To determine the ignition timing, the control unit uses information stored in memory and information from sensors installed on the engine. The ignition system receives control signals from a Hall sensor or an impulse sensor. Additionally, the control unit corrects the ignition timing and, according to the signal from the knock sensor, which is sensitive to pre-ignition, accordingly reduces the ignition timing.
Warnings: In order not to damage semiconductor devices (diodes and transistors) When working on the ignition system, the following requirements must be met:
- while the engine is running, do not disconnect the battery, alternator or any electrical connectors;
- when carrying out any work, remove the negative terminal from the battery;
- during electric welding work on the car, turn off the generator and the control unit;
- do not allow the engine to run with the generator disconnected from the electrical system.
Do not touch high-voltage wires with your hand or disconnect them while the engine is running or while the engine is cranking with the starter.
Disconnect wires of system of ignition and wires of measuring devices only at the switched off ignition.
Pic. 4.1–22. Air filter: 1 - air duct; 2 - air flow meter G70; 3 - collar; 4 - inlet air duct; 5 - collar; 6 - suction air duct; 7 - nut; 8 - rubber cushion; 9 - filter element of the air filter; 10 - air filter housing; 11, 12 - air duct
Pic. 4.1–23. Fuel line with injectors: 1 - fuel supply pipe from the fuel filter; 2 – a tube of return of fuel; 3 - bolt, 10 Nm; 4 - spring connector; 5 - sealing rings; 6 - fuel pressure regulator; 7 - fuel line; 8 – spring connector; 9 - sealing ring; 10 - nozzle; 11 - sealing ring; 12 - intake manifold
Pic. 4.1–24. Throttle assembly and intake manifold switching system: 1 – the top part of an inlet collector; 2 - bolt, 10 Nm; 3 - bolt, 20 Nm; 4 - gasket; 5 - idle speed stabilization valve N71; 6 - bolt, 10 Nm; 7 - bolt, 6 Nm; 8 - flange; 9 - the base of the intake manifold; 10 - gasket; 11 - bolt, 10 Nm; 12 - vacuum chamber of the intake manifold switching valve; 13 - bolt, 20 Nm; 14 - throttle assembly; 15 - gasket; 16 - bolt, 20 Nm; 17 - mechanical valve of the exhaust gas recirculation system (EGR); 18 - temperature sensor EGR G98; 19 - bolt, 10 Nm; 20 - gasket; 21 - bolt, 10 Nm
Pic. 4.1–25. Elements of the ignition system: 1 - engine control unit J192; 2 - 4-pin brown electrical connector from the engine control unit; 3 - switch N122; 4 - 3-pin dark brown electrical connector from the primary windings of the ignition coils; 5 - 3-pin electrical connector from knock sensor G66; 6 - Hall sensor G40; 7 - sensor for setting the ignition timing G4 on the left cylinder block; 8 - knock sensor G66; 9 - ignition coils N, N128, N158; 10 - knock sensor G61; 11 - a tip with a spark plug; 12 - electrical connector for the G4 ignition timing sensor; 13 – an electric socket of the gauge of a detonation G61; 14 – an electric socket of coils of ignition; 15 - to connection S115 (located in the relay and fuse box); 16 - 16-pin electrical connector C brown; 17 - 20-pin electrical connector B red; 18 - 12-pin electrical connector A black; 19 - 16-pin electrical connector D green
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