Exhaust Gas Recirculation: Testing and Inspection

EGR Solenoid:

1. Disconnect the vacuum hose (green stripe) from the EGR solenoid, and then connect a hand vacuum pump via the three-way terminal.
2. Regarding the engine in cold and hot conditions, check the condition of vacuum when a rapid racing has been performed by opening the throttle valve quickly.

When engine is cold [Engine coolant temperature: 20° C (68° F) or less]

Throttle valve Normal vacuum condition

Open quickly No vacuum will generate
(remained as barometric pressure).


When engine is hot [Engine coolant temperature: 80° C (176° F) or higher]

Throttle valve Normal vacuum condition

Open quickly It will momentarily rise over 13 kPa (3.9 in.Hg)

3. Disconnect the three-way terminal.
4. Connect the hand vacuum pump directly to the EGR valve.
5. 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.