System Test

Testing The EGR System, First Test:

1. Disconnect the vacuum hose (green strip) from the EGR valve and connect a manual vacuum pump to the three way terminal.
2. While the engine is cold (coolant temperature less than 60 degrees C or 140 degrees F) verify that when suddenly accelerating the engine from idle, there is no vacuum present.
3. Allow the engine to warm up (coolant temperature greater than 70 degrees C or 158 degrees F) and verify that when suddenly accelerating the engine from idle, vacuum rises temporarily to 14 kPa (3.9 in.Hg) or more.

Testing The EGR System, Second Test:

4. Disconnect the three-way terminal and connect the hand vacuum pump directly to the exhaust gas recirculation (EGR) valve.
5. Check whether the engine stalls or the idle becomes unstable when a vacuum of 20 kPa (5.9 in.Hg) or higher is applied.