Crank Angle Sensor

On 2.0L turbo and non-turbo engines, crank angle sensor is located on rear side of cylinder head, coupled to intake camshaft. On 1.8L engine, crank angle sensor is located inside distributor. Crank angle sensor provides ECU with engine speed and crankshaft angle position. Crank angle sensor consists of a disc and sensor unit.

The disc made of metal, has 4 slits located 90 degrees apart and 2 slits (1 slit on 1.8L) located 180 degrees apart inward of the 4 slits. On 2.0L, the inner slits are used by the top dead center sensor to detect top dead center of No. 1 and No. 4 cylinders. On 1.8L, the inner slit is used by the top dead center sensor to detect top dead center of No. 1 cylinder. On all engines, the outer 4 slits are used by the crank angle sensor to detect crank angle. On 2.0L, the disc is positioned on the crank angle sensor shaft and is turned with sensor shaft by intake camshaft. On 1.8L, the disc is fixed to distributor shaft and rotates as distributor turns. On all engines, crank angle sensor unit has 2 LEDs and 2 photo diodes, used to detect crank angle sensor slits and top dead center sensor slits. The disc rotates between the LEDs and photo diodes. Each time a slit comes between LED and photo diode pair, light emitted by LED reaches photo diode by passing through the slit.