DTC C12F8-12: ECB Solenoid Control "A" Circuit Short to Battery; DTC C12F8-14: ECB Solenoid Control "A" Circuit Short to Ground or Open [11/2020 - ]: Description
The main relay is built into the No. 1 skid control ECU (brake booster with master cylinder assembly).
The main relay supplies power to the switching solenoid and the linear solenoid.
The main relay remains on for approximately 3 minutes after the ignition switch is turned off and the input of brake pedal operation signals stops, and supplies power to the system to keep it ready to operate.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from | Priority | Note |
|---|---|---|---|---|---|---|
| C12F8-12 | ECB Solenoid Control "A" Circuit Short to Battery | When there is a main relay off command from the ECU, 3.5 V or more is detected at terminal BS for 4.5 seconds or more. |
|
Brake Booster | A |
|
| C12F8-14 | ECB Solenoid Control "A" Circuit Short to Ground or Open | Either of the following is detected:
|
|
Brake Booster | A |
|
| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | When the ignition switch is turned to ON (READY) | ◦ | - |
| When the IG1 terminal voltage is 9.5 V or more | ◦ | - | |
| When the ignition switch is off | - | ◦ | |
| Malfunction Status | The BS terminal voltage is less than 3.3 V and operation of the main relay is requested | ◦ | ◦ |
| Detection Time | 0.05 seconds or more. | 0.05 seconds or more. | |
| 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.