Knock sensor 8200680689 (2 contacts) for VAZ Largus

The Lada Largus knock sensor, attached to the cylinder block between the 2nd and 3rd cylinders, detects abnormal vibrations (detonation shocks) in the engine. The sensitive element of the sensor is a piezocrystal plate. When detonation occurs, voltage pulses are generated at the sensor output, which increase with increasing intensity of detonation impacts. The ECU, based on a signal from the sensor, adjusts the ignition timing to eliminate detonation flashes of fuel.

Detonation in an engine is a self-accelerating process of transition of combustion of a fuel-air mixture into a detonation explosion without performing work, with the transition of fuel combustion energy into gas temperature and pressure. The flame front propagates at the speed of the explosion, i.e. exceeds the speed of sound propagation in a given environment, and leads to strong shock loads on the parts of the cylinder-piston and crank groups, thereby causing increased wear of these parts. The high temperature of the gases during detonation leads to burnout of the pistons and sealing surfaces on the valves.

About Lada car sensors and engine management system

Various sensors are responsible for the operation of all systems of a modern car. They take readings and transmit them to the electronic engine control unit (ECU). If the sensor malfunctions, an error is stored in the memory, and in some cases a Check Engine error appears on the instrument panel.

Conditions for the error

Before the error in question is recorded in the electronic unit, certain conditions must be met. Namely:

• The ECU must constantly operate in the normal mode to control fuel detonation processes. Most often, this mode is active by default, so no additional steps need to be taken to switch to it.
• Based on the information received from the sensor, it was found that the amplitude of the signal transmitted to the ECU is lower than the minimum calculated threshold value established by the manufacturer.
• In parallel with this, the engine has already warmed up; it operates at a speed of 2500 rotations per minute, or higher.

The presented conditions must be recorded 3 times. Only after 3 repetitions does the error appear.

The problem arises for a reason. Its appearance may be due to several reasons.

Where are the sensors located?

All modern Lada cars (Granta, Kalina, Priora, Vesta, Largus, Niva or Lada XRAY) are equipped with domestic VAZ engines. The location of the sensors on these motors is the same:

Elements of the electronic engine control system of the VAZ 11186/11189: 1* – controller; 2* – crankshaft position sensor; 3* – control oxygen concentration sensor; 4* – diagnostic block; 5* – diagnostic oxygen concentration sensor; 6 – throttle control unit; 7* – vehicle speed sensor; 8* – adsorber purge valve; 9* – gas pedal module; 10* – brake signal switch; 11* – clutch pedal position sensor; 12 – battery; 13 – mass air flow sensor; 14 – coolant temperature sensor; 15 – ignition coil; 16 – knock sensor; 17 – spark plugs; 18* – nozzles. *The item is not visible in the photo.

Location of ECM elements in the vehicle interior (for clarity, without dashboard): 1 – clutch pedal position sensor; 2 – brake signal switch; 3 – gas pedal module; 4 – controller.

Removing the knock sensor Lada Largus

It is more convenient to perform the work of replacing the sensor on a car mounted on a lift, since access to the sensor from above is difficult. You will need: 10mm socket, TORKHTZO, 24mm wrenches.

Operations to remove the knock sensor Lada Largus

1. Disconnect the wire from the negative terminal of the battery. 2. Remove the central engine splash guard.

2. Disconnect the wiring harness connector from the sensor by squeezing the spring clip. 3. Squeeze the latch and disconnect the wiring harness block from the sensor.

4. Unscrew the knock sensor. 5. . and remove it.

6. Install the parts in the reverse order of removal.

Coolant temperature sensor (DTOZH)

Designed to measure coolant temperature in the engine cooling system. Based on the indicators, the ECU adjusts the crankshaft speed, the composition of the fuel-air mixture and the ignition timing. The sensor practically does not break, but sometimes it lies. Quite often the wires at the base of the connector fray so much that there is nothing to even solder to. The coolant temperature sensor is installed in the thermostat cover.

See Replacing and checking DTOZH.

Knock sensor (DS)

Designed to determine the moment of occurrence of high-frequency vibrations of the cylinder block that occur during detonation combustion of fuel. Based on the sensor signal, the electronic engine control unit selects the optimal ignition timing, which allows for the most complete and efficient combustion of the fuel-air mixture in the engine cylinders, as well as automatically adjusting the ignition timing for fuels with different octane numbers. The knock sensor is located on the front wall of the cylinder block between the 2nd and 3rd cylinders.

See “Replacing and Inspecting the Knock Sensor.”

Removing the knock sensor Lada Largus

It is more convenient to perform the work of replacing the sensor on a car mounted on a lift, since access to the sensor from above is difficult. You will need: 10mm socket, TORKHTZO, 24mm wrenches.

Operations to remove the knock sensor Lada Largus

1. Disconnect the wire from the negative terminal of the battery. 2. Remove the central engine splash guard.

2. Disconnect the wiring harness connector from the sensor by squeezing the spring clip. 3. Squeeze the latch and disconnect the wiring harness block from the sensor.

6. Install the parts in the reverse order of removal.

Crankshaft position sensor (CPS)

The sensor provides the control unit with information about the speed and angular position of the crankshaft. Based on the sensor signals, the ECU calculates the phase and duration of the control pulses for the injectors and ignition coil. If it malfunctions (no signal), the engine will not start. It is located in the tide hole of the oil pump cover.

See Replacing and checking DPKV.

Knock sensor 8200680689 (2 contacts) for VAZ Largus

Dear customers, in order to avoid errors when sending knock sensor 8200680689 / 7700866055 to Lada Largus / LADA Largus / VAZ 4601, in the “Comment” line indicate your car model, year of manufacture, engine size, number of valves.

The LADA Largus engine is equipped with a distributed fuel injection system (a separate injector for each cylinder) with electronic control. The operating principles of the 1.6 (16V) and 1.6 (8V) engine control systems are almost the same. The main differences are the use of different ignition coils and different locations of individual system elements.

The engine control system consists of an electronic engine control unit (ECU), sensors for engine and vehicle operating parameters, as well as actuators.

The ECU is the central unit of the engine control system. The unit is mounted on the rear wall of the battery platform. The ECU is a special-purpose mini-computer that consists of a random access memory device (RAM) and a programmable read-only memory device (PROM).

RAM is used for temporary storage of current information about engine operation (measured parameters) and calculated data. Codes of any faults that occur are also recorded in RAM. This memory is volatile, i.e. When the electrical power is interrupted (the battery is disconnected or the wiring harness is disconnected from the ECU), its contents are erased.

The PROM stores the engine control program, which contains a sequence of operating commands (algorithms) and calibration data (settings). The PROM determines the most important parameters of engine operation: the nature of the change in torque and power, fuel consumption, ignition timing, exhaust gas composition, etc. PROM is non-volatile, i.e. its contents do not change when the power is turned off.

The knock sensor (DD) 8200680689 / 7700866055 of the 1.6 (16V) engine is screwed into a threaded hole on the front wall of the cylinder block, located in the area between the 2nd and 3rd cylinders.

Scheme of the electronic engine control system LADA Largus / Lada Largus 1.6 (16V):

1 – battery; 2 – ignition switch; 3 – main relay; 4 – diagnostic oxygen concentration sensor; 5 – switching block; 6 – idle speed regulator; 7 – instrument cluster; 8 – air conditioner switching relay; 9 – control unit for heating, ventilation and air conditioning; 10 – refrigerant pressure sensor; 11 – power steering pressure sensor; 12 – absolute air pressure sensor; 13 – ignition coils; 14 – intake air temperature sensor; 15 – nozzles; 16 – air conditioning compressor; 17 – knock sensor (8200680689 / 7700866055); 18 – control oxygen concentration sensor; 19 – throttle position sensor; 20 – crankshaft position sensor; 21 – coolant temperature sensor; 22 – vehicle speed sensor (on a vehicle without ABS); 23 – high speed cooling fan relay; 24 – fan; 25 – low speed cooling fan relay; 26 – diagnostic connector; 27 – electronic engine control unit; 28 – power relay for the fuel pump and ignition coils; 29 – fuel module; 30 – solenoid valve for purge adsorber

The knock sensor (DD) 8200680689 / 7700866055 on the 1.6 (8V) engine is screwed into the threaded hole in the rear wall of the cylinder block, in the area of ​​the 3rd cylinder.

Scheme of the electronic engine control system LADA Largus / Lada Largus 1.6 (8V):

1 – battery; 2 – ignition switch; 3 – main relay; 4 – switching block; 5 – low speed cooling system fan relay; 6 – air conditioner switching relay; 7 – fan; 8 – high speed cooling system fan relay; 9 – control unit for heating, ventilation and air conditioning; 10 – instrument cluster; 11 – refrigerant pressure sensor; 12 – power steering fluid pressure sensor; 13 – control oxygen concentration sensor; 14 – diagnostic oxygen concentration sensor 15 – diagnostic connector (diagnostic block); 16 – electronic engine control unit; 17 – power relay for the fuel pump and ignition coil; 18 – fuel module; 19 – adsorber for the gasoline vapor recovery system; 20 – vehicle speed sensor (on a vehicle without ABS); 21 – knock sensor; 22 – absolute air pressure sensor; 23 – idle speed regulator; 24 – intake air temperature sensor; 25 – throttle position sensor; 26 – nozzle; 27 – crankshaft position sensor; 28 – ignition coil; 29 – coolant temperature sensor; 30 – spark plug; 31 – air conditioning compressor

The piezoceramic sensing element of the sensor 8200680689 / 7700866055 generates an AC voltage signal, the amplitude and frequency of which correspond to the engine vibration parameters. When detonation occurs, the amplitude of vibrations of a certain frequency increases. At the same time, to dampen detonation, the ECU adjusts the ignition timing.

When the ignition is turned on, the ECU activates the control system: it turns on the fuel pump to create the required pressure in the fuel rail and processes the signals from the coolant temperature and throttle position sensors to calculate the composition of the air-fuel mixture when starting the engine. If during this time the starter does not start cranking the crankshaft, the ECU turns off the fuel pump after 2 minutes and turns it on again after cranking starts.

When the engine is running, the ECU processes sensor information: crankshaft position, throttle position, coolant temperature, absolute air pressure, intake air temperature, vehicle speed (on a car without ABS), wheel speed (on a car with ABS), oxygen concentration . Depending on the engine operating mode, the ECU controls the operation of the injectors, ignition coils, idle air control, canister purge valve, and engine cooling system fan.

When the air conditioning is turned on, the ECU increases the engine idle speed and sends a signal to engage the air conditioning compressor clutch.

The ECU calculates the ignition timing depending on the engine speed, engine load and coolant temperature.

The composition of the mixture is regulated by the duration of the control pulse supplied to the injectors - the longer the pulse, the greater the fuel supply, and vice versa.

Under normal engine operating conditions, fuel is injected alternately into each cylinder at the start of the intake stroke. To do this, the ECU uses information from the crankshaft position sensor, which determines the TDC of the pistons of the 1st and 4th, as well as the 2nd and 3rd cylinders. The system does not have a camshaft position sensor (phase sensor). Therefore, to determine which of the two cylinders needs to be injected, the ECU uses the following algorithm. Each time the engine is stopped, the last activated injector is recorded in the ECU memory, and when the engine is restarted, the command is first sent to this injector. If fuel is injected into the cylinder at a time other than the start of the intake stroke, the ECU starts a test program and determines the correct order of fuel injection into the cylinders.

If there is no signal from the crankshaft position sensor (the shaft does not rotate or the sensor and its circuits are faulty), the ECU turns off the fuel supply to the cylinders. The fuel supply is also switched off when the ignition is turned off, which prevents self-ignition of the mixture in the engine cylinders.

During engine braking (with the gear and clutch engaged), when the throttle valve is fully closed and the engine speed is high, fuel is not injected to reduce exhaust gas emissions. When the voltage drops in the vehicle's on-board network, the ECU increases the time of energy accumulation in the ignition coils (to reliably ignite the combustible mixture) and the duration of the injection pulse (to compensate for the increase in the injector opening time). As the voltage in the on-board network increases, the time of energy accumulation in the ignition coils and the duration of the pulse supplied to the injectors decrease.

The ECU controls the activation of the electric cooling fan (via a relay) depending on the engine temperature, engine speed and air conditioning operation (if installed).

The electric fan of the cooling system turns on if the coolant temperature exceeds the permissible value.

The ECU receives information from control system sensors, the air conditioner refrigerant pressure switch and pressure sensor, the power steering pressure sensor, and also controls actuators such as the fuel pump, injectors, ignition coils (coil-engine 1.6 (8V)), idle speed control , canister purge solenoid valve, cooling system electric fan, engine overheat indicator, air conditioning compressor electromagnetic clutch, and various system relays. When the ignition is turned on, the ECU issues a control signal to the main relay, and when the ignition is turned off, it delays turning off the main relay for the time necessary to prepare for the next turn on (to complete calculations, set the idle speed control, control the electric fan of the cooling system).

The ECU also performs diagnostic functions for the engine management system (on-board diagnostic system). The ECU detects the presence of control and stores fault codes in its memory. If a malfunction is detected, in order to avoid negative consequences (piston burnout due to detonation, damage to the catalytic converter in the event of misfire of the air-fuel mixture, exceeding the limit values ​​for exhaust gas toxicity, etc.), the computer turns on the malfunction indicator in the instrument cluster and switches the system to emergency operating modes. Their essence is that if any sensor or its circuit fails, the ECU uses replacement data stored in the EPROM to control the engine.

The engine management system malfunction indicator is located in the instrument cluster. If the system is working properly, then when the ignition is turned on, the indicator lights up and then goes out - thus, the ECU checks the serviceability of the on-board diagnostic system. Turning on the warning light while the engine is running informs that the on-board diagnostic system has detected a malfunction, and the vehicle continues to move in emergency mode. It is prohibited to operate a vehicle with a constantly lit or flashing warning light in the instrument cluster. It is allowed to drive the car independently (in this case, some engine operating parameters may deteriorate - power, throttle response, efficiency) to a service station to eliminate the malfunction. If the malfunction is temporary, the ECU will turn off the warning light after 10 s, provided that there are no other fault codes in the unit’s memory that require turning on the warning light.

Fault codes remain in the computer's memory and can be read using a diagnostic tool connected to the diagnostic connector (diagnostic block) located in the glove box.

When servicing and repairing the engine control system, always turn off the ignition (in some cases it is necessary to disconnect the wire terminal from the negative terminal of the battery). When carrying out welding work on a vehicle, disconnect the engine control system wiring harnesses from the ECU. Before drying the car in a drying chamber (after painting), remove the ECU. With the engine running, do not disconnect or adjust the engine management system wiring harness connectors or the battery terminal wire terminals. Do not start the engine if the terminals of the wires on the battery terminals and the tips of the “mass” wires on the engine are loose or dirty. The ECU contains electronic components that can be damaged by static electricity, so do not touch its terminals with your hands.

Other article numbers of the product and its analogues in catalogues: 8200680689, 7700866055.

Lada Largus / LADA Largus / VAZ 4601, DACIA DUSTER, DACIA LOGAN EXPRESS, DACIA LOGAN, DACIA LOGAN MCV, DACIA SANDERO, DACIA SANDERO 2.

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How to independently replace the knock sensor in a Lada Largus 16 valve car.

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Camshaft position sensor (phase sensor)

Designed to generate a signal by which the ECU determines the top dead center of the piston of the first cylinder during the compression stroke. The operating principle of the sensor is based on the Hall effect. If the sensor is faulty, the ECU switches the system to backup mode. The engine may run erratically, stall, or have difficulty starting. DPRV cannot be repaired. If it malfunctions, it is replaced with a new one.

See “Replacing and checking the phase sensor (PPRV) on LADA”.

Engine detonation: main symptoms

So, detonation is an uncontrolled chaotic process of fuel combustion, which is more like explosions in a cylinder. Moreover, these conditional explosions occur untimely (for example, on the compression stroke, when the piston is still moving upward). As a result, the shock wave and high pressure cause severe loads on the elements of the CPG and crankshaft, literally destroying the engine.

Detonation is determined not only by sound, but also by a number of other signs. First of all, the engine loses power when you press the gas, and the engine may also smoke a little when you sharply press the accelerator pedal with grayish-black smoke. Typically, severe detonation is accompanied by engine overheating; at idle and under load, the operation of the internal combustion engine can be extremely unstable, the speed jumps, etc.

Oxygen sensor (OS) or lambda probe

The oxygen concentration sensor allows you to estimate the amount of remaining unburned fuel or oxygen in the exhaust gases. The signal is used by the control unit to maintain the optimal ratio of air to gasoline in the combustion chamber. Installed in the catalytic collector before the exhaust gas catalytic converter.

Refer to Oxygen Sensor Replacement and Testing.

Bug Prone Cars

It is difficult to identify specific models that may encounter a similar problem with the knock sensor.

This is a problem typical for domestic and imported cars. Therefore, you can encounter error 0326 on the VAZ 2114, Hyundai Accent, other VAZ representatives, including 2115, models such as Kalina, Priora, etc.

It would be wrong to say that on the same VAZ 2114, error type P0326 occurs more often than on Kia Rio or Renault Logan cars.

The only thing worth adding is that this error most often occurs on vehicles that initially use low-quality sensors.

One of the causes of errors on the part of the knock sensor is refueling with fuel with a lower octane number than recommended by the manufacturer.

Therefore, it is impossible to attribute this error to some cars as chronic and often occurring. Certain conditions must simply be created for its occurrence. And it’s not always the motorist’s fault. If the car comes with a bad sensor from the factory, then there is a high risk that the engine check light will soon light up on the dashboard, and the corresponding code will be recorded in the control unit.

Mass air flow sensor (MAF)

This important sensor is located behind the engine air filter. It is also called an air flow meter. Its purpose is to estimate the amount of air entering the car engine. Based on the information received from the sensor, the electronic control unit (ECU) calculates the required amount of fuel to maintain the stoichiometric fuel-to-air ratio for the given engine operating conditions.

See “How to check the mass air flow sensor on LADA cars”

Checking the knock sensor Lada Largus

You can check the knock sensor as follows. The dismantled sensor is connected to a voltmeter (lower limit of change). In this case, you need to lightly tap the sensor, for example with the handle of a screwdriver. If the voltmeter shows a change (appearance) of voltage, then the sensor is working.

Currently, there are more and more domestic cars, as Russia has begun to pay more attention to its cars and they have become noticeably prettier and more reliable. Lada Largus is one of the popular cars of the domestic automobile industry, and this car is captivating with its dimensions, 7 seats and, of course, its economical injection engine.

The injector on Largus is equipped with many sensors that must always be in good working order and clearly perform their functions. Failure of at least one of the sensors leads to serious problems in the operation of the engine or even the inability to start it.

In this article we will talk about injector sensors on Lada Largus cars, namely their purpose, location and signs of malfunction.

Vehicle speed sensor (VS)

Serves to measure vehicle speed and transmit this information to the ECU. Its failure is directly related to a non-functioning speedometer. The vehicle speed sensor is installed on top of the clutch housing, above the right front wheel drive inner joint housing. Replacing it is very simple.

Possible reasons

Each reason discussed below could potentially be responsible for problems in the operation of a special fuel knock sensor.

There are 3 possible problems in total.

1. Malfunction, failure or breakdown of the controller itself. In this case, the fuel knock sensor transmits incorrect or incorrect information to the monitoring and control unit.
2. Problems with contacts. This may include oxidation, weakening, and violation of the strength of the connection. This happens on the contact pad itself or on the controller connector.
3. Problems in the electrical circuit. It transmits information from the sensor to the electronic control unit. The problem lies in breaks or short circuits.

It is extremely rare that the reason is due to a malfunction in the ECU.

But such a problem also cannot be ruled out. If the diagnostics described the 3 problems were not confirmed, then the only option remains, albeit the most unlikely.

Intake system channel length control valve

AvtoVAZ began installing an intake manifold with variable geometry starting with the VAZ-21127 engine. This design allows for maximum torque at low speeds and maximum power at high speeds. The length of the intake manifold is adjusted (switching from one length to another) using a valve that is part of the engine management system.

See how to replace and test the sensor.

On engine 1,(16V)

Remove the fuel rail protection (see “Removing the fuel rail protection”).

We remove the wiring harnesses from the installation location of the knock sensor.

By pressing the wire retainer of the engine management system wiring harness...

...disconnect the block from the sensor connector. Use a 24" socket wrench to unscrew...

...and remove the knock sensor.

Clutch and brake sensors

Based on the signals from the clutch pedal position sensor and the brake light switch, the controller distinguishes between pressed and unpressed pedal positions. When the clutch pedal is pressed, the controller disables engine load regulation. Both sensors are located on the pedal assembly.

See "Replacing and Inspecting the Clutch Pedal Sensor" and "Replacing and Inspecting the Brake Pedal Sensor."

Some vehicle versions use an electronic throttle valve drive (E-gas). Let us remind you that in order to understand what errors are recorded in the ECU, you need to decipher them.

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