VORRICHTUNG UND VERFAHREN ZUR FEHLERBESTIMMUNG IN EINEM STUFENLOSEN GETRIEBE

摘要

An ECU executes a program including the steps of determining that a change speed solenoid is abnormal (step S106) when a target speed ratio falls within a predetermined range (YES in S100), an upshift is recognized (YES in S102) and the change speed solenoid is abnormal (YES in S104); determining that the change speed solenoid is normal (S108) when the change speed solenoid is not abnormal (NO in S104); determining that a belt pinch pressure solenoid is abnormal (S114) when the target speed ratio is substantially equal to a speed ratio ³min on a maximum speed-increase side (YES in S110) and the target speed ratio is not substantially equal to an actual speed ratio (NO in S112); and determining that the belt pinch pressure solenoid is normal when the target speed ratio is substantially equal to the actual speed ratio.