DL36 - Measure VREF Circuit Voltage

- Key "OFF".

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

- Key "ON", engine "OFF".

- Measure voltage between VREF circuit and SIG RTN circuit at the PFE/DPFE sensor vehicle harness connector.

- Is voltage between 4.0 and 6.0 volts?

Yes -- Go to DL37. DL37 - Check PFE/DPFE Harness Circuit Continuity

No -- Go to pinpoint test step C1. C1 - Check Vehicle Battery Power Circuit