C1311 Code: Meaning, Causes, and Symptoms | OBD2 Codes
C1311 – Open In Main Relay 1 Circuit
C1311 Possible Symptoms
Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)
C1311 Possible Causes
Faulty Anti-Lock Brake System (ABS) Main Relay 1,ABS Main Relay 1 harness is open or shorted,ABS Main Relay 1 circuit poor electrical connection
The Anti-Lock Brake System (ABS) main relay 1 (ABS No.1 relay) supplies power to the changeover solenoid and the linear solenoid. ABS main relay 2 (ABS No.2 relay) goes on for approximately 5 seconds after the ignition switch is turned off and the braking effort signal input is terminated. ABS main relay 2 (ABS No.2 relay) supplies electricity and maintains operating condition for the brake system when the ignition switch is off.