Self-Diagnosis Function
- The ABS control unit is equipped with a main CPU and a sub-CPU. Each CPU checks the other for problems.
- The CPUs check the circuit of the system.
- The ABS control unit turns on the ABS indicator when the unit detects a problem and the unit stops the system.
- The self-diagnosis can be classified into these two categories:
- Initial diagnosis. Done right after engine starts and until ABS indicator goes off
- Regular diagnosis. Done right after initial diagnosis until the ignition switch is turned off.
- When a problem is detected by the self-diagnosis, the system:
- Turns the fail safe relay off.
- Turns the solenoid valve off.
- Turns pump motor off.
- Turns ABS indicator on.