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Checking the fuel injection system
The fuel injection system alone can only check the main electrical circuit and the condition of the fuel pump (below). If normal operation of the engine is broken, first check the condition of wiring and connectors. Check the condition of the air filter element, and the state and the electrode gap of the spark plugs. Check the crankcase ventilation hose and adjust the accelerator cable. If the engine then continues to be unstable, check the engine compression. Check the operation of the fuel injectors, if necessary, clean them. If the engine still works unstably, check the ignition system components. If the problem persists, check the fuses and the condition of the electrical connectors and wiring. On the electrical connectors should not be melted contact moisture, dirt, corrosion or other damage. After the self-check address on specialized station for diagnostics of fuel injection system with special equipment.
| Fig. 4.1. Location of ignition systems and fuel injection in the engine compartment of cars with four-cylinder engines: 1 - lambda probe G39 with heater Z19; 2 - the coolant temperature sensor G62; 3 - Electrical connections: lambda probe and lambda probe heater - gray, engine speed sensor - green, knock sensor - blue, knock sensor 2; 4 - the engine control unit J220 and the height sensor F96; 5 - solenoid valve 1st absorber N80; 6 - Switch N122; 7 - the air flow meter G70; 8 - solenoid valve increase pressure N75; 9 - the ignition coil; 10 - the fuel injectors N30, N31, N32, N33; 11 - Hall sensor G40; 12 - knock sensor 1 G61; 13 - the gauge of a detonation 2 G66; 14 - the engine speed sensor G28; 15 - the gauge of temperature of air entering the engine G42; 16 - a control unit J338 Throttle
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Location of ignition systems and fuel injection four-cylinder engine is shown in Fig. 4.1, the six-cylinder - to Fig. 4.2.
| Fig. 4.2. Location of ignition systems and fuel injection in the engine compartment of vehicles with six-cylinder engines: 1 - 4-pin connector for lambda probe 1 G39; 2 - 3-pin knock sensor 1 G61; 3 - coolant temperature sensor G62; 4 - throttle control unit J338; 5 - the gauge of temperature of air entering the engine G42; 6 - overpressure valve in the intake manifold N156; 7 - 4-pin connector for lambda probe 2 G108; 8 - 3-pin connector of the engine speed sensor G28; 9 - 3-pin knock sensor 2 G66; 10 - the engine control unit J220; 11 - the fuel pressure regulator; 12 - Hall sensor G40; 13 - Lambda probe 2 G108; 14 - the engine speed sensor G28; 15 - the gauge of a detonation 2 G66; 16 - the valve changes the camshaft N208; 17 - ignition coils with the switch N122; 18 - knock sensor 1 G61; 19 - the fuel injectors N30, N31, N32, N33, N83, N84; 20 - Hall sensor G163; 21 - Lambda probe 1 G39; 22 - wire connection with "weight"; 23 - the valve changes the camshaft 1 N205; 24 - air flow meter G70; 25 - solenoid valve 1st absorber N80
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