Ignition Control Module: Description and Operation

Component Overview:

The Ignition Timing Control System operates by the ECU controlling the ignition timing through the 2 power transistors. The ECU uses all of the engine condition and vehicle operating condition sensors (during normal driving conditions) to compute the correct spark advance or retard. The ECU uses the power transistors to control the ignition spark.

The power transistors function to control the ignition timing by interrupting the ignition coils primary current ground causing secondary circuit discharge. The power transistors are solid state components.