D21 Hardbody 4WD V6-2960cc 3.0L SOHC MFI (VG30E) (1991)
Crankshaft Position Sensor: Description and Operation
Camshaft Position / Crank Angle Sensor
The crank angle sensor monitors engine speed and piston position.
It has a rotor plate and a wave forming circuit. The rotor plate has 360 slits for 1° signals and 6 slits for 120° signals. Photo diodes and light
emitting diodes (LED's) are used for the wave forming circuit.
When the rotor passes between the photo diodes and LED's the slits in the rotor plate cut the light being transmitted to the photo diode from the
LED. This generates pulses which are changed into ON/OFF signals by the wave forming circuit. The ECU interprets these signals to calculate
engine rpm and cylinder position.