DTC C1311: Open Circuit in Main Relay 1; DTC C1312: Short Circuit in Main Relay 1 [02/2019 - 12/2021]: Description
The ABS main relay supplies power to the changeover solenoid and the linear solenoid.
The ABS main relay remains on for approximately 2 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 | INF Code | DTC Detection Condition | Trouble Area | Note |
|---|---|---|---|---|---|
| C1311 | Open Circuit in Main Relay 1 | 1 | Either of the following is detected:
|
|
- |
| C1312 | Short Circuit in Main Relay 1 | 2 | The ABS main relay contact is turned ON (BS terminal voltage 3.5 V or more) for 4.5 seconds or more when the ABS main relay OFF is requested from the ECU. |
|
- |
DTC DETECTION CONDITIONS: C1311
| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | When the ignition switch is ON (READY) | ◦ | - |
| When the ignition switch is off | - | ◦ | |
| Malfunction Status | The ABS main relay contact is not turned ON (BS terminal voltage 3.5 V or more) for 0.2 seconds or more when the ABS main relay ON is requested while IG1 terminal voltage is 9.5 V higher than | ◦ | - |
| The ABS main relay contact is not turned ON (BS terminal voltage 3.5 V or more) for 0.2 seconds or more when the ABS main relay ON is requested | - | ◦ | |
| 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.