Mercedes of the S-class W202

1993-2000 of release

Repair and operation of the car

Mercedes W202
+ 1.2. General information
+ 2. Maintenance
+ 3. Engines
+ 4. Lubrication system
+ 5. Cooling system
+ 6. Heating, ventilation
- 7. System of ignition
   7.2. Safety measures at repair of electronic system of ignition
   7.3. Ignition coils
   + 7.4. Spark plugs
   - 7.5. Device of a preliminary warming up of the diesel
      - 7.5.1. Check of the device of a preliminary warming up Glow lamp Anchor Glow plugs Temperature sensor of cooling liquid The thermal sensor of the soaked-up air
      7.5.2. Self-diagnostics of the device
+ 8. Fuel system
+ 9. Transmission
+ 10. Running gear
+ 11. Steering
+ 12. Brake system
+ 13. Body
+ 14. Electric equipment
+ 14.2. Electrical circuitries Glow plugs


To check consumption of current separate glow plugs, the auto repair shop uses the ampermeter of a direct current. Current-measuring pincers are clamped over the corresponding isolated wire, and the size of current is measured by induction.


1. Current-measuring pincers if are available, clamp over the separate wires going to glow plugs, establish ignition on a warming up (the engine cold) and measure consumption of current. Placement of wires: cylinder 1 = black-blue; cylinder 2 = black-violet; cylinder 3 = black-red; cylinder 4 = black-yellow; cylinder 5 = black-green.
2. 2,0 l engine: about 8 seconds later consumption of current each glow plug has to make around 14-16 And.
3. 2,2 / 2,5 l engine: about 10-20 seconds later consumption of current each glow plug quickly has to make around 8-15 And.
4. If the measured value exceeds the top preset value, replace the corresponding glow plug.
5. If the measured value below of the lower preset value of a glow plug, then check the current carrying line for break.
6. If there are no current-measuring pincers, establish ignition on a warming up (the engine cold) and connect a control bulb between the plug of a glow plug and the block of cylinders of the engine. The control bulb has to flash, otherwise check for break a tokopodvodyashchy wire to a glow plug and, respectively, replace it.
7. Switch off ignition.
8. Check glow plugs for passing of electric current. For this purpose shoot the plug for candles of G1-G4 (G5) with the relay of management of a warming up.
9. Measure by an ohmmeter one by one resistance between counters on the plug and the case (the block of cylinders of the engine). If resistance strives for infinity (оо), then break in a glow plug or in the tokopodvodyashchy line.

In the relay of management of a warming up electronic protection against short circuit is built in. At short circuit in glow plugs or electric wires the chain of current is broken off. The relay can function again in that case when short circuit is eliminated or if the ignition key is turned back in situation "0".



1. Remove the inlet gas pipeline.
2. Unscrew a nut for the electric line.


At some models the nut is inserted as the integral accessory into a cable tip of the line.

3. Unscrew a glow plug a flexible face key of SW 12.

ENGINE 2,2 / 2,5 L


1. Remove the plug (shooter) with a glow plug.
2. Unscrew a glow plug (R9) a face key of SW 12.

Glow plugs with the burned-through pins

The burned-through pins of candles of an incandescence often are a consequence of malfunctions of nozzles which are not caused by shortcomings in or on glow plugs.

If such glow plugs are found, then it is not enough to replace of them. It is also necessary to make check of nozzles on formation of a stream of injectable fuel, vibration, pressure and tightness (work for auto repair shop).


1. Twist glow plugs with m 20 N.' moment.
2. Screw the electric line together with a nut with m 4 N.' moment, therefore, manually, respectively, with the plug.
3. 2,0 l engine: remove the inlet gas pipeline.
4. 2,2 / 2,5 l engine: remove a cross pipe of the air filter.