DTC P0400

DTC P0400  : EGR System Leak Detected

NOTE:  Before you troubleshoot, review the general troubleshooting information .

DTC (PGM-FI)

1. EGR pipe visual check

   -1. Check for a loose or damaged EGR pipe.

   Is the EGR pipe OK?

   YES 

   Go to step 2.

   NO 

   Reconnect or replace the EGR pipe .

2. Problem verification

   -1. Enter the maintenance mode, then start the engine .

   -2. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

   Test-drive the vehicle under these conditions:

   • Engine coolant temperature (ECT SENSOR 1) above 158 deg.F (70 deg.C)
   • Transmission in D
   • Drive the vehicle at 25 mph (40 km/h) or less for 5 minutes
   • Maintain the vehicle speed at 50 mph (80 km/h) or more and the engine speed between 1, 750-3, 000 rpm for at least 10 seconds

   Signal	Current conditions
   	Values	Unit
   ECT Sensor 1
   Vehicle Speed
   Engine Speed

   -4. Monitor the OBD STATUS for DTC P0400 in the DTCs MENU with the HDS.

   DTC Description	OBD STATUS
   P0400 EGR System Leak Detected

   Does the HDS indicate FAILED?

   YES 

   The failure is duplicated. Replace the EGR valve .

   NO 

   If the HDS indicates PASSED, there is an intermittent failure and the system is OK at this time. Check for leakage between the EGR pipe and the EGR valve. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot . If the HDS indicates NOT COMPLETED, go to step 2-3 and recheck.