DR-23 Checking EGR System

This test must be performed with engine cold.

1. Disconnect vacuum hose from EGR valve and connect a vacuum gauge to it.
2. Start engine and raise engine speed to 2000 RPM.
3. If vacuum gauge shows a steady reading of 0, proceed to Test 24.
4. If vacuum gauge shows unsteady reading above 0, replace EGR solenoid.