System Description

The ignition system used for this vehicle has an electronic ignition control system and consists of the following parts.
- ECM: It detects the engine condition through the signals from the sensors, determines the most suitable ignition timing and time for electricity to flow to the primary coil and sends a signal to the power unit.
- Power unit (Igniter): It turns ON and OFF the primary current of the ignition coil according to the signal from ECM.
- Ignition coil: When the ignition coil primary current is turned OFF, a high voltage is induced in the secondary winding.
- Distributor: It distributes a high voltage current to each plug.
- High-tension cords and spark plugs.
- CMP sensor (Camshaft position Sensor): Located in the distributor, it converts the crank angle into voltage variation and sends it to ECM. For its details, refer to Computers and Controls / Camshaft Position Sensor.
- TP sensor, ECT sensor and MAP sensor For their details, refer to Computers and Controls / Engine Coolant Temperature Sensor.
In electronic ignition control system, the ECM is programmed for the best ignition timing under every engine condition. Receiving signals which indicate the engine condition from the sensors, e.g., engine revolution, intake air pressure, coolant temperature, etc., it selects the most suitable ignition timing from its memory and operates the power unit. Thus ignition timing is controlled to yield the best engine performance.