Replacing the fuel level sensor VAZ 2112 16 valves injector

Fuel (gasoline) level sensor (controller) in the VAZ 2112 tank, also known as FLS

Have you started to notice that the fuel sensor is giving incorrect readings: when you start the engine, it shows an empty tank, but as soon as you start driving and gasoline begins to splash in the tank, the sensor readings change? You may need to replace the VAZ 2112 fuel sensor. However, let’s not rush and first figure out why the fuel level controller (FLS) does not work, and whether this problem can be solved by replacing it. Our instructions will help you understand the reasons for the malfunction, eliminate them and replace the controller if necessary. The price of the issue (the sensor itself) is within 100 hryvnia (400 rubles).

Note: The gasoline level sensor (controller) in the tank is designed to inform the driver, through an indicator on the dashboard, about the amount of fuel in the car’s tank. Its readings determine whether you will be able to reach your destination without refueling, or whether you will be stuck in a field, running out of gas and unable to refuel. Therefore, we advise you to pay attention to the behavior of the indicator on the dashboard more often in order to avoid troubles.

VAZ 2112: how to replace the fuel level sensor

Fuel (gasoline) level sensor (controller) in the tank of a VAZ 2112, also known as FLS
You began to notice that the fuel sensor gives incorrect readings: when you start the engine, it shows an empty tank, and as soon as you start moving, gasoline begins to splash in the tank - the sensor changes readings? You may need to replace the VAZ 2112 fuel sensor. However, let’s not rush and first figure out why the fuel level controller (FLS) does not work, and whether this problem can be solved by replacing it. Our instructions will help you understand the reasons for the malfunction, eliminate them and replace the controller if necessary. The price of the issue (the sensor itself) is within 100 hryvnia (400 rubles).

Note: The gasoline level sensor (controller) in the tank is designed to inform the driver, through an indicator on the dashboard, about the amount of fuel in the car’s tank. Its readings determine whether you will be able to reach your destination without refueling, or whether you will be stuck in a field, running out of gas and unable to refuel. Therefore, we advise you to pay attention to the behavior of the indicator on the dashboard more often in order to avoid troubles.

Causes of failure

Depending on the manifestation of the malfunction, the main causes of the breakdown can be determined. They can be divided into two main groups:

mechanical damage to the fuel level sensor located in the car tank;
Incorrect indicators displayed by the pointer on the dashboard.

That is, the cause of incorrect readings is either incorrect measurements or incorrect indicator readings on the dashboard.

The main sensor failures include:

depressurization of the float;
bending of the lever connecting the float to the sensor;
wear of the potentiometer sectors.

It is sector wear that is the most common problem with the fuel level sensor. Due to contact with the runner, the sectors wear out, after which a strip forms on them. Poor contact of the slider with the sectors leads to the fact that the indicator needle can jump, constantly show an empty tank, etc.

Bend of the lever usually occurs when the sensor is not carefully installed in the fuel tank. In this case, the indicator readings differ significantly from the real ones, up or down.

Failure to seal the float leads to fuel getting inside it. First, the float is partially immersed in fuel, and then it may completely drown. Naturally, this cannot but affect the accuracy of the fuel indicator readings.

Another common failure is the incorrect transmission of electrical current on the way from the sensor to the fuel indicator on the dashboard. Usually the breakdown consists of broken or acidified wires. In such a situation, the indicator needle usually just lies at zero. Well, the last type of wear is jamming of the movable winding of the indicator itself, which is why its needle cannot move.

Possible malfunctions and ways to eliminate them

Sensor readings jump

Tip: The most common malfunction of the gasoline level controller is associated with operational wear of the contact parts of its rheostat. You can verify this by measuring its resistance with an ohmmeter, smoothly moving the lever with the float on it from the left extreme position to the right (or vice versa). A faulty controller must be replaced

The cause of this problem lies in the erased tracks on the sensor rheostat board. They wear out under the influence of the runner. Sometimes bending the runner helps for a while; it becomes slightly higher than the worn parts of the tracks. If the abrasions are too great, then replacement is recommended.

The controller gives incorrect readings of the gasoline level

If the arrow on the dashboard of your VAZ 2112 car shows an incorrect level of gasoline, there are many reasons for such an ailment, as well as a number of ways to resolve them. If the fuel level readings are constantly lying (they either underestimate or overestimate the values), then adjusting the fuel controller will help you.

Adjusting the fuel level on the dashboard

Turn off the ignition and disassemble the dashboard.
Remove the arrow indicating the gasoline level from the pin and connect all the wires to the instrument connection.
We unscrew the fuel pump and take it out along with the sensor.
Turn on the ignition and wait about ten minutes.
Then we move the sensor spoke to the extreme position that would correspond to a full tank.
We set the pointer arrow so that it points exactly to the “1” mark and fix it.
We move the float spoke from the initial extreme position to the other.
The arrow readings on the instrument panel should also change from zero (corresponding to an empty tank) to o (corresponding to a full tank).
The indicator arrow shows the wrong amount of gasoline, then we slightly bend the right or left adjusting tabs so that the spoke can move beyond its left or right extreme location.

Common problems

The fuel volume control system in the gas tank is susceptible to the following malfunctions:

the pointer indicator lies at zero regardless of the amount of fuel remaining in the tank;
the device does not display the fuel level correctly - it is lying up or down;
the needle “jumps” or changes readings in a short period of time;
The yellow minimum fuel indicator indicator does not light up.

Reference. In some domestic car models, the fuel sensor is lying from the factory. An example is the Chevrolet Niva SUV of the first releases, where the device greatly underestimates the actual level of gasoline. The driver, guided by the sign, pulled into a gas station, only to discover that the tank was full to the top.

There are several reasons why the needle drops to zero:

Sticking or jamming of the lever.
The float lost its seal and sank to the bottom.
An electrical circuit is broken due to oxidized contacts or a wiring problem.
Failure of the indicator itself or the lever sensor - potentiometer.

Typically, incorrect readings and “jumps” of the needle are a consequence of contamination of the rheostat and slider. On a car with high mileage, these parts can wear out - the thin layer on the plates wears away, causing contact to disappear between them and the runner.

The fuel level sensor in the tank sends conflicting signals that are reflected on the dashboard.

One of the reasons for the minimum level indicator not working is a burnt-out light bulb on the instrument panel. Less common are problems with the end contact located inside the tank, or a break in the electrical wiring. In the newest systems, the lamp even lights up at the command of the controller when the resistance of the lever potentiometer reaches a certain value.

Selecting a new sensor

Replacing a fuel level sensor on a VAZ 2112 is not such a difficult process, however, it is more difficult to choose the right controller to replace the old one. So:

If you have no idea which gasoline level sensor to choose, then select it according to the following parameters.
We create a resistance instead of the sensor itself, and then measure it with a tester and find out the value of the resistance.
To do this, we need a special variable resistor rated at 1 kOhm; we connect it instead of the FLS.
With a full tank, the resistance is approximately 6-7 ohms.
We adjust the pointer to the “empty tank” position, then measure the resistance.
Based on the data received, we are looking for a new sensor with the appropriate resistance. The main thing when searching is that the nominal resistance of the new controller corresponds to the indicator readings.
In addition, you can use the instructions in the service manual.
Before buying a fuel sensor for a VAZ2112, you need to determine its markings.
There are many varieties of such sensors (controllers) (more than 8), and they practically do not differ in appearance.
The difference between them is the resistance, which is different for each type.
We strongly recommend purchasing a sensor with similar markings, otherwise you risk receiving false readings from the fuel controller, even if the system is fully operational.
For your information, the older your sensor, the more difficult it is to find it on sale (the oldest models are DUT-1).

Interchangeability of gasoline level controllers

For VAZ 2112 cars, there are two most common types of fuel level controllers:

For the so-called Vladimir combination of units (devices) and for Kursk (from JSC Schetmash).
For VDO.

Experts say that only the first digits are the most significant in the controller’s markings, and the numbers following them are insignificant modifications by the plant. Therefore, DUT-1-01 and DUT-1-02 are interchangeable, as well as DUT-2-01 and DUT-2-02, etc. If for any reason you remove the fuel pump, immediately replace its strainer at the same time.

Removing the fuel pump and replacing the fuel sensor on a VAZ 2112

Tool

Key for 17 and 5
Phillips screwdriver
Flat head screwdriver
Head for 7 with extension and ratchet

Let's start work

When the sensor is replaced, the VAZ 2112 fuel is drained to a level below half the tank. So:

Remove the terminals from the battery.
We take out the rear seat cushion.
Using a Phillips screwdriver, unscrew the two screws and remove the hatch cover.
Then disconnect the electrical connector from the pump (see photo below).

The fuel level in the gas tank on a VAZ-2112 is incorrectly shown, what should I do?

Car : VAZ-2112. Asks : Petrov Viktor. The essence of the question : It incorrectly shows the fuel level in the gas tank or does not show anything at all, it sits at zero.

Hello! I have a problem that the arrow does not correctly show the level of fuel that is in the gas tank. It happens that the arrow either increases or decreases the actual availability of gasoline, and recently it even started pointing to an empty tank, although I know for sure that there is still more than half there. What to do?

The most basic reasons for incorrect fuel level display on the VAZ-2112 instrument panel

It happens that the fuel level sensor fails, but there can be many reasons why the fuel level needle is lying, and in this article we will look at the most basic of them.

Fuel level surges

When the fuel level readings “jump”, showing one value or another, the malfunction may lie in the “abrasion” of the circuit board tracks on the fuel level sensor (located on the fuel pump in the gas tank - approx.). They are most often erased due to the impact of the slider on them. This problem can be solved by bending its base to the track, but if they are worn out too much, you will have to replace them together with the float.

Some of the tracks on the board have been erased.

Please note that if you are going to replace the FLS (fuel level sensor - approx.), be sure to look at its markings. Since there are many analogues for the VAZ-2112 sold, and the resistance values for them are all different. And if the sensor differs from the previous one, the problem will not disappear, since the readings will also be incorrect.

How does the device work?

To understand the problem yourself, you need to understand how the fuel level is measured and information is transmitted to the device indicator. The circuit implemented in most vehicles includes the following main elements:

a float made of lightweight polymer is immersed in the gas tank and is often combined with the pump block;
gasoline sensor – lever-type potentiometer (otherwise known as rheostat);
pointer arrow with scale;
connecting wires.

In many modern cars, an electronic control unit is connected to the system.

The classic rheostat is an open coil of high resistance wire. A lever equipped with a contact and attached to the float rises or falls with the level of fuel in the tank, and the contact moves along the turns of the winding. The classic scheme works simply:

The rheostat and the pointer device are connected in series in the circuit, both are powered from the vehicle's on-board network.
When moving the float with the lever, the resistance of the potentiometer changes.
A change in resistance causes an increase or decrease in the current in the circuit, to which the indicator arrow reacts. The scale is graduated according to the resistance values corresponding to the filling of the gas tank.

The updated version of the system works with the participation of a controller. The fuel level arrow receives a processed digital signal from the electronic unit that supplies power to the potentiometer. The principle of operation does not change, but the circuit allows you to obtain more accurate readings.

Adjusting the readings

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

Adjusting the fuel sensor (FLS) - removing the fuel pump

Preparing to remove the fuel pump

If in any position the arrow indicates incorrect values, then it is necessary to bend the adjusting tongues on this side so that the float rod can move to the right or left freely, depending on its location.

Adjusting the control arrow on the instrument panel

If the problem is the arrow on the instrument panel, then you need to remove the instrument panel and adjust it manually.

What to do

First you need to carry out diagnostics, that is, find out which part is damaged - the sensor, wiring or the indicator itself. For this, a regular multimeter is used, but you can replace it with a test lamp.

First you need to gain access to the fuel section and the fuel level sensor itself. To do this, with the car running, you need to remove the connector in the service hatch under the rear sofa of the car. Then, using the electrical supply diagram, you need to determine which wire goes from the sensor to the fuel indicator. One connector of the multimeter must be connected to the ground of the car, the other to the positive terminal of the wire coming out of the hole. The multimeter should show the on-board voltage (12 V). If you close the positive terminal to vehicle ground, the indicator arrow should show a full tank. If this does not happen, the wiring or the indicator itself is to blame. If the needle shoots up to the extreme position, the problem is in the fuel sensor.

Modern fuel sensors are best replaced as an assembly. Their price is not so high as to make repairs that do little to help the business. However, in some cases, you can try to clean the sensor from dirt and try to adjust the slider. To do this, you will have to remove the sensor (you must first drain the fuel, turn off the car and remove the negative terminal from the battery). After removing the sensor, you need to inspect the working surface of the sectors for wear. If the width of the wear line is small, you can adjust the slider so that it moves along the undamaged surface of the sectors.

We recommend: How to replace a low beam lamp on a Lada Kalina

If incorrect readings of the fuel level indicator are not associated with the fuel sensor, then you will have to remove the indicator from the dashboard. Wiring problems can also be diagnosed using a multimeter. The malfunction of the device itself is determined manually after removing the device - if the arrow is jammed, you can try to clean it and adjust it.

Doesn't show fuel level AT ALL

When the arrow points to “0” with a full tank, then attention should be paid to all contacts and connections:

First of all, this concerns the bolts located on the back side of the instrument panel, since they are the ones who create contact by fixing on the indicators.
It is possible that the fuel level needle has lost its position and needs to be adjusted.
The instrument panel itself may also be faulty. Since its mechanical parts are very susceptible to wear.
We test all the “negative” wires, especially the one located near the handbrake. Because often it is he who is promoted.
The float or the FLS itself is jammed.

Having analyzed all of the above, we can come to the conclusion that this whole problem lies entirely in the power supply system and the mechanical part of the fuel level sensor.

Please note that if you have an on-board computer (not older models - approx.), it is possible to control the fuel level electronically. You just need to enter the readings after each refueling of the car and the faulty FLS needle will no longer bother you.

Source

Messages 15

1 Topic by XXX9321 2014-02-16 14:28:34

XXX9321
New member
Inactive

Registration: 2014-02-16
Messages: 8 Thanks : 0
Auto: 2110

Subject: the tank fuel level needle is at zero, the light is not on

Guys, tell me the reason why the fuel level arrow of the tank does not show, it is at zero and the light does not light up and the on-board computer always shows a different liter of gasoline without filling it. I've already tried changing the plyvak together with the rheostat, the problem still hasn't been solved. thank you in advance

2 Reply from kapelkaK 2014-02-16 17:23:26

kapelkaK
Experienced
Inactive

From: Ramenskoye, Moscow.
Registration: 2013-12-16
Messages: 313 Thanks : 94
Car: VAZ 2111, 2001, 1.5; 8V; January 5.1; BK ShtatKh4m.

Re: the tank fuel level arrow is at zero, the light is not on

Look at the wiring, there may be a break or the contacts on the chips have become sour.

3 Reply from delaisam 2014-02-16 22:55:29 (2014-02-16 22:59:59 edited by delaisam)

do it yourself
Participant
Inactive

Registration: 2012-10-24
Messages: 80 Thanks : 30

Re: the tank fuel level arrow is at zero, the light is not on

At least you can remove the wires from the sensors and apply a negative signal to them from the body. It is unlikely that both sensors failed at once, but rather something in the instrument cluster or in connectors or wiring. After removing the seat and seeing the connector for the sensor and pump, we find the pink wire, apply ground to it (-) and when the ignition is on, the needle should deflect completely, if not, then remove the instrument cluster from the panel without disconnecting the wires from it, turn on the ignition and connect to ground (-) right pin of the indicator, which connects to plug 10 of the red block (X2) of wires. If the device is working properly, the needle should deflect completely as if the tank is full. Based on the results, we draw conclusions whether it is wiring or a pointer. If indicator lamps such as an oil pressure lamp operate in the instrument cluster; parking brake lamp; battery charge lamp; The coolant temperature indicator is working, then probably with power (+) through the wires to the instrument cluster everything is in order, it comes to (X1) on the 10th plug, there may be damage on the board, they will be obvious or there is poor contact in the red connector of the device (X2) . The most likely place for damage to the wires is in the area of the rear seat cushion, under it and the area of the heels of the rear passenger. Picture for description of verification methods (clickable):

4 Reply from Sergey VAZ 2111 2014-02-17 11:46:35

Sergey VAZ 2111
Connoisseur
Inactive

Registration: 2013-11-21
Messages: 513 Thanks : 145
Car: VAZ 2111

Re: the tank fuel level arrow is at zero, the light is not on

Yes I agree. If you changed the fuel level sensor and everything is still the same. Look for a bad electrical connection. And check the light bulb for damage. Maybe she's burned out?

5 Reply from XXX9321 2014-02-18 00:21:07

XXX9321
New member
Inactive

Registration: 2014-02-16
Messages: 8 Thanks : 0
Auto: 2110

Re: the tank fuel level arrow is at zero, the light is not on

Yes I agree. If you changed the fuel level sensor and everything is still the same. Look for a bad electrical connection. And check the light bulb for damage. Maybe she's burned out?

The light bulb works but I'll have to look at the wiring