The drive of Audi 80/90 cars is carried out by in-line water-cooled engines located in the engine compartment along the car.
Depending on the engine, the car is equipped with a carburetor or an electronic fuel injection system and therefore a corresponding ignition system. This information can be found in the table below. According to the vehicle identification number stamped on the left side of the engine block (arrow) and table data can identify your vehicle.
The figure shows a 4-cylinder carburetor engine.
For new models, the engine designation may consist of one number and one letter, for older models - from 2 letters.
Attention! The material presented in this manual is primarily focused on the operation of the car in the CIS countries.
The description of the repair is made in a simple, understandable form for every person. If you follow the text and drawings step by step during the repair, then there should not be any difficulties.
Simple tricks like. For example, "open the engine hood" when working in the engine compartment or "unscrew the pump nut" when working with the brake system, the wheels are not always mentioned. At the same time, difficult works are described in detail and in all details.
The following chapter contains the repair characteristics of vehicles, which are an important and integral part of this Manual.
Caution: These must be followed for any type of repair work.
Attention: Repair parameters should be read exactly about the desired model in order to avoid possible errors.
For ease of use, electrical circuits are presented in the relevant sections of the proposed material.
In a passenger car to supply all consumers (headlights, radios, etc.) up to 1000 m of wires were laid.
If you need to fix a malfunction or if you want to install additional equipment, you can not do without an electrical circuit; it shows current circuits and wire connections. The current loop must be closed, otherwise no current will flow through it. For example, it is not enough to connect voltage to the headlight without connecting its circuit to ground.
Therefore, the ground wire connects the battery to the body. Sometimes this connection to the ground is not enough and the mass is supplied to the consumer by a separate, usually in brown insulation, wire. Switches, fuses, measuring instruments, electric motors and other electrical elements are switched on in individual currents of the circuit. For correct connection, their contacts are marked accordingly.
To organize the wires in the diagram, the individual current circuits are placed next to each other and numbered.
Vertical lines approach the field, most often highlighted in gray. This field displays the relay board with holders and through them it is connected to the positive power supply of the current circuit. In any case, the relay board also has an internal ground wire (terminal 31). The thin lines in this field represent the internal connections of the individual current paths on the relay board. At the bottom, each current circuit is connected to a horizontal line, which is a connection to ground. The ground connection is usually made through the body or by a separate wire from the ground connection point located on the body.
If the current circuit is interrupted by a square. inside which a number is indicated, then this number indicates the current circuit in which this current circuit continues.
It is most reasonable to use electrical circuits as follows:
First you need to find the desired element in the list of symbols, for example, the heater fan switch. In the right column, next to the name of the element, the number of the current circuit is indicated, which is also shown in the diagram on the lower horizontal line.
To be able to read an electrical circuit, you need the meaning of the designations of some elements, in addition, you should know the most important switching designations.
Designations of the most important elements:
Designation | Element |
A | Battery |
IN | Starter |
WITH | Alternator |
D | Egnition lock |
E | Manual switch |
F | Mechanical switch |
G | Sensor, control device |
H | Beep, beep |
double tone, fanfare | |
J | Relay, control unit |
K, L, M, W, X | Control lamps. lamps, illuminators |
N | Solenoid valves, resistors, switching units |
ABOUT | Distributor |
P, Q | Spark plug connector, spark plugs |
ignition | |
R | Radio |
S | Circuit breakers |
T | Plug connections |
V | Electric motors |
To accurately determine the letter of the symbol, the serial number of the element is put.
Relays and electronic control units are depicted as a rule on a gray background. The lines shown there are internal connections. They are showing. how switching occurs within a relay or electronic or electrical components, or how they are interconnected on a relay board.
The number in the black box indicates the relay on the relay board with fuse holders. Directly next to the relay shown is the contact designation.
Example: If the contact on the diagram is marked 17/87. this means that 17 is the terminal number on the relay board and 87 is the terminal designation on the relay or on the control unit.
The terminals in the diagrams are labeled according to DIN standards. The most important terminals are marked as follows:
Terminal 30. Battery voltage is constantly applied to this terminal. The wire is always red or red with colored stripes.
Terminal 31 connected to mass. Ground wires are usually brown.
Terminal 15 powered through the ignition switch. Voltage is present when the ignition is on. The wires are most often green or green with colored stripes.
Terminal X is also energized when the ignition is on, but the voltage is removed when the starter is turned on. This ensures that all battery power is supplied to the ignition system when the engine is started. All more or less powerful consumers are powered from this terminal. High beam is also switched on from this terminal. Thus, when the ignition is switched off, the main beam switched on automatically switches to the sidelights. In the electrical diagram, individual wires are indicated by numbers and letter combinations below the numbers.
Example: 1.5 ws/ge
The numbers indicate the cross section of the wire. The letters indicate the color of the wire. If the designation has two groups of letters separated by a fraction, as in the example above, the first group of letters means the main color of the wire: \lg5=white, and the second additional color: de=yellow. If it happens that wires with the same color are used in different current circuits, it is recommended to check the color combinations at the corresponding connection point. White wires for distinguishing have a number, which is indicated on the diagram under the color designation.
Symbols for wire colors:
- bl = blue
- br = brown
- ge = yellow
- gn = green
- gr = gray
- rt = red
- sw = black
- li = lilac
- ws = white
Wires connected by single or multi-pin connectors have, in addition to the connector designation, "T" digital combination. Example: T2p = 2-pin connector, T32/27 = 32-pin connector with 27 pins used.
In the electrical diagrams, all consumers and switches are shown in the off state. The switching of the current circuit by a switch is shown here using the example of a two-position switch.
When switch E23 is turned to the first position, current will flow from terminal 83 through terminal 83a. The second voltage of the switch is not connected in this position. Only when the switch is switched to the second position, the current will flow from terminal 83 through terminal 83b. The connection between terminal 83 and terminal 83a remains intact.
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