Ignition System: Description and Operation

IGNITION AND TIMING SYSTEMS
The ignition system provides spark control engine during all modes of engine operation. The system consists of 3 sub-systems; primary ignition, secondary ignition, and timing control.

The 1.3L, 1.8L, and 2.0L M/T engines use separate Ignition Control Module (ICM) and coil.

The 1.6L engines use an integrated distributor mounted system with vacuum advance.

The 2.0L 4EAT and 2.5L engines use a distributor with integrated coil and ignition control module.

PRIMARY IGNITION COMPONENTS
These components include coil primary circuit, ignition control module, and ignition switch. When ignition is switched "ON," it charges primary coil windings. When engine is running, ignition control module induces the spark by grounding coil primary circuit negative side.

SECONDARY IGNITION COMPONENTS
These components include spark plugs and wires, distributor cap, rotor, and coil secondary circuit. When ignition module grounds primary circuit, inductive charge built up in secondary circuit sends spark from coil to distributor. Rotor and cap then send spark to each plug.

ADVANCE COMPONENTS
Advance and retard functions for 1.3L, 1.8L, 2.0L, and 2.5L engines are Powertrain Control Module (PCM) controlled. PCM receives signals from various switches and sensors and sends spark timing signal to distributor.

The 1.6L turbo uses governor weights, a knock control module, and vacuum advance/boost retard diaphragm.

The 1.6L non-turbo uses governor weights and a dual vacuum advance diaphragm.