Lumina V6-191 3.1L VIN T MFI (1993)
Ignition Control Module: Description and Operation
California Emissions (GEN-II S)
Typical Ignition Module Assembly
Ignition And Injector Wiring
PURPOSE
The Electronic Ignition (EI) module monitors the crank sensor signals and based on these signals sends a reference signal to the ECM so that
correct spark and fuel injector control can be maintained during all driving conditions.
OPERATION
During cranking, the EI module monitors the "sync pulse" to begin the ignition firing sequence, and below 400 rpm the module controls spark
advance by triggering each of the three coils at a pre-determined interval based on engine speed only. Above 400 rpm, the ECM controls the spark
timing through the module, and compensates for all driving conditions. The EI module must receive a "sync pulse" and then a crank signal in that
order to enable the engine to start.
DIAGNOSTIC NOTES:
The EI module is not repairable. When a module is replaced, the remaining EI module components must be transferred to the new module.
