Fail-Safe Function
When an abnormality occurs (an abnormal DTC is detected), ABS control module turns OFF the fail-safe relay (transistor) which supplies power to it self. Thus, with ABS not operating, brakes function just like the brake system of the vehicle without ABS.
FAIL-SAFE OPERATION
| Trouble Area | EBD Operation | ABS Operation | |
|---|---|---|---|
| Normal | Controllable | Controllable | |
| G sensor circuit | Controllable | Uncontrollable | |
| Wheel speed sensor circuit or sensor ring | Controllable in malfunction of one wheel. Uncontrollable in malfunction of 2, 3 or all wheels. | Uncontrollable | |
| Inlet solenoid valve circuit or outlet solenoid valve circuit | Uncontrollable | Uncontrollable | |
| Power source | High voltage | Uncontrollable | Uncontrollable |
| Low voltage | Controllable | Uncontrollable | |
| ABS pump motor and/or motor relay circuit | Controllable | Uncontrollable | |
| Fail-safe relay | Uncontrollable | Uncontrollable | |
| ABS control module | Uncontrollable | Uncontrollable | |