Mercedes S-Class W-220

since 1998 of release

Repair and car operation



W220 Mercedes
+ Mercedes-Benz Cars of a class S (W220)
+ Operation manual
+ Routine maintenance
+ Engine
+ cooling and heating Systems
+ Power supply system and release
- Engine electric equipment
   - Ignition and engine management system
      Basic elements of system of microprocessor management
      Checks of a control system by ignition and injection
      Search of malfunctions - the general information and preliminary checks
      Check and adjustment of a corner of an advancing of ignition
      Spark plugs
      Self-diagnostics of systems of electronic control of the second generation of OBD II
      The controler of interface of the personal computer with onboard system of self-diagnostics of OBD II according to protocols of the SAE standards (PWM and VPW) and ISO 9141-2
      Oscillograph application for supervision of signals in chains of control systems
      Digital tire of data of CAN
   + charge and start Systems
+ Automatic transmission
+ Power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ electric equipment Cхемы






Search of malfunctions - the general information and preliminary checks

Oscillograms of signals of management of ignition

Address also to the Section oscillograph Application for supervision of signals in chains of control systems.
1 — a CKA crankshaft Angle of rotation
2 — cylinder Number
3 — the Signal of the L5 CKP sensor of position of the crankshaft

4 — the Signal of the sensor of the Hall of B6/1 of provision of a cam-shaft
5 — the Signal of turns of the TNA engine


Function chart of system of microprocessor management of V6 and V8 ME SFI 2.0 engines

50 — the Compressor
55 — the Fuel filter
55/2 — the Regulator of pressure of fuel 5.0 a bar
55/3 — the Regulator of pressure of fuel 5.3 a bar
55/3a — Zaslonka
55/4 — the razbryzgivaniye Chamber
71 — the Control valve
75 — the Fuel tank
76 — the Ventilating valve
77 — the Coal adsorber
77/1 — Ventilation
89 — the EGR Valve
95 — the Pump of pumping of a mix
110/2 — the Cooler of forced air
110/10 — the Low-temperature cooler
110/11 — Additional low-distemper-turny a cooler
126/1 — the Left valve of shutdown of a podmeshivaniye of secondary air
126/2 — the Right valve of shutdown of a podmeshivaniye of secondary air
128 — the Transient vacuum valve
157 — the Three-functional catalytic converter at a partition of an impellent compartment
158 — the Three-functional catalytic converter under the bottom
A1 — the Control panel
A1е58 — the Control lamp of problem diagnostics of the engine
A16/1 — the Sensor of a detonation 1 (the right side of the engine)
A16/2 — the Sensor of a detonation 2 (the left side of the engine)
B4 — the Fuel level sensor
B4/7 — the Sensor of pressure of fuel
B6/1 — the Sensor of effect of the Hall of a camshaft
B11/4 — the Sensor of temperature of cooling liquid (CTS)
B17/8 — the Sensor of temperature of forced air
B28/8 — the Sensor of pressure of forced air 1
B37 — the Sensor of provision of a pedal of an accelerator
B40 — the Sensor of level/temperature/quality of oil
B40/2 — the Sensor of pressure of oil of system of shutdown of cylinders 1
CAN «B» — the Tyre of data in salon
CAN «C» — the Tyre of data in an impellent compartment
G2 — the Generator
G3/3 — Left dokataliticheskiya a lambda probe
G3/4 — Right dokataliticheskiya a lambda probe
G3/5 — Left post-catalytic a lambda probe
G3/6 — Right post-catalytic a lambda probe
K40/5kt — the Relay of the fuel pump
K40/7kL — the starter Relay
K40/7kN — the Relay of system of a podmeshivaniye of secondary air
K40/8kW — the Relay of forced air

K40/8kX — the Relay of the fuel pump built in a tank
L5 — the Sensor of provision of a cranked shaft (CKP)
L6/1 — the Sensor of the left forward wheel
L6/2 — the Sensor of the right forward wheel
L6/3 — the Sensor of the left back wheel
L6/4 — the Sensor of the right back wheel
M1 — the Starter
M3 — the Fuel pump
M3/1 — the Pump which has been built in a fuel tank
M4/7 — Elektroventilyator of the engine and KV with the built-in control unit
M16/6 — the butterfly valve Activator
M16/7 — the Drive of a zaslonka of retsirkulyatsionny air
M33 — the Electric air pump
M44 — the Circulating pump of a cooler of forced air
N2/7 — the Control unit of limiting systems
N3/10 — the Module of management of injection of fuel (ME-SFI)
N15/3 — the Module of management of electronic antiprobuksovochny system (ETC)
N15/5 — the Control unit of the lever of the AT selector
N22 — the Module of management of the press button of a control system of additional air (AAS)
N47-1 — the Module of management of the monitoring system of draft (ASR) / system of hydrostrengthening of a wheel (SPS) sensitive to speed
N47-5 — the Control unit stabilization (ESP), SPS and the amplifier of brakes (BAS)
N73 — the Control unit of the electronic ignition key (EIS [EZS])
N80 — the Block of a steering column
N118 — the Control unit the fuel pump
S9/1 — the Sensor switch of stoplights
S40/4 — Variatorny the switch темпостата
T1/1 - T1/8 — Dual coils of ignition of cylinders 1-8
X11/4 — the Diagnostic DLC socket
Y2/1 — Э / the magnetic coupling of the supercharger of blown air
Y32 — the Valve switch of the air pump of system of a podmeshivaniye of secondary air (AIR)
Y58/1 — the Valve of management of an adsorber purge
Y62 — fuel Injectors (LH-SFI, HFM-SFI, PEC [LH, HFM, PMS])

1 Only the engine 113.960 with system of shutdown of cylinders (code 479)


Connection of sockets of coils of ignition

5/1 — Tips of VV of wires
T1/1-T1/6 — Dual coils of ignition of cylinders 1-6
3-contact socket
1 — the Chain 1b

2 — the Chain 15
3 — the Chain 1а
and and b — VV - connections


Scheme of connections of coils of ignition

R4 — Candles
N 3/10 — the Control unit

L1 — Primary windings
L2 — Secondary windings



Address also to the Section Diagnostics of malfunctions of Introduction and to below-mentioned Sections Self-diagnostics of systems of electronic control of the second generation of OBD II, the Controller of interface of the personal computer with onboard system of self-diagnostics of OBD II according to protocols of the SAE standards (PWM and VPW) and ISO 9141-2.

The system of ignition and fuel system are the interconnected components of a control system of the engine. In spite of the fact that in this Chapter the system the ignitions some from its component is considered only carry out some functions concerning functioning of fuel system.

General information

The system of ignition and fuel system have the general diagnostic system intended for preservation of codes of malfunctions and carrying out diagnostics. At malfunction emergence the control unit writes down some sequence of signals (a malfunction code) which it is possible to consider subsequently as the special device (address to the Section Self-diagnostics of systems of electronic control of the second generation of OBD II in which the description of procedure of check of fuel system is provided) in memory.

If failures in operation of the engine of the car are observed, the reason of it, most likely, can be found out, having investigated memory of the control unit. After reading of codes of malfunctions it is possible to find out, what knot is faulty, and to execute the corresponding checks (either the knot, or its electroconducting).

It is not enough visual check of electroconducting and sockets — surely consider information which is storing in memory of the control unit.

Preliminary checks

If malfunction arose soon after service of any knot, first of all carefully check this knot and surrounding space. Probably, the reason is covered in carelessly established component or unreliably attached socket.

If you try to find the reason of a certain malfunction of the engine, for example capacity falling, in addition to the actions given below measure a compression in cylinders. Be convinced that the fuel filter and an air purifier changed according to the ordered intervals.

Keep in mind that after reading of codes of malfunctions it is necessary to remove them from memory of the control unit by means of the same diagnostic scanner then to eliminate malfunction.

 PERFORMANCE ORDER

1. Open a cowl and be convinced of reliability of accession of tips of wires to plugs of the accumulator and absence of corrosion on them. At detection of traces of corrosion or damages replace or clear wires. Similarly check all tires of grounding, having convinced that they provide reliable contact (interfaced surfaces should be absolutely pure and without corrosion traces) with a body or the engine.
2. After that attentively examine all visible conducting laid in an impellent compartment. Be convinced of reliability of all connections. At this stage you obviously damaged wires interest. They can be cut or ground about sharp or moving knots of the engine, for example, details of a suspension bracket or a driving belt. Break of a wire can result from negligent installation of any knot. The wire can melt at contact to release system. The most probable cause of damage of conducting is the wrong laying of its plaits in an impellent compartment after performance of repair or service of any knot.
3. Wires can be damaged or short-circuited without damage of their isolation. In this case survey to anything will not lead. Similar damages can arise after a pulling of wires or the wrong placement of conducting in an impellent compartment. If you consider that similar damage is possible, check a wire, following the sequence stated below.
4. The damaged wire can be repaired, having soldered in in a gap a piece of a new wire. The soldering is necessary for receiving reliable contact. Isolation can be restored enough of an insulating tape or a thermoshrinkable tube. If damages are considerable and the damaged wire plays an essential role, the most true exit (though) replacement of the corresponding plait on new will be rather expensive.
5. After restoration of the damaged wire correctly arrange it in an impellent compartment, far from rotating and hot knots. Do not forget to fix a wire in intermediate clamps (if is).
6. Be convinced of reliability and purity of all available sockets. All clamps should be established. If on an internal surface of the socket you cover up corrosion traces (white or green deposits, and also rust traces) or excessive pollution, remove it from the corresponding plug and carefully clear. For this purpose you can use special spray. If the socket is seriously damaged, it is necessary to replace it. Keep in mind that in certain cases you should replace a plait entirely.
7. If you could remove completely corrosion traces from the socket, fill it with preserving greasing then establish into place. You can learn greasing type on HUNDRED.
8. On all models the sensor of position of the crankshaft (VMT of the first cylinder decides on its help also) is established. Its working part can be polluted by oil or a dust that can lead to failures in its work and, respectively, to ignition admissions.
9. Attentively examine all vacuum hoses and the tubes located in an impellent compartment. Be convinced of reliability of an inhaling of collars and lack of cracks, stratifications and traces of damages on hoses. Be convinced also that no hoses not передавлены and are bent too strongly, i.e. do not pass air. Special attention give to the hoses located near keen edges, and also the ends of all hoses. It is necessary to replace all damaged hoses.
10. Be convinced of lack of traces of damages and pollution on hoses of system of ventilation of a case. Be convinced also that they are not blocked from within. The quantity and installation sites of hoses of system depends on car model, but on all models the hose connecting the top part of the engine to a hose by an air inlet or the inlet pipeline is established. Hoses of system connect also the block of cylinders (or a maslozalivny mouth) to the inlet pipeline. These hoses deliver pairs of oil in combustion chambers. At pollution or blocking of these hoses the engine will unstably work (especially at single turns).
11. Following from a fuel tank via the fuel filter to the fuel distributive highway along fuel pipelines, attentively examine them. At detection of traces of damages or excesses replace the corresponding section. Special attention give to junctions of tubes. On them there can be the cracks leading to leakages of fuel.
12. Uncover cases of an air purifier and examine an element. It should be rather pure and dry. Strongly polluted cleaner shows strong resistance to an air stream that leads to appreciable decrease in engine capacity. Replace an air purifier if necessary.
13. Start the engine and leave it to work at single turns.

At performance of any works in an impellent compartment at the working engine be extremely careful. Besides high probability of receiving burns from the heated details of the engine or release system, you risk to get a serious trauma from rotating details (for example, the fan of a radiator or a driving belt). Before the work beginning, first of all take measures and observe safety measures stated at the beginning of each Chapter. Watch the hands, do not allow hit of long hair or clothes in an impellent compartment. Steer clear of system of release and other hot details.

14. Following from an air inlet to an air purifier and further to a throttle, be convinced of absence of leaks from hoses of supply of air (including nearby vacuum hoses). They can be found on characteristic whistle. If whistle is not distributed, put a small amount of soap water on suspicious section of a hose. If the hose is damaged, kind of work of the engine will change, and on the processed surface of a hose there will be bubbles (or, depending on pressure in a hose, water can start to be soaked up inside). At leak detection reliably tighten a collar or replace the damaged hose.
15. Similarly check all system of release (from a collector to back section). Be convinced of absence of leakages of gases. For simplification of work you can lift the car on the lift, establish on a platform or over a hole. For carrying out the simplest check stop up a final opening of system of release and listen to system work. If you heard characteristic whistle, leak takes place. At detection of leak tighten the corresponding collar, bolts or nuts, replace laying or the burned-through section.
16. Further check consists in serial moving of each socket on the corresponding plug at the working engine. Unreliable contact will be determined by change of kind of work of the engine. Restore reliability of contact, having replaced or having cleared the corresponding socket. Keep in mind, it is necessary what in certain cases to change the whole plaits.
17. If as a result of preliminary checks you did not find the reason of unstable operation of the engine, the car should be driven away on service station for carrying out more careful diagnostics with use of the special equipment.