General information
The ignition system of the gasoline engine is integrated with the fuel injection system and controlled by a single ECM (see chapter Power supply systems, release and reduction of toxicity of exhaust gases). The ignition system consists of an engine control module (ECM), ignition switch, ignition module (ICM) with built-in coils, spark plugs, high-voltage wires and a set of information sensors.
On C14NZ engines The ignition system consists of a CKP sensor, a distributor with a rotor, an ignition coil and spark plugs. All elements of the ignition system are adjusted and ensure that there is no shift in the ignition timing.
Other gasoline engines are equipped with a direct injection system (DIS). This system does not have an ignition distributor. The distribution of the ignition voltage to the individual cylinders is carried out by electronic components. The voltage required to generate a spark is generated by two ignition coils, which are mounted in the DIS ignition module located on the cylinder head. Synchronization of the ignition system is carried out by signals from the CKP sensor. The CKP sensor is located on the side of the cylinder block. It registers the number of revolutions of the crankshaft using a toothed rotor mounted on the crankshaft pulley.
To determine the ignition timing, the control unit uses the ignition characteristic stored in its electronic memory, which determines the optimal ignition timing in various operating conditions.
Precautionary measures
In the electronic ignition system, a very high voltage is generated! Be careful, observe all necessary precautions when servicing any system components, including not only the main (ignition module, coil and BB wires), but also related, such as candle connectors, a tachometer and other equipment. Persons with an implanted pacemaker must not be allowed to service the components of the ignition system!
To avoid damage to ignition system components and to reduce the risk of injury, observe the following precautions.
- If the engine does not start, do not keep the ignition on for more than 10 seconds;
- Before disconnecting the electrical wiring of any of the components of the system, turn off the ignition;
- Before connecting and disconnecting diagnostic equipment (e.g. stroboscope) turn off the ignition;
- Do not ground the ignition coil windings to ground.
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