DL27 - Check PFE and SIG RTN Harness Circuit Continuity
- Key "OFF".
- Breakout box connected, Powertrain Control Module (PCM) disconnected.
- Pressure Feedback EGR (PFE) sensor disconnected.
- Measure resistance between PFE circuit at the sensor vehicle harness connector and test pin 27 at the breakout box.
- Measure resistance between PFE SIG RTN circuit at the sensor vehicle harness connector and test pin 46 at the breakout box.
- Is each resistance less than 5.0 ohms?
Yes -- Go to DL28. DL28 - Check PFE Harness Circuit For Shorts to Power
No -- Service open circuit(s). Remove breakout box. Reconnect all components. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)