Diagnostic procedure

Make sure that the engine coolant temperature is less than 30°C (86°F).
Drive according to the drive pattern described below.

Fig 1: Screen Display - EGR Solenoid Valve Drive Pattern (Drive Cycle F)
Courtesy of SUBARU OF AMERICA, INC.

NOTE:

There is no given transition time between idling and cruising.
Driving at constant speed only on a downhill causes smaller engine load and may result in failure to obtain a right diagnostic result.
When the engine stops while performing drive cycle F, perform it again from the state of procedure 1).