Mercedes S-Class W-220
since 1998 release
Repair and operation of the car
+ Mercedes-Benz cars of the class S (W220)
+ Operation manual
+ Routine maintenance
+ Cooling system and heating
+ Power supply system and release
- Engine electric equipment
- System of ignition and engine management
Basic elements of system of microprocessor management
Checks of a control system of ignition and injection
Search of malfunctions - the general information and preliminary checks
Check and adjustment of a corner of an advancing of ignition
Self-diagnostics of systems of electronic control of the second generation of OBD II
The controller of interface of the personal computer to onboard system of self-diagnostics of OBD II under protocols of the SAE standards (PWM and VPW) and ISO 9141-2
Application of an oscillograph for observation of signals in chains of control systems
Digital tire of data of CAN
+ Systems of a charge and start
+ Automatic transmission
+ Power shafts
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
+ Schemes of electric equipment
Search of malfunctions - the general information and preliminary checksOscillograms of signals of management of ignition
Function chart of system of microprocessor control of V6 and V8 ME SFI 2.0 engines
Connection of sockets of coils of ignition
Scheme of connections of coils of ignition
Address also the Section Diagnostics of Malfunctions of Introduction and the following Sections Self-diagnostics of Systems of Electronic Control of the Second Generation of OBD II, Controller of Interface of the Personal Computer with onboard system of self-diagnostics of OBD II under 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 only the system of ignition is considered, some from its component perform several functions concerning functioning of fuel system.
The system of ignition and fuel system have the general diagnostic system intended for preservation of codes of malfunctions and performing diagnostics. At malfunction emergence the control unit writes down some sequence of signals (a malfunction code) which can be considered the special device subsequently in memory (address the Section Self-diagnostics of Systems of Electronic Control of the Second Generation of OBD II in which the description of the procedure of check of fuel system is provided).
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 electrical wiring).
Visual check of an electrical wiring and sockets is not enough — surely consider information which is stored in memory of the control unit.
If malfunction arose soon after service of any knot, first of all carefully check this knot and surrounding space. Perhaps, the reason is covered in carelessly installed component or unreliably attached socket.
If you try to find the reason of a certain malfunction of the engine, for example falling of power, in addition to the actions given below measure a compression in cylinders. Make sure that the fuel filter and the air cleaner changed according to the ordered intervals.
Keep in mind that after reading of codes of malfunctions they need to be removed from memory of the control unit by means of the same diagnostic scanner then to eliminate malfunction.