S-class W202 Mercedes

1993-2000 of release

Repair and car operation

W202 Mercedes
+ 1.2. General information
+ 2. Maintenance
+ 3. Engines
+ 4. Greasing system
+ 5. Cooling system
+ 6. Heating, ventilation
+ 7. Ignition system
- 8. Fuel system
   + 8.1.1. Introduction
   - 8.2. System of injection of petrol engines Principle of work of PMS Principle of work of HFM
      8.2.2. Self-diagnosing of a condition of system of ignition and fuel injection
      8.2.3. Air flowmeter
      8.2.4. A temperature-sensitive element of cooling liquid
      8.2.5. The sensor of soaked-up air
      8.2.6. System of vacuum pipelines
      8.2.7. The fuel distributor with klapanny nozzles
      8.2.8. Klapannye of a nozzle
      8.2.9. Oxygen sensor (lambda probe)
      8.2.10. Diagnostics of malfunctions of system of injection of gasoline
      8.2.11. That it is necessary to know to the owner of the car with the injector engine
      8.2.12. Turbo doctor
   + 8.3. System of injection and food of diesel engines
   + 8.4. System of production of exhaust gases
+ 9. Transmission
+ 10. Running gear
+ 11. Steering
+ 12. Brake system
+ 13. Body
+ 14. Electric equipment
+ 14.2. Electroschemes

b47c026d b47c026d

8.2.10. Diagnostics of malfunctions of system of injection of gasoline


Before on the basis of diagnostics of malfunctions the malfunction is found, the following control preconditions should be executed: correctly start the engine. Both for cold, and for the heated-up engine the fairly following: do not press an accelerator pedal during start, squeeze out a coupling pedal. In a tank there should be a fuel, in the mechanical relation the engine also should be as it should be, the storage battery is charged, the starter rotates with sufficient frequency, ignition system as it should be, the power supply system is tight and is not polluted, case ventilation as it should be, reliable electric connection with the car case (the engine – a transmission – a body) is provided. In a repair truck charge to interrogate memory of malfunctions.


If топливопроводы unscrew, they are necessary for washing out in advance with use of means for cold cleaning (детергентов) or gasoline.

The engine is not started
At inclusion of a starter the fuel pump with the electric drive (it is not audible noise at work) is not started
Slightly knock on the pump case that probably hanged pump could separate. Check, whether tension on the pump moves. Check electric contacts on good conductivity.
The safety lock is faulty
Check a safety lock of the fuel pump.
The relay of the fuel pump is faulty
Check the relay.
To klapanny nozzles tension does not move
To Snimimta shtekkerny sockets from nozzles, connect a control bulb and press a starter. The control bulb should blink poorly. If the bulb gleams: replace the actuation device. If the control bulb is not shone: check the relay of the fuel pump.
The cold engine is badly started, works spasmodically
The temperature-sensitive element is faulty
Check a temperature-sensitive element.
The oxygen sensor is faulty
Charge to check the oxygen sensor, if necessary replace.
The engine stops (works with interruptions)
The electric connections relating to the fuel pump are periodically disconnected
Check on strong and faultless connection shtekkerny connections and connections of electric wires on the fuel pump and its relay. Check a safety lock and kontaktirovaniye places on the relay of the fuel pump. Clean contacts.
Too low volume supply of fuel by the pump
Charge to a repair truck to check volume supply of fuel.
The fuel filter is littered
Replace the fuel filter.
The fuel pump is faulty
Check the fuel pump.
The klapanny nozzle is not tight
Check a klapanny nozzle.
The engine has defects at work on transitional modes
The system of an admission of air is not tight
Check system of an admission of the engine. For this purpose leave to work the engine in a mode of idling and miss the mark with gasoline of a place of an uplrtneniye, and also connection in a soaking-up path. If frequency of rotation quickly increases, it is necessary to eliminate an available leakage. Attention: pairs of gasoline are poisonous, do not inhale them!
The temperature-sensitive element of cooling liquid is faulty
Check a temperature-sensitive element.
The power supply system is not tight
Examine all junctions in a zone of the engine and the electric fuel pump.
The hot engine is not started
Too high pressure in a power supply system
Charge to check pressure in a power supply system, if necessary replace a pressure regulator.
The drain line between a regulator of pressure and the fuel pump is littered or bent Clean or replace the line (pipeline).