Ford Sierra Cosworth 2wd
Originally with Weber-Marelli engine management.
System component:
The distributor
The dristibutor is driven by the auxiliary shaft as on the standar ohc engine.
A phase sensor , locatoed opposite a cam having two teeth separated at 90° to each other, is fitted inside the distributor. At the passing of a tooth the sensor delivers a signal to the ECU. This signal is similar to the signal supplied by an RPM/TDC sensor fitted at the crankshaft pulley.
Both te signal from the distributor and the RPM/TDC sensor enable module to idetify the phase of each cylinder.
Ignition module
The ECU sends a Spark-out signal to the ignition module to trigger an H.T. pulse by switching the coil primary circuit off.