EGR Valve: Testing and Inspection

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




Procedure
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.