Top dead center (TDC) and crankshaft speed sensor Lada Largus. TDC sensor and crankshaft position sensor Top dead center sensor

The engine controls the position of the crankshaft to ensure the operation of the fuel injection system. In other words, the crankshaft position sensor (timing sensor) accurately determines the moment when fuel needs to be supplied to the cylinders.

The specified crankshaft speed sensor directly affects the operation of the engine. Any malfunction of the sensor will lead to instability of the internal combustion engine or a complete stop of the engine. IN different designs the crankshaft sensor is responsible for synchronizing the operation of the fuel and synchronizes. Malfunctions of the DPKV lead to the fact that the fuel is not supplied in time and ignites in the cylinders. As a result of fuel injection malfunctions, the engine is not able to work normally.

The function of the crankshaft sensor is that the DPKV sends signals to the computer about the position of the crankshaft, as well as at what frequency and in which direction it rotates. On the different cars crankshaft position sensors that differ in principle of operation can be installed, which are divided into the following types:

• Magnetic crankshaft sensor (DPKV inductive type). A feature of such sensors is that such solutions do not need a separate power supply. The formation of a signal on the ECU occurs at the moment when a special tooth (label) for synchronization passes through a magnetic field. The specified magnetic field is created in the area of ​​the synchronization sensor, that is, around it. In parallel with the main task of controlling the position and rotation of the crankshaft, the DPKV can also serve as a speed sensor;
• Hall effect crankshaft position sensor. DPKV of the indicated type are . In such sensors, the current begins to move at the moment when a changing magnetic field approaches the sensor. A special synchronizing disk realizes the overlapping of the magnetic field, the teeth of the disk interact with magnetic field DPKV. The crankshaft speed sensor of the specified type can simultaneously perform the function of an ignition distributor sensor;
• Optical type crankshaft sensor. The optical crankshaft position sensor also interacts with the timing disc, which has special grooves (teeth). Holes can also be made on the disk. The specified disc blocks the optical flow that passes between the LED and a special receiver. The task of the receiver is to fix the interruptions in the light flux, after which a voltage pulse is created, which is transmitted to the engine control unit;

A common question is where the crankshaft sensor is installed. The crankshaft position sensor is enclosed in a housing similar to similar sensors of the engine management system (etc.). The place of its installation on the engine is a special bracket, which is located next to the drive pulley. car generator. You can also distinguish DPKV from other sensors by the presence of a sufficiently long wire (55-65 cm) with a special connector. Through the specified connector, the crankshaft sensor is connected to the internal combustion engine control system.

After removal for diagnosis or replacement, the crankshaft sensor must be installed taking into account the correct clearance.

This is the gap that forms between the sensor and the toothed pulley (timing disk). The optimal location of the crankshaft sensor is such that the gap between the core and the disk is between 0.5 and 1.5 mm. It is necessary to set the desired clearance by manipulating the gaskets (washers), which are located in the area of ​​\u200b\u200bthe seat of the crankshaft sensor and the DPKV itself.

Based on the readings of the DPKV, the ECU is able to determine the position of the crankshaft in relation to the TDC in 1, as well as in the 4th cylinder of the power unit. Also, the control unit receives signals about the frequency of rotation of the crankshaft and the direction in which the crankshaft performs the specified rotation. Based on the data received, the ECU generates control signals for the injection nozzles, controls the ignition timing, transmits signals about the crankshaft speed to the tachometer, activates and disables.

Now let's look at how to check the crankshaft sensor with your own hands in case of a malfunction. To begin with, malfunctions of the crankshaft sensor are not common. When checking the timing sensor, you should also pay attention to the condition of the generator drive pulley. In the event of malfunctions in the operation of these elements, the engine may not start or stall after starting, the car does not pick up speed and twitches, the engine stalls on the go, etc. On the dashboard usually "check" lights up. Connecting the scanner to the diagnostic connector (block) will allow you to more accurately determine the breakdown by the error code, which is recorded in the computer's memory.

You can check the crankshaft sensor yourself with a tester-multimeter. It is necessary to transfer the device to the ohmmeter mode, and then measure the resistance of the crankshaft sensor winding. The resulting indicator for a serviceable DPKV should be around 800-900 ohms. In parallel with this, it is necessary to analyze the integrity of the wiring and exclude or establish the presence of mechanical damage to the sensor.

Please note that the DPKV will not work if there are any objects in the gap between the synchronization disk and the crankshaft position sensor that accidentally got there during the repair work.

It should also be added that in the case exact definition malfunction of the crankshaft position sensor, it would be more rational to buy a new synchronization sensor without trying to repair the existing part. The retail price of DPKV for most cars remains quite acceptable, and a new high-quality crankshaft position sensor is guaranteed to ensure proper operation of the internal combustion engine.

Read also

The main signs by which you can determine problems with the DPKV crankshaft position sensor yourself. Causes of failures, breakdowns, self-checking.

The modern miracle of engineering thought - a car, is very difficult to imagine without an abundance of electronic systems. Electronic systems according to their functionality can be divided into the following control systems: engine, chassis and transmission and interior (safety and comfort). That's it about one of these systems, which controls the operation of the fuel injection system, in fact, the movement of the car. This is the crankshaft position sensor.

What is a crankshaft sensor

The crankshaft sensor in different sources (books, instructions, descriptions or catalogs) can have several equal names. DPKV - crankshaft position sensor, synchronization sensor. A little less common is the name "TDC sensor".

The crankshaft speed sensor, without reservation, can be called the only sensor whose malfunction leads to engine shutdown.

Why is that? The fact is that the crankshaft sensor, whose task is to synchronize the operation of the fuel injectors or. That is, a failure in its operation leads to a failure, respectively, of the fuel injection system.

During operation, the crankshaft sensor sends signals (informs) to the ECU about the position of the crankshaft, the frequency and direction of rotation of the crankshaft. The principle of operation of the crankshaft sensor may differ depending on the type of sensor used on a particular car model.

Types of crankshaft speed sensor

• Magnetic (inductive type). Crankshaft sensors of this type do not require a separate power source. For the ECU signal, a voltage is induced when the timing tooth passes through the magnetic field formed around the sensor. In addition to monitoring crankshaft speed, the crankshaft sensor is also used as a speed sensor.
  
• Hall sensor (based on the Hall effect). The movement of current begins at the moment of approaching the sensor of a changing magnetic field. The timing disk overlaps the magnetic field, and its teeth interact with the magnetic field of the sensor. This type of crankshaft speed sensor is also used as an ignition distributor sensor.
• optical sensor. In sensors of this type, the synchronization disk is made with grooves (teeth) or holes. The disk interrupts the light flow between the receiver and the LED. The receiver, processing the received light flux into a voltage pulse, transmits it to the computer.
  

The electronic control unit (ECU), receiving the signals that the crankshaft speed sensor generates, determines: the position of the crankshaft relative to the top dead center (TDC) at 1 and 4 I, the crankshaft speed and the direction of its rotation.

Thanks to the results obtained, the ECU creates signals for controlling: injectors, ignition timing, turning on (off) the electric fuel pump, tachometer operation (readings).

Where is the crankshaft sensor

The timing sensor has the same housing as other sensors, such as the camshaft sensor. And what distinguishes it from other sensors is a long wire with a connector with which it is connected to the on-board circuit.

The location of the crankshaft sensor is very inconvenient in location, which is why a long (up to 70 cm) wire with a connector is connected to it. The sensor is mounted on a bracket near the generator drive pulley.

When installing the crankshaft sensor, the gap between the sensor itself and the toothed pulley is set. The position of the sensor is considered correct when the gap between its core and the synchronization disk is 0.5-1.5 mm. the gap distance is adjusted using washers (spacers) between the sensor seat and the sensor itself.

During operation, malfunctions of the crankshaft speed sensor may be observed, although this is a rather rare occurrence. In the event of a sensor malfunction, the alternator drive pulley, the “CHECK ENGINE” signal lights up. Either code 35 or 19 may appear in the controller error buffer.

Checking the health of the crankshaft position sensor is carried out using a tester. The resistance of the sensor winding is simply measured with an ohmmeter. The resistance should be in the range of 800-900 ohms.

Mechanical damage to the sensor can occur when performing any repair work in the engine compartment, or if foreign objects get between the sensor and the pulley teeth.

In general, experienced motorists recommend always having a spare crankshaft speed sensor in the trunk. Its cost is low, and the value for the operation of the engine is simply invaluable.

Expert opinion

Ruslan Konstantinov

Automotive expert. Graduated from IzhGTU named after M.T. Kalashnikov with a degree in Operation of Transport and Technological Machines and Complexes. An experience professional repair vehicles for over 10 years.

For motorists and especially for owners of domestic cars, it is important to always carry a spare crankshaft position sensor with you, especially if you often have to travel long distances. Given the low quality of components, this is more than relevant, and the cost of the sensor is affordable for almost all car brands. Before proceeding with the replacement of the sensor, you need to make sure that it is defective. except listed ways can be carried out visual inspection. As a rule, the DPKV rarely fails. Often the cause of the malfunction is an unacceptable gap between the sensor and the teeth of the pulley or getting into this gap. foreign objects. In addition, the cause may be severe contamination of the sensor core, in which case it is enough to clean it and install it in place. And yet, when connecting the terminal block, it is important not to reverse the polarity of the contacts, otherwise the engine will not start either. Due to the wrong polarity, the DPKV will also not function.

Good luck when operating a car with a working synchronization sensor.

TFR/TDC and CYP sensors

general description

32 On these models, based on the signal from the crank angle sensor (CKR), the timing of fuel injection and ignition for each cylinder is determined. It is also capable of detecting engine speed. The TDC sensor determines the ignition timing at start (starter), and on models with fuel injection, the CYP sensor determines the position of the cylinder for serial system injection. All three sensors are built into the distributor. Diagnostics for them comes down to checking codes (codes 4, 8 and 9), and then checking the resistance in the electrical connector.

Examination

33 Check the crank angle sensor. Disconnect the electrical connector at the distributor and measure the resistance at terminals B and F. Compare the obtained values ​​with those given in the Specifications.

34 Check that there is no resistance between any terminal and ground. If the test results are incorrect, replace the distributor (see Section 5).

35 If the test results are correct, contact the Maintenance for system diagnostics.

36 To check the TDC sensor, disconnect the wiring connector on the distributor and measure the resistance at terminals C and G (see illustration 4.33). Compare the obtained values ​​with those given in the Specifications.

37 Check that there is no resistance between any terminal and ground. If the test results are incorrect, replace the distributor (see Section 5).

38 If the test results are correct, contact the technical service department to diagnose the system.

39 To check the cylinder position sensor (CYP), disconnect the wiring connector on the distributor and measure the resistance at terminals D and H (see illustration 4.33). Compare the obtained values ​​with those given in the Specifications.

40 Check that there is no resistance between any terminal and ground. If the test results are incorrect, replace the distributor (see Section 5).

41 If the test results are correct, contact the technical service department to diagnose the system.

Check and replacement of gauges of a control system of the engine

Top sensor dead center and crankshaft speed , consisting of a magnet and a winding, is mounted on top of the clutch housing.

If a malfunction occurs in the sensor circuit, the engine stops working, the controller stores the malfunction code in memory and turns on signal lamp in the instrument cluster. In this case, check the sensor and ring gear for missing teeth, runout or other damage.

You will need: a key "for 10", a tester.

2. Disconnect the sensor harness connector.

3. Turn out two bolts of fastening of the gauge...

4. ... and remove the sensor.

5. Install the sensor top dead point and speed of rotation of the crankshaft in the reverse order of removal.

NOTE

In order to verify the correct operation of the fuel injection system after replacing the top dead center sensor and crankshaft speed

shaft or flywheel, it is necessary using special device perform a check that includes the following:

Vehicle deceleration with fuel cut by 2, 3, 4 or 5- th gear at an engine speed of 3500-3000 min -1 for at least 2 s;

Repeated deceleration with fuel cut by 2, 3, 4 or 5- th gear at an engine speed of 2400-2000 min -1 for at least 3 s;

Checking for fault codes and, if necessary, troubleshooting;

Erasing codes.

coolant temperature sensor installed at the end of the cylinder head on side 1- th cylinder. The sensor is an NTC thermistor: the electrical resistance of the sensor decreases with increasing temperature. The ECU processes the sensor signal and sets the optimal enrichment of the working mixture when the engine warms up.

You will need: 21 wrench, flat blade screwdriver, tester, thermometer.

2. Drain the coolant (see "Changing the coolant").

3. Press the lock with a screwdriver ...

4. ... and disconnect the wiring harness connector from the coolant temperature sensor.

5. Loosen the sensor tightening with a wrench and unscrew it by hand.

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

7.Fill in coolant.

Throttle position sensor is a potentiometer that is mounted on the throttle shaft. The rotation of the damper axis causes a change in the voltage of the sensor signal, by which the ECU determines the degree of throttle opening.

If the engine is idling or acceleration dynamics deteriorate, check the sensor and its connector.

You will need: TORX T20 key, tester.

1. Disconnect the wire from the negative terminal of the battery.

3. Wring out a clamp and disconnect a block of a plait of wires from the gauge.

4. Connect the tester in resistance measurement mode to terminals "B" and "C" of the sensor.

5.Measure the resistance at the sensor terminals with the throttle fully closed. It should be 2.3-2.4 kOhm.

6. Turn the throttle by hand until it is fully open and measure the resistance again. It should be 1.3-1.4 kOhm.

7. To replace the sensor, unscrew the two bolts of its fastening (for clarity, it is shown on the removed throttle assembly) ...

8. ... and remove the throttle position sensor.

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

Absolute pressure (vacuum) sensor in the intake pipe installed on the intake pipe. The sensor detects the change in pressure (vacuum) in the intake pipe depending on the change in load and engine speed and converts them into an output signal voltage. Depending on the sensor signal, the ECU calculates the amount of air entering the engine.

1. Disconnect a wire from the minus plug of the storage battery.

2.Press out the latch...

3....and disconnect the wiring harness connector from the sensor.

4. Carefully remove the absolute pressure sensor, overcoming the resistance of the sealing rubber rings (the sensor fitting is installed with an interference fit in the intake pipe opening).

5.Install the sensor in the reverse order of removal.

Intake pipe air temperature sensor installed on the intake pipe next to the throttle assembly. The sensor is an NTC thermistor: the electrical resistance of the sensor decreases with increasing temperature. Based on the air temperature information from the sensor, the electronic control unit regulates the amount of fuel injected.

You will need a flat blade screwdriver.

1. Disconnect the wire from the negative terminal of the battery.

2. Remove the air filter (see "Removing and installing the air filter").

3. Disconnect the wiring harness block from the sensor by squeezing the spring clip with your fingers.

4.Pry off with a screwdriver...

5....and remove the sensor.

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

Knock sensor , attached to the cylinder block between 2- m and 3 - m cylinders, detects abnormal vibrations (detonation shock) in the engine.

It is more convenient to carry out the work of replacing the sensor on a car mounted on a lift, since access to the sensor from above is very difficult.

You will need a key "for 24".

1. Disconnect the wire from the negative terminal of the battery.

2. Squeeze the latch and disconnect the wiring harness block from the sensor.

3. Turn out the knock sensor ...

4....and remove it.

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

Oxygen concentration sensor (lambda - probe) installed on exhaust manifold. On some vehicles, a second sensor is installed behind the catalytic converter. The sensor measures the oxygen content in the exhaust gases and converts the measured value into a signal voltage that is supplied to the electronic engine control unit. Using the sensor signals, the ECU controls the fuel injection in such a way as to obtain the calculated composition of the air-fuel mixture.

If the oxygen concentration sensor is defective, the toxicity of the exhaust gases may increase dramatically.

You will need: keys "for 10", "for 22".

1. Disconnect the wire from the negative terminal of the battery.

2. Press the latch...

3 .... and disconnect the wiring harness block.

4. Remove the block from the bracket by sliding it forward.

5. Turn away three nuts...

6. ... and remove the thermal screen.

7.Remove the wire from the holder.

8. Loosen...

9. ... and unscrew the sensor from the exhaust manifold.

10.Install the sensor in the reverse order of removal.

Vehicle speed sensor mounted on the gearbox and is a Hall sensor. It outputs a pulse signal proportional to the speed of the drive wheels to the electronic engine control unit.

1. To replace the speed sensor, disconnect the wire from the negative terminal of the battery.

2.Press out the latch...

3. ... and disconnect the wiring harness connector from the speed sensor.

4. Gently pry off the sensor with a screwdriver...

5. ... and remove it from the gearbox housing.

6. Install the speed sensor in the reverse order of removal.

How to replace yourselfRENault logan 09- H/ o/ 8200772182 OE - (8200772182 , 8200746453, 8200746497) by car Largus RENAULT, RENAULT Logan, Duster.

Any breakdown is not the end of the world, but a completely solvable problem. Sensors belong to measuring instruments, they convert the measured physical quantities into electrical signals and display digital data on the display.

Sensorcrankshaft position during operation gives pulse signals, informing the electronic control unit about the location of the crankshaft, about the direction and frequency of its rotation.

Removing the crankshaft position sensor (on the engine 1.6 (16V), on the engine 1.6 (8V)) for checking or replacing, as well as when dismantling the gearbox - similar. You will need a key "for 10".

Disconnect the wire from the "minus" terminal of the battery.

Remove the air path resonator.

Disconnect the engine management wiring harness connector from the coolant temperature sensor.

We unfasten the plastic holder for fastening the wiring harness of the engine control system.

Move the wiring harness away from the crankshaft position sensor.

By pressing the latch of the block of the wiring harness of the engine management system, remove the block from the crankshaft position sensor connector.

Using the “10” wrench, we unscrew the two bolts securing the sensor and the bracket for the wiring harness holder.

Remove the sensor and wiring harness bracket.

D crankshaft position sensor (top dead center sensor)RENault logan 09- H/ o/ 8200772182 OE You can purchase from us! (8200772182 , 8200746453, 8200746497)

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Install the crankshaft position sensor in reverse order. Tighten the sensor mounting bolts to the prescribed torque (8 Nm).

After replacing the TDC and crankshaft speed sensor, it must be calibrated using a special test, which includes the following:

Deceleration of the car with a fuel supply cut in II, III, IV or V gear at a speed of 3500-3000 min "not less than 2 s;
- repeated deceleration with fuel supply interruption in II, III, IV or V gear at an engine speed of 2400-2000 min for at least 3 s;
- checking for fault codes and, if necessary, troubleshooting;
- erasing codes.

Good luck on the roads.

You will succeed

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