General information
The ignition system of the gasoline engine is integrated with the fuel injection system and is controlled by a single electronic control unit ECM (see Chapter Fuel, exhaust and emission control systems). The ignition system consists of the engine control module (ECM), ignition switch, ignition module (ICM) with integrated coils, spark plugs, high-tension 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 the ignition timing does not shift.
Other petrol engines are equipped with a direct injection system (DIS). This system does not have an ignition distributor. The distribution of ignition voltage to individual cylinders is performed by electronic elements. The voltage required to form a spark is created by two ignition coils, which are fixed in the DIS ignition module, located on the cylinder head. Synchronization of the ignition system is performed 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 under various operating conditions.
Precautionary measures
The electronic ignition system generates very high voltage! Be careful and take all necessary precautions when servicing any components of the system, including not only the main (ignition module, coil and high voltage wires), but also related items such as spark plug connectors, tachometer and other equipment. Persons with an implanted pacemaker should not be allowed to service ignition system components!
Source is on the website: OPELBOOK
To avoid damage to ignition system components and to reduce the risk of personal injury, observe the following precautions.
- If the engine does not start, do not keep the ignition on for more than 10 seconds;
- Before disconnecting any system component wiring, turn off the ignition;
- Before connecting and disconnecting diagnostic equipment (for example, a strobe) turn off the ignition;
- Do not allow the ignition coil windings to be grounded.
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