How to check the Hall sensor

Hall Sensor

Need check hall sensor appears when there are problems with the car's ignition system, and therefore you need to make sure that all its components are working, namely, the idle speed sensor. So let's analyze in detail the principle of operation, signs of failure and how to check the Hall sensor with your own hands.

The principle of operation of the sensor and its features

In its work, the sensor uses the physical Hall effect, also discovered in the 70th century. However, they began to use it only in the 80-XNUMXs of the last century, when automakers began to switch from contact ignition systems to electronic ones.

The principle of operation of the sensor is quite simple. When the internal combustion engine shaft rotates, the metal blades pass through the slots in its housing. It gives an electrical impulse to the switch, as a result of which the latter unlocks the transistor and supplies voltage to the ignition coil. It, in turn, converts the low-voltage signal into a high-voltage one, and feeds it to the spark plug.

Structurally, the sensor has three contacts:

• for connection to ground (car body);
• for connecting a voltage with a “+” sign and a value of about 6 V;
• to send a pulse signal from it to the commutator.

Benefits of using a Hall effect sensor in electronic ignition systems, there are two basic factors - no contact group (which constantly burns), and higher voltage across the candle ignition (30 kV versus 15 kV).

Since Hall sensors are also used in braking and anti-lock systems, tachometer operation, the device performs the following additional functions for the car:

• increases the performance of the motor;
• speeds up the functioning of all vehicle systems.

As a result, the usability of the vehicle is increased, as well as its safety.

Hall sensor for VAZ 2107

Hall sensor for VAZ 2109

Hall sensor for VAZ 2110

Signs of a broken Hall sensor

Sensor breakage manifests itself in different ways... It is sometimes difficult to identify them even for an experienced craftsman. Here are some of the most common Hall effect symptoms and problems:

• starts badly or the internal combustion engine does not start at all;
• outages in engine idling;
• "Jerking" car when driving at high speeds;
• ICE stalls while driving.

If your car has one or more of these symptoms, you should definitely check the sensor.

How to check the Hall sensor

Exist multiple verification methods... In short, they are done like this:

Hall sensor serviceability check (diagram)

• Creating a simulation of the presence of a Hall sensor... This verification method the fastest and is suitable if there is power at the nodes of the ignition system, but there is no spark. For this purpose, a three-plug block is removed from the distributor. then you need to turn on the ignition of the car, and connect (close with a piece of wire) outputs 3 and 2 (negative pin and signal contact). If in the process on the center wire of the ignition coil a spark will appear - means, the sensor is out of order... Note that in order to detect sparking, you need to hold the high-voltage wire near the ground.
• Hall sensor test with a multimeter, the most common method. With such a check, a multimeter (tester) is used. To do this, it is only enough to measure the voltage at the output of the sensor. If it is working, then the voltage should be within 0,4…11 V.
• Replacing a faulty device with a known working one... You can get it from friends who have a car with the same sensor. If, after replacement, the problems that bother you disappear, you will have to buy and replace the Hall sensor with a new one.

Hall sensor test

Hall sensor, check with a multimeter.

also one common method is to check for resistance across the sensor. To do this, you need to produce a simple device, consisting of a 1 kΩ resistor, an LED and flexible wires. A resistance is soldered to the leg of the LED, and two wires are connected to it of a length that is convenient for work (not short).

Then remove the distributor cap, disconnect the distributor and plug box. Next, check the health of the electrical circuit. To do this, an electronic multimeter (voltmeter) is connected to terminals 1 and 3, after which the car's ignition is turned on. Under normal conditions, the value obtained on the meter screen should be within 10…12 V.

further, we similarly connect the constructed device to the same terminals. If you guessed correctly with the polarity, the LED lights up. Otherwise, you need to swap the wires. The further procedure is as follows:

• do not touch the wire connected to the first terminal;
• the end from the third terminal is transferred to the free second;
• we turn the camshaft (manually or with a starter).

If the LED blinks during the rotation of the shaft, then everything is in order, and the Hall sensor does not need to be replaced.

It is worth noting that the process of checking the Hall sensor on the VAZ 2109, Audi 80, Volkswagen Passat B3 and other cars is carried out in the same way. The difference is only in the location of individual parts under the hood of the car.

Hall sensor replacement

Replacing the Hall sensor VAZ 2109

Consider the process replacing the Hall sensor on a VAZ 2109 car... This procedure is simple, and does not cause difficulties even for novice car enthusiasts. Its algorithm is as follows:

• The first step is to remove the distributor from the car.
• After that, the cover of the distributor is dismantled. next you need to combine the marks of the gas distribution mechanism and the mark of the crankshaft.
• Then the fasteners are dismantled with a wrench. In this case, do not forget to mark and remember the location of the distributor.
• If there are latches or stoppers in the housing, they must also be dismantled.
• In the next step, take out the shaft from the distributor.
• further disconnect the terminals of the Hall sensor, and also unscrew the mounting bolts.
• The sensor is removed through the gap formed.
• The installation of a new Hall effect sensor is carried out upside-down.

Hack and predictor Aviator

It is worth noting that it is not worth repairing the Hall sensor, since it is quite inexpensive (about $ 3 ... 5). If you are convinced that the breakdowns in the car are connected precisely with the mentioned sensor, we recommend that you go to the nearest auto shop and buy a new device. In case of difficulty when checking or replacing the Hall sensor, contact the craftsmen working at the service station for help.