DTC C1391-00: Abnormal Leak in Accumulator [11/2020 - ]: Description
This DTC is stored if internal or external brake fluid leaks are detected due to improper sealing in the brake booster with master cylinder assembly or brake booster pump assembly. Internal leaks are suspected if the pump motor operates frequently without braking.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from | Priority | Note |
|---|---|---|---|---|---|---|
| C1391-00 | Abnormal Leak in Accumulator | Either of the following is detected:
|
|
Brake Booster | A | Output ECU: No. 1 skid control ECU (brake booster with master cylinder assembly) |
C1391-00 DTC DETECTION CONDITIONS
| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | When the brake pedal is not depressed and the pump motor is operating | ◦ | - |
| When the brake pedal is not depressed and the pump motor is not operating | - | ◦ | |
| Malfunction Status | The accumulator pressure sensor value does not increase a certain number of times | ◦ | - |
| The accumulator pressure sensor decrease rate exceeds a certain threshold a certain number of times. | - | ◦ | |
| Detection Time | - | - | |
| Number of Trips | 1 trip | 1 trip | |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.