DTC C1400-00: Brake Pressure Leak Malfunction; DTC C140A-00: Pressure Control Reservoir Leak Malfunction [11/2020 - ]: Description

The No. 2 skid control ECU (brake actuator assembly) controls the brake fluid pressure of each wheel cylinder based on the brake fluid pressure sensor.

DTCs may be stored if one of the following occurs:

Brake fluid leaks.
Foreign matter enters a solenoid valve.
Brake pads are replaced.
Rotors are replaced.
HINT:

When replacing the brake pads, retracting the brake caliper pistons and installing new brake pads will greatly increase the clearance between the brake pads and brake discs. This will result in a significant possibility of this DTC being stored the next time the brake pedal is depressed. As this is not a malfunction, clear the DTC if it is stored for this reason.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from	Priority	Note
C1400-00	Brake Pressure Leak Malfunction	When all of the following conditions are met, a malfunction such as a leak in an ABS decrease pressure valve of the brake actuator assembly is detected: The vehicle was driven before the ignition switch was turned off. 90 seconds have elapsed since the ignition switch was turned off. The vehicle is stopped and the shift position is P.	Brake booster with master cylinder assembly Brake actuator assembly	Brake/EPB	A	Output ECU: No. 2 skid control ECU (brake actuator assembly)
C140A-00	Pressure Control Reservoir Leak Malfunction	When all of the following conditions are met, a malfunction is detected by the No. 2 skid control ECU (brake actuator assembly) during self-diagnosis. The vehicle was driven before the ignition switch was turned off. 90 seconds have elapsed since the ignition switch was turned off. The vehicle is stopped and the shift position is P.	Brake booster with master cylinder assembly Brake actuator assembly	Brake/EPB	A	Output ECU: No. 2 skid control ECU (brake actuator assembly)