Tachometer VAZ 2110 carburetor does not work

VAZ cars never cease to be improved. Now the latest models come off the assembly line with injection power units. Such engines are built according to a complex scheme of interaction between many sensors and an on-board computer. The article will reveal a number of reasons why the tachometer on the VAZ-2114 does not work.

The purpose of the tachometer, symptoms and causes of malfunction of this device will also be described. At the end of the article, a schematic diagram of connecting the engine revolution counter will be given.

What to do if the speedometer and tachometer stop working

As practice shows, failure of the speedometer and tachometer is a fairly common occurrence.
On the one hand, such breakdowns do not affect the basic functions of the car, but on the other hand, the driver does not receive important information, which can lead to more serious malfunctions or even an accident.

Therefore, if your speedometer stops working or the tachometer needle begins to “take on a life of its own,” you need to urgently take some action.

In this article we will look at what and how to do.

The tachometer does not work on the VAZ 2110 injector reasons

REASONS FOR A NON-WORKING TACHOMETER

The tachometer in a car is used to indicate the number of revolutions of the engine crankshaft. Let's look at why the tachometer doesn't work and how to find and eliminate the cause of the breakdown. We will definitely dwell on the device and principle of operation, which will help to find out why the tachometer stopped working, the needle twitches or behaves inappropriately.

CLASSIFICATION BY OPERATING PRINCIPLE

Mechanical or electromechanical tachometers with direct drive. The revolutions are transmitted to the dial indicator through a flexible shaft, which, through a worm gear, receives rotation directly from the crankshaft or one of the transmission shafts. The operating principle of the indicator is based on the phenomenon of eddy current induction. The operation and design of a magnetic tachometer are extremely similar to the operating principle of a car speedometer. In modern cars, a similar tachometer design is not used.

Electric machine. A distinctive feature is the connection to a generator. It is used primarily on diesel engines, but for the purpose of unification, a device of this type can also be used on gasoline engines.
Electronic. The signal can be taken either from the ignition system or directly from the computer. Installed on gasoline and diesel internal combustion engines.

DEVICE AND PRINCIPLE OF OPERATION

Main components of electric machine and electronic tachometers:

measuring unit, or signal converter. It can be based on elements of analog circuitry or built using special microcircuits;
display unit with analogue or digital display of the number of revolutions;
auxiliary elements.

The operation of electronic tachometers is based on the conversion of individual signals or pulses captured from the computer, ignition system or generator into a signal “understandable” for the display unit.

CONNECTION DIAGRAM

When looking for the reason why the tachometer does not work, it is first of all important to understand the connection diagram and the type of signal. There are 3 typical connection schemes:

to a contactless ignition system (the tachometer wire is connected to the primary circuit of the ignition coil). The operating principle is based on measuring the frequency of voltage surges in the primary circuit of the ignition system. Calculating the ignition angle is impossible without focusing on the number of crankshaft revolutions, therefore the sparking frequency directly depends on the crankshaft rotation speed. On 4-cylinder internal combustion engines, a full revolution of the crankshaft corresponds to 2 voltage pulses in the primary circuit. Accordingly, the higher the crankshaft rotation speed, the greater the frequency of voltage surges;

connection to the contact ignition system. The operating principle and connection diagram are similar to the BSZ, but the design of the measuring unit will differ depending on the voltage of the input circuit;

connection to the engine ECU. The principle of operation is still based on recording voltage pulses in the primary circuit of the ignition system, but the signal to the tachometer comes from the engine control unit;

connection to the generator (the tachometer signal contact is connected to terminal W of the generator). The rotation of the generator pulley is carried out by a belt drive from the crankshaft, so the rotation speed of the generator rotor will always be proportional to the crankshaft speed. The change in the number of revolutions of the crankshaft can be calculated by constantly measuring the amount of EMF generated on the winding. By its operating principle, an electric machine tachometer resembles a conventional voltmeter.

SPECIFIC FAULTS

If the mechanical tachometer on a car stops working, there is mechanical damage to any of the structural elements. A broken cable of a flexible shaft, wear of the worm gear elements, the appearance of backlashes, deformations - all these reasons can cause the engine speed indicator to fail.

What to pay attention to if the electronic tachometer does not work:

integrity of electrical wiring. In this case, it is important to check not only the signal wire, but also the ground and power supply of the instrument panel;
quality of contacts. The presence of oxides and loose contact inside the chips may well cause the tachometer to fail;
the integrity of the elements of the measuring unit, which are located behind the protective glass inside the dashboard. Among mechanical damage to transistors, burnout of microcircuits, tracks or swelling of resistors, the most common reason for a non-working tachometer is a violation of solder integrity. For example, on the Mitsubishi Padjero II, the appearance of microcracks in the soldering areas of the tachometer elements is a generally recognized disease.

On vehicles with an alternator connection, a non-functioning tachometer may indicate a faulty alternator. In this case, the breakdown is accompanied by the lighting of the low battery charge indicator and the sporadic lighting of a “garland” of warning lights on the dashboard.

In some types of design, changes in the linear resistance of high-voltage wires can make adjustments to the accuracy of the engine speed indication.

Connecting the trip computer

The mentioned diagram took into account only one, brown wire leading from the red block to the trip computer, but this is clearly not enough. Therefore, let's see how the pinout occurs here.

Connection diagram for tachometer VAZ-2108 and 2109

Let us immediately note that the fuel supply system – injector or carburetor – does not play a special role here. As you know, currently the most common are cars with the following engine types: gasoline or diesel. Depending on this, the tachometer is selected, unless, of course, it comes in the stock version. The thing is that on gasoline engines the tachometer reads data from the ignition coil, or rather, the impulses that arise here. However, the design of diesel power plants does not provide for this unit. Accordingly, here the tachometer reads pulses not from the ignition coil (for lack of one), but from the generator.

The first two wires (12-volt and Signal) are to contacts “B” and “K” of the ignition coil, respectively. All that remains is to secure the mass in any convenient place.

Schematic diagram of the tachometer electronics

Connecting modern electronic tachometers:

Read also: Repair kit for Kalina steering rack

A tachometer designed for a 4-cylinder engine cannot be installed on another, because the readings will be false. Therefore, select a tachometer in accordance with the make of the car and the number of cylinders.

VAZ tachometer connection diagram

A pulse must be generated for each short circuit of pin 2 to the common wire.

From the shaper, triggering pulses of an already defined size and shape B are supplied to the input of a waiting multivibrator assembled on transistors V2 and V4. The second step is connecting the tachometer to the diesel generator. If there are no problems, then the arrow will be at zero.

It is recommended to repair the tachometer exclusively at a car service center or service stations.

On the scale, zones of dangerous crankshaft speed are highlighted with colored lines.

Purpose

A car's tachometer is necessary to visually monitor engine speed. This control is very convenient for novice car enthusiasts and owners of cars with a manual transmission. On fuel-injected cars, the tachometer is also an additional means of monitoring speed for the on-board computer. Together with the crankshaft position sensors, speed and detonation sensors, the hog computer compares the received electrical impulses, thereby regulating the injection and oxygen saturation of the fuel.

Cigarette lighter failure

It is its malfunction that often causes the shield to fail. The fact is that many car owners turn on various devices through the cigarette lighter, for example, a special vacuum cleaner, chargers, pumps and other devices. Due to the fact that these gadgets require high current, either the socket itself or fuse F19 often breaks, as a result of which the instrument panel on the VAZ-2110 does not work.

In addition, the cigarette lighter may become damaged if left on for too long. In this case, you can return the instrument panel to functionality by disconnecting the socket block. But it is worth saying that such manipulation will be successful only if fuse F19 is functioning. If it does burn out, it must be replaced.

General diagram of devices

If you look from the back of the instrument panel, here it is in sequence - from top to left to right:

Fuel level indicator;
Combination of instrument lighting lamps;
Right turn control;
Left turn control;
Tachometer;
Next is the block, there are a lot of plugs in it;
And the top part of the dashboard is completed by an antifreeze temperature indicator.

VAZ 2110 dashboard connection diagram

The lower part of the dashboard (also from left to right and from the back of the dashboard). The following part of the instruments is located here:

high beam controller (bulb);
alarm controller;
brake fluid level control lamp;
speedometer;
CHECK ENGINE controller;
battery charge control;
parking brake controller;
oil pressure controller;
air damper controller in the carburetor;
outdoor lighting controller.

White block

The connector number, wire color and the unit (assembly) to which it goes are located in the white block as follows:

The first connector has a black wire. Its purpose is the body (mass);
In the second - red-brown - this is a low-voltage supply from the electronic control unit - tachometer;
The third, yellow one is also a tachometer, but this is a high-voltage supply from a coil;
The fourth, red-blue is Const from the battery + 12V, going through the sixth fuse;
The fifth, green-white - it is intended to indicate the coolant temperature;
Sixth, green-yellow – for size fuse F1;
The seventh connector does not have its own color and goes to the “choke”, the throttle valve;
Eighth, red and white - CHECK ENGINE light;
In the ninth and tenth there are 2 orange wires each, leading to 2 power fuses F19+12V;
In the eleventh there are 2 blue-brown wires leading to the “BK” terminal of the parking brake;
The twelfth, brown-white is the output “D” of the generator;
Thirteenth, gray and blue – for the oil pressure sensor.

Causes of malfunction on a VAZ 2110 with a carburetor

In the “ten” with a carburetor, torque is transmitted from the gear in the gearbox (gearbox) through a flexible shaft to the speedometer mechanism. In most cases, it is the shaft that may be causing the problem.

Flexible drive in the shell is the main cause of speedometer malfunction

If the speedometer stops working, first check the mounting points of the flexible drive . Tighten the nuts. If even after tightening the speedometer does not work, then the shaft has probably broken or there has been a breakdown in the mechanism on the instrument panel. In this case, the flexible shaft must be replaced. You can do this type of repair yourself. When installing a new drive, avoid extreme bending. Incorrect installation of the shaft will lead to unpleasant knocking.

If everything is in order with the flexible shaft and the instrument panel mechanism, then the problem is in the gear. It is located inside the checkpoint. We recommend that such repairs be carried out at a service station.

Why does the speedometer break?

It is worth noting that in some cases it is not difficult to repair the speedometer yourself.
In others, you will need the help of specialists. Thus, oxidation of contacts is considered a fairly easy to fix fault. It is characterized by the “jumping” of the arrow, despite the fact that the speed of movement remains stable. The problem is resolved by cleaning the contacts.

The wires are frayed. This reason can be suspected by the chaotic movement of the needle when starting the engine. Meanwhile, experts note that sometimes the problem does not manifest itself for a long time. It can be identified using a tester.

Sensor failure. A speed control device whose performance is questioned is replaced with a known good one. If the speedometer begins to function normally after this procedure, then there is no point in further looking for damage. Often sensors become unusable after their housing is destroyed and water or dirt gets inside.

Connectors. They are located in the VAZ-2110 in a place where they are constantly exposed to dirt. As a result, the contact is broken and the speedometer needle moves chaotically. The connectors must be completely cleaned and the connection must be checked for reliability.

Often the speedometer also begins to malfunction due to shaft wear. In this situation, it will be possible to get rid of the problem only after completely replacing the above-mentioned part.

Indicators

Dashboard

At the moment of ignition, all the lights on the instrument panel light up; after the engine starts, most of the indicators go out. Sometimes, even after starting the engine, one light continues to glow or even blink. This alarms drivers, because it is difficult to say which component in a VAZ 2110 car is malfunctioning; diagnostics are required to determine the breakdown.

We know that the “ten” can be old or new. In both versions, the designations remain identical, the only difference is the location of the light bulbs and their diagram.

At the bottom of the instrument panel there are indicators that indicate a malfunction in the operation of various systems of the VAZ 2110. If they continue to light when the engine is running, it means that repairs will have to be carried out.

We go from left to right:

The leftmost light, located on the instrument panel, refers to the air damper - the indicator is present in models with a carburetor engine;
Oil can icon. If the indicator lights up or flashes, it means that the oil compression in the power unit has dropped and the pump is not working properly;
The letter "P" inside a circle. The dashboard tells you that you forgot to turn off the parking brake;
A light indicating a faulty battery or generator. Perhaps the alternator belt has broken, there is an open circuit in the circuit, charging is not performed;
When the “high beam” is working, the headlight icon lights up on the panel;
On light bulb icon – the indicator shows the lights on;
"Check Engine" indicator. If it burns, then it is urgent to carry out diagnostics and subsequent repair of the VAZ 2110 engine; serious defects have appeared in the operation of the power plant. The best solution is to stop moving;
Directly above the faulty engine sign is a warning light.

In addition to these indicators, the front part is equipped with a display showing mileage. Also in this area are the clock and setting keys for it. In the “tens” of the new generation, the screen may be of a narrow format, but the layout remains the same.

Additional panel

New cars have an additional panel with useful indicators. A flashing icon depicting a person with a seatbelt informs you that you should fasten your seat belt - this applies to both the driver and his companions. While driving, the wheel icon may light up; there is a possibility that the pads are worn out and require repair.

Oil light - lights up when the oil level drops below normal - you should check the level as soon as possible.
Windshield washer - it tells us that the washer fluid is almost empty.
The thermometer above the container indicates an increased temperature of the coolant.
A crossed out arrow icon means the parking or brake lights are not working.

Expert recommendations

Some expert recommendations regarding diagnostics and repair of speakers:

Diagnosis of the cause of unit failure should begin with a visual inspection of the speed sensor, as well as the wiring connected to it. As practice shows, the reason often lies in a broken wiring, in particular, in the place next to the plug.
If the controller is covered with dust or oil, you need to dismantle it and wipe it thoroughly. Then you can put the sensor in place and try to check the performance of the speaker. There is a possibility that after these steps the speaker will operate normally.
Under no circumstances should you drive with a non-working speaker, so if problems are found in its operation and you cannot check it yourself, you need to seek help from a specialist.

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