Mercedes S-Class W-140

1991-1999 of release

Repair and operation of the car



Mercedes S-Class
+ Mercedes-Benz cars of the class S (W-140)
+ Operation manual
+ Routine maintenance
+ Engine
+ Cooling systems, heating
- Power supply system and release
   - A power supply system and injection of fuel of the petrol engine - the general information
      Security measures and rules of respect for purity during the work with fuel system
      Dropping pressure in fuel system of the petrol engine
      Check and adjustment of speed of the single course / moment of ignition/concentration WITH
   + System of injection of fuel of the diesel engine - the general information
   + Control system of injection of fuel and HFM-SFI ignition (6-cylinder petrol engines)
   + Control systems of the LH-SFI and ME-SFI engine (8-cylinder petrol engines)
   + Control systems of injection of fuel and ignition of ME-SFI and LH-SFI (12-cylinder petrol engines)
   + Control system of fuel injection (diesel engines of the OM603.971 series)
   + Control system of fuel injection (diesel engines of the OM606.961 series)
   + System of a turbo-supercharging - the general information
   Systems of decrease in toxicity of release - the general information
   System of production of the fulfilled gases - the general information
   Catalytic converter (petrol models)
+ Engine electric equipment
+ Gear shifting box
+ Automatic transmission
+ Coupling
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment






Power supply system and injection of fuel of the petrol engine - the general information

General information

Are a part of fuel system: established in a back part of the car (under a pillow of a back seat) the fuel tank with an adsorber on absorbent carbon, fuel-supply lines, the electric fuel pump, and also the electronic system of consecutive injection operated by the control unit.

The reserve of fuel is shown to the driver on the dashboard. Gather on the petrol engine of couple of gasoline in an adsorber and move in engine combustion chambers.

Style of driving of the car has significant effect on fuel consumption. Several councils for the reasonable handling of the accelerator pedal are given below.

  • After start of the engine at once start even if it occurs on a frost;
  • At a car stop for a while more on 40 with, switch off the engine;
  • Move always on the highest transfer;
  • At the movement on long distances whenever possible support uniform speed. Avoid the movement at high speeds. Drive the car circumspectly. Without need you do not brake;
  • You transport the car excessive freight. If the luggage carrier is not used, remove it from a roof;
  • Check air pressure in tires. Do not allow excessive pressure decrease.
  • Function charts of systems of injection, scheme of vacuum connections and arrangement of components of control systems of the engine

    The function chart of system of injection of vdigatel 119 and 104 (the engine 119 is shown)

    40 — the Diaphragm regulator of pressure
    55 — the Fuel filter
    60 — the Vacuum device
    74 — a fuel Cooler
    75 — the Fuel tank
    76 — the Ventilating valve
    77 — the Coal adsorber of vapors of gasoline
    89 — the EGR Valve (left on the engine 120)
    89a — the Right EGR valve on the engine 120
    98 — the Damping pneumatic device of switching to the raising transfer
    125 — the Air pump
    126 — the Valve of a cut-off of admixture of air in a final collector
    127 — the Backpressure valve of admixture of air in a final collector (left on the engine 120)
    127a — the Backpressure valve of admixture of air in right, on the engine 120, a final collector
    128 — the Backpressure valve (depression)
    135 — the Backpressure valve (depression creation)
    136 — the Vacuum chamber
    156 — the Final collector
    158 — the Catalytic converter
    A1e26 — the Control lamp of refusals (MIL/" Check the engine")
    A9 — the K/V Compressor
    A16 — Sensors of a detonation (KS)
    A16g1 — the Left sensor of a detonation of KS
    A16g2 — the Right sensor of a detonation of KS
    B2/2, B2/3 — the Thermometric sensor of measurement of mass of air (MAF)
    B11/2 — the 4-contact sensor of temperature of cooling liquid (ECT)
    B11/7 — the Sensor of temperature of the soaked-up air (IAT)
    B11/9 — the Left ECT sensor
    B17/5 — the Left IAT sensor on the engine 120
    B17/6 — the Right IAT sensor on the engine 120
    B17/7 — the Sensor of temperature of the soaked-up air (IAT)

    G3/2 — Warmed up a lambda probe (left on the engine 120)
    G3/4 — Right warmed up a lambda probe on the engine 120
    K17 — the Relay of system of admixture of air in a final collector
    K27 — the Relay of the fuel pump
    K27/1 — the Left relay of fuel pumps 1 and 2 on the engine 120
    K27/2 — the Right relay of fuel pumps 1 and 2 on the engine 120
    L5 — the Sensor of provision of a bent shaft (CKP)
    L5/1 — the Sensor of position of the camshaft (CMP)
    L5/2 — the Left CMP sensor on the engine 120
    L5/3 — the Right CMP sensor on the engine 120
    L5/4 — the Left CKP sensor on the engine 120
    L5/5 — the Right CKP sensor on the engine 120
    M3m1 — the Fuel pump 1
    M3m2 — the Fuel pump 2
    M16/1 — the Actuation mechanism of acceleration (the drive of a butterfly valve)
    M16/3 — the Left drive of a butterfly valve on the engine 120
    M16/4 — the Right drive of a butterfly valve on the engine 120
    N1/3 — the Control unit of system of ignition EZL/AKR
    N1/4 — the Left control unit of system of ignition on the engine 120
    N1/5 — the Right control unit of system of ignition on the engine 120
    N3/1 — ECM
    N3/2 — the Left ECM on the engine 120
    N3/3 — the Right ECM on the engine 120
    N4/1 — the Control unit of acceleration (the drive of a butterfly valve)
    N4/3 — the Control unit of system of stabilization of turns of idling (IAC)/tempostata
    N16/1 — the Voltage stabilizer
    N59 — the Diagnostic module (the Californian models)


    Funktsonalny scheme of system of injection of the engine 120

    R16/2 — the Model resistor of the module of ignition
    R16/3 — the Model resistor of the left module of ignition on the engine 120
    R16/4 — the Model resistor of the right module of ignition on the engine 120
    S29/3 — the Trailer sensor switch of idling
    S40 — the Switch of a tempostat
    A — Vykl
    B — Dispersal/installation
    SP — Reinstallation
    V \Braking engine/installation
    S65 — the Safety switch of an overload of transmission (a tape brake of B1)
    S65/1 — the Safety switch of an overload of transmission (a tape brake of B21). Engine 120
    T1 — the ignition Coil
    T1/1 — the Coil of ignition of the right head of cylinders on the engine 120
    T1/2 — the Coil of ignition of the left head of cylinders on the engine 120
    Y3/3 — the Pneumatic valve of a damper of switching to the raising transfer
    Y27 — the Switching EGR valve

    Y27/2 — the Left EGR switch on the engine 120
    Y27/3 — the Right EGR switch on the engine 120
    Y32 — the Switching valve of the pump of admixture of air in a final collector
    Y33 — the Electromagnetic coupling of the pump of admixture of air in a final collector
    Y49 — the Electromagnetic valve of the regulator of the camshaft
    Y49/1 — the Electromagnetic valve of the regulator of the camshaft of the left head of cylinders on the engine 120
    Y49/2 — the Electromagnetic valve of the regulator of the camshaft of the right head of cylinders on the engine 120
    Y58/1 — Pnevmopereklyuchatel of a coal adsorber
    Y58/2 — the Left pneumoswitch of a coal adsorber on the engine 120
    Y58/3 — the Right pneumoswitch of a coal adsorber on the engine 120
    Y62 — Fuel injectors (the left number of cylinders on the engine 120)
    Y63 — Fuel injectors of the right number of cylinders on the engine 120


    Scheme of laying of vacuum lines (engines 104)

    1 — the Vacuum receiver
    2 — the depression Distributor
    3 — the Resonant gate
    4 — the air cut-off Valve (with the built-in control valve)
    5 — the Electric vacuum pump
    6 — the Valve switch of the air pump
    7 — the Vacuum control valve

    8 — the Diaphragm regulator of pressure
    9 — the Sensor of absolute pressure in the inlet pipeline (MAP)
    10 — the Valve of management of a purge
    11 — To a coal adsorber
    12 — the Activator of a butterfly valve


    Scheme of laying of vacuum lines (engines 119)

    1 — the Vacuum receiver
    2 — the Control valve of giving of depression
    3 — the Diaphragm regulator of pressure
    4 — the Valve of management of a purge
    5 — To the module of management of system of injection ME-SFI

    6 — To a coal adsorber
    7 — the Electric air pump
    8 — the air supply shutdown Valve
    9 — the Sensor of absolute pressure in the inlet pipeline (MAP)
    10 — the Valve switch of the air pump


    The scheme of an eyeliner of vacuum and vaporizing lines to the inlet pipeline (engines 120)

    40 — the Diaphragm regulator of pressure
    125 — the Air pump
    126 — the air cut-off Valve
    126a — the Right valve of a cut-off of air
    127 — the Left control valve (air admixture)
    128 — the Vacuum control valve
    135 — the Control valve of the line of giving of depression
    136 — the Vacuum receiver
    M16/3 — the Left activator of an electronic accelerator /
    темпостата / control units turns
    idling. In the left part of the power unit

    M16/4 — the Right activator of an electronic accelerator /
    темпостата / control units turns
    idling. In the right part of the power unit
    Y32 — the Valve switch of the air pump
    Y33 — the Electromagnetic clutch coupling air
    pump
    Y58/2 — the Left valve of management of a purge
    Y58/3 — the Right valve of management of a purge
    a — to a coal adsorber
    rt — red
    gr — gray
    sw — black
    tr — neutral


    The injector of the first cylinder is in the right forward part of the power unit (on the example of the 12-cylinder engine)

    Assembly of the fuel pump is located under the car, ahead of the right back half shaft

    The relay of the fuel pump is on the right in the luggage compartment, behind the back assembly block of safety locks

    The sensor of a reserve of fuel is in the left forward corner of the luggage compartment, on the fuel tank

    The valve of switching of the inlet pipeline is located under the inlet pipeline (bottom view)

    The left thermometric measuring instrument of mass of air (MAF) is located in the right part of a motive compartment, on an air inlet sleeve

    The left sensor of temperature of cooling liquid is located at the left in a forward part of the power unit

    The right sensor of temperature of cooling liquid is located at the left in a forward part of the power unit

    The sensor of temperature of cooling liquid (ECT) is in the top part of the left forward corner of the power unit

    The left sensor of a detonation (KS) is in deepening from above on the engine (in a picture the engine is removed from the car)

    The left sensor of a detonation (KS) 1 is in deepening from above on the engine (in a picture the engine is removed from the car)

    The left sensor of position of the crankshaft of a bent shaft (CKP) on the V12 engine, - on the right on a back wall of the block of the engine (in a picture the engine is removed from the car)

    The right sensor of position of the crankshaft (CKP) on dvigatelev12, - behind in the top part of the block of cylinders (the engine is removed from the car)

    Left dokataliticheskiya a lambda probe 1, - under the car, closely to DP, over the catalytic converter

    Dokatalitichesky a lambda probe 1, - under the car, closely to DP, on tubular section of system of release, in front of the catalytic converter

    Left post-catalytic a lambda probe 2, - under the car, near DP

    Post-catalytic a lambda probe 2, - under the car, near DP under a back seat, in a pipe of system of release behind the catalytic converter

    The electromagnetic coupling of the pump of admixture of air is from below in the right forward corner of a motive compartment

    The right valve of a purge of an adsorber is located in the left part of a motive compartment, on a mudguard of a wheel arch

    The left valve of a purge of an adsorber is located in the right part of a motive compartment, on a mudguard of a wheel arch, behind a broad tank of the cooling system

    The valve of a purge of an adsorber is in the left forward corner of a motive compartment, on a mudguard of a wheel arch

    The valve of a cut-off of a purge of an adsorber is located under the car, in a back part of an arch of the left back wheel