Vehicle ignition system Mercedes S-Class (W140)

Basic elements of a microprocessor control system
Vacuum connection diagrams and the location of the main elements of the control systems are shown in the illustrations to the Sections Fuel injection and fuel supply...

Checking the ignition and injection control system
General information The ignition system components are very reliable. Failures are usually due to unreliability or contamination of contacts. Breakdowns in high-voltage...

Troubleshooting — General Information and Preliminary Checks
Note: Please also refer to Section Troubleshooting Introductions . The ignition system and the fuel system are interconnected components of the engine management system....

Checking and adjusting the ignition timing angle
Since the ignition timing is constantly monitored and adjusted by the engine management system, there is no nominal value. Manual checking and adjustment is not...

Spark plugs — checking condition
General description The spark plug consists of a central electrode, an insulator with a housing and a ground electrode(s). A spark jumps between the central electrode...

Self-diagnosis of electronic control systems OBD
The OBD system includes several diagnostic devices that monitor individual parameters of the toxicity reduction systems and record detected failures in the on-board...

Diagnostics of the electronic system of automatic air conditioning (A/C)
Diagnostic codes can be read from the display of the KV control unit in addition to a special scanner. Malfunction codes are saved even when the battery is disconnected....

Using an Oscilloscope to Monitor Control System Signals
General information Digital multimeters are great for testing static electrical circuits and for recording slow changes in monitored parameters. When performing dynamic...

Ignition Coil Installation Details
Ignition Coil Installation Details for 6-Cylinder Petrol Models 5/1 - Pipeline cover with wiring 12 — Pipeline T1/1-T1/3 — Ignition coils Installation details of...

Removal, installation and adjustment of the camshaft position sensor (CMP)
Removal CMP Sensor Installation Details 1 - Sealing ring; 2 - Adjusting washer; 3 - Bolt; 4 - CMP sensor; 5 - Pin connector Adjusting the CMP sensor gap 1 - Probe 2 —...

Ignition distributor installation details
Ignition distributor installation details (m119.97 engines) 13 - Rotor (runner); 14 - Cam; 14a - Cam groove; 15 - Distributor cover; 16 - Shielding cover; 17 - Lid; 18 -...

Engine Electrical System Specifications
Note: Individual characteristics are also given in the text of the Chapter and, if their implementation is mandatory, are highlighted in bold. Battery, RC/Ah S280, S320...

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W140 (1991-1998)