EGR Valve Control Vacuum Check

Check Condition
Engine coolant temperature: 80 - 95°C (176 - 203°F)





(1) Disconnect the vacuum hose from the throttle body EGR vacuum nipple and connect a hand vacuum pump to the nipple.





(2) Start the engine and check to see that, after raising the engine speed by racing the engine, vacuum remains fairly constant.

NOTE: If there is a problem with the change in vacuum, it is possible that the throttle body port may be clogged and require cleaning.