Engine Control Module: Description and Operation

1986-87
The [1][2]power module is mounted on the air cleaner along with the spark control computer and contains circuits necessary to energize the ignition coil, fuel injectors and alternator field in order to minimize electrical noise in the passenger compartment. The module contains a power converter which converts battery voltage into a regulated 8 volt output to energize the logic module and ignition pickup coil. The power module also houses and energizes the Automatic Shut Down (ASD) relay which activates the fuel pump, ignition coil injector and portions of the power module.
The ASD relay is turned on and off by the logic module in response to distributor reference pulses. When distributor reference pulses are transmitted to the logic module, the module activates the ASD relay. However, when no reference pulse is transmitted to the logic module the ASD relay is deactivated and power is shut off to the fuel control system and ignition coil.