Audi A4

since 1994 of release

Repair and car operation



A4 Audi
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ exhaust System
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and absorption channels
- Injection system
   - System of injection of Motronic
      The major knots
      So the system of injection of Motronic functions
      Violations in work and self-diagnostics
      The self-help at injection
      Visual control
      Search of malfunctions in separate knots
      Check of idling and exhaust gases
      Check of exhaust gases (AU)
      Butterfly valve cable
      The help at malfunctions
   + System of injection of MPI and MPFI
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
+ ignition System
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ body Details
+ Salon
Search of malfunctions
Technical characteristics





Search of malfunctions in separate knots

Pressure regulator

For measurement of pressure the corresponding manometer (V.A.G 1318) with the locking crane and the adapter is required.

Nominal size idling about 3,5 bar; in the vacuum hose which has been removed from a regulator of pressure, near the 4th bar.

Minimum supported pressure is direct after engine switching off at least the 3rd bar; through 10 mines about 2,5 bar.

Check of valves of injection

Here the socket (1) valve of injection (2) is disconnected. The tension indicator with a light-emitting diode carries out check of giving of tension on injection valves.


 PERFORMANCE ORDER

  1. Check of giving of tension: dismantle facing of a compartment of the engine with working volume of 1,6 l (head Engines); at the engine with working volume of 1,8 l in the beginning pull up for back edge a cover over injection valves, then take out it from the forward party.
  2. Disconnect sockets of valves of injection. For this purpose wring out on their reverse side wire clamps.
  3. Connect to contacts of the disconnected socket the tension indicator with a light-emitting diode.
  4. Let your assistant will turn the engine a starter.
  5. The light-emitting diode of the indicator of tension should flash, otherwise defect in a wire brought to valves of injection, or in the Motronic control unit.
  6. Check of valves of injection: disconnect all sockets of valves of injection.
  7. Connect an ohmmeter to both contacts of the first valve of injection.
  8. Nominal size: 14–16 W (engine of 1,6 l) and 11–13 W (engine of 1,8 l).
  9. Deeper check (type of a stream and tightness):
  10. Dismantle injection valves together with a distributive tube – see in head above. But sockets of wires remain connected, and gasoline pipe lines screwed.
  11. Close resembling jams of an opening in injection valves.
  12. Lower injection valves in four measured glasses.
  13. Let your assistant within several seconds turns the engine a starter: a stream of injection should be identical at all valves. Then picture of a type of a stream as it should be.
  14. Disconnect all sockets of valves of injection.
  15. Switch off ignition and then include it approximately on 5 with: from each valve no more than 2 drops should act. In this case valves are tight.

At a turbodvigatel the sensor of temperature of soaked-up air (2) takes place on an inlet collector behind knot of management of a butterfly valve (1).

At the left: this engine with working volume of 1,8 l with climatic installation has two sensors of temperature on a flange behind a head of the block of cylinders. Figure «1» designated the sensor of climatic installation. In figure «2» – the sensor of system of ignition/injection and the temperature indicator.

At the engine with working volume of 1,6 l the sensor of temperature is on the same place.

On the right: in drawing placement of shtyrkovy conclusions of the sensor is shown.

On the right: in drawing the measuring instrument of a stream of fresh air, priflantsovanny to the air filter of naturally aspirated engines with working volume of 1,6 and 1,8 l is shown.

1–a support of a termoanemometrichesky electrocarrying-out plate;
2–pass for air.

At the left: information on an arrangement of contacts of the three-polar socket is used for check of a measuring instrument of a stream of fresh air in naturally aspirated engines with working volume of 1,6 and 1,8 l.

On the right: at a turbodvigatel with working volume of 1,8 l the measuring instrument of a stream of fresh air is integrated into the case of the air filter. The socket (2) is available from above.

At the left: information on distribution of contacts of the two-port socket is used at check of a measuring instrument of a stream of fresh air of a turbodvigatel with working volume of 1,8 l.

Check of the sensor of temperature of cooling liquid

The sensor of temperature of cooling liquid is the device with double function which in one pair contacts provides with information ignition/injection system, in other pair of contacts – the combined device. Here we check the knot connected with system of ignition/injection.

 PERFORMANCE ORDER

  1. Disconnect the sensor socket in a tube of supply of cooling liquid behind a head of the block of cylinders.
  2. Connect an ohmmeter to contacts «1» and «3» sockets of the sensor.
  3. Consider resistance size at the cooled-down engine and room temperature (about 20 °C).
  4. Nominal size: 1,5–3,0 kiloohms.
  5. If the nominal size is received, the sensor as it should be.

Check of the sensor of temperature of soaked-up air

 PERFORMANCE ORDER

  1. Disconnect the socket on the sensor.
  2. Connect an ohmmeter to contacts of the socket of the sensor.
  3. Consider resistance size at the cooled-down engine and room temperature.
  4. Nominal size: 1,6–2,8 kiloohms.
  5. If the nominal size is received, the sensor as it should be.

Measuring instrument of a stream of fresh air

By own efforts it is possible to check tension giving to a measuring instrument of a stream of fresh air and signal passing on wires to the control unit. If that and another as it should be, at defect in this knot (interview the computer) the measuring instrument of a stream of fresh air is considered faulty:

 PERFORMANCE ORDER

  1. Disconnect the socket on a measuring instrument of a stream of fresh air.
  2. Look at numbering of uvulas of contacts in drawing.
  3. Tension check: at the engine in capacity of 74 kW and 92 kW connect a diode test lamp between the plug "3" on the three-polar socket of the connected wire and "weight" (the engine block).
  4. At a turbodvigatel in capacity of 110 kW a diode test lamp connect between the plug "3" on the two-port socket of the connected wire and weight (the engine block).
  5. Let your assistant will turn the engine a starter (the engine can even be got): the light-emitting diode should flash, in this case tension moves.
  6. Check of passing of a signal: switch off ignition. Disconnect the socket "A" on the control unit.
  7. By means of an ohmmeter check conductivity of wires:
  8. With engines in capacity of 74 kW and 92 kW from a shtyrkovy conclusion «1» on the control unit "A" socket to contact «2» on the three-polar socket of a measuring instrument of a stream of fresh air. Besides, from a shtyrkovy conclusion «9» on the control unit "A" socket to contact «3» on the three-polar socket of a measuring instrument of a stream of fresh air.
  9. With a turbodvigatel in capacity of 110 kW from a shtyrkovy conclusion «1» on the control unit "A" socket to contact «4» on the two-port socket of a measuring instrument of a stream of fresh air. Besides, from a shtyrkovy conclusion «9» on the control unit "A" socket to contact «2» on the two-port socket of a measuring instrument of a stream of fresh air.

Dismantle of valves of injection

 PERFORMANCE ORDER

  1. Dismantle facing of an impellent compartment of the engine with working volume of 1,6 l (head Engines); with the engine of 1,8 l in the beginning pull facing for back edge up, then take out it from the forward party.
  2. Disconnect a vacuum hose from a regulator of pressure of fuel.
  3. For pressure decrease open for short time a cover of a fuel tank.
  4. Weaken screw connection submitting топливопровода. Be careful! Residual pressure! Opening the pipeline, cover it with a rag. Let following fuel drips in a rag.
  5. Dismantle a retsirkulyatsionny gasoline pipe line.
  6. Disconnect sockets of valves of injection. For this purpose wring out at them on a reverse side wire clamps.
  7. At engines with working volume of 1,8 l disconnect the socket of the sensor of the Hall.
  8. Unscrew both fixing bolts of a distributive tube of fuel.
  9. Remove a distributive tube of fuel together with injection valves.
  10. If it is necessary to dismantle one valve of injection, remove a fixing collar and take out the valve from a distributive tube.
  11. At installation track that sealing rings and rubber rings of round section were replaced.
  12. At replacement of a rubber ring of round section at all do not wring out on the valve a plastic cap.
  13. Before installation oil all rubber details. Insert valves together with a distributive tube.

Shtekerny sockets behind at the left in an impellent compartment in the engine with working volume of 1,6 l

1–shtekerny socket lambda probe (black);
2–shtekerny socket of a sensor detonations (green);

3–shtekerny socket of the sensor of frequency of rotation of the engine (gray).

Shtekernye sockets behind at the left in an impellent compartment in the engine with working volume of 1,8 l

1–shtekerny socket lambda probe (black);
2–shtekerny socket of the sensor of frequency of rotation of the engine (gray);

3–shtekerny socket of a sensor of a detonation I (green);
4–shtekerny socket of a sensor of a detonation II (dark blue).