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Power system
| Fig. 2.85. Details of the power supply system of engines and GA14DE GA16DE: 1 - a cover of the fuel tank; 2 - a lining; 3 - filler pipe; 4 - the fuel tank; 5 - the fuel pump; 6 - the gauge of level of fuel; 7 - the fuel filter; 8 - the fuel pressure regulator; 9 - ramp; 10 - the fuel injector; 11 - the inlet pipeline; 12 - coolant temperature sensor; 13 - EGR valve; 14 - EGR conduit; 15 - differential pressure sensor; 16 - solenoid valve EGR system; 17 - absorber; 18 - a hose of the air intake; 19 - the air resonator; 20 - the air filter; 21 - Oil vapor separator; 22 - air filter; 23 - a cover of the air filter; 24 - the throttle body; 25 - a regulator of the accelerated idling; 26 - a regulator of idling; 27 - Air mass meter; 28 - throttle position sensor; 29 - Drive the thermostat higher rpm
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The system includes the following main elements: a fuel tank, the electric fuel pump submerged in the tank, the fuel pressure regulator, the regulator of idling, sensors and four fuel injectors (Fig. 2.85). Fabricated steel fuel tank capacity of 50 liters is mounted behind the body in front of the rear axle. In the power supply system is provided absorber - the activated carbon filter, absorbs the fuel vapors and their subsequent use.
| Fig. 2.86. Placing the fuel pump to the fuel gauge sender (cushion rear seat removed): 1 - the fuel feed line to the nozzles; 2 - the drain pipe; 3 - pin connector of the fuel pump; 4 - pin sensor fuel gauge
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Rotary elektrobenzonasos connected to the fuel level sensor is arranged in the fuel tank. Sensor readings can be checked on the table. 2.8. The pump is activated by the controller using a relay. Power is supplied to the relay with a delay of about 5 seconds. Access to the pump with fuel level sensor through a hatch in the floor of the body under the rear seat (Fig. 2.86) .Proverku power supply system of the engine can be performed using the data in Table. 2.9.
Table 2.8 Check the fuel level sensor Reading the fuel gauge in the instrument cluster | Dimension A * | The resistance between the terminals "1" and "3", Ohm | The arrow at the beginning of the scale | 131 | 78-85 | The arrow in the middle of the scale | 86 | 27-35 | The arrow at the end of the scale | 36 | 4-6 |
* A - distance between the center of the float and the mating surface of the fuel level sensor.
Table 2.9 Verification of engine power What is checked | Test conditions | Result of checking | System Status and Remedy | Power supply circuit of the fuel pump | The ignition switch is turned on. Plug the fuel pump undocked. Measure the voltage between terminal "1" connector and "weight" | U = U ak.bat. | POWER SUPPLY OK | U = 0 | Open circuit power. Blown fuse number 17 in the mounting block of the car. Broken wire between terminal "1" of the fuel pump connector and terminal "5" connector of the fuel pump relays. Broken wires suitable to enable the fuel pump relay. Malfunction of the fuel pump relays | The fuel pressure in the system | Make sure the fuel lines in good condition. Connect the pressure gauge between the fuel line and the fuel filter. "Short-circuit" conclusions "3" and "5" connector of the fuel pump relays. Turn the ignition switch | R = 0 | Spend test set out in the preceding paragraph | P <2.45 kg / cm 2 | Clamp the drain pipe. If the pressure rises, replace the fuel pressure regulator. If the pressure does not change, check the tightness of the fuel injector and run the test with a new fuel pump | P> 2.45 kgf / cm 2 | Replace the fuel pressure regulator |
The tightness of the fuel system | Spend test set forth in the preceding paragraph, and then press a supply and drain pipes | No significant pressure drop in the system for 10 minutes | Normal system for leaks | Large pressure drop | Check the tightness of fuel nozzles and piping. Eliminate leaks connections |
Power supply of the fuel pump 12 V.
| Fig. 2.87. Placement of the absorber (1) and the fuel filter (2)
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Nissan type fuel filter is located in the rear of the engine compartment (fig. 2.87) on the left side. When installing the annular projection must be oriented upwards towards the injectors. Diaphragm fuel pressure regulator provides a constant fuel pressure in the fuel system and supports the idling engine following pressure: - When disconnected from the pressure regulator vacuum hose: 2.45 kg / cm 2 for the engines of GA and 3.0 kgf / cm 2 for the engine SR20DE; - When attaching the hose: 2.94 kg / cm 2 for the engines of GA and 2.4 kgf / cm 2 for the engine SR20DE. The fuel pressure regulator is set to the left of the fuel rail. Electromagnetic fuel injector can inject the fuel into the cylinders and attached to the fuel line. Power supply nozzles 12 V. At constant pressure in the fuel system, the only parameter that affects the amount of fuel injected, is the opening of the nozzles. The controller calculates the duration of the opening of the nozzles depending on throttle position, load and engine speed, ie, required at each time the quality of the combustible mixture. It sends pulses to the nozzles of varying duration and supports the optimal dosage of fuel. The duration of injection increases slightly while the engine warms up. When warming up, as well as in the case of the controller for the backup program injectors open simultaneously. In normal operation, the nozzle opening alternately in accordance with the working cylinder. Replacement HEPA filter disposed in the housing above the intake manifold. The throttle body is mounted on the intake manifold. The building has throttle, throttle position sensor, mass air flow meter, idle control, idle control fast (on cars with air conditioning), the drive automatically starting device and screw the idle adjustment. The body fluid is heated by the engine cooling system. Idling regulator is designed as a solenoid valve, which changes the cross section of the air duct, located in the bypass throttle. Fast idle speed controller is installed on vehicles equipped with air conditioning, and enhances the engine speed to idle when you turn on the air conditioner. The regulator is an electromagnetic type on-off valve, which changes the cross section of the air duct, located in the bypass throttle. Thermostat elevated idle speed of the engine is cold involves thermally responsive element disposed on the coolant pipe inside the throttle body. When starting a cold engine temperature sensor acts via a cam lever throttle control, increasing the engine speed, and thereby accelerates the warming. Valve exhaust gas recirculation (EGR) is fixed behind the cylinder head intake manifold on the left side. The valve controls the intake manifold part of exhaust gases by vacuum applied from the inlet manifold, and through the EGR solenoid valve. The vacuum applied to the membrane valve, the differential pressure regulated valve. EGR lowers the combustion temperature, which in turn reduces the amount of nitrogen oxides (NOX), which are environmental pollutants, and particularly harmful to the human body. The nitrogen contained in the air is oxidized with oxygen at high temperature. Mixing exhaust gas with the incoming fresh air causes a decrease in the oxygen content of the intake air and as a result, lowering the combustion temperature, which reduces the amount of NOX in the exhaust gases. Differential pressure valve located behind the cylinder head intake manifold on the left side. The valve regulates negative pressure applied to the diaphragm valve EGR system, depending on the exhaust gas pressure, thereby determining the amount of exhaust gas entering the EGR system.
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