Camshaft Sensors
Static Hall sensors are used so camshaft positions are recognized once ignition is on, even before the engine is started. The function of the intake camshaft sensor is cylinder bank detection for preliminary injection, synchronization, engine speed sensor (if crankshaft speed sensor fails), and position control of the intake cam (VANOS). The exhaust camshaft sensor is used for position control of the exhaust camshaft (VANOS). If these sensors fail there are no substitute values. System will operate in the failsafe mode with no VANOS adjustment. The engine will still operate, but torque reduction will be noticeable. See Fig 1.