DL4 - Check PFE/DPFE Circuit For Shorts to Ground and SIG RTN

- Key "OFF".

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

- Breakout box installed, Powertrain Control Module (PCM) disconnected.

- Measure resistance between test pin 27 and test pins 40, 46 and 60 at the breakout box.

- Is each resistance greater than 10,000 ohms?

Yes -- Replace PCM. Remove breakout box. Reconnect all components. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

No -- Service short circuit. Remove breakout box. Reconnect all components. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)