Audi A3

Since 1997 of release

Repair and car operation



Audi A3
+ The maintenance instruction
+ Current leaving and service
+ The engine
+ Systems of cooling, heating
+ The power supply system and release of the fulfilled gases
- Engine electric equipment
   - System of electronic control by ignition and injection
      Self-diagnostics of systems of electronic control of second generation OBD II
      Ignition system
      Checks of system of ignition and injection
      Spark plugs
   + Charge and start systems
+ Manual box of a gear change
+ Automatic transmission and models with a full drive
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Electroschemes





Checks of system of ignition and injection

THE GENERAL DATA

The general check of system of ignition

Special devices are necessary for regular search and elimination of malfunctions. These devices, as a rule, are available on HUNDRED. Therefore here the basic checks are described only:

PERFORMANCE ORDER
1. Check up pressure and a condition of a charge of the storage battery, thus address to subsection Check of the storage battery.
2. Check up all safety locks.
3. Расстыкуйте and again join all штекерные the connections concerning an electronic control system by the engine. Check up position штекерных connections and fixing of cables in an impellent compartment.
4. Check up reliability of connections with weight.
5. Check up tightness of hoses and pipelines. Pay attention to damage of hoses. Fix unreliably joined connections.
6. Check up all high-voltage wires on reliability of landing. The damaged isolation can lead to spark breakdown on weight.
7. On an inside of a cover of the distributor of the engine with working volume 1.6 l can be high voltage leaks. They can be revealed on thin black lines between contacts.
8. To check up, whether pressure or a current moves on system of ignition, follow mentioned below recommendations, but we will notice that current presence not necessarily means presence of sufficient pressure.
Check of giving of a current

The voltmeter is necessary for check:

The Bo-first, check up a corresponding safety lock (№32).
Engines of 1.6 l
9. Remove the tip from the target cascade of system of ignition near to the ignition coil.
10. Connect the voltmeter between contact 1 positive and contact 3 (weight).
11. Include ignition and check up that the voltmeter shows pressure close to pressure of the storage battery. If it not so check up a wire up to the switch (lock) of ignition.
The engine of 1.8 l without турбокомпрессора
12. Uncover in the middle of the engine and disconnect the tip from the target (terminal) cascade.
13. Connect the voltmeter to the average plug 4а and to "weight". Include ignition. Pressure should correspond to pressure of the storage battery approximately. If it not so, check up a wire up to the ignition switch.
The engine of 1.8 l with турбокомпрессором
14. Make the same with that difference that the voltmeter should be connected between contact of a black (dark blue) wire and a brown (yellow) wire. Results of measurements should be same, as well as at the usual engine without турбокомпрессора.
Check of the coil (coils) of ignition

For different engines it is necessary to perform different operations.
The engine of 1.6 l
15. First of all it is necessary to check up appearance of the coil of ignition. At the fused coil the fused weight for coil pouring sometimes can act.
16. The ohmmeter is necessary for measurement with possibility of measurement of high resistance.
17. Switch off ignition and disconnect a wire from connection.
18. Measure by an ohmmeter resistance between plugs 1 and 15. Измеряемется resistance of a primary winding which should be 0.5–1.5 Ohm.
19. Connect an ohmmeter between plugs 15 and 4. Measured resistance of a secondary winding should make 5–9 clod.
20. If the specified sizes of resistance do not correspond measured, it is necessary to replace the ignition coil. Also it is possible to check up the coil of ignition and in a workshop.
The engine of 1.8 l without турбокомпрессора

At this engine of the coil of ignition and the target cascade are connected with each other. Rough check in the assumption is possible only that pressure is submitted (an engine cover is removed):
21. Disconnect all tips from injectors.
22. Disconnect the tip from the target cascade and connect a verifying lamp to one of external contacts and to "weight". Turn the engine a starter and check up, that the lamp blinked.
23. Spend the same check on other contact. The lamp should blink again.
24. If blinkings it is not observed, malfunction can be in following details:

– Connections of wires;
– The management block;
– Gauges.
25. For replacement it is necessary to check up system in a workshop to establish the exact reason.
The engine of 1.8 l with турбокомпрессором

At this engine again check up ignition coils (check of the target cascade is spent separately).
26. Disconnect all tips from injectors. If at check of giving of a current and pressure it is established that one candle does not work, it is necessary to change places of the coil of ignition. If the spark does not become on other candle the coil is faulty. Completely to make sure of it, it is necessary to connect a spark plug to other coil, since. The candle also can have damage.
27. If and now there is no result, disconnect the tip of the corresponding cylinder and measure pressure between contacts. For this purpose connect the voltmeter between both external contacts of the tip and include ignition. The voltmeter should show pressure of the storage battery. If it not so there is a feed circuit rupture to the tip.
28. Connect a control (verifying) lamp to contacts 2 and 3 tips and include ignition and a starter. If the lamp does not blink, it is necessary to check up all system in a workshop.
Check of the switchboard of ignition

At engines 1.8л without турбокомпрессора the switchboard has already been checked up together with ignition coils. At other engines check is made separately.
The engine of 1.6 l

The switchboard is near to the ignition coil. For check make the following:
29. Remove the tip from the target cascade and connect the voltmeter between plugs 2 and 3
30. Turn the engine a starter and check up, that the voltmeter showed pressure not less than 2 Century
31. If it not a hook, is necessary to replace together the coil of ignition and the target cascade, preliminary having checked up them in a workshop.
The engine of 1.8 l with турбокомпрессором

Connection of the switchboard of system of ignition is carried out by two tips which are checked differently. One tip has 5 contacts, another 4 contacts. They are established at the left and on the right on the switchboard.
32. Disconnect tips from all injectors.
33. Oтсоедините the 4-contact tip from the target cascade (under a cover of the case of the air filter). Tip contacts are located one after another from left to right. Connect one wire of a light-emitting diode sampler to "weight".
34. Other wire of a sampler consistently connect to contacts 1, 2, 3 and 4 tips, including thus a starter. At all checks the light-emitting diode should blink. If it not so there are malfunctions. Thrust the tip into place.
35. Remove the 5-contact tip. Tip contacts settle down one after another from left to right.
36. A free wire of a light-emitting diode sampler consistently connect to contacts 1, 2, 4 and 5, including thus a starter (contact 3 in the tip plays "a weight" role). The light-emitting diode at these four checks should blink. It means that the entrance signal arrives on the switchboard.
37. If the described check has yielded negative result it is necessary to replace the switchboard.
Check of the gauge of the Hall

As it was already specified, the gauge of the Hall at engines of 1.8 l is on the forward party of a head of cylinders, is direct over a gear belt. At normal work the electronic control system of the engine defines on a signal from the gauge of the Hall the moment of ignition for the first cylinder. If the signal does not arrive, cylinders cannot long work with detonation adjustment. In this case the system of adjustment of a detonation does not work, the moment of ignition is late a little to prevent a detonation. To check up the Hall gauge, it is necessary to operate as follows:
38. Disconnect tips of injectors.
39. Having removed a protective cover of a gear belt, it is possible to see the Hall gauge. The tip is below. Extend the rubber plug on the tip of the gauge of the Hall back (the tip remains put on the gauge).
40. Connect a light-emitting diode sampler of pressure to contacts 1 and 2 from the back party. With that end in view contacts are marked on the back party of the tip in figures. Include a starter for some seconds. At every second turn of the engine the light-emitting diode should flash for short time.
41. Remove the tip from the gauge of the Hall and include ignition.
42. Connect the voltmeter between contacts 1 and 3 tips. Value of pressure should be 4.5 – 5.5 Century
43. Now connect the voltmeter between contacts 2 and 3 tips. Pressure should make 4.3 – 5.2 Century
44. If values of pressure correspond specified, but the light-emitting diode blinks, it is necessary to replace the Hall gauge. If values of the measured pressure do not correspond specified, malfunction in connections of wires. Eliminate in a workshop.
Check of the gauge of turns of the engine

The gauge of number of turns is over a gear wreath of a flywheel. The ohmmeter is necessary for its check.
45. Disconnect the tip from the gauge of number of turns (the grey tip).
46. On a tip inside connect an ohmmeter to contacts 1 and 2 (№1 – at the left). Value of resistance should be 480–1000 Ohm. If the measured resistance leaves for these limits it is necessary replace the gauge.
47. If resistance corresponds to norm, connect an ohmmeter between contacts 1 and 3 and between contacts 2 and 3. The ohmmeter should show infinity, otherwise replace the gauge.
48. If all details are serviceable, there can be a wire breakage.

Check of the gauge of a detonation

On the engine of 1.6 l one gauge of a detonation is established only. Electric check of this gauge is impossible. Malfunctions can be defined by interrogation of memory of the device of diagnostics with use of special devices. Tips are behind a broad tank of system of cooling and can be checked up on presence of corrosion or other external damages. All other works make in a workshop.
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