How to run a check?
A feature of all modern models of the Volkswagen concern is the lack of a self-diagnostic function on the instrument cluster and the display of error codes on the panel. To read the existing faults on the Volkswagen cars release after 1995, the diagnostic cord and the program installed on the computer or laptop are used.
On many machines, for example, Golf 4 or Passat B5, a self-test of the systems was applied with information displayed in German or English on the instrument cluster screen. For the first time such a function was installed on the 4th generation Golf cars in 1997. No manipulation is required to read the error codes. When the engine starts, it polls all the systems and control units of the vehicle. If a malfunction is detected, information about it is displayed in text format on the screen and is complemented by a flashing or lit indicator. In this case, the signal may be yellow or red (high level of importance) color.
Messages of high importance are complemented by a triple beep, the rest - once. For example, if the oil level drops, an inscription will appear and the oiler icon will flash. If you are unable to remove the error yourself (topping up the oil, coolant or windshield fluid or filling the tank), you should carry out computer diagnostics of the car, which will allow you to accurately determine the cause of the fault.
On earlier machines (before 1995 release), errors can be read by a tester and a light bulb, which flashes the fault code in flashes.
Error reading software
The most famous and common programs are:
In addition, there are lots of highly specialized programs for reading and adjusting data in separate electronic blocks of machines. For example, in the instrument cluster or transmission control unit.
Carrying out diagnostics on the old Passat B3 is shown in the video from the author AUTO repair / NA / knee.
Location of diagnostic connectors
On Volkswagen cars of various years of release, various fuel injection systems were installed, so the type and location of the diagnostic connector can vary. The 80s Golf and Jetta cars with Bosch Mono-Jetronic fuel injection system have a single-pin diagnostic connector installed next to the ignition coil. The pin is red-white or yellow. On a similar machine system Passat, this wire has a yellow-black insulation. Since April 1989, the Passat B3 has been equipped with a two-pin connector located under the cover below the climate control unit. On later machines, the connector began to be placed at the feet of the driver or passenger sitting in front.
To read the VW error codes on machines with a single, double, or triple connector, you must:
In addition to the diagnostic methods described above, on Volkswagen cars of 1990-2000 release, it is possible to conduct a separate inspection of the microclimate system on the display of a single-zone air-conditioning unit. On more modern versions of the control panel there is no such function.
The procedure for reading errors is as follows:
How to decrypt correctly?
Below are the most common warnings that appear on the dashboard during a vehicle self-test.
On vehicles with electric power steering such as Sharan, error 00778 may occur, indicating a failure or incorrect values of the values from the steering wheel position sensor. In this case, the instrument cluster may light up a fault indicator in the power steering. A solution to the problem can be an adaptation of the sensor and checking the camber / convergence of the front wheels.
The failure of at least one sensor on the wheels causes a common error in the ABS / CAP system with code 01316. Such a problem can occur on any machine with an anti-lock system, including the Touareg.
On the most recent models, for example, on the 7th generation Golf, an error B10001B occurs due to the oxidation of wires in the plug of the airbag sensor and the increase in resistance in this contact. The problem is fixed by cleaning the contacts and covering them with a protective compound.
The most common engine problems are:
A frequent malfunction on Polo Sedan or Tiguan cars is error 00532. It usually occurs when a large electrical load is turned on while driving in urban traffic. It is expressed by a warning beep and the ABS lamp is turned on in the instrument cluster. After restarting the engine and reducing the load on the network, the problem does not arise again. This error indicates a voltage drop in the on-board network due to the discharge of the battery or damage to the wiring area. To remedy the situation, you must charge the battery and check the electrical circuit for a short circuit. The battery will have to be replaced with a strong deterioration and repeated errors due to this.
On the Golf and Caddy models with mileage, an error 00588 often occurs, which is displayed on the instrument cluster in the form of a burning lamp of an air bag system. The reason may be poor contact in the connectors connect the pillow and wiring. Occasionally the contact is broken in the control unit itself due to ingress of dirt and moisture.
For all the machines of the VAG concern, the error U111300 is characteristic, indicating the limitation of the functionality of a node due to the errors in its work. You should carefully check the wiring of such a car, because the problem lies in it.
Microclimate system problems
The most common errors are listed.
The most common mistakes of other nature:
On Volkswagen cars, errors are removed by the following method: