Exhaust Gas Recirculation: Testing and Inspection

1. Disconnect the vacuum hose (green stripe) from the EGR valve body, and connect a vacuum pump via the three way terminal.
2. Check the following points when the engine is both cold (engine coolant temperature 20°C [68°F] or below) and warm (engine coolant temperature 80°C [176°F)] or higher).





[When the engine is cold]





[When the engine is warm]





3. Disconnect the three-way terminal and connect the hand vacuum pump directly to the Exhaust Gas Recirculation (EGR) valve.
4. Check whether the engine stalls or the idling is unstable when a vacuum of 27 kPa (7.9 in. Hg) or higher is applied during idling.