V8 Quattro V8-3562cc 3.6L DOHC (PT) (1990)
Crankshaft Position Sensor: Description and Operation
DESCRIPTION
Crankshaft Position (Reference) And Engine Speed Sensors
The Crankshaft Position (CKP) Sensor (or reference sensor) is a magnetic induction type sensor located on the rear of the engine block.
Crankshaft Position Sensor And Engine Speed Sensor
The sensor contains a permanent magnet, and an iron core surrounded by an induction coil. The magnet sets up a magnetic field around the iron core. As
the engine turns, a reference pin, located on the flywheel, passes in close proximity to the end of the iron core, disturbing the magnetic field. This change
in the magnetic field induces a small current in the coil surrounding the iron core, creating a wave-like pulse that the ECM can detect. This pulse
indicates the exact position of the crankshaft (72°BTDC # 1 cyl.) once each revolution.