTC output
    		B
    HINT:
    1. 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.
    2. If the normal system code is output (a 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.
    3. 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.
    4. The DTCs may be output due to a bad connection at the connector terminal.


B
REPLACE BRAKE ACTUATOR ASSEMBLY
A

USE SIMULATION METHOD TO CHECK