Ignition Control Module: Description and Operation

Ignition Coil And Power Transistor:

2.6L

PURPOSE
Triggers the ignition coil to create secondary spark.

LOCATION
Under the intake manifold, at rear.

OPERATION
A signal is sent to the power transistor whenever the engine is running. The signals are an on/off pulse, telling the ignitor when to fire the ignition coil.

With the ignition switch in ON or START, battery voltage is applied to the ignition coil and the engine control module (ECM) relay energizes. This applies battery voltage to the crank angle sensor. The crank angle sensor detects engine speed and the position of the piston in each cylinder.

This information is sent to the engine control module (ECM) which then sends a signal to the power switch. The power switch regulates the current flow in the primary winding of the ignition coil. When current flow through the primary winding is stopped, a high-voltage current is induced in the secondary winding of the ignition coil. The high-voltage current then flows through the distributor cap and rotor to the proper spark plug.

The radio noise suppressor helps reduce electrical interference.