The ignition system uses a block consisting of two separate two-terminal ignition coils. The current in the primary windings of the ignition coils is controlled by a controller that receives information from sensors and uses two powerful transistor valves.
There are no moving parts in the ignition system, so it requires no maintenance or adjustments.
The ignition system uses a spark distribution method called the idle spark method. The engine cylinders are combined in pairs 1-4 and 2-3, sparking occurs simultaneously in two cylinders: in the cylinder in which the compression stroke ends (working spark), and in the cylinder in which the exhaust stroke occurs (idle spark).
Due to the constant direction of the current in the windings of the ignition coils, the sparking current in one candle always flows from the central electrode to the side electrode, and in the second - from the side to the central one,
The ignition system is controlled by the controller. The crankshaft position sensor supplies the controller «reference» a signal on the basis of which the controller calculates the firing sequence of the coils in the ignition module. To precisely control the ignition, the controller uses the following information:
- crankshaft speed;
- engine load;
- coolant temperature;
- crankshaft position;
- camshaft position;
- presence of detonation.
To check the ignition coils, do the following.
1. Disconnect the wire from the terminal «minus» battery.
2. Remove the decorative engine cover (see «Removal and installation of a decorative casing of the engine»).
3. Disconnect the high-voltage wire lugs and wiring harness pads from the ignition coils (see «Removal and installation of ignition coils»).
4. Measure the resistance of the secondary windings of the ignition coils by connecting the tester leads to the first and fourth, and then to the second and third high-voltage leads. The resistance of the secondary windings at a temperature of 21-27°C should be about 11.5-13.5 kOhm.
Note: For clarity, the test is shown on coils removed from the vehicle.
5. If the resistance of the secondary winding is very different from the specified, replace the ignition coil unit.
6. Measure the resistance of the primary windings of the ignition coil by connecting the tester leads to the leads of the primary windings of the coils. The resistance of the primary windings at a temperature of 21-27°C should be about 1-2 ohms.
7. If the resistance of the primary winding is very different from the specified, replace the block of ignition coils.