Audi A4

since 1994 release

Manual of the car

Audi A4
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ System of an exhaust
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and channels of absorption
- System of injection
   - System of injection Motronic
      The major knots
      So the system of injection 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)
      Cable of a butterfly valve
      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
+ System of ignition
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics


The help at malfunctions

System of injection Motronic

Its reasons
Your help
A. The cold engine is not got or started badly 1. Defective safety lock 15, 28, 29, 32 or 34
2. Defect of the relay of supply with power supply
3. The fuel pump does not give fuel or gives insufficient quantity
4. The fuel pressure regulator is faulty
5. The sensor of temperature of cooling liquid is faulty
6. The knot of management of a butterfly valve is faulty
7. The control unit is faulty
8. Malfunction in wires between Hall's sensor and the control unit
9. Additional air comes to the engine

Check if it is necessary, replace
There is a gasoline in a tank? Check the pump, measure amount of the given fuel
Measure pressure
Check in a workshop
Check in a workshop
Check wires on all length
Check all hoses

B. The warmed engine is not got or started badly 1. The vacuum hose to the regulator of pressure of fuel is faulty
2. See. And 2–9
3. Injection valves are untight
Check a hose
Check valves
C. The engine is started, but again becomes deaf 1. See. And 6
2. The knot of management of a butterfly valve is not adapted (only after replacement of knot or dismantle and installation)
3. See. In 1
4. It is faulty a lambda probe
Check the valve
Carry out the main installation in a workshop
Check functioning if it is necessary – replace
D. The cold engine shivers idling 1. See. And 2 and A 5
2. See. With 2
E. The warmed engine shivers idling 1. See. And 6
2. See. With 2
F. Turns of idling fall at full turn of a wheel by means of the servo-driver 1. See. And 6
2. See. With 2
G. The engine works with interruptions 1. The fuel filter got littered
2. See. And 3
3. See. In 3
4. See. With 5
Replace the filter
H. Fluctuations of speed at 2000–3000 rpm. See. And 7  
I. The engine works unevenly, with interruptions See. And 3  
J. Insufficient engine capacity 1. See. And 3, 6 and 9
2. The butterfly valve does not pass into the provision of full gas
Adjust a cable of a butterfly valve
K. The engine does a backfire in an inlet collector See. And 4