Exhaust Gas RECIRCULATION System
Observe the following for all installations, especially in engine compartment due to lack of room:
- Route lines of all types (e.g. for fuel, hydraulic, coolant and refrigerant, brake fluid, vacuum) and electrical wiring so that the original path is followed.
- Watch for sufficient clearance to all moving or hot components.
Function
Activation of Exhaust Gas Recirculation (EGR) system is performed by Engine Control Module (ECM) -J623- and Engine Control Module 2 -J624- via EGR Vacuum Regulator Solenoid Valve -N18- and Valve 2 for EGR -N213- to mechanical EGR valves.
The mechanical EGR valve with cone-shaped valve plunger makes different opening diameters possible at different valve lifts. Every relevant valve position is possible via cyclic activation.
Always replace self-locking nuts.
Components depicted here correspond to cylinder bank 2. They are different only as a mirror image of components for cylinder bank 1.
Engine Control Modules (ECM) are equipped with On-Board Diagnostics (OBD).
Components marked with * are tested via On Board Diagnostic (OBD) DIAGNOSTIC MODE 03 - READ DTC MEMORY
Vacuum Hoses, Connection Diagram
Cylinder bank 1 is located in direction of travel, right.
Cylinder bank 2 is located in direction of travel, left.
- EGR Vacuum Regulator Solenoid Valve -N18- *
- for cylinder bank 1
- checking EXHAUST GAS RECIRCULATION VACUUM REGULATOR SOLENOID VALVE, CHECKING
- EGR Vacuum Regulator Solenoid Valve
- for cylinder bank 1
- Checking mechanically EXHAUST GAS RECIRCULATION VALVE, CHECKING
- EGR Vacuum Regulator Solenoid Valve
- for cylinder bank 2
- Checking mechanically EXHAUST GAS RECIRCULATION VALVE, CHECKING
- Valve 2 for EGR -N213- *
- for cylinder bank 2
- checking EXHAUST GAS RECIRCULATION VACUUM REGULATOR SOLENOID VALVE, CHECKING
- Filter
- Vacuum connection
- Between tandem pump and brake booster
- Tandem pump
- For fuel- and vacuum supply