EGR Control Vacuum Test

Checking Condition

Engine coolant temperature: 80 - 95°C (176-205°F)





1. Disconnect the vacuum hose from the throttle body EGR vacuum fitting and connect a vacuum gauge to the fitting.





2. Start the engine and check that, after raising the engine speed, vacuum raises proportionately with the rise in engine speed.

NOTE: If vacuum does not increase, it is possible that the throttle body port may be clogged and require cleaning.