Flow of Diagnosis

Anti-lock brake system
The wheel ABS is composed of electrical and mechanical components (hydraulic unit), and components of the standard brake system. The system uses Sensors and Channels that control front wheels and rear wheels each independently. When the system detects a slip in one of the wheels, hydraulic pressure is applied to the brakes on the side where the slip is first detected.
Any malfunction of the ABS electrical or mechanical components is judged by the self-diagnosis function in the ABS control unit. All malfunctions are indicated by the warning lamp in the instrument panel. In normal condition, the ABS warning lamp is on for 2-3 seconds after engine starts and goes out. If it stays on continuously, you may have malfunction with ABS system. The location of a malfunction is indicated to the technician by a diagnosis scan tool (Hi-scan pro). The self-diagnosis and indication functions must be used when diagnosing malfunctions of the ABS.





How to use diagnosis and troubleshooting

Self-diagnosis
The ABS control unit starts self-diagnostic functions after the ignition is switched ON. The ABS control unit detects failure for each circuit and component by comparing condition of the system with limited condition set inside the ABS control unit, ABS control unit stores the failure code and then outputs the four-digits of malfunction code to the diagnostic scan tool (Hi-scan pro) when the ABS terminal of the diagnostic connector is connected.





The management of failure detected

Detect mode
A: Initial check
B: Outside the ABS control cycle
C: Inside the ABS control cycle
D: Diagnosis mode
E: Failure mode