Engine speed sensor (see section 4B or 4C) is attached to the flywheel housing and provides the processor unit with signals of the rotation speed and angular position of the crankshaft. Intake manifold pressure sensor (see section 4B or 4C) provides the processor unit with a signal dependent on the vacuum in the intake manifold, which indicates the engine load. Based on these signals, the processor calculates the ignition timing.
All engines except the 1171 cc E-series also have a knock sensor. Based on this signal, the processor adjusts the advance angle. In this way, the system can self-adjust to minor changes in the octane number of the fuel.
On D-series engines, a static ignition system is used. In such a system there is no distributor, and the module simply consists of two high-voltage ignition coils and an electronic control module, located in one block. Each ignition coil serves two cylinders (one supplies spark plugs for cylinders 1 and 4, and the other supplies spark plugs for cylinders 2 and 3). The ignition coils operate on the "wasted spark" principle, meaning the spark in the spark plugs fires twice during each engine cycle: on the compression stroke and on the exhaust stroke. The electronic control module uses signals from various sensors to calculate the required ignition timing and ignition coil charging time.
On E- and F-series engines, high voltage current passes from the ignition coil to the distributor rotor, and then to the corresponding spark plug. The distributor has no other functions except distributing high voltage current, the advance is adjusted by the processor unit. It is not possible to adjust the ignition timing except through the processor unit or sensors. The ignition module consists of an electronic amplifier and an ignition coil, assembled in one housing.
The processor unit also controls the fuel injection system and is described in detail in Section 4B or 4C; the same applies to the intake manifold air pressure sensor and the engine speed sensor.
To prevent damage to ignition system components and reduce the risk of injury, the following precautions should be observed.
Before disconnecting the system wiring, turn off the ignition.
Before connecting or disconnecting any diagnostic equipment (for example, a strobe) check that the ignition is off.
You can find the original at this link RenaultBook.ru
- Do not connect a capacitor or 12V bulb to the negative terminal of the ignition coil.
- Do not connect testers or strobe lights. requiring 12 volt power supply to the positive terminal of the ignition coil.
- Do not short-circuit high voltage wires to the electronic ignition processor unit housing.
- Do not short the primary or secondary windings of the ignition coil to ground.
Warning: The voltages produced by a contactless ignition system are significantly higher than those produced by a conventional ignition system. Use extreme caution when working on the system with the ignition on. People with an implanted cardiac pacemaker should not touch ignition circuits, components or diagnostic equipment.