Where is the crankshaft sensor located on the Passat B4?

If the fan on a Passat B8 or B4 is constantly spinning, it means the engine is starting to overheat. The thermostat may be to blame.

Author of the article: Roman Krasinets 04/23/2020 0 0

The fan switch sensor (FSW) is an important element in the engine cooling system. If it stops responding to coolant temperature, the system will stop working properly and the engine will fail.

Checking the Hall sensor and replacing it

The Hall sensor is one of the most important elements of the contactless ignition system for gasoline engines. The slightest malfunction of this part leads to serious problems in the operation of the motor. Therefore, in order to avoid diagnostic errors, it is important to know how to check the Hall sensor and, if necessary, to be able to replace it.

We divided this material into two parts: theoretical (purpose, design and principle of operation of the Hall sensor) and practical - signs of malfunction, verification methods and replacement methods.

And before checking the Hall sensor for malfunctions, let's understand its purpose and operating principle.

What is a Hall sensor and how does it work

The Hall sensor (also known as a camshaft position sensor) is one of the main elements of the distributor. It is located next to the distributor shaft, on which a magnetically conductive plate, similar to a crown, is attached. There are as many slots in the plate as there are cylinders in the engine. There is also a permanent magnet inside the sensor.

The principle of operation of the Hall sensor is as follows: when the shaft rotates, metal blades alternately pass through a slot in the sensor. As a result, a pulse voltage is generated, which enters the ignition coil through the switch and, converted into high voltage, is supplied to the spark plugs.

The Hall sensor has three terminals:

one connects to the “mass”,
the second is approached by a plus with a voltage of about 6 V,
The converted pulse signal goes from the third terminal to the switch.

how to replace the Hall sensor with your own hands

Source: https://unit-car.com/diagnostika-i-remont/150-datchik-holla.html

Symptoms of failure

Of course, like any other element in the Volkswagen Passat B3, the Hall sensor can fail. But before you start replacing it, you should accurately determine the fault. In order to understand that this component is broken and it’s time to change it, you need to watch the car’s operation. The main signs of component failure are given below:

The Volkswagen Passat B3 had problems starting. The car may start with great difficulty or may not start at all. That is, the spark will be completely absent.
You notice that when idling, the engine behaves differently than before. In particular, the engine began to shake very much, and there were interruptions in the idle speed. In addition, floating speed can also cause a breakdown of the Hall sensor. Accordingly, a drop in speed may occur due to a lack of power.
When driving at high speeds or uphill, jerking also appeared. The loss of engine power is especially noticeable.
Incorrect motor operation. ICE can occur at absolutely any time. Also, the engine may suddenly start if you press the gas pedal while coasting.

How to Check the Hall Sensor Passat B3

12 May
how to check the Hall Sensor VW Passat B3?

Hall sensor test for Passat B3

In modern cars, the Hall sensor is one of the main components of the contactless ignition system. Therefore, special attention should be paid to the health of this part, especially if there are any problems in its operation. We invite you to find out what the Passat B3 Hall sensor is, what it is needed for and how to find if it is broken.

Concepts and functions

Symptoms of failure

The Volkswagen Passat B3 had problems starting. The car may start with great difficulty or may not start at all. That is, the spark will be completely absent.
You notice that when idling, the engine behaves differently than before. In particular, the engine began to shake very much, and there were interruptions in the idle speed. In addition, floating speed can also cause a breakdown of the Hall sensor. Accordingly, a drop in speed may occur due to a lack of power.
When driving at high speeds or uphill, jerking also appeared. The loss of engine power is especially noticeable.
Incorrect motor operation. ICE can occur at absolutely any time. Also, the engine may suddenly start if you press the gas pedal while coasting.

Checking the Hall sensor and replacing it

And before checking the Hall sensor for malfunctions, let's understand its purpose and operating principle.

What is a Hall sensor and how does it work

The Hall sensor has three terminals:

one connects to the “mass”,
the second is approached by a plus with a voltage of about 6 V,
The converted pulse signal goes from the third terminal to the switch.

how to replace the Hall sensor with your own hands

Source: https://unit-car.com/diagnostika-i-remont/150-datchik-holla.html

How to Check the Hall Sensor Passat B3

12 May

how to check Hall sensor VW Passat B3?

Hall sensor test for Passat B3

Concepts and functions

Even a minor malfunction of the Hall sensor in a Volkswagen Passat B3 can cause unpleasant consequences for the engine. Therefore, in order to prevent damage to this element, it is important to know how the testing and diagnostic procedure is performed, but first you need to understand what the Hall sensor in the Volkswagen Passat B3 is designed for and what functions it performs. ,

Volkswagen Passat B3

hall sensor , which is essentially a timing position control device, is considered one of the main components of the distributor.

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In case you didn't know, a distributor is also called a distributor. In Volkswagen Passat B3 cars it is installed next to the distributor pulley. A crown-shaped magnetic core plate is mounted on the distributor itself. It is noticeable that this plate has exactly the same number of holes as there are cylinders in the engine. In particular, a permanent magnet is installed inside the sensor.

About the mechanism of work. sensor pass through it in turn. Thus, a pulse voltage is generated, which is supplied to the ignition coil through the switch. At the coil it is turned to the maximum voltage, which in turn is then passed through the high voltage wires to the spark plugs.

The device for monitoring the position of the pulley has been disassembled

When an iron plate passes by the device, it generates a voltage pulse. This impulse is sent to the Volkswagen Passat B3 engine control unit. In addition, it already depends on how often the distribution pulley rotates, the signal from the device will enter the block at different intervals. Accordingly, when receiving signals, the control unit determines where the piston of the first cylinder is located and then provides fuel injection. The fuel/air mixture is then ignited.

By design, the Hall sensor has several terminals:

one of them is closely related to the “mass”;
the plus is connected to another terminal, the voltage of which is 6 volts;
the pulse signal is sent to the commutator on the third terminal.

Symptoms of Failure

A simple test of Hall sensors! Simple test of the Hall sensor!

When inflammation tasks begin, in systems where it is used a Hall sensor

, there is such a question.

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as a test hall sensor

My repair site, as well as links to products, check the room sensor

tester, checking
Hall sensor
.

Hall sensor diagram for Volkswagen Passat b3

Of course, like any other element of the Volkswagen Passat B3, the Hall sensor may malfunction. But before replacement, the fault must be clearly identified. To understand that this component is broken and it's time to change it, you need to look at the car. Here are the main features of component failure:

Volkswagen Passat B3 has problems starting. The car may be very difficult to start or may not start at all. That is, the spark will be completely absent.
You notice that when idling, the engine behaves differently than before. In particular, the engine began to tremble very strongly, and there were downtimes. In addition, the rotation of the swim can also be harmful to the Hall sensor. Accordingly, the slowdown may occur due to lack of nutrition.
There were also jerks when driving at high speed or uphill. The loss of engine power was especially noticeable.
The engine is faulty. ICE can happen at any time. The engine may suddenly start if you press the accelerator pedal when you hit shore.

Checking instructions

Now we will tell you how to test the Hall sensor. If you notice any signs of device failure and believe that it is causing the engine to fail, you should have it checked. Below are the verification instructions. If you want to do it right, you should do the following:

First remove the spark plug from its installation location. Then disconnect the center wire from the distributor. Then take the inside out spark plug and insert one end into the distribution wire. Otherwise, throw ground on the motor. Then turn the engine with the starter. If in this case no spark appears, then we check the hall .
Disconnect the wiring harnesses from the distributor. Then turn on the ignition, you will need to measure the voltage between the two terminals. The voltage indicator should not exceed 9 volts.
If the voltage is ok, you need to follow these steps. Turn on the ignition, and then try to close the central contact of the device microcircuit on one of the side contacts with an additional wire. When you do this, a spark should appear at the plug and you should hear a nozzle sound. soft click. If the injector clicks normally, without interruption, and there is no spark, then you have problems with the engine, but the Hall sensor itself is in working order.
Now you need to put the wire back on the distributor and diagnose the ignition coil. There is a three socket outlet on this reel and the negative wire also fits. Note: there are side slots in the minus and plus connectors and in the center there is a contact signal sensor Hall with an electronic control unit. Remove this connector from the coil itself.

Then you need to find out which of the two side contacts is “plus” and which is “minus”. The positive terminal must be powered by the battery, and the power outlet must be limited to negative. If a spark appears at the spark plug, the sensor must be replaced. If there is no spark, the ignition coil or switch will need to be repaired.

If there is no spark, power from the switch may not flow to your device. To find out if this is true, you need a voltmeter and a set of screwdrivers. First, turn off your device. Take one wire from the voltmeter and connect it to the positive terminal. At this point, the voltmeter should display numbers corresponding to the voltage indicator. 10-12 Volts. If the voltage is normal, the switch in your Volkswagen Passat B3 is fully functional. If there is no voltage, then check the electrical circuit that goes from the computer to the device itself.

The principle of wiring is no different from checking wires in everyday life. Take a voltmeter and connect one wire to one end of the circuit and the other to the other. If in this case the voltmeter does not show voltage in the circuit, it is necessary to replace the wire itself, it may be interrupted.

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