Mercedes C-Class

W203 since 2000 of release

Repair and car operation

+ Mercedes-Benz Cars of a class C (W-203)
+ Operation manual
+ Routine maintenance
+ Engine
+ cooling and heating Systems
- 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 at 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 a measuring instrument of weight of air
      Check of injectors
      Removal and installation of the fuel distributive highway and injectors
      Check and adjustment of number of turns of the single course/the moment of ignition/concentration WITH
   + System of injection of fuel of the diesel engine. Turbokompressor
   + Systems of release and decrease in toxicity of the fulfilled gases. Turbokompressor
+ engine Electric equipment
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment

Check of injectors

Not tight gates create difficulties at start of the hot engine. The damaged injectors lead to operation of the engine after its switching off and conduct to interruptions in work.


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

Tension and resistance check


1. Check tension. For this purpose disunite sockets of injectors and attach between both contacts of a wire a diode control lamp. Include a starter (assistant). The light-emitting diode should 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.