DN1 - Attempt to Generate DTC 337

Diagnostic Trouble Code (DTC) 327 indicates the EGR Valve Position (EVP) sensor signal is less than the Self-Test minimum value of 0.2 volt.

NOTE: Because the EVP sensor is preloaded when attached to the EGR valve, a failure in the EGR valve causing the EVP sensor to lose preload may also set DTC 327.

Possible causes:

- Damaged EVP sensor.

- Damaged EGR valve.

- Open harness.

- Grounded harness.

- Damaged Powertrain Control Module (PCM).

- Key "OFF".

- Disconnect EVP sensor.

- Jumper VREF circuit to EVP circuit at the EVP sensor vehicle harness connector.

- Rerun Key On Engine Off (KOEO) and Key On Engine Running (KOER) Self-Test. Quick Test Appendix (Detailed Testing Instructions)

NOTE: If no DTCs are generated, immediately remove jumper and go directly to DN4. DN4 - Check EVP Circuit For Short to Ground

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

Yes -- Replace EVP sensor. Remove jumper. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

No -- Remove jumper. Go to DN2. DN2 - Check VREF Circuit Voltage