P0400

P0400-EGR SYSTEM FLOW MALFUNCTION





For a complete wiring diagram refer to the Wiring Information Electrical Diagrams.

Theory of Operation
This diagnostic monitors EGR position when it is commanded closed.
- When Monitored:
Engine running, EGR valve commanded closed.

- Set Condition:
Detected EGR position is greater than 6% for more than two seconds.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure
ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, record all Freeze frame data.
3. With the scan tool, erase DTCs.
4. Turn the ignition off for 30 seconds.
5. Start the vehicle and let idle.
6. With the scan tool, read DTCs.

Did the DTC reset?

Yes

- Replace EGR valve.
- Perform POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Refer to the INTERMITTENT CONDITION - DIESEL (Diagnostic Procedure). Intermittent Condition Test