What causes the ABS warning light to illuminate in the Emgrand EC7?

[LaRafael]

There are multiple states in which the ABS light may illuminate, with different causes and solutions for each state. Details are as follows: State 1: ABS warning light remains constantly lit (most common). Cause 1: The ABS wheel speed sensor's sensing area is covered by dirt, mud, or other contaminants, affecting its ability to detect the corresponding speed signal. This prevents the ABS control unit from determining the vehicle speed or calculating wheel slip rates, thus failing to issue appropriate commands for brake adjustment. Solution: Clean contaminants from the wheel speed sensor and adjust the gap between the sensor and the tone ring to restore normal function. Cause 2: Poor signal transmission due to loose system wiring connections or faulty ABS relay contacts. Solution: Inspect wiring connections and re-secure any loose connections. State 2: ABS warning light intermittently illuminates but turns off during acceleration. Cause: When multiple electrical components are in use, battery voltage drops below 10.5V. The light extinguishes as engine speed increases and voltage rises. Possible low system supply voltage due to poor terminal contact or grounding issues. Solution: Check battery specific gravity; inspect charging system; examine power supply components (e.g., voltage relay or poor power contacts). State 3: ABS warning light stays illuminated after engine start until engine IGFF position. Cause: Poor grounding connection of ABS hydraulic valve body; faulty wiring harness connector at hydraulic valve body; ABS control module malfunction. Solution: Loosen and re-tighten hydraulic valve body ground screw, cleaning contact surfaces if necessary; inspect connectors for excessive play; replace ABS or ABS/ASR control module. State 4: ABS warning light illuminates during high-speed driving. Cause: ABS control module detects excessive speed difference between rear and front wheels; incorrect tire or wheel rim specifications. Solution: Verify proper tire and wheel rim specifications as indicated on vehicle's fuel filler door label. State 5: ABS warning light intermittently flashes. Cause: Improper brake light switch adjustment; internal contact failure in brake lights. Solution: With engine running, depress brake pedal and manually push brake switch lever downward to reset position; replace brake light switch if needed. When the ABS warning light is illuminated, continued driving is not recommended. An active ABS light indicates a malfunction in the anti-lock braking system. During emergency braking, wheel lock-up may occur, causing loss of vehicle control and skidding, which prevents the driver from decelerating or adjusting the vehicle's trajectory, posing significant safety risks.