Fig. 207. Location of Simos injection system components in the engine compartment of a 2.0-liter engine: 1 - tank with activated carbon; 2 - electromagnetic valve; 3 - nozzle; 4 - fuel supply pressure regulator; 5 - four-pin plug connector; 6 - high voltage transformer; 7 - EGR valve; 8 - Simos injection and ignition system control unit; 9 - three-pin plug connector; 10 - central plug block; 11 - three-pin plug connector; 12 - speed sensor; 13 - ignition distributor with Hall sensor; 14 - engine crankshaft speed sensor; 15 - coolant temperature sensor; 16 - knock sensor; 17 - connection to "mass"; 18 - throttle body; 19 - mass air flow sensor; 20 - intake air temperature sensor; 21 - air filter
Fuel under pressure, the value of which is maintained by pressure regulator 4 (Fig. 207), is continuously supplied to injectors 3, which are installed directly in front of the intake valves. ECU 8 calculates the duration of the injection pulse, and therefore the composition of the combustible mixture, depending on the following parameters:
- throttle position;
- degree of vacuum or pressure value in the intake manifold;
- engine crankshaft speed.
The electric fuel pump draws fuel from the tank and delivers it under pressure to the fuel rail. The pressure regulator controls the amount of fuel returned to the tank and maintains a constant fuel pressure to the injectors.
Based on the information received from the sensors, the ECU generates fuel injection time pulses. If any sensor fails, the ECU switches to the "default" operating mode with reduced efficiency based on the fixed parameters stored in the ECU memory unit.
The arrangement of the injection system components in the engine compartment of the 2.0-liter Simos engine is shown in Fig. 207.
The electronic injection system consists of the following elements:
- activated carbon tank 1 is located in the right wheel arch;
- solenoid valve 2 opens and closes the connection between the activated carbon tank and the engine;
- mass air flow sensor 19 is located between the air filter and the intake hose;
Fig. 208. Location of Simos injection system components on a 2.0-liter engine: 1 - air filter; 2 - intake air temperature sensor wire tip; 3 - tip of the wire of the activated carbon cleaning system; 4 - to the crankcase; 5 - fuel hose, white mark; 6 - upper part of the intake manifold; 7 - O-ring; 8 - bolt, 16 Nm; 9 - gasket, replace with a new one; 10 - bolt, 10 Nm; 11 - bolt, 25 Nm; 12 - injector wire tip; 13 - lower part of the intake manifold; 14 - to the connection on the cylinder head; 15 - to the expansion tank; 16 - ECU; 17 - clamp; 18 - ECU holder; 19 - Multi-contact plug socket; 20 - spring retaining clamp; 21 - coolant temperature sensor; 22 - wire tip for (21); 23 - wire tip for (24); 24 - engine crankshaft speed sensor; 25 - spacer ring; 26 - plug connector for lambda probe and lambda probe heating; 27 - lambda probe; 28 - Air intake hose; 29 - Throttle body plug connector; 30 - recirculation hose, blue mark; 31 - mass air flow sensor wire tip
- four-pin plug 5 is connected to lambda probe 27 (Fig. 208) and lambda probe heating;
- valve 7 of the exhaust gas recirculation system is now increasingly referred to as the EGR valve;
- The ECU 8 of the Simos injection system and the associated ignition system is located behind the instrument panel;
- 3-pin connector block 9 of the knock sensor, brown;
- plug connector 10 engine speed sensor black;
- a Hall sensor is installed in the ignition distributor 13;
- coolant temperature sensor 15, black, is also the sensor of the remote thermometer located on the instrument panel;
- the functions of the knock sensor 16 and ignition coil 6 are described in section 8;
- the 12 speed sensor informs the ECU about the current speed of the vehicle;
Fig. 209. Lower part of the intake manifold and air filter with fastening: 1 - fuel distribution line; 2 - bolt, 10 Nm; 3 - safety clamp; 4 - O-ring seal; 5 - fuel supply pressure regulator; 6 - upper part of the air filter; 7 - intake air temperature sensor; 8 - rubber nozzle (pay attention to the correct installation); 9 - air filter element; 10 - lower part of the air filter; 11 - electromagnetic valve, activated carbon tank; 12 - rubber bushing; 13 - rubber nozzle; 14 - rubber gasket; 15 - mass air flow sensor; 16 - bolt, 10 Nm; 17 - sealing ring; 18 - nozzle; 19 - lower part of the intake manifold
- sensor 7 (Fig. 209) informs the ECU about the intake air temperature;
- sensor 14 (Fig. 207) informs the ECU about the specific engine crankshaft speed.
The Simos system ECU includes a memory unit or storage device that records all failures (malfunctions) that occur during operation, and has three operating modes:
- reading of faults recorded in memory (malfunctions), occurred during engine operation;
- vehicle components and systems testing mode;
- diagnostic mode for faults in injection and ignition systems when the engine is stopped.
The operating modes are requested via the diagnostic connector.
Erasing fault information from the memory device is only possible after at least a single reading of the codes (mode No.1) or after eliminating the detected faults (modes No.2 and 3).
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