Chart 6EC-2 EGR System Check

Chart 6EC-2: Part 1 Of 2:

Chart 6EC-2: Part 2 Of 2:

PCM Circuit:

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

VACUUM TEST
1. Connect a vacuum gauge to the source side or 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 gauge to the EGR valve vacuum supply. There should be no vacuum with the engine idling. If there is, refer to the diagnostic charts in the accompanying images.

3. With the gauge 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.

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.

3. With engine idling, EGR solenoid should be energized. Voltmeter across EGR solenoid terminals should be greater than 10 volts.

4. Checking for Powertrain Control Module (PCM)'s ability to turn solenoid "OFF."