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