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

Location of the idle speed sensor on the Lada Granta

The Lada Granta with an electronic pedal does not have an idle speed sensor! That's why they sent you from the store to remove yours. There is only one idle speed sensor, you can’t go wrong if you have one, of course.

This is what the electronic pedal looks like

Finding out which pedal you have is easy. If you have a throttle cable under the hood, then you have a regular pedal. So, if you do not have an electronic pedal, then the sensor is located on the throttle valve assembly, or rather in its lower part.

Throttle assembly without idle speed control (electronic gas pedal)

To remove it, you must:

1. remove power from the battery;
2. remove the power supply from the idle speed sensor;
3. unscrew the two fastening bolts;
4. remove the idle speed sensor.

In the picture the idle speed sensor is indicated in red, the throttle assembly has also been removed

We diagnose the breakdown

There can be many reasons for a situation where the engine of a Lada Granta starts and immediately stalls. And this is not necessarily the idle speed sensor.

In my experience, I can say that you can still drive an 8-valve Granta with a breakdown of this sensor, since the engine is a “tractor” one. But 16-valve engines will stall, since these are high-revving engines. Therefore, if your 8-valve valve stalls, the reason may not be a breakdown of the idle speed sensor. But if it’s a 16-valve engine, then the symptoms you described are correct. By the way, Lada Prioras behave the same way, they have the same 16-valve valve.

Replacing the idle speed control is not a panacea in the fight against floating speed or a throbbing engine. Most automotive electricians have a tester in their arsenal to check the operation of the regulator. To do this, remove yours and give it for inspection. The regulator glitch may be intermittent, but the tester will show the correct picture.

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.

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.

Replacing the sensor is not characterized by any difficulties and allows you to do it as quickly as possible, the main thing is to know where it is.

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.

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.

Absolute pressure and air temperature sensors Lada Granta

These sensors are combined into one housing and installed on the receivers of the intake module; the most modern AvtoVAZ engines are equipped with them.

DBP on Grant differs in the output signal voltage within the range of 0.15..4.6 V, this voltage depends on the pressure level inside the intake pipe. The information it sends helps the ECU calculate the amount of air received by the intake pipe during one cycle.

A breakdown of the device circuit leads to an error code being entered into the system memory, and then the alarm turns on. After this, the control system calculates the air received based on the crankshaft speed, as well as based on the throttle valve opening angle.

The sensitive component of the DTV is the inlet pipe thermistor. The output signal voltage of the device connected to the computer will be approximately 0.3..4.9 V, it depends on the temperature of the air passing through the specified element. When a DTV failure is detected, the control system performs actions similar to its actions in the event of a DBP failure on a Lada Granta, replacing the readings of the described device with fixed temperature values.

Reviews

Location of the idle speed sensor on the Lada Granta

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Lada expert An expert on Lada cars with many years of experience. I own a Lada Granta car, I collect cramps based on the Priora. Sometimes I stay overnight in the garage. My wife is more jealous of cars than of women.

The Lada Granta with an electronic pedal does not have an idle speed sensor! That's why they sent you from the store to remove yours. There is only one idle speed sensor, you can’t go wrong if you have one, of course.

This is what the electronic pedal looks like

Finding out which pedal you have is easy. If you have a throttle cable under the hood, then you have a regular pedal. So, if you do not have an electronic pedal, then the sensor is located on the throttle valve assembly, or rather in its lower part.

Throttle assembly without idle speed control (electronic gas pedal)

To remove it, you must:

1. remove power from the battery;
2. remove the power supply from the idle speed sensor;
3. unscrew the two fastening bolts;
4. remove the idle speed sensor.

In the picture the idle speed sensor is indicated in red, the throttle assembly has also been removed

We diagnose the breakdown

There can be many reasons for a situation where the engine of a Lada Granta starts and immediately stalls. And this is not necessarily the idle speed sensor.

In my experience, I can say that you can still drive an 8-valve Granta with a breakdown of this sensor, since the engine is a “tractor” one. But 16-valve engines will stall, since these are high-revving engines. Therefore, if your 8-valve valve stalls, the reason may not be a breakdown of the idle speed sensor. But if it’s a 16-valve engine, then the symptoms you described are correct. By the way, Lada Prioras behave the same way, they have the same 16-valve valve.

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.