DTC C1256/57 Accumulator Low Pressure: Description
The accumulator pressure sensor is built into the actuator and detects the accumulator pressure, The skid control ECU turns on the brake control warning light and sounds the skid control buzzer if it senses a decrease in the accumulator pressure.
DESCRIPTION CHART
| DTC No. |
INF Code |
DTC Detection Condition |
Trouble Area |
| C1256/57 |
141 |
When either condition below is met:
- Braking operation is input when accumulator pressure is less than 12.45 MPa and vehicle speed is input (detected value changes if accumulator pressure is low after system start).
- Accumulator pressure is less than 14.62 MPa for 120 sec. (changes according to power source voltage) after system start (stores the DTC after the conditions are met, and drives buzzer).
|
Brake actuator assembly (accumulator pressure, accumulator pressure sensor, pump motor) |
| C1256/57 |
143 |
When one of following conditions is met:
- Any of the wheel cylinder pressure sensor value is lower than the target value for at least 0.5 sec. when accumulator pressure is less than 14.62 MPa and vehicle speed is input.
- Accumulator pressure changes little when accumulator pressure is less than 14.62 MPa for at least 1 sec. without braking (pump motor is operating).
- Accumulator pressure is less than 14.62 MPa for at least 0.5 sec. when motor relay is malfunctioning.
|
Brake actuator assembly (accumulator pressure, accumulator pressure sensor, pump motor) |