Crankshaft speed sensor
Removing
1. Remove the ground wire 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 made in sequence, return to removal. Install a new gasket before installing the crankshaft speed sensor.
Electronic control device
Removing
Location of the electronic ignition control on models with the TSZ ignition system
1. The electronic ignition control is located on the left side of the engine compartment on top of the wheel arch (see picture).
2. Remove the ground wire from the battery.
3. Tag and disconnect the single pin electrical connectors of the electronic ignition control monitor.
4. Disconnect the intake manifold vacuum hose from the control unit and close the hole with a plug.
5. Unscrew the nuts and remove the electronic control device from the engine compartment.
Attention! To improve heat removal from the electronic control device, its lower surface is covered with a special heat-conducting paste.
Installation
1. Installation is made in sequence, return to removal. If the thermal 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 the fuel injection system have one common coolant temperature sensor. See subsections 9.10.1, 10.13.5.
Throttle limit switch
The ignition system and the fuel injection system are controlled by one common throttle limit switch. The throttle position switch can only be removed with the throttle body removed. The switch must only be installed at a service station.
Intake air temperature sensor
Removing
1. The air intake temperature sensor is located on the side of the air filter housing.
2. Check that the ignition is off, then disconnect the electrical connector from the sensor.
3. Turn the sensor a quarter of a turn and remove it from the air filter housing. Remove the gasket.
Installation
1. Installation is made in sequence, return to 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 top dead center sensor is very important for setting the ignition timing, so the replacement of the top dead center sensor must be done at a service station.