DL91 - All Continuous Memory EGR DTCs: Visual Inspection

- Key "OFF".

- Conduct a thorough visual inspection of the Pressure Feedback EGR (PFE) / Differential Pressure Feedback EGR (DPFE) system for any potential failures. Use the following check list for possible causes:

- Obvious physical damage.

- Loose connectors.

- Pushed out connector pins.

- Corroded connector contacts.

- Damaged wiring insulation.

- Incorrect harness routing.

- Incorrect component mounting.

- Road salt or rust accumulation.

- Damaged vacuum hoses.

- Incorrect vacuum hose routing.

- EGR Vacuum Regulator (EVR) solenoid filter contamination.

- Vacuum hose restriction.

- Road splash or icing.

- Incorrect service parts.

- Does the EGR system visual inspection reveal a potential failure?

Yes -- Service fault as necessary. Clear continuous memory. Clearing Diagnostic Trouble Codes

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

No -- Reconnect all components. Go to DL92. DL92 - All Continuous Memory EGR DTCs: Code Definitions