Exhaust Gas Recirculation: Testing and Inspection

The engine control module contains memories for the ideal exhaust gas recirculation valve lift for various engine operating conditions. The valve lift sensor detects the amount of exhaust gas recirculation valve lift and relays this information to the engine control module. The engine control module then compresses this information with the ideal determined by signals from various sensors. If a significant difference exist between the two, the engine control module stops current to the solenoid valve, there by reducing vacuum applied to the exhaust gas recirculation valve.

If the exhaust gas recirculation system malfunctions, a failure code will be set in the engine control module memory and the warning lamp on the instrument panel will be illuminated.

PROCEDURE
1. Place ignition switch in Off position.
2. Disconnect six pin connector from exhaust gas recirculation valve.
3. Connect a jumper wire between battery positive terminal and exhaust gas recirculation valve 6 pin connector terminal No. 6.
4. Start the engine allow to idle.
5. Connect a jumper wire between battery negative terminal and exhaust gas recirculation valve 6 pin connector terminal No. 4.
6. The engine should idle roughly or stall.