General Information

1.0 Liter:

The Powertrain Control Module (PCM) controls the ignition timing in ignition system. The PCM receives information on engine status from the engine sensors. The PCM then selects the most appropriate ignition timing settings from within the PCM's programming. No vacuum or mechanical advance mechanisms are used. The ignition system includes a noise suppressor filter to eliminate ignition sound. The noise suppressor filter also provides the tachometer (if equipped) with an ignition signal. Periodic lubrication of the distributor is not required.

The PCM sends a signal to the ignition control module. The ignition control module is connected to the negative side of the ignition coil's primary circuit. When the signal from the PCM is interrupted, the field around the primary coil collapses and a high voltage is induced in the secondary coil. The high voltage induced in the secondary coil is then forced to find a ground through the secondary (coil) wire, the rotor, the distributor cap, the secondary (spark plug) wires and across the spark plug gap to the engine block. The following are the most important inputs for determining ignition timing requirements:
^ The throttle position
^ The manifold pressure
^ The engine coolant temperature
^ Engine speed