EGR Valve: Testing and Inspection

Chart 6EC-2: Part 1 Of 2:

EGR System Check: Part 2 Of 2:

Exhaust Gas Recirculation Circuit Diagram:

CIRCUIT DESCRIPTION
This procedure tests the EGR system's ability to functionally regulate the amount of exhaust gas fed to the engine.

NOTES ON FAULT TREE
1. Checking for EGR gases to enter the intake manifold by raising the EGR valve off of its seat.

2. Checking for EGR solenoid able to pass vacuum.

VACUUM TEST
1. Connect a vacuum gage to the source side of the EGR solenoid. Start the engine, manifold vacuum should be present. If it is not, repair leaks or obstruction between the EGR solenoid and throttle body.

2. Connect a vacuum gage to the EGR valve vacuum supply. There should be no vacuum with the engine idling. If there is, follow chart on the following page.

3. With the gage hooked to the EGR valve vacuum supply, disconnect the EGR solenoid connector. There should be more than 15 inches of vacuum available. If not, repair leak or obstruction in EGR valve vacuum hose.