What Causes the ABS System Abnormal Display on the Screen?

[VonIsabelle]

There are various conditions when the ABS warning light is on, with different causes and solutions for each condition. The details are as follows: Condition 1: ABS warning light stays on (most common). Cause 1: The ABS wheel speed sensor's sensing part is covered by dirt, mud, or other contaminants, affecting the sensor's ability to detect the corresponding speed signal. This prevents the ABS computer from determining the vehicle speed and the wheel slip rate, thus failing to issue appropriate commands to regulate braking. Solution: Clean the dirt from the wheel speed sensor and adjust the gap between the sensor and the signal ring to restore normal function. Cause 2: Poor signal due to loose connections in the system wiring or poor contact in the ABS relay, leading to system failure. Solution: Check the wiring connections and reconnect any loose parts. Condition 2: ABS warning light intermittently turns on but turns off when accelerating. Cause: When multiple vehicle electrical devices are in use, the battery voltage drops below 10.5V. As the engine speed increases, the voltage rises, and the ABS warning light turns off. The ABS system's power supply voltage is too low, possibly due to poor terminal contact or grounding issues. Solution: Check the battery's specific gravity; inspect the charging system; examine the power supply (e.g., voltage relay or poor power contact). Condition 3: ABS warning light stays on after engine start and only turns off when the engine is turned off (IGFF). Cause: Poor grounding contact in the ABS hydraulic valve body; loose wiring connections in the ABS hydraulic valve body; ABS computer malfunction. Solution: Loosen and then retighten the grounding screw on the hydraulic valve body, cleaning the contact surface if necessary; check if the connector gap has widened; replace the ABS or ABS/ASR computer. Condition 4: ABS warning light turns on during high-speed driving. Cause: During high-speed driving, the ABS computer detects a significant discrepancy between the rear and front wheel speed signals; incorrect tire or wheel rim specifications. Solution: Refer to the vehicle's tire and wheel rim specifications, as indicated on the label near the fuel tank cap. Condition 5: ABS warning light intermittently turns on. Cause: Improper adjustment of the brake light switch; poor internal contact in the brake light. Solution: Start the engine, press the brake pedal, and push the brake switch linkage down fully with a finger, then release the brake pedal to complete the self-setting position; replace the brake light switch if necessary. If the ABS warning light is on, it is advisable not to continue driving. An illuminated ABS light indicates a malfunction in the vehicle's anti-lock braking system. During emergency braking, if the wheels lock up, the vehicle may skid uncontrollably, preventing the driver from slowing down or adjusting the vehicle's trajectory, posing significant safety risks.

[ArabellaDella]

I previously encountered the ABS warning light coming on while driving. The most common cause is an issue with the wheel speed sensor, such as being blocked by dirt or snow, which leads to signal transmission failure and abnormal system display. Loose or corroded wiring connections can also interrupt the signal, especially when driving on bumpy roads. Although less common, a malfunction in the ABS module itself requires professional diagnosis. It's important to check if the brake fluid level is normal, as low fluid level or poor quality can trigger the warning. If the ABS function fails while driving, it means the tires are prone to locking up and skidding during emergency braking, increasing the risk. It's best to promptly clean the sensor area, and if the light remains on, visit a repair shop to use a scanner to read specific fault codes to prevent the problem from worsening.

[SanLuna]

Last time my car's dashboard showed an ABS malfunction, and it turned out the wheel speed sensor was dirty or damaged. These components are located near the wheels and are prone to contamination. Wiring aging or loose connections occur more frequently during humid seasons, and fuse blowouts due to circuit overload are also common. ABS pump issues are rare but more costly. An ABS warning light indicates the anti-lock braking system is disabled, so drive more cautiously and avoid sudden braking to prevent loss of control. From personal experience, quickly check fuses and sensor connections first, then have a technician scan for error codes to identify the root cause. Don't delay as it increases safety risks.

[Haven]

The ABS light typically illuminates due to wheel speed sensor issues, such as dirt or malfunctions blocking the signal. Short circuits, broken wires, or module errors could also be the cause. Insufficient brake fluid may sometimes trigger it. When driving with the ABS function disabled, avoid slamming on the brakes to prevent skidding. Address the issue promptly to avoid safety hazards. If simple self-checks prove ineffective, visit a repair shop.