DL35 - Attempt to Generate KOEO Code 337

- Key "OFF".

- Disconnect Pressure Feedback EGR (PFE) / Differential Pressure Feedback EGR (DPFE) sensor.

- Jumper VREF circuit to PFE/DPFE circuit at the PFE/DPFE sensor vehicle harness connector.

- Perform Key On Engine Off (KOEO) Self-Test. Quick Test Appendix (Detailed Testing Instructions)

NOTE: If no Diagnostic Trouble Codes (DTC) are generated, immediately remove jumper and go directly to DL37. DL37 - Check PFE/DPFE Harness Circuit Continuity

- Is DTC 337 present (ignore all other DTCs)?

Yes -- Replace PFE/DPFE sensor. Remove jumper wire. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

No -- Remove jumper. Go to DL36. DL36 - Measure VREF Circuit Voltage