Vacuum Control

Connect Vacuum Tester (116 589 25 21 00) with "Y" fitting to EGR valve. Check vacuum values and position of vacuum control flap. Vacuum values are: At 750 RPM, 0 in. vacuum; At 1200 RPM, 4-9 in. vacuum; At 3000 RPM, 0 in. vacuum. If vacuum test values are okay, go to next test. If vacuum test values are not okay, check vacuum supply and individual components.