Mercedes C-Class

W203 since 2000 of release

Repair and operation of the car

+ Mercedes-Benz cars of class C (W-203)
+ Operation manual
+ Routine maintenance
+ Engine
+ Cooling system and heating
- Power supply system and release
   + Power supply system of the petrol and diesel engine
   - System of injection of fuel of the petrol engine
      Security measures during the work with system of injection of the petrol engine
      Functioning of a control system and injection of the petrol engine
      General check of system of injection of the petrol engine
      Removal and installation of the measuring instrument of mass of air
      Check of injectors
      Removal and installation of the fuel distributive highway and injectors
      Check and adjustment of speed of the single course / moment of ignition/concentration WITH
   + System of injection of fuel of the diesel engine. Turbocompressor
   + Systems of release and decrease in toxicity of the fulfilled gases. Turbocompressor
+ Engine electric equipment
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment

Check of injectors

Untight gates create difficulties at start of the hot engine. The damaged injectors lead to operation of the engine after its switching off and lead to interruptions in work.


1. Start the engine on single turns.
2. Check operation of each separate valve by means of a stethoscope. Clicks indicate opening and closing of valves of injectors.
3. If the stethoscope is unavailable, it is possible to perform the same operation with use of the screw-driver or a finger.
4. If unusual sounds or sounds are found are not found at all, then it is necessary to check tension, resistance and tightness of injectors.

Check of tension and resistance


1. Check tension. For this purpose disunite sockets of injectors and attach a diode control lamp between both contacts of a wire. Include a starter (assistant). The light-emitting diode has to blink.
2. If the light-emitting diode does not blink, malfunction can be in the wire or in the control unit.
3. Switch off ignition.
4. Attach to each injector between contacts an ohmmeter and measure resistance. If on any injector resistance differs, replace it.