ABS light on and off?

When the ABS (Anti-lock Braking System) light is turning on and off in your 1991 Daihatsu Applause, it indicates a potential issue with the ABS system. The ABS system is responsible for preventing the wheels from locking up during heavy braking, thus maintaining steering control and stability.

There are several possible reasons for the intermittent ABS light:

Wheel Speed Sensors: The ABS system uses wheel speed sensors to monitor the rotational speed of each wheel. If any of these sensors are dirty, damaged, or malfunctioning, the ABS light may illuminate.

ABS Control Module: The ABS control module is the brain of the ABS system, and if it detects a fault in the system or its components, it will trigger the ABS light.

Wiring or Connector Problems: Loose, damaged, or corroded wiring and connectors related to the ABS system can cause intermittent ABS light activation.

Faulty ABS Pump/Motor: The ABS pump or motor may be failing or experiencing intermittent issues, leading to the ABS light coming on.

Brake Fluid Level: In some vehicles, a low brake fluid level can trigger the ABS light.

To diagnose the exact cause of the intermittent ABS light, you'll need to perform a diagnostic scan using a compatible OBD-II scanner. The scanner will retrieve specific trouble codes from the ABS system, providing information about the detected issue. Once you have the trouble codes, you can further investigate the problem and take appropriate corrective action.

If you're comfortable with automotive diagnostics and repairs, you can try checking the wheel speed sensors, inspecting the wiring and connectors, and ensuring the brake fluid level is correct. However, for more complex issues with the ABS system, or if you're unsure about handling the diagnostics, it's recommended to take your Daihatsu Applause to a qualified mechanic or an authorized service center with experience in ABS systems. They have the necessary tools and expertise to accurately diagnose and fix the ABS issue to ensure proper braking performance and safety.