DL5 - Induce DTC 327

Diagnostic Trouble Code (DTC) 337 indicates the Pressure Feedback EGR (PFE) / Differential Pressure Feedback EGR (DPFE) sensor signal is greater than the Self-Test maximum value of 4.8 volts.

Possible causes are:

- Damaged PFE/DPFE sensor.

- Shorted harness circuits.

- Open SIG RTN circuit.

- Damaged Powertrain Control Module (PCM).

- Key "OFF".

- Disconnect PFE/DPFE sensor.

- Rerun Key On Engine Off (KOEO) Self Test.

- Is DTC 327 present (ignore all other DTC's)?

Yes -- Go to DL6. DL6 - Measure VREF Circuit Voltage at PFE/DPFE Sensor

No -- Go to DL7. DL7 - Check PFE/DPFE Circuit For Short to Power