Engine Speed Sensor
WARNING: This page is about a different car, the 1992 Mercedes-Benz 400E. However, it is still accessible from the selected car via links, so may be relevant.
Engine speed is delivered to EZL/AKR ignition control unit by crankshaft position sensor in the form of an AC voltage signal. The EZL/AKR ignition control unit processes the AC voltage signal converting it to a square wave signal. The EZL/AKR ignition control unit sends the square wave signal to the LH control unit through Controller Area Network (CAN).