Power supply system. Nissan Almera (from 1995 to 1999 of release)
Nissan Almera service from 1995 to 2000 in N15 body
1. General information
2. The general requirements to car repairs
3. Operation and car maintenance
4. Petrol engines
4.1. Removal and installation of the power unit
4.2. Dismantling and engine assembly
4.3. Block of cylinders
4.4. Shatunno-porshnevaya group
4.5. Cranked shaft and flywheel
4.6. Gazoraspredeleniye mechanism
4.7. Head of the block of cylinders of GA14DE and GA16DE engines
4.8. Head of the block of cylinders of the SR20DE engine
4.9. Cooling system
4.10. Greasing system
4.11. System of production of the fulfilled gases
4.12. Power supply system
4.13. Complex control system of the engine (KSUD)
5. Diesel engines
6. Transmission
7. Running gear
8. Steering
9. Brake system
10. Electric equipment
11. Body
12. Appendices
13. Electric equipment schemes
 







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4-12-sistema-pitaniya.html

4.12. Power supply system


Fig. 2.85. Details of a power supply system of GA14DE and GA16DE engines: 1 — a cover of a fuel tank; 2 — laying; 3 — a bulk pipe; 4 — a fuel tank; 5 — the fuel pump; 6 — the fuel level sensor; 7 — the fuel filter; 8 — a regulator of pressure of fuel; 9 — a stage; 10 — a fuel nozzle; 11 — the inlet pipeline; 12 — the sensor of temperature of cooling liquid;
13 — the HORN valve; 14 — the HORN pipeline; 15 — the sensor of differential pressure; 16 — the electromagnetic valve of HORN system; 17 — an absorber; 18 — an air inlet hose; 19 — the exhaust silencer of noise of an admission; 20 — the case of the air filter; 21 — a separator паров oils; 22 — the air filter; 23 — a cover of the air filter; 24 — the butterfly valve case; 25 — a regulator of the accelerated idling; 26 — an idling regulator;
27 — a measuring instrument of a mass consumption of air; 28 — the sensor of provision of a butterfly valve; 29 — a drive of a temperature regulator of the raised turns


The system includes the following basic elements: a fuel tank, the electric fuel pump shipped in a tank, a regulator of pressure of fuel, an idling regulator, sensors and four fuel nozzles (fig. 2.85). The steel stamped fuel tank capacity of 50 l fastens behind a body before a back axis.
In a power supply system the absorber — the filter with the absorbent carbon, providing absorption паров fuels with the subsequent their use is provided.

Fig. 2.86. Placement of the fuel pump with the sensor of the index of level of fuel (the pillow of a back seat is removed): 1 — the pipeline of a supply of fuel to nozzles; 2 — the drain pipeline; 3 — the contact socket of the fuel pump;
4 — the contact socket of the sensor of the index of level of fuel


The rotor electrogasoline pump connected to the fuel level sensor, is placed in a fuel tank. Indications of the sensor can be checked on tab. 2.8. The pump turns on the controler by means of the relay. A food on the relay moves with a delay about 5 pages. Access to the pump with the fuel level sensor is carried out via the hatch in a body floor under a back seat (fig. 2.86) a.proverka of a power supply system of the engine it is possible to carry out, using these tab. 2.9.

Table 2.8  fuel level sensor Check
The indication of the index of level of fuel in a combination of devices
Size А*
Resistance size between conclusions «1» and «3», Ohm
Arrow at the beginning of a scale
131
78-85
Arrow in the middle of a scale
86
27-35
Arrow at the end of a scale
36
4-6
*А - distance between the center of a float and a privalochny surface of the fuel level sensor.


Table 2.9  Check of a power supply system of the engine
That is checked
Check conditions
Result of check
Condition of system and way of elimination of malfunction
Chain of power supply of the fuel pump
The switch of ignition is switched on. Socket of the fuel pump расстыкован. Measure tension between a conclusion of "1" socket and "weight"
U= Uак.бат.
The chain of power supply is serviceable
U= 0
Break in power supply chain. The safety lock No. 17 in the assembly block of salon of the car burned down. Wire break between a conclusion of "1" socket of the fuel pump and a conclusion «5» sockets of the relay of turning on of the fuel pump. A wire breakage, suitable to the relay of turning on of the fuel pump. Malfunction of the relay of turning on of the fuel pump
Pressure of fuel in system
Be convinced of serviceability топливопроводов. Connect a control manometer between the fuel highway and the fuel filter. "Short-circuit" conclusions «3» and «5» sockets of the relay of turning on of the fuel pump. Turn on the ignition switch
R = 0
Inspect, stated in the previous point
R <2,45 kgfs/cm2
Press the drain pipeline. If pressure raises, replace a regulator of pressure of fuel. If pressure does not change, check tightness of fuel nozzles and carry out test with the new fuel pump
Р> 2,45 kgfs/cm2
Replace a regulator of pressure of fuel
Tightness of fuel system
Carry out the checks stated in the previous point, then press bringing and drain pipelines
Absence of considerable pressure drop in system during 10 mines
Normal tightness of system
Big pressure drop
Check tightness of fuel nozzles and pipelines. Eliminate thinnesses of connections


Supply voltage of the fuel pump of 12 Century.

Fig. 2.87. Placement of an absorber (1) and fuel filter (2)


The fuel filter of the Nissan type settles down in a back part of a motor compartment (fig. 2.87) on the left side. At installation the ring ledge should be focused up towards nozzles.
The Diafragmenny regulator of pressure of fuel provides constant pressure of fuel in a power supply system and supports idling the engine the following pressure:
— at disconnected from a pressure regulator a vacuum hose: 2,45 kgfs/cm2 for GA engines and 3,0 kgfs/cm2 for the SR20DE engine;
— at the attached hose: 2,94 kgfs/cm2 for GA engines and 2,4 kgfs/cm2 for the SR20DE engine.
The regulator of pressure of fuel is established to the left of a fuel stage.
Fuel electromagnetic nozzles provide fuel injection in cylinders and fasten to the fuel highway. Supply voltage of nozzles of 12 Century.
At constant pressure in fuel system in the unique parameter influencing amount of injected fuel, there is time of opening of nozzles.
The controler counts duration of opening of nozzles depending on the provision of a butterfly valve, loading and frequency of rotation of a cranked shaft, i.e.
time of quality of gas mixture necessary at every moment. It sends impulses of various duration on nozzles and supports an optimum dosage of fuel. Duration of injection of fuel increases during engine warming up a little. At warming up, and also in case of operation of the controler on the reserve program of a nozzle open at the same time. At a normal operating mode of a nozzle open serially according to an operating procedure of cylinders.
The replaceable dry air filter is located in the case over the inlet pipeline.
The case of a butterfly valve is established on the inlet pipeline. In the case the butterfly valve, the sensor of provision of a butterfly valve, a measuring instrument of a mass consumption of air, an idling regulator, a regulator of the accelerated idling (on cars with the conditioner), a drive of the automatic starting arrangement and the screw of adjustment of turns of idling settle down. The case is warmed with liquid from system of cooling of the engine.
The regulator of idling is executed in the form of the electromagnetic valve which changes cross-section section of the air pipe located bypassing a butterfly valve.
The regulator of the accelerated idling is established on the cars supplied with the conditioner, and provides increase of frequency of rotation of the engine idling at turning on of the conditioner. The regulator represents the electromagnetic valve of on-off type which changes cross-section section of the air pipe located bypassing a butterfly valve.
The temperature regulator of the raised turns of idling on the cold engine includes the thermosensitive element located on the pipeline of cooling liquid in the case of a butterfly valve. At start of the cold engine the thermosensitive element influences through a cam a control lever a butterfly valve, raising engine turns and by that accelerates its warming up.
The valve of a retsirkulyatsiya of the fulfilled gases (HORN) is fixed behind a head of the block of cylinders on the inlet pipeline on the left side. The valve operates giving in the inlet pipeline of a part of the fulfilled gases at the expense of the depression submitted from an inlet collector, and by means of the HORN electromagnetic valve. The depression attached to a membrane of the valve, is regulated by the valve of differential pressure.
Retsirkulyatsiya of the fulfilled gases leads to fall of temperature of burning that, in turn, reduces quantity of oxides of the nitrogen (NOX) being pollutants of environment and having especially harmful effects on a human body. The nitrogen containing in air, is oxidized oxygen at high temperature. Mixing of the fulfilled gases with arriving fresh air causes fall of the content of oxygen in soaked-up air and, as a result, fall of temperature of burning that reduces also quantity of NOX in the fulfilled gases. The valve of differential pressure is located behind a head of the block of cylinders on the inlet pipeline on the left side. The valve regulates the depression attached to a membrane of the valve of HORN system, depending on pressure of the fulfilled gases, determining by that amount of the fulfilled gases arriving in HORN system.

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4.13. Complex control system of the engine (KSUD)