DL109 - Check For Obstructed EGR Passage

- Key "OFF".

- On some engines (high mileage in particular), it is possible for the intake manifold EGR port to get intermittently obstructed by sludge.

- Inspect the EGR port in the intake manifold if sludging is suspect (in some cases, it may require the removal of the intake manifold).

- Is there excessive sludging in the intake manifold?

Yes -- Clean and service as necessary. Reconnect all components. Clear continuous memory.

Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

No -- Unable to duplicate and/or identify fault at this time. In cold climates, icing in the EGR system may occur. The EGR function returns to normal when the engine warms up .

For further diagnosis using the EEC-IV monitor box or Scan Tool, refer to Intermittent Diagnosis.

All others, clear continuous memory.

Rerun Quick Test. Quick Test Appendix (Detailed Testing Instructions)