DTC C0278/11: Open in ABS Solenoid Relay Circuit; DTC C0279/12: Short to B+ in ABS Solenoid Relay Circuit: Description

The ABS solenoid relay supplies power to the ABS solenoid and TRAC solenoid.

The solenoid relay is turned on 1.5 seconds after the engine switch is turned on (IG), and is turned off if an open or short in the solenoid is detected by self diagnosis performed when the vehicle starts running. The ABS solenoid relay is housed in the skid control ECU in the actuator assembly.

HINT:

If a speed signal of 4 mph (6 km/h) or more is input to the skid control ECU, with the engine switch on (IG) and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits.

DETECTION ITEM CONDITION CHART

DTC No.	DTC Detection Condition	Trouble Area
C0278/11	When any of the following (1 or 2) is detected: All of the following conditions continue for 0.2 seconds or more. The IG1 terminal voltage is between 9.5 and 17.2 V. The solenoid relay contact is open when the relay is ON. All of the following conditions continue for 0.2 seconds or more. IG1 terminal voltage becomes lower than 9.5 V or less when the relay is turned on. The relay contact remains open.	ABS2 fuse ABS solenoid relay ABS solenoid relay circuit Brake actuator assembly
C0279/12	Immediately after the engine switch is turned on (IG), the solenoid relay contact is closed for 0.2 seconds when the relay is turned off.	Brake actuator assembly