2008 Subaru Impreza Owner's Manual - Page 241

Starting and operating 7-19 & To change mode of driver's control center differential & Auto mode 1) 2) 3) 4) A) B) LSD torque Traction torque Initial LSD torque (maximum) Initial LSD torque (minimum) Initial LSD torque (adjustable) Mechanical LSD torque NOTE If you rapidly depress and release the accelerator pedal while driving at low speed, you may hear a knocking sound from the vicinity of the center differential and rear differential. This sound occurs because of the structure of the center differential. It does not indicate a problem. The driver's control center differential has an auto mode that can automatically adjust the initial LSD torque and a manual mode that can change to the desired mode manually by pushing the "AUTOMANU" switch. In the auto mode, the system estimates the driving and road conditions using signals from the wheel speed sensor, throttle position sensor, steering angle sensor and brake switch, etc. According to the result, it electronically and automatically controls the degree of limitation of the differential action (LSD torque) to optimize the differential action of the center differential. When the ignition switch is turned ON, the "AUTO" indicator light in the combination meter illuminates. The system can be switched to a manual mode. - CONTINUED -