Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Mercedes Benz >> 2011 >> ML63 >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (EGR Function Testing - Diesel MERCEDES-BENZ) >> Test 2 >> Diesel

Test 2: Diesel

WARNING: This page does not describe the selected car, but rather 83 other vehicles, including the 2015 Mercedes-Benz Sprinter 3500, 2015 Mercedes-Benz Sprinter 2500, 2015 Mercedes-Benz ML250, 2015 Mercedes-Benz GLK250, and 2015 Mercedes-Benz GL350. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect Vacuum Tester (201 589 13 21 00) with "Y" fitting to EGR valve. With engine idling at 850-900 RPM with about 900 mbar vacuum, briefly apply full throttle. If vacuum decreases, go to next step. If vacuum does not decrease, go to step  3.
  2. Connect vacuum tester directly to EGR valve. Turn engine off. Apply 300 mbar vacuum to EGR valve. Pull of vacuum line. EGR should close audibly. If EGR closes audibly, EGR is functioning properly. If EGR valve does not close audibly, replace EGR valve.
  3. Repair or replace EGR valve vacuum transducer as necessary. Mechanically check airflow sensor, vacuum line connections, and EGR valve microswitch. Check Electronic Diesel System (EDS) control unit connector and coolant temperature sensor. Repair as necessary.
scientia non olet · About Mike's Workshop Manuals