Exhaust Gas Recirculation: Testing and Inspection

1. Remove the EGR Pressure Transducer cap and filter.

INSPECT
Filter for contamination or damage.

CLEAN
Using compressed air, clean the filter.

2. Reinstall the filter and cap onto the EGR Pressure Transducer.

IMPORTANT:: Reinstall the filter with the coarser side facing outward.




3. Using a three-way connector, connect a vacuum gauge to the hose between the EGR valve and the EGR Pressure Transducer.
4. Check the seating of the EGR valve.
5. Starting the engine and making sure that it idles normally. If idle is rough and no other problems exist, replace EGR valve as necessary.
6. Connect a jumper between Data Link Connector (DLC) terminals TE1 and E1.
7. Make sure that the Engine Coolant Temperature (ECT) is below 47°C (11 7°F).
8. Accelerate the engine to 2,500 RPM and make sure that the vacuum gauge reads zero vacuum. If vacuum is present, refer to Exhaust Gas Recirculation (EGR) vacuum regulator solenoid Check. Replace EGR vacuum regulator solenoid valve as necessary.
9. Run the engine until ECT exceeds 5300 (127°F) and accelerate engine to 2,500 RPM and make sure that the vacuum gauge reads low vacuum. If no, or high vacuum is indicated, refer to Exhaust Gas Recirculation (EGR) vacuum regulator solenoid Check and Exhaust Gas Recirculation (EGR) Pressure Transducer Check. Replace EGR vacuum regulator solenoid and/or EGR Pressure Transducer as necessary.
10. Remove vacuum gauge and return vacuum hoses to their proper location.




11. Apply vacuum directly to the EGR valve using a vacuum pump. The engine should run rough or even stall. If engine runs and idles fine with vacuum applied here, replace the EGR valve.
12. Reconnect the vacuum hoses to their proper locations and remove jumper from DLC terminals.