Magnetic pickups are used in which automotive systems?

• A. Ignition only
• B. Ignition and ABS
• C. Power steering
• D. Climate control

Answer: (B)

Magnetic pickups provide timing signals from rotating parts by generating a voltage as a magnet and a gear or tone wheel pass by, creating pulses that the system can use to time events. In ignition systems, that signal tells the ignition module when to fire the spark plugs, aligning spark timing with the engine’s rotation. In ABS, wheel speed sensors use the same magnetic principle to create pulses for every tooth on the tone ring, letting the system calculate wheel speed and control braking. Because both ignition timing and ABS rely on this magnetic sensing, those two systems use magnetic pickups. Climate control and power steering don’t depend on this type of rotational sensing, so they don’t use magnetic pickups in the same way.