With CONSULT-II

WARNING: This page is about a different car, the 2004 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
Check "COOLAN TEMP/S" in "DATA MONITOR" mode with CONSULT-II.
Confirm "COOLAN TEMP/S" value is within the range listed below.
1. COOLAN TEMP/S: Less than 40°C (104°F)
If the value is out of range, park the vehicle in a cool place and allow the engine temperature to stabilize. Do not attempt to lower the engine coolant temperature with a fan or means other than ambient air. Doing so may produce an inaccurate diagnostic result.

Fig 1: Displaying Data Monitor Screen
Courtesy of NISSAN MOTOR CO., U.S.A.
Start engine and let it idle monitoring "COOLAN TEMP/S" value. When the "COOLAN TEMP/S" value reaches 70°C (158°F), immediately go to the next step.
Select "EGR SYSTEM P0400" of "EGR SYSTEM" in "DTC WORK SUPPORT" mode with CONSULT-II.
Touch "START".
Accelerate vehicle to a speed of 40 km/h (25 MPH) once and then stop vehicle with engine running.
If "COMPLETED" appears on CONSULT-II screen, go to step 8.

If "COMPLETED" does not appear on CONSULT-II screen, go to the following step.
When the following conditions are met, "TESTING" will be displayed on the CONSULT-II screen. Maintain the conditions until "TESTING" changes to "COMPLETED". (It will take approximately 30 seconds or more.)

Fig 2: Checking Reference Chart
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 3: Displaying Out Of Condition Screen
Courtesy of NISSAN MOTOR CO., U.S.A.

If "TESTING" is not displayed after 5 minutes, retry from step 2.
Make sure that "OK" is displayed after touching "SELF-DIAG RESULTS". If "NG" is displayed, refer to DIAGNOSTIC PROCEDURE .