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

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

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

HINT

If a speed signal of 6 km/h (4 mph) 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.

DTC DETECTION CONDITION

DTC Code	DTC Detection Condition	Trouble Area
C0278/11	Any of the following is detected All of the following conditions continue for 0 2 seconds or more The IG1 terminal voltage is between 9 5 and 18 5 V Relay contact is open (AST terminal voltage is less than 6 V) when the ABS solenoid relay is ON All of the following conditions continue for 0 2 seconds or more The IG1 terminal voltage becomes 9 5 V or less when the relay is turned on The relay contact remains open (AST terminal voltage is 6 V or more)	ABS3 fuse ABS SOL relay ABS SOL relay circuit Skid control ECU
C0279/12	Immediately after the engine switch is turned on (IG), the solenoid relay contact is closed (AST terminal voltage is 6 V or more) for 0 2 seconds when the ABS solenoid relay is OFF	ABS3 fuse ABS SOL relay ABS SOL relay circuit Skid control ECU