EGR Valve Vacuum Check
EGR VALVE VACUUM CHECKChecking 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.
Purge Port Vacuum Curve:
2. Start 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.