DTC C0273/13 Open in ABS Motor Relay Circuit; DTC C0274/14 Short to B+ in ABS Motor Relay Circuit: Description

WARNING: This page is about a different car, the 2009 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

The ABS motor relay supplies power to the ABS pump motor. While the ABS is activated, the ECU turns the motor relay on and operates the ABS pump motor.

If the voltage supplied to the motor relay (+BM) is below the DTCs detection threshold due to low voltage from the battery or alternator, these DTCs may be stored.

DTC DETECTION CONDITION CHART

DTC Code	DTC Detection Condition	Trouble Area
C0273/13	Either of the following is detected: All of the following conditions continue for 0.1 seconds or more. The IG1 terminal voltage is 9.5 V or more. While initial check, or ABS or BA is operating. Relay contact is open when the relay is ON. Both of the following conditions continue for 0.1 seconds. The IG1 terminal voltage is less than 9.5 V. Relay contact remains open when the relay is ON.	ABS NO. 1 fuse ABS motor relay circuit Brake actuator assembly (ABS motor relay)
C0274/14	When the motor relay is OFF, the motor relay remains closed for 4 seconds or more.	ABS motor relay circuit Brake actuator assembly (ABS motor relay)