Contents: Crankshaft speed sensor ↡ Coolant temperature sensor ↡ Electronic control unit ↡ Electromagnetic drive ↡
Crankshaft speed sensor
Removal
1. Disconnect the negative battery terminal.
2. Disconnect the crankshaft sensor wires from the harness at the connector located in the engine compartment behind the battery.
3. The sensor is located on the mating surface between the cylinder block and the transmission bell housing above the starter hole. Loosen and remove the bolt, then remove the sensor from the transmission housing. If present, remove the gasket.
Installation
4. Install the crankshaft sensor in the reverse order of removal. Before screwing it into the gearbox housing, make sure that the bushing (if it is provided) installed on the sensor probe.
Coolant temperature sensor
Removal
5. Contact chapter 1 and partially drain the cooling system. Make sure the ignition key is off.
6. The coolant temperature sensor is screwed into the top wall of the cylinder head on the left side of the engine. Do not confuse it with the temperature gauge sensor.
7. Disconnect the sensor wire from the connector.
8. Unscrew the sensor from the cylinder head and remove the sealing ring.
Original material on the website: MercedesMAN
Installation
9. Installation is performed in the reverse order of removal. When finished, add liquid to the cooling system.
Electronic control unit
Removal
10. The Electronic Lever Control (ELR) unit is located in the rear of the engine compartment behind a false panel.
11. Disconnect the negative battery terminal
12. Disconnect the control unit wires from the multi-pin connector.
13. Loosen the mounting screws and remove the unit from the partition.
Installation
14. Installation is carried out in the reverse order of removal.
Electromagnetic drive
Removal
15. The Electronic Speed Regulator (ELR) actuator is bolted to the rear of the fuel injection pump housing. If the vehicle is equipped with both Electronic Speed Regulator (ELR) and Automatic Ramp Action (ARA), the upper of the two actuators will be the ELR actuator (see fig. 12.15).
Fig. 12.15. Rear part of the high-pressure fuel pump (side view)
And the electromagnetic drive of the ELR system
In the electromagnetic drive of the ARA system
16. Disconnect the negative battery terminal.
17. On non-turbocharged engines, refer to paragraph 2 and remove the air cleaner assembly.
18. Disconnect the drive wires at the connector.
19. Loosen and remove the two screws at the rear of the drive. Remove the corresponding brackets.
20. Remove the drive housing, sealing ring, adjusting shim and intermediate plate (if they are provided).
Installation
21. Installation is carried out in the reverse order of removal. Please note the following points.
- a) Transfer the adjusting shims to the new drive if the unit is to be replaced with a new one.
- b) Replace the sealing ring.
- c) Make sure that the electrical connector faces upward after installing the drive.