Exhaust Gas Recirculation (EGR) system: Function

Activation of Exhaust Gas Recirculation (EGR) system occurs from Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248- via EGR Vacuum Regulator Solenoid Valve -N18- to EGR valve. The mechanical EGR valve with cone-shaped valve plunger makes different opening diameters possible at different valve lift. Every relevant valve position is possible via cyclic activation.

NOTE:

Always replace self-locking nuts.
Components marked with * are tested via On Board Diagnostic (OBD); see DIAGNOSTIC MODE 3: CHECK DTC MEMORY .