Idle speed sensor on Lada Grante: where is it located and how to replace it

The main reason for the unstable operation of the Lada Granta engine at idle is a malfunction of the regulator , throttle position sensor.

Note to the driver!

The Lada family, starting from the Priora, is equipped with an electronic throttle position control system. Previous models used a mechanical type of drive (cable).

Systematic use of equipment leads to wear and unstable operation. The process of self-prevention and replacement is simple, but requires attentiveness on the part of the master.

Using the example of a Lada Granta car, we will consider a step-by-step algorithm for replacing the idle speed sensor.

Signs of failure, need to replace IAC, TPS

• Difficulty starting the engine “cold” or “hot”;
• floating idle , unstable engine operation;
• increased fuel consumption;
• the accelerator pedal is uninformative;
• vibration in the car interior, vibration of the steering wheel;
• reduced acceleration dynamics;
• the car stalls when driving downhill;
• when you press the accelerator pedal, periodic dips and speed jumps are noticeable;
• increased consumption at idle.

Clutch and brake sensors Lada Granta

Thanks to the signals sent by these sensors, the controller receives information about whether the corresponding pedals (clutch and brake) are pressed or not pressed. Both elements are located in the area of ​​the pedal assembly.

The clutch sensor is a stabilizer, which from a design point of view is a limit switch. Its failure will lead to surges in speed and unstable operation of the engine. The car owner will be informed about the breakdown by the illuminated Check Engine; in addition, problems will appear with sudden jumps in speed during gear shifts.

The above is evidence of the following malfunctions:

• the height of the pedal is incorrectly positioned relative to the floor;
• clutch sensor is faulty;
• there are disturbances in the circuit.

They also began installing brake pedal sensors on Grants. However, many owners of this car, after only using it for a short time, notice error P0504, indicating a breakdown of this sensor. In most of these cases, the above error occurs due to incorrect adjustment of the element. For this reason, car owners report symptoms such as:

• unstable engine operation;
• instability of speed.

Functionally, the brake pedal sensor is responsible for the position of the pedal itself and turning off the brake lights. In addition to its misalignment, problems with this part can be caused by a breakdown of the spring located inside the sensor.

The presence of a malfunction will be confirmed to the owner by the illuminated Check Engine and the already mentioned error P0504. This error is a consequence of a breakdown of either the sensor itself or its wiring. In addition, the cause of the error is often the misalignment already mentioned above. The new element will cost the car enthusiast approximately 180 rubles.

Causes of breakdowns of idle speed sensors

External air leakage is the first and main reason for unstable operation of the ignition system and fuel equipment. The electronic engine control unit (hereinafter referred to as the ECU), while scanning the readings, “does not know what to do with” the excess air.

The breakdown indicator lights up on the dashboard, the car speed fluctuates, and the air consumption increases.

The second most common reason is systematic jamming of the mechanisms in the ventilation valve. As a result, the tachometer needle shows speeds from 850 to 1250 rpm, and the idle speed is unstable.

Completes the “top three”: a lean mixture entering the cylinders for subsequent ignition.

Sensor

Preparatory stage before installing the idle speed sensor

Necessary tools, materials:

• screwdriver with magnetic tip;
• calipers;
• tester;
• stationery knife;
• torque wrench;
• idle speed controller (hereinafter referred to as IAC);
• throttle position sensor (hereinafter referred to as TPS);
• rags;
• additional lighting;
• liquid for removing deposits and rust WD-40.

Elimination of floating speeds

• heads with a ratchet, and their size should be 6 and 8;

• neutral sealant, when purchasing, pay special attention to ensure that it is odorless;

• Silicone Grease;

You need to disconnect and remove the throttle cable stopper from the lever. This work must be done specifically on the throttle assembly. Next you will need to remove the resonator and air pipe. Using TORX T-25 heads and bits that were previously purchased, you need to unscrew the air filter shell. To be able to carry out this work with maximum convenience, you need to remove the wire from the exhaust receiver and all associated fasteners going to the throttle assembly.

Now, having removed the obstacle from the throttle assembly, unscrew all the bolt heads using a ratchet head to do this job. Only after this will it be possible to remove the remote control and remove the rubber rings that serve as a seal at the two ends of the throttle valve. All grooves need to be cleaned as much as possible and the FUM tape should be wound around them in a circle, about 15 times, and on the small pipe - about 10 times.

Only after completing this work can you begin to fully assemble the elements into a single whole. It would also be useful to use a clamp when securing the channel hose and the tube leading to the vacuum booster. This is necessary to further prevent air leaks in the connections.

To check whether the speed on the Lada Granta is floating, look at the IAC sensor. It is located on the throttle body, therefore, in the same place as the sensor responsible for the throttle position. It is secured with two mounting screws. In order to verify its functionality, one multimeter will be enough.

If the vehicle readings are normal, it should be within approximately 80 ohms. In the same case, if the indicators turned out to be significantly higher than the IAC norm, it will be necessary to replace it.

At the moment when the ignition is turned on directly, the rod located on the regulator fully extends and rests against a specially made calibration hole. It is located directly in the throttle pipe. After this, the sensor begins to count steps until the required time and returns the valve to its original state upon completion of operation.

Sequence of actions when independently replacing IAC and TPS sensors

1. We place the machine on a level platform and ensure priority safety measures during repairs.
2. We open the hood, an air duct with a receiver is laid above the engine. The Lada Granta with 8 and 16 valves has plastic, while in previous Lada models it is aluminum.

Air vent with receiver

1. We press out the plastic clamp of the block with wires.

Plastic retainer

1. Disconnect the contacts of the electronic gas pedal.

Electronic pedal contacts

1. Using a Phillips screwdriver, unscrew the two screws securing the IAC to the throttle body.
2. We remove the IAC from the cavity of the throttle assembly.

Removing the IAC

1. Next, we proceed to unscrew the TPS, it is installed a few centimeters lower.
2. We unscrew the two screws, remove the TPS, and disconnect the block with the wires.

Retrieving the TPS

Note to the driver! When removing the valve, be extremely careful not to lose the rubber bushing.

1. We carry out troubleshooting of the seat of the IAC and TPS. We clean the rust deposits with a rag and use WD-40 aerosol as needed.
2. Screw in each of the sensors one by one and connect the connectors with wires.
3. We start the engine and check the idle speed.

of the idle speed sensor is complete.

Replacing the idle speed sensor

IAC cleaning

It is recommended to wash and clean any non-working idle speed sensor on the VAZ 2110 to make sure it is faulty. The process is very simple and will not take much time. To do the job you need: carburetor cleaner, WD-40. The following actions are performed:

1. The block is removed from the sensor;
2. Apply any of the listed cleaning liquids to a regular cotton swab and carefully treat the contacts;
3. Unscrew the screws securing the idle speed sensor;
4. Remove the IAC from the seat;
5. Inspect the idle speed sensor. If black dirt, oil, or IAC are detected, it is necessary to clean the entire throttle assembly. If not, spray WD-40 or cleaner onto the needle with a spring, thereby cleaning it. Dry the idle speed sensor VAZ 2110, 2112;
6. Before reinstalling, measure the distance between the idle speed sensor housing and its needle, which on a working regulator is 23 mm.

When the IAC VAZ of the tenth family did not work normally, the guide needles wore out and the wire inside the housing broke. In these cases, the idle air regulator must be replaced.

On a VAZ 2110, the idle speed sensor is mounted in the reverse order of dismantling.

Equipment diagnostics

1. We switch the tester to resistance testing mode (ohmmeter), measure the resistance at the regulator terminals according to the diagram: A - B, C - D. Data in the range from 0.040 to 0.080 Ohm.

1. Using a caliper, measure the distance between the end of the needle and the flange; it should not exceed 23 mm.

Measuring the distance

1. We inspect the mounting socket for each of the sensors, clean it with a rag from dirt and dust.
2. Before installation, lubricate the O-ring with engine oil.
3. We tighten the screws of the regulators with a torque of 3 - 4 Nm.

Checking and replacing the idle air regulator Lada Granta

Tools:

• Medium Phillips screwdriver
• Tester
• Calipers
• Knife (or scraper)
• Torque wrench

Parts and consumables:

• Idle speed control
• Engine oil
• Regulator O-ring

Notes:

When the engine is idling, the controller controls the air supply using the idle air control (PXX).

The regulator consists of a two-pole stepper motor and a cone valve connected to it. Based on a signal from the electronic engine control unit, the electric motor moves the valve, thereby changing the flow area of ​​the air channel.

The idle air control is non-separable and must be replaced if it fails.

1. Release the wiring harness block clamp.

2. Disconnect the block from the idle air control valve.

Addresses of companies providing installation/replacement services (Moscow, St. Petersburg, Kyiv region)

List of online stores providing goods (Moscow, St. Petersburg, Kyiv region)

Review of prices from different manufacturers

*prices are current as of November 3, 2018.

Symptoms of a problem

The IAC on Grant is called a sensor or IAC. But it is not one, because it does not provide information about calculating air pressure or speed. This part is a regulator. For this reason, the ECU does not receive a fault signal and does not send a “CHECK” signal to the instrument panel. The malfunction can be identified by the following signs:

1. The engine starts with difficulty.
2. It stalls after starting.
3. Speed ​​is unstable, especially in cold weather.
4. Poor speed maintenance in neutral gear.
5. High idle speed.
6. Unstable engine operation when shifting the gearbox to speed.

All of these symptoms may be the result of a malfunction of other sensors and regulators that are part of the throttle body and fuel system. The main reason for this engine behavior is a lean fuel mixture or excessive air consumption in the system. The ECU clearly regulates the amount of air and gasoline, mixing them. Any discrepancy directly affects the stability of the engine.

Important! Checking the throttle assembly for operability must begin with the idle speed regulator.

There are several ways to check the IAC for performance. This will require dismantling the part. Without dismantling, you can only check the resistance and electrical conductivity of the IAC.

Important! It is prohibited to knock on the regulator body. This method will not improve performance. But it can render the part unusable if other components of the throttle system malfunction.

Recommendations for choosing components

Insufficient driver experience and a wide range of spare parts are the main factors that make it difficult to select and purchase components for the Lada Granta.

Cheapness is the first sign of low quality workmanship.

When purchasing, carefully check the catalog items and search indexes with the actual data specified in the operating instructions. If you do not have experience in servicing equipment, use the services of certified service stations and demand a quality guarantee for the work performed.

Reviews

We determine the malfunction ourselves

The regulator is designed to maintain idle speed in a given range and ensure correct and timely warming up of the engine.

Although malfunctions in the functioning of the engine in this mode rarely occur on the Lada Kalina, practice has made it possible to establish a certain set of signs indicating a malfunction of the regulator.

• difficulties starting the unit;
• when the gearbox is in the neutral position, “floating” engine speeds are observed;
• when switching transmission stages on the move, the engine stops without authorization;
• Once the unit begins to warm up at low outside temperatures, the speed is not able to overcome the 1500 per minute mark, which “delays” the time it takes to reach operating temperature.

Observant owners of Lada Kalina testify to a decrease in speed after turning on the air conditioning compressor. This often leads to the engine stopping, and the lubricant pressure symbol in the unit lights up on the instrument panel.

The most common breakdown is instability of speed. For mileages exceeding the 50,000 mile mark, and if such symptoms appear, we first recommend cleaning the cavity of the throttle assembly. Only after this can the regulator be replaced. This device cannot be repaired, so this action becomes a non-alternative measure.

This element is not very expensive, but at the same time it is not cheap. Its price depends primarily on the manufacturer. And especially, the price tags began to differ due to the growth of the dollar exchange rate.

1. KZTA 573 rub.
2. Omega 639 rub.
3. AvtoVAZ 695 rub.
4. GM 1074 rub.

There are several other manufacturers, but there is no point in listing them, since the average price range is, in principle, understandable. If you have any questions about replacing, removing or installing the IAC on a Priora, please discuss it below in the comments.

Conclusion

The performance of idle speed sensors is influenced by many factors, including:

• fuel quality;
• level of dust and gas contamination of the territory;
• filter replacement frequency;
• car driving style.

In most cases, breakdowns are caused by violation of the operating conditions of the technical equipment by the driver. Purchasing cheap, non-original spare parts and unprofessional installation are the main factors that create the preconditions for premature wear of parts.