VW Passat B5

since 1996 release

Repair and operation of the car



Foltsvagen Passat B5
+ Maintenance instruction
+ 1. Maintenance
+ 2. Engines
+ 3. Cooling system
+ 4. Fuel system
- 5. Engine management
   5.2. Work of a control system of the engine
   5.3. Check of system of injection of fuel
   5.4. Sensors and executive mechanisms of a control system of the engine
   + 5.5. System of ignition
   + 5.6. Fuel highway and fuel nozzles
   5.7. Main malfunctions of a control system of the engine
+ 6. Exhaust system
+ 7. Transmission
+ 8. Running gear
+ 9. Steering
+ 10. Brake system
+ 11. Body
+ 12. Heating, ventilation
+ 13. Electric equipment






5.7. Main malfunctions of a control system of the engine

GENERAL INFORMATION

Before definition of malfunctions be convinced that start of the engine is made correctly. At start of both the cold, and hot engine do not press an accelerator pedal. After start of the hot engine it is possible to increase slightly pressing of a pedal of an accelerator engine turns.

Also before definition of malfunctions be convinced that fuel is available in the fuel tank in enough, the engine has no mechanical defects, the accumulator is charged and the starter turns a bent shaft of the engine with a sufficient speed, the system of ignition is serviceable, the fuel system is tight and in it there are no pollution, a hose of ventilation of a case pure and the tire of grounding of the power unit is reliably connected.

Previously check the malfunctions which are written down in memory of a control system of the engine.

At work on fuel system, previously take off pressure in fuel system.
REASON
ELIMINATION METHOD
The engine is not started
At inclusion of ignition the electric fuel pump does not work Check an electric chain of giving of tension to the fuel pump and reliability of connection of electric sockets.
The safety lock is faulty Check integrity and, if necessary replace a safety lock of the fuel pump or control unit with the engine.
The relay of the fuel pump is faulty Check working capacity and, if necessary, replace the relay of the fuel pump.
Tension on fuel nozzles does not move Check an electric power-supply circuit of fuel nozzles.
The complicated start of the cold engine and operation of the engine with interruptions
Temperature sensor is faulty Check and, if necessary, replace sensors of temperature of cooling liquid and temperature of the air coming to the engine.
The engine works with interruptions
Unreliable contact in electric sockets of a power-supply circuit of the fuel pump Check a state, clear and draw in contacts of electric sockets in a power-supply circuit of the fuel pump.
Check and, if necessary clear contacts of a safety lock and the relay of the fuel pump.
Check productivity of the fuel pump.
Pollution of the fuel filter Replace the fuel filter
The fuel pump is faulty Check operability of the fuel pump.
The fuel nozzle is faulty Check and, if necessary, replace fuel nozzles.
Unstable operation of the engine on the transitional modes
The system of air supply in the engine is untight Check and, if necessary, tighten connections of system of air supply in the engine.
The sensor of temperature of cooling liquid or the air coming to the engine is faulty Check and, if necessary, replace sensors to a temperat ры cooling liquid and temperature of the air coming to the engine.
Tightness of fuel system is broken Visually check tightness of fuel system. Check reliability of connections of fuel system.
The complicated start of the hot engine
Elevated pressure in fuel system Check pressure in fuel system and, if necessary, replace the fuel pressure regulator.
The pipeline of return of fuel between the regulator of pressure of fuel and the fuel tank is hammered or deformed Clean or replace the pipeline.
Acceleration of the engine happens to a delay
Fuel nozzles are untight
Check and, if necessary, replace fuel nozzles.