Checking the EGR Airflow Control Valve

CHECKING THE EGR AIRFLOW CONTROL VALVE





For a complete wiring diagram Refer to the Wiring Information Electrical Diagrams Electrical Diagrams





EGR AIRFLOW CONTROL VALVE
1. Disconnect the hose/tube on the inlet side of the EGR Airflow Control Valve.
2. Use a mirror to observe the throttle plate position inside the EGR Airflow Control Valve for the following steps
3. With the scan tool, actuate the EGR Airflow Control Valve at 0%, 40% and 100% while observing the throttle plate position.

NOTE: The EGR actuation will only occur for 30 seconds then actuation will stop automatically. Any readings, observations or measurements must be completed within 30 seconds of beginning of actuation.

NOTE: The throttle plate position should be wide open at 0% actuation, midway between open and closed at 40% actuation and completely closed at 100% actuation.

Does the throttle plate move smoothly, without binding, to the correct position based on actuation percentage described in the note above?

Yes

- EGR system operating correctly. Test Complete.

No

- Check the wiring and connectors between the EGR Airflow Control Valve and the ECM for proper connection and resistance. Repair as necessary. If wiring and connections are o.k., replace the EGR Airflow Control Valve.
- Perform the ECM Verification Test.Verification Tests