Ignition System: Description and Operation

System Schematic Diagram:

PURPOSE

To provide the proper amount of spark at proper timing under all operating conditions.


CONSTRUCTION

The Electronic Ignition System consists of a Single Board Engine Controller (SBEC), distributor, Crankshaft Position Sensor (CPS), distributor, and ignition coil.


OPERATION

Proper spark advance is fully automatic, and is provided by a load table built into the SBEC. The SBEC also monitors signals from the Coolant Temperature Sensor (CTS), engine rpm, Manifold Air Temperature (MAT) Sensor, Throttle Position Sensor (TPS), and Manifold Absolute Pressure (MAP) Sensor when determining the correct ignition advance.

The SBEC receives information from the oxygen sensor and electronically adjusts the air-fuel mixture to assure the most efficient fuel burn possible.

The SBEC also controls the Auto Shut-Down (ASD) Relay, which provides power to the ignition coil, fuel pump, oxygen sensor heater element, and fuel injectors.


NOTE: Only the output devices and secondary ignition components are coversed in this section. for more information on computer system and sensors see, COMPUTERS AND CONTROL SYSTEMS