Contents: Electronic control unit ↡ Overload protection relay ↡ Crankshaft speed sensor ↡ Coolant Temperature Sensor ↡ Electromagnetic drive of the ELR…↡ ELR system electromagnetic vacuum…↡ Air flow meter ↡ Incoming air temperature sensor ↡
Electronic control unit
Removal
1. The electronic control unit for the diesel engine management system (EDS) is located in the rear of the engine compartment behind the bulkhead panel.
2. Disconnect the negative battery terminal.
3. Disconnect the control unit wires from the multi-pin connector.
4. Remove the mounting screws and remove the unit from the partition.
Installation
5. Installation is carried out in the reverse order of removal.
Overload protection relay
Removal
6. The relay is mounted in the base unit, next to the EDS microprocessor - refer to the previous subsection. It contains fuses and diodes that protect the EDS system from current overload and power surges.
7. Disconnect the negative battery terminal.
8. Carefully remove the relay from the board.
Installation
9. Installation is carried out in the reverse order of removal.
Crankshaft speed sensor
10. Refer to the information provided for the electronic idle speed control system in paragraph 12.
Coolant Temperature Sensor
11. Refer to the information provided for the electronic idle speed control system in paragraph 12.
Electromagnetic drive of the ELR system
12. Refer to the information provided for the electronic idle speed control system in paragraph 12.
ELR system electromagnetic vacuum valve
13. Refer to the information provided in chapter 4G.
Air flow meter
Removal
14. Disconnect the negative battery terminal. Remove the air cleaner assembly as described in paragraph 2.
Article based on data from the website: mercedesman
15. Unscrew the air cleaner bracket from the air flow meter housing.
16. Loosen the clamps and disconnect the elbow of the intake manifold and the manifold on each side of the air flow meter. Remove the O-rings.
17. Disconnect the drive wiring from the connector.
18. Loosen the mounting bolts and nuts and remove the air flow meter from the support bracket.
Caution: Handle the air flow meter with care - it is a sensitive instrument.
Installation
19. Installation is carried out in the reverse order of removal.
Incoming air temperature sensor
20. The incoming air temperature sensor is built into the air flow meter - refer to the previous subsection.