System Description

The ignition system used for this vehicle uses a direct ignition system so as to avoid jamming caused by the secondary voltage which occurred in the ignition coil and ensure stable ignition even during a high engine speed. Also, IC (Ignition Control) system is adopted to obtain the ignition timing suitable for the every engine conditions.
The components of this system are as follows.
- 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 igniter (power unit).
- Igniter (Power unit)
It turns ON and OFF the primary current of the ignition coil according to the signal from ECM.
- Ignition coils
When the ignition coil primary current is turned OFF, a high voltage is induced in the secondary winding. One ignition coil is in charge of ignition of one cylinder only.
- CMP sensor (Camshaft Position Sensor)
Being photoelectrically operated, this system converts timing and time by and during which the light is received at the light receiving part in the CMP sensor into the electric signals. It also outputs the engine speed (position) signal and the cylinder identification (reference) signal to ECM.
- Spark plugs
- TP sensor, ECT sensor and MAF sensor
For their details, refer to the applicable component.
The direct ignition system does not have a distributor or high tension cords but each cylinder has an ignition coil and the secondary voltage which occurred in the ignition coil is sent to the spark plug directly. Also, the engine speed (position) signal and cylinder identification (reference) signal are sent from the CMP sensor to ECM so as to control each ignition coil independently through the igniter. In IC (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 volume, coolant temperature, etc., it selects the most suitable ignition timing from its memory and operates the igniter (power unit). Thus ignition timing is controlled to yield the best engine performance.





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