Ignition Control Module: Description and Operation

Operation of Power Transistor (DOHC)

When crankshaft position sensor signal is input to engine control module, engine control module makes ON-OFF control of ignition power transistors one by one.

When ignition power transistor A is turned from on to off, the spark plugs of No.1 and No.4 cylinders spark. Turning of ignition power transistor B from on to off will produce sparking in spark plugs of No.2 and No.5 cylinders. Furthermore, when igniton power transistor C is turned from on to off, sparking is produced in spark plugs of No.3 and No.6 cylinders.