The crankshaft sensor. How do I check the crankshaft sensor?


Modern cars are equipped with a lot ofdifferent control systems. They are divided according to their functional purpose. Distinguish between the engine management system, the running gear, comfort and safety of the driver. Every motorist is interested in dynamic characteristics. If the machine does not start, the motor power falls, the operation fails, then the cause may be a starter, battery or crankshaft sensor. How to check the last element, many do not know. But the reason can be in it.

Crankshaft sensor - device and principle of operation

It must be said that this sensor isthe only one without which the car can not function properly. The crankshaft position sensor is called the synchronization mechanism. It allows the computer to synchronize the engine with the timing of the engine. The device helps to generate signals for clock, cyclic, and also angular control of the injection of the fuel mixture and the ignition system.

crankshaft sensor how to check
The principle of operation of this sensor is not so complicated,as it may seem. It lies in the creation of an inductive signal. But there are systems of other types. This is a Hall sensor and optical systems. At the moment when the teeth on the crankshaft pulley pass near the sensor core, pulses with alternating voltage are formed. In other words, this is an electromagnetic device that synchronizes the operation of the injectors, as well as the ignition system in the injection system. This is the main link, without which the work of the motor will be simply impossible. The sensor is paired with the synchronization disk. Due to this, angular impulses are formed. There are 60 teeth on the disc, which are missing 2. This contributes to the generation of pulses. The angle of one such tooth with a distance to the next is 6 degrees from the position of the crankshaft. The beginning of the 20th tooth after the cut-out place completely coincides with the top dead center for the first or fourth cylinder.
how to check the crankshaft sensor
The sensor provides a gap between the disc teeth and the end part, and the sensor is a copper wire winding on an insulated coil with a core inside.

Where is the sensor located?

This device is made in plastichousing. You can find it on a special bracket near the synchronization dick or next to the generator pulley. The car uses a large number of different sensors - the DPCV can be recognized by a long cable with a connector.

Causes of crankshaft position sensor failure

By itself, this sensor does not malfunctionwill be. The sensor either works or does not work at all. If it fails, it is an irreversible process. The reasons for the failure of this part can be several. Most often the malfunction is caused by constant loads when working in conditions of high temperatures, high humidity, mechanical influences. Many do not know how to check the serviceability of the crankshaft sensor, and attend the SRT with this problem. In fact, everything is very simple. There are affordable ways that you can use at home and at the same time completely free.

Symptoms of malfunctions

The most common type of sensor failure- this is partial or complete wear of the wiring. How do I check the crankshaft sensor? This can be done with special scanners. Today they have become more accessible. To understand that the device has failed, a burning light on the dashboard will help - "Check the engine". But this is relevant only for new cars.

How to check the crankshaft position sensor
But on older cars you have to understandto the owner. The driver in the failed DGPD will face a lack of idling - the engine will go deaf. The motor will show unstable operation at idle. Also the machine, where there are problems with this sensor, will stall when driving. And one more sign is detonation under load. If there is at least one of these signs, the crankshaft sensor is most likely broken. How to test it? There are several options. Use the services of professional diagnosticians in the SRT or perform testing yourself. There are several ways for this. The verification procedure itself does not cause complications, but there is one unpleasant moment - the sensor is very inconveniently installed, and to get to it, you need to apply special tricks.

Methods for verifying DHCP

There are three options, how to check the position transmittercrankshaft. In each case, different instruments will be used, but at the same time each device is available. The easiest way is to have an ohmmeter, but a tester or a multimeter will do. The second requires the use of several instruments. On SRT these sensors are checked by an oscilloscope.

how to check the crankshaft sensor
The first thing to do is to dismantle the sensor. It is preliminary recommended to note its provisions - then you need to set it back strictly to this place. And here the sensor of the crankshaft is removed. How to test it? Initially, visually.

Visual Diagnostics

The housing, contacts, core, terminal block must not have any damage.

how to check crankshaft sensor
When assessing the condition, you should carefully cleansedevice from dirt. This is especially true for contacts. Cleaning can be done with rags soaked in gasoline or alcohol. There is no difference in principle how to check the crankshaft sensor. "GAZelle" or any other car in this regard are similar. When dismantling, check the distance between the core and the synchronization disk - it is from 0.6 to 1.5 mm. Adjust the clearance by using the appropriate washers. If the inspection failed to identify the damage, you need to apply other methods, such as check the crankshaft sensor. These methods will prompt you more precisely whether the device works or not.

Verification of the DCIP by an ohmmeter

This is the simplest method. It is accessible to everyone. If an ohmmeter is hard to find, an ordinary multimeter will do. They check the resistance on the sensor coil. On whether the coil is working, the efficiency of the sensor depends.

how to check the crankshaft sensor
In good condition, the resistance will be equal tofrom 550 to 750 ohms. For complete confidence, before you test the crankshaft sensor, the tester should better study the manual on the machine - there the manufacturer indicates the exact parameters. If the readings are correct, then the sensor is OK. If not, then it must be replaced. This is the easiest way. But the drawback is that there is no complete guarantee of the correctness of the diagnosis. Experts recommend applying a more global test.

Diagnostics with a mega-meter

There is a suspicion that the crankshaft sensor is defective. How to test it more accurately? There is a good way. During the operation, the main parameters of the device will be measured. For diagnosis, you need a multimeter, a megaohmmeter, an inductor and a transformer. The resistance is measured in the same way as in the first case. As for the inductance, it is measured with a special device - the indicators should be from 200 to 400 MHz. It's okay if the disc gets magnetized a little. It can be demagnetized using a network transformer. Insulation resistance is checked with a megaohmmeter. Under voltage of 500 V, this parameter should not be higher than 20 MΩ. On the basis of the figures obtained, it is then possible to draw conclusions about whether a replacement of the sensor is necessary or is it correct.

How to check the serviceability of the crankshaft sensor
A more effective way, how to check the crankshaft position sensor, has not yet been invented. They have many years used by experienced motorists, testing is possible at home.


There is also one more variant of diagnostics - thischeck with oscilloscope. This method is used in SRT. The problem is that, in addition to the oscilloscope, you also need special software, which is sometimes impossible at home. Therefore, it is better to measure the key parameters of the sensor and compare them with the passport values. Even novice motorists will not have difficulties with how to check the crankshaft sensor ("Opel Astra" including) in these ways. These diagnostic methods have already shown their effectiveness more than once.

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