If a vehicle exhibits intermittent ABS activation without DTCs found, what could be a likely cause?

• A. Damaged tone wheel teeth
• B. Clogged master cylinder
• C. Worn brake pads
• D. Loose lug nuts

Answer: (A)

Intermittent ABS activation without any diagnostic trouble codes (DTCs) suggests a sporadic issue related to the ABS system. One likely cause in this scenario is damaged tone wheel teeth. The tone wheel, also known as a reluctor ring, is an essential component that works with the ABS sensors to monitor wheel speed. If the teeth of the tone wheel are damaged or misaligned, it can lead to erratic signals being sent to the ABS control module.

When the ABS control module receives inconsistent signals, it may incorrectly interpret that a wheel is locking up, leading to intermittent activation of the ABS system. This can happen without triggering a DTC because the issue may not be severe enough to warrant a fault code being set, yet it still affects the system's operation.

Other possible causes, such as a clogged master cylinder, worn brake pads, or loose lug nuts, do not directly relate to the functioning of the ABS system in the same way. A clogged master cylinder typically affects overall braking performance but is less likely to specifically cause intermittent ABS activation without setting a code. Worn brake pads might lead to braking issues but would not influence the operation of the ABS sensors directly. Loose lug nuts can cause wheel and suspension issues, but again,