Mercedes S-Class W-220
since 1998 of release
Repair and car operation
+ Mercedes-Benz Cars of a class S (W220)
+ Operation manual
+ Routine maintenance
+ 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
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
+ Onboard electric equipment
+ electric equipment Cхемы
Search of malfunctions - the general information and preliminary checksOscillograms of signals of management of ignition
Function chart of system of microprocessor management 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 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.
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.
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.