With an empty tank shows full. Pointer "lying", works with interruptions

Diagram of the compounds of the instrument panel VAZ 2110, VAZ 2111, VAZ 2112 (view from back side):

1. Fuel reserve control lamp;
2. Lamps lighting the device combination;
3. Right turn control lamp;
4. Reference lamp of the left turn;
5. Backup control lamp;
6. Coolant temperature pointer;
7. Control lamp outdoor lighting;
8. Control lamp of the carburetor air damper;
9. Oil pressure control lamp;
10. Control lamp of the parking brake;
11. Control lamp charge rechargeable battery;
12. Tachometer;
13. Check Engine control lamp;
14. Speedometer;
15. Control lamp level of brake fluid;
16. Warning control lamp;
17. Control lamp far Light headlights;
18. Fuel level pointer. Plugs 2, 3, 8, 9 in the Kh2 pad are the outlines of the speedometer 14

Temperature:
When the pointer arrow is constantly at the beginning of the scale, when the ignition is turned on, disconnect the wire from the temperature pointer sensor and connect the tip of the wire with the "mass". If the arrow is rejected, then, therefore, the temperature sensor of the VAZ 2110, VAZ 2111, VAZ 2112 and must be replaced. If the arrow is dismissed, remove the VAZ 2110 dashboard, VAZ 2111, VAZ 2112 and, without disconnecting from the wires panel, turn on the ignition and connect with the "mass" left output of the temperature pointer, which is connected to the plug 5 (see Fig. 7-49 ) White pads (x1). The deflection of the arrows in this case will indicate the serviceability of the device and the damage to the wire connecting the sensor and the pointer. When the arrow of the pointer is constantly in the red zone, when the ignition is on, disconnect the wire from the VAZ 2110 temperature sensor, VAZ 2111, VAZ 2112. If the arrow returned to the beginning of the scale, the sensor is faulty. If the arrow remains in the red zone, then or the wire has a "mass" closure, or the device is damaged. The device service can be checked by disconnecting from a combination of automobile instruments a white block (x1) of wires and connecting with the "mass" plug 1 and with a plus terminal of the battery Plug 10 white pads of the VAZ 2110 instrument combination, - 2111, - 2112. In this case In a serviceable device, the arrow should be at the beginning of the scale.
Fuel:
The method of verification is similar to those described above. When the arrow of the VAZ 2110 - 2112 pointer is constantly at the beginning of the scale and does not deviate after closing the "mass" of the pink wire tip, disconnected from the fuel level sensor 2110, VAZ 2111, VAZ 2112, then it is necessary to check the device. To do this, remove the combination of instruments of VAZ 2110, VAZ 2111, VAZ 2112 and without disconnecting the wires from it, turn on the ignition and connect with the "mass" of the right output of the pointer, which is connected to the plug 10 of the red shoe (x2) of the wires. With a serviceable device, the arrow must deviate until the end of the scale. If the fuel level arrow is constantly against the "1" mark, then the device service can be checked by disconnecting from dashboard VAZ 2110, VAZ 2111, VAZ 2112 red (x2) Wire block. In this case, the device has a good device when the ignition is turned on, the arrow must be against the mark "0".

The fuel level meter in the tank is a fairly simple mechanism, to understand which any car enthusiast can be able to work with the basic level of technical knowledge. Consider why the fuel level sensor does not work, as well as the methods of eliminating all the breakdowns are possible (the arrow twitches, "lying" shows only a complete or empty tank).

Conditions for correct work

If you have not previously encountered electrical devices and do not know the principle of operation of the fuel leveling system, check out the following concepts:

• a variable resistance (row) is a device with which you can adjust the resistance value. The more resistance in the chain, the smaller the current flows in it;
• pointer Fuel Level (Out) - element of the instrument panel, indicating the amount of fuel in the tank. May be analog or electronic;
• fuel Level Sensor (Dut) - the meter located in the tank.

Most of the fuel level indication systems in the tank operate according to a single principle. In the tank there is a float, on the opposite part of which is a sliding contact. Sliding contact moves along the plate with contacts (resistive substance), rigidly fixed on the meter housing. Moving the sliding contact changes the amount of resistance, thereby increasing or reducing the value of the current passing in the chain. The smaller the resistance, the larger It flows into the circuit and the greater the arrow of the fuel level pointer.

The chain includes:

The principle of operation is described by a lever type, but in the case of a tubular type meter, the difference only in the method of changing the resistance in the chain. Tubular type meters can be found on BMW. In the new generation of car VAZ and foreign production models, they are most commonly lever type and is attached to the plastic housing of the pumping section.

Control lamp

One of the contacts of the lamp signaling a low fuel level can be attached to the row. In this case, with a decrease in the volume of combustible resistance in the circuit, it drops so much that the current values \u200b\u200bbecomes sufficient to ignite the lamp.

In some systems, a separate thermistor is included in the lamp chain (resistance depends on its temperature). The thermistor is fixed in the pump section housing. When the amount of gasoline / diesel is reduced to a certain level, it ceases to be washed and cooled by fuel. The current current heats the thermistor, reducing its resistance. With a decrease in resistance, a light bulb on the dashboard begins to light up.

Fault

For what reasons may not work the fuel level pointer:

• lack of good contact on any of the chain sites (wires, oxidation in connectors, cracks in placing places);
• malfunction of the dashboard indicator (for example, breakdowns of soldering);
• disconnecting the float from sliding contact;
• burned fuse;
• no contact between resistive track and sliding contact. The cause can be the formation on the surfaces of oxides, plaque, weakening the pressure of the sliding contact to the resistive layer, the abrasion of the tracks of the resistive layer.

Pointer "lying", works with interruptions

The reasons for which the pointer incorrectly shows the fuel level in the tank:

• the presence in the chain of additional resistance (oxidation in places of connectors, poor contact of the mass, the formation of oxides, deposition on the resistive layer and the sliding contact);
• defect casting the float, which is why it is filled with fuel. The breakdown is extremely rare, but still it is possible, however, as a bending of the traction float due to mechanical impact with unqualified repair;
• the formation of plaque on the guide rack (characteristic only for tubular type sensors). In this case, the deployment movement will be difficult.

Arrow always shows full tankIf in the system:

• there was a separation of the float from the sliding contact (in this case, the slider will always be in the extreme position);
• the wire, which goes to the pointer, is somewhere around the mass, which is why resistance decreases in the circuit.

The twisted arrow of the Outflow testifies to the partial abrasion of the resistive path of the potentiometer. This will be the cause of interruptions in the operation of the pointer. Since most often the car is used with fuel tankfilled by 40-60%, then it is in this range that the abrasion of the resistive layer comes faster. Therefore, the pointer can work regularly only when the position of the sliding contact falls on the intact resistive layer.

Diagnosis with your own hands

To find the reason why the fuel level sensor does not work, you will need a multimeter (we recommend reading,) and the control. First of all, it is necessary to determine - the reason for breakage in the sensor located in the tank or in the index. To do this, remove the connector connected to the fuel section (located at the gas tank hatch, access to which is in most case there is from the cabin). According to the electrical wiring scheme of your auto model, determine which of the wires goes to the dashboard pointer. Turn on the ignition, after which through control lamp Submit a minus potential to the appropriate IDU. If the arrow of the pointer rapidly headed up, then the problem in the sensor. For further diagnostics, it is necessary to get the fuel section. The multimeter will allow you to measure the resistance of the potentiometer.

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Asks: Petrov Victor.
Essence of the question: Incorrectly shows the level of fuel in the gas tank or does not show anything at all, it sits in zero.

Hello! I have such a problem that the arrow incorrectly shows the fuel level, which is in the gas tank. It happens that the arrow increases, it reduces the real availability of gasoline, and recently began to point to an empty tank at all, although I know for sure that there is even more than half. What to do?

The most basic reasons for not the right display of the fuel level on the VAZ-2112 instrument panel

It happens that the fuel level sensor fails, but the reasons for the fuel level arrow can be a lot, and in this article we will look at the most basic.

The Following Two Tabs Change Content Below.

All my life was surrounded by cars! First, in the village, I am already in the first grade on the tractor in the fields, then I was Java, after a penny. Now I am a third-course student "Polytech" at the automotive faculty. We carry out an autoslemer, helping to repair cars with all your friends.

Racing fuel levels

When the fuel level readings "jump", showing one one, then another value, the malfunction can be in the "abrasion" of road tracks on the fuel level sensor (located on fuel pump In the gas tank - approx.). They are erased most often due to the impact on them runner. It is possible to solve this problem to be fed up its base to the track, however, if they are too much, they will have to change them assembly with the float.

Part of the tracks on the board washed.

Please note that if you are going to replace Dut (fuel level sensor - approx.), Be sure to look at its marking. Since the analogs for the VAZ-2112 are selling a lot, and the resistance values \u200b\u200bfor them are all different. And if the sensor is different from the previous one, the problem will not disappear, since the testimony will also be incorrect.

Adjusting indications

If the arrow periodically increases and lowers the values, then in this case the adjustment will help.

Adjusting the fuel sensor (dout) - removal of fuel pump

If, in any position, the arrow indicates incorrect values, then it is necessary to adjust the adjusting languages \u200b\u200bfrom this side, so that the battlefield can move to the right or left freely, depending on its location.

Adjustment of the control arrow on the instrument panel

If the problem lies in the arrow on the instrument panel, then you need to remove the instrument panel, and adjust it into manual.

Does not show the level of fuel at all

When the arrow indicates "0" with full tank, attention should be paid to all contacts and connections:

1. First of all, it concerns the bolts located on the reverse side of the instrument panel, since they make contact locking on the signs.
2. It is possible that the fuel level arrow has been confrontated and its adjustment is required.
3. . Since its mechanical parts are very susceptible to wear.
4. We test all the "minus" wires, especially this applies to the one that is located manual brakes. Because it is often precisely it is worked out.
5. Clinical float or Dut.

After analyzing all the above, it can be concluded that the whole problem lies entirely in the power supply system and the mechanical part of the fuel level sensor.

Note that when (not old models - approx.) It is possible to control the level of fuel in electronic mode. It is enough just to enter the testimony, after each vehicle refueling and the defective arrow of the Dut, will no longer be disturbed.