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 warning light / yellow (minor malfunction) and sounds the skid control buzzer if it senses a decrease in the accumulator pressure.
DTC C1256/57 may be output if the accumulator pressure drops due to frequent braking (this is not a malfunction).
| DTC Code |
INF Code |
DTC Detection Condition |
Trouble Area |
| C1256/57 |
141 |
Either of the following is detected:
- When detecting the vehicle speed, the brake operation signal is input with the accumulator pressure low or the accumulator pressure extremely decreased while braking for 0.3 seconds or more.
- The accumulator pressure has been low since system start and pressure is less than 14.62 MPa for 120 seconds (stores the DTC after the conditions are met, and sounds buzzer).
|
- Accumulator pressure
- Brake actuator assembly (Accumulator pressure sensor)
- Brake booster pump
|
| ↑ |
143 |
Any of the following is detected:
- When detecting the vehicle speed, any of the wheel cylinder pressure sensor values is lower than the specified value with the accumulator pressure low for 0.5 seconds or more.
- The accumulator pressure decreases without increasing the wheel cylinder pressure of each wheel.
- With the motor relay abnormal or off, the accumulator pressure is less than 14.62 MPa for 0.5 seconds or more.
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