Vacuum Check

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 hand vacuum pump to the fitting.





2. Scan the engine and check to see that, after increasing the engine speed, vacuum raises proportionately to engine speed.

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