7.4. Check of system of injection of fuel

In system of injection of fuel it is independently possible to check only the main electric chains.
If normal operation of the engine is broken, first of all check a condition of electric conducting and sockets. Check a condition of the filtering element of the air filter, and also a state and an interelectrode gap of spark plugs. Check serviceability of hoses of ventilation of a case of the engine and adjustment of a cable of an accelerator. If the engine still continues to work unstably, check a compression in engine cylinders.
Check work of a fuel nozzle, if necessary clean it.
If the engine still works unstably, check elements of system of ignition.
If malfunction is not eliminated, check an integrity of fuses and a condition of electric sockets and an electrical wiring. On electric sockets there should not be melted-off contacts, moisture, dirt, traces of corrosion and other damages.
After conducting independent check address on the specialized station for diagnostics of system of injection of fuel on the special equipment.
The arrangement of elements of systems of ignition and injection of fuel of the six-cylinder engine is given in the figure 4.1-1, eight-cylinder – in fig. 4.1-2.


Fig. 4.1-1. An arrangement of elements of systems of ignition and injection of fuel in a motor compartment of cars with six-cylinder engines: 1 – N122 switchboard; And – the 3-contact socket of dark brown color, for primary chains of coils of ignition; B – the 4-contact socket of brown color from the control unit; 2 – control unit of the J192 engine; 3 – electric sockets: And – black color, 2 - contact from a heater a lambda sensor; B – 1-contact from a lambda sensor; C – brown color, from the switchboard; D – 2-contact blue color, from the detonation sensor; E – 3-contact white color, for power supply of coils of ignition; 4 – diagnostic socket; 5 – a potentiometer of a butterfly valve with the G69 switch; 6 – electric sockets: And – 2-contact black color, for a heater a lambda sensor; B – 1-contact, from a lambda sensor; C – 2-kontaktaktny blue color, from the detonation sensor; D – gray color, from the rotation frequency sensor; E – black color, from the sensor of installation of a corner of an advancing of ignition; 7 – sensor of temperature of G62 cooling liquid; 8 – Hall's sensor G40; 9 – sensor of frequency of rotation G28; 10 – sensor of installation of a corner of an advancing of ignition G4; 11 – G66 detonation sensor; 12 – ignition coils; 13 – nozzles; 14 – wire of connection with "weight"; 15 – G70 air consumption measuring instrument; 16 – electromagnetic valve of the 1st adsorber N80; 17 – G61 detonation sensor; 18 – fuel pressure regulator; 19 – G39 lambda sensor; 20 – relay of the fuel pump J17; 21 – valve of stabilization of frequency of rotation of idling N71; 22 – wire of connection with "weight"; 23 – valve of switching of an inlet collector N156; 24 – G108 lambda sensor


Fig. 4.1-1. An arrangement of elements of systems of ignition and injection of fuel in a motor compartment of cars with six-cylinder engines: 1 – N122 switchboard; And – the 3-contact socket of dark brown color, for primary chains of coils of ignition; B – the 4-contact socket of brown color from the control unit; 2 – control unit of the J192 engine; 3 – electric sockets: And – black color, 2 - contact from a heater a lambda sensor; B – 1-contact from a lambda sensor; C – brown color, from the switchboard; D – 2-contact blue color, from the detonation sensor; E – 3-contact white color, for power supply of coils of ignition; 4 – diagnostic socket; 5 – a potentiometer of a butterfly valve with the G69 switch; 6 – electric sockets: And – 2-contact black color, for a heater a lambda sensor; B – 1-contact, from a lambda sensor; C – 2-kontaktaktny blue color, from the detonation sensor; D – gray color, from the rotation frequency sensor; E – black color, from the sensor of installation of a corner of an advancing of ignition; 7 – sensor of temperature of G62 cooling liquid; 8 – Hall's sensor G40; 9 – sensor of frequency of rotation G28; 10 – sensor of installation of a corner of an advancing of ignition G4; 11 – G66 detonation sensor; 12 – ignition coils; 13 – nozzles; 14 – wire of connection with "weight"; 15 – G70 air consumption measuring instrument; 16 – electromagnetic valve of the 1st adsorber N80; 17 – G61 detonation sensor; 18 – fuel pressure regulator; 19 – G39 lambda sensor; 20 – relay of the fuel pump J17; 21 – valve of stabilization of frequency of rotation of idling N71; 22 – wire of connection with "weight"; 23 – valve of switching of an inlet collector N156; 24 – G108 lambda sensor


Fig. 4.1-2. Arrangement of elements of systems of ignition and injection of fuel in a motor compartment of cars with eight-cylinder engines: 1 – switchboard of coils of ignition N122, N192; 2 – control unit of the J220 engine; 3 – element of fastening of the relay and fuses; relay of power supply of the Motronic J271 system; J341 immobilizer relay; 4 – electric sockets lambda sensor of G39 and heater Z19 lambda sensor; 5 – G39 lambda sensor with Z19 heater; 6 – sensor of temperature of G62 cooling liquid; 7 – the sensor of temperature of the G42 air coming to the engine, 8 – the potentiometer of a butterfly valve of G69 integrated with the switch of idling F60; 9 – valve of stabilization of frequency of rotation of idling N71; 10 – sensor of frequency of rotation of the G28 engine; 11 – electric socket lambda sensor of G108 and heater of Z28; 12 – electric socket of the sensor of frequency of rotation of the G28 engine; 13 – G108 lambda sensor with Z28 heater; 14 – Hall's sensor G40; 15 – G66 detonation sensor; 16 – coils of ignition of cylinders 5-8, according to N164, N189, N190, N191; 17 – fuel nozzles of cylinders 5-8 according to N83, N84, N85, N86; 18 – the air adjusting valve of nozzles N212 (is established only on cars with a code of the AKG/AKJ/AKH engine (MVEG III) and OBDII; 19 – valve of switching of an inlet collector N156; 20 – G61 detonation sensor; 21 – nozzles of cylinders 1-4, according to N30, N31, N32, N33; 22 – coils of ignition of cylinders 1-4, according to N, N128, N158, N163; 23 – electromagnetic valve of the 1st adsorber N80; 24 – the G70 air consumption measuring instrument in the top section of the case of the air filter