Contents: Crankshaft speed sensor ↡ Electronic control device ↡ Coolant temperature sensor ↡ Throttle position switch ↡ Engine Air Intake Temperature Sensor ↡ Top Dead Center Sensor ↡
Crankshaft speed sensor
Removal
1. Remove the ground cable from the battery.
2. Disconnect the crankshaft speed sensor electrical connector located in the engine compartment behind the battery.
3. The crankshaft speed sensor is located between the engine block and the clutch housing above the starter. Unscrew the bolt and remove the sensor from the clutch housing. Remove the gasket.
Installation
1. Installation is performed in the reverse order of removal. Before installing the crankshaft speed sensor, install a new gasket on it.
Electronic control device
Removal
Location of the electronic ignition control unit on models with the TSZ ignition system
1. The electronic ignition control unit is located on the left side of the engine compartment on the top of the wheel arch (see picture).
2. Remove the ground cable from the battery.
3. Label and disconnect the electronic ignition control unit multi-pin electrical connectors.
4. Disconnect the intake manifold vacuum hose from the control unit and plug the hole.
5. Remove the nuts and remove the electronic control unit from the engine compartment.
Attention! To improve heat dissipation from the electronic control device, its lower surface is covered with a special heat-conducting paste.
Installation
1. Installation is carried out in the reverse order of removal. If the heat-conducting paste layer is dirty or hardened, purchase fresh paste from your Mercedes-Benz dealer and replace it.
Coolant temperature sensor
Typically, the ignition system and fuel injection system share one common coolant temperature sensor. See subsections 9.10.1, 10.13.5.
Original material on the website [MercedesMAN]
Throttle position switch
The ignition system and fuel injection system are controlled by one common switch for extreme throttle positions. The throttle position switch can only be removed when the throttle body is removed. The switch must be installed at a service station only.
Engine Air Intake Temperature Sensor
Removal
1. The temperature sensor for the air entering the engine is installed on the side of the air filter housing.
2. Make sure the ignition is off, then disconnect the electrical connector from the sensor.
3. Turn the sensor a quarter turn and remove it from the air cleaner housing. Remove the gasket.
Installation
1. Installation is carried out in the reverse order of removal.
Top Dead Center Sensor
The TDC sensor is mounted on a bracket above the vibration damper on the front side of the engine. The position of the TDC sensor is very important for setting the ignition timing, so the TDC sensor must be replaced at a service station.