Camshaft Position Sensors

The camshaft sensor contains a pick-up coil. A signal plate (rotor) is mounted on the camshaft. As the camshaft rotates, a protrusion on the signal plate passes near the pick-up coil. This induces AC voltage in the pick-up coil. The ECM senses AC voltage, and interprets it as camshaft position.

The ECM may use input signals for determining ignition timing (spark advance) and for controlling fuel injection system, idle speed control system, EGR system (ES300), heated oxygen sensor system and intake air control valve system.