What Causes Both ABS and Malfunction Indicator Lights to Illuminate?

[StRachel]

Here are the specific reasons why a vehicle's ABS warning light may illuminate: 1. ABS pump failure or issues with the ABS pump's power supply/grounding circuit. 2. Loose sensor connectors or failure of a specific sensor. 3. Related fuse blown or burnt out. 4. Obstruction in system signal transmission. 5. False alarm due to system misreporting. Below is extended information about the ABS system: 1. Function of ABS system: ABS (Anti-lock Braking System) is a vehicle active safety system that prevents wheel lock-up. When the ABS light illuminates, it indicates the vehicle's computer has detected a fault in the ABS system. 2. Principle of ABS light activation: Under normal driving conditions, the ABS remains dormant. It only activates during emergency braking situations, such as high-speed hard stops, when the vehicle computer determines intervention is necessary. The ABS light typically illuminates when wheel speed sensors malfunction, preventing the ABS computer from monitoring individual wheel rotation and comparing slip ratios, thereby rendering the ABS system inoperable.