Escort L4-116 1.9L SOHC (1991)
Ignition Control Module: Description and Operation
Electronic Distributorless Ignition System (EDIS) Module
The Electronic Distributorless Ignition System (EDIS) module receives the signal from the crankshaft sensor and the Spark Advance Width (SAW)
signal from the Electronic Control Assembly (ECA). During normal operation the Profile Ignition Pick-up (PIP) signal is sent to the ECA from the EDIS
module and provides base timing and rpm information. The crankshaft sensor signal provides the EDIS module with the information required to
synchronize the ignition coils so that they are fired in the proper sequence. The SAW signal is a pulse width modulated signal and contains the optimum
spark timing information. The spark angle is determined by the EDIS using a zero excess dwell control routine.
The ignition module also synthesizes an Ignition Diagnostic Monitor (IDM) signal for use by the Electronic Engine Control (EEC-IV) strategy. The
EDIS module sends information on system failures to the ECA which stores information for diagnostic self tests.
