Final answer:
When an exciter ring tooth and gap move past the sensor tip, AC voltage is generated. This voltage can be used to determine wheel rotational velocity or detect faults through fault codes.
Step-by-step explanation:
When an exciter ring tooth and gap move past the sensor tip, the generated result is AC voltage. The exciter ring, which is typically attached to a rotating part of a vehicle, has teeth and gaps as part of its structure. When these teeth and gaps pass the sensor tip, it induces an alternating current (AC) voltage in the sensor. This voltage can then be used for various purposes, such as determining the wheel rotational velocity or detecting faults in the system through fault codes.