Ignition System: Description and Operation

System Components:

The Electronic Distributorless Ignition System (EDIS), consists of a Variable Reluctance Sensor (VRS), an EDIS Module, an EEC IV processor and one 6-tower Coil Pack. This system operates by sending crankshaft position information from the VRS to the EDIS module. The module generates a PIP signal and sends it to the EEC IV processor. The processor responds with a Spark Angle Word (SAW) signal containing advance or retard timing information back to the EDIS module. The module processes VRS and SAW signals and decides which coils to fire. In addition, the module generates an Electronic Diagnostic Monitor (EDM) signal to processor which is used to indicate a failure mode and also provide a tach output signal.