2009 Subaru Impreza Owner's Manual - Page 251

Starting and operating 7-31 & SI-DRIVE selector When you rotate the SI-DRIVE selector to the left, the current SI-DRIVE mode changes to Sport (S) mode. When you rotate it to the right, the mode changes to Sport Sharp (S#) mode, and when you push it, the mode changes to Intelligent (I) mode. After performing this operation, the switch returns to its original location. the same mode as when the engine was turned off. . While the engine is running, if the CHECK ENGINE warning light/malfunction indicator lamp illuminates, the SIDRIVE mode changes to the Sport (S) mode. In this case, it is not possible to change to the Sport Sharp (S#) mode or Intelligent (I) mode. . If there is a possibility that the engine could overheat because of a temperature increase of the engine coolant, it is not possible to change to the Sport Sharp (S#) mode. While the vehicle is in the Sport Sharp (S#) mode, it changes to the Sport (S) mode when the engine coolant temperature increases. . If any of the SI-DRIVE indicators blink, the SI-DRIVE system may be malfunctioning. Contact your SUBARU dealer. Limited slip differential (LSD) (WRX STI) The LSD provides optimum distribution of power according to the difference in revolutions between the right and left wheels that may be caused by certain driving conditions, thereby improving driving stability on snow-covered, muddy or other slippery roads or when high speed driving. CAUTION . Never start the engine while a tire on one side is jacked up, as the vehicle may move. . If one tire is spinning in mud, avoid continued spinning at high speed as this could adversely affect the LSD. . If you use a temporary spare tire to replace a flat tire, be sure to use the original temporary spare tire stored in the vehicle. Using other sizes will adversely affect the LSD. NOTE . The next time you turn on the engine, after you turned off the engine in the Sport Sharp (S#) mode, the SIDRIVE mode changes to the Sport (S) mode. . The next time you turn on the engine, after you turned off the engine in the Sport (S) mode or Intelligent (I) mode, the SI-DRIVE mode will stay in