DTC P0400

DTC P0400  : EGR System Leak Detected

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 , then do the repair verification.

2. Problem verification

   -1. Start the engine. Hold the engine speed at 3000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.

   -2. Test-drive 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) for 5 minutes or more
   • Maintain then vehicle speed at 26 mph (41 km/h) and the engine speed between 1500-3000 RPM for 10 seconds or more with cruise control set

   Signal	Current conditions
   	Values	Unit
   ECT SENSOR 1
   VEHICLE SPEED
   ENGINE SPEED

   -3. 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 

   Replace the EGR valve , then do the repair verification.

   NO 

   If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for leakage between the EGR pipe and the EGR valve. If the HDS indicates NOT COMPLETED, go to step 2-2 and recheck.

3. Repair verification (OBD STATUS check)

   -1. Turn the vehicle to the ON mode.

   -2. Reset the PCM with the HDS .

   Reset PCM

   -3. Do the PCM idle learn procedure .

   -4. Test-drive 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) for 5 minutes or more
   • Maintain then vehicle speed at 26 mph (41 km/h) and the engine speed between 1500-3000 RPM for 10 seconds or more with cruise control set

   Signal	Current conditions
   	Values	Unit
   ECT SENSOR 1
   VEHICLE SPEED
   ENGINE SPEED

   -5. Monitor the OBD STATUS for DTC P0400 in the DTCs MENU with the HDS.

   DTC Description	OBD STATUS
   P0400 EGR System Leak Detected

   DTC (PGM-FI)

   Does the HDS indicate PASSED, FAILED, or NOT COMPLETED?

   PASSED

   Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated, go to the indicated DTC's troubleshooting.

   FAILED

   Go to step 1 and recheck.

   NOT COMPLETED

   Check the OBD STATUS again.