DTC C1311: Open Circuit in Main Relay 1; DTC C1312: Short Circuit in Main Relay 1; DTC C1313: Open Circuit in Main Relay 2; DTC C1314: Short Circuit in Main Relay 2 [08/2019 - 07/2020]: Description

The ABS main relay supplies power to the changeover solenoid and the linear solenoid.

The ABS main relay remains on for approximately 2 minutes after the power switch is turned off and the input of brake pedal operation signals stops, and supplies power to the system to keep it ready to operate.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	MIL	Note
C1311	Open Circuit in Main Relay 1	1	Either of the following is detected: The ABS main relay 1 contact is not turned ON (BS01 terminal voltage less than 3.5 V) for 0.2 seconds or more when the ABS main relay 1 ON is requested while +BI1 terminal voltage is 7.5 V or more. When terminal +BI1 voltage is less than 7.5 V and the ABS main relay 1 contact is not turned ON (BS01 terminal voltage 3.5 V or more) for 0.2 seconds or more when the ABS main relay 1 ON is requested.	Open or short in ABS main relay 1 circuit Skid control ECU assembly	Comes on	INF Code 1: SAE Code C12FA Electronically controlled brake system DTC
C1312	Short Circuit in Main Relay 1	3	The ABS main relay 1 contact is turned ON (BS01 terminal voltage 6.5 V or more) for 1 second or more when the ABS main relay 1 OFF is requested.	Short in ABS main relay 1 circuit ABS main relay 1 internal stuck Skid control ECU assembly	Comes on	INF Code 3: SAE Code C12FB Electronically controlled brake system DTC
C1313	Open Circuit in Main Relay 2	4	Either of the following is detected: The ABS main relay 2 contact is not turned ON (BS02 terminal voltage less than 3.5 V) for 0.2 seconds or more when the ABS main relay 2 ON is requested while +BI2 terminal voltage is 7.5 V or more. When terminal +BI2 voltage is less than 7.5 V and the ABS main relay 2 contact is not turned ON (BS02 terminal voltage 3.5 V or more) for 0.2 seconds or more when the ABS main relay 2 ON is requested.	Open or short in ABS main relay 2 circuit Skid control ECU assembly	Comes on	INF Code 4: SAE Code C130C Electronically controlled brake system DTC
C1314	Short Circuit in Main Relay 2	6	The ABS main relay 2 contact is turned ON (BS02 terminal voltage 6.5 V or more) for 1 second or more when the ABS main relay 2 OFF is requested.	Short in ABS main relay 2 circuit ABS main relay 2 internal stuck Skid control ECU assembly	Comes on	INF Code 6: SAE Code C130D Electronically controlled brake system DTC