Crankshaft Position (CP) Sensor

To provide the EEC system with an accurate timing reference (when pistons reach 10° BTDC), the crankshaft vibration damper is fitted with a 4-lobe "pulse ring".

As the crankshaft rotates, the pulse ring interrupts a magnetic field at the tip of the CP sensor (mounted on right front of engine). When the field is interrupted, an output signal is generated and sent to the ECA. The ECA uses these signals to determine the exact position of the crankshaft. From the frequency of the pulses, the ECA can determine engine RPM. By knowing these two factors, the ECA can determine the appropriate ignition timing advance required for best engine operation.