Malfunction Threshold

When the vehicle speed measured by the input shaft (mainshaft) speed sensor [INPUT SHAFT (MAINSHAFT) SPEED] is 13 mph (20 km/h) or more, the vehicle speed measured by the output shaft (countershaft) speed sensor [OUTPUT SHAFT (COUNTERSHAFT) SPEED] is 1 mph (2 km/h) or less for at least 10 seconds.