![](https://www.audimanual.ru/img/80/2474.jpg)
1 - ignition wire
2 - radio interference suppression plug
3 - shielding ring
4 - distributor cap
5 - a corner of the distributor cap with a spring
6 - tips of candles
7 - spark plug, 20 Nm
8 - cover
9 - terminal 4
10 - terminal 1 (-)
11 - terminal 15 (+)
12 - ignition coil
13 - ignition distributor slider
14 - connection plug
15 - ignition distributor
16 - gasket
17 - tire for VEZ, KE-Jetronic
18 - terminal
19 - fixing bolt, 25 Nm
20 - connection plug
21 - connection fitting. For vacuum lines from the throttle body. Only available for engines with designation "PS"
22 - control device - VEZ. Behind the upholstery in the footwell, front right
23 - bolt.
Attention: tightening torque is important for the operation of the knock sensor. Tightening torque for thread M6: 10 Nm; for M8: 13 Nm.
24 - knock sensor. On the engine block
25 - terminal stage
26 - engine electronics control lamp
The VEZ electronic system is a transistorized ignition system with an electronic control unit. The control device is used to generate an ignition signal in the field of a number of parameters. In the TSZ system, ignition timing is controlled by mechanical and vacuum regulators.
In an electronically controlled ignition system, the optimal ignition timing is determined depending on the current operating conditions of the vehicle. The input parameters are engine speed, engine temperature and engine load (suction pressure, throttle position). These parameters characterize the state of the engine at the moment. At the same engine speed, (let's say 4000 rpm.) there is a difference when driving a car uphill, or when driving downhill.
The characteristic of the engine ignition system required for operation is determined during the engine test at the stand, and, in the future, is specified during the test drive of the car. Optimal performance, ensures optimal fuel consumption, exhaust gas composition and driving performance.
During driving, the control unit receives information from sensors about the engine speed and its load. Based on the characteristic of the ignition system available in the control unit, the control unit determines the optimum ignition timing, for example, in the range from 10°to 0°, to TDC.
In addition to the above parameters, the ignition timing is also influenced by the data of the knock sensor. Since fuel consumption decreases with increasing compression ratio, modern engines tend to increase the compression ratio. However, this can lead to an uncontrolled combustion process of the mixture, which leads to detonation phenomena.
Over time, knocking can lead to engine damage. To avoid this, a knock sensor is required. Its task is to determine the occurrence of detonation, which is a prerequisite for measuring the ignition timing in the retarded direction. The knock sensor is located on the cylinder block and is electrically connected to the ignition control unit. If the sensors that inform the control unit about the state of the engine fail, this can adversely affect its operation, causing a decrease in engine power and an increase in fuel consumption. However, this will not cause serious damage to the engine if the malfunction is quickly repaired.
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