Engine Code 1Z

NOTES:
- Functional control of Exhaust Gas Recirculation (EGR) system is performed by Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248- via the EGR vacuum regulator solenoid valve -N18-.
- Check EGR vacuum regulator solenoid valve -N18- using Output Diagnostic Test Mode (DTM).
- The cone shaped plunger in the mechanical EGR valve enables various cross sectional openings at different plunger heights.
- Every conceivable valve position is possible via pulsed control.