Ignition Control Module: Description and Operation

Ignition Coils And Module:

Typical Ignition Module Assembly:

The DIS module monitors the crank sensor signals. Based on these signals, it sends a reference signal to the PCM so that correct spark and fuel injector control can be maintained during all driving conditions. During cranking, the DIS 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 PCM controls the spark timing through the module (EST), and compensates for all driving conditions. The DIS module must receive a "sync pulse" and then a crank signal in that order to enable the engine to start. The DIS module is not repairable. When a module is replaced, the remaining DIS module components must be transferred to the new module.