Patent ID: 6317698
Filing Date: 2001-11-13
Classification: B60K,B60W,F16H,Y10T

Abstract:
A method for detecting faults in a position sensing device of a transfer case shift motor in an electronic shift system in a motor vehicle having a controller for operating the motor; the method comprising the steps of:determining a first value of the sensing device, the first value corresponding to a preselected transfer case position;determining that the motor is not energized by the controller;determining that a first predetermined time period has elapsed since the motor was de-energized after a shift-attempt;determining that a second predetermined time period has elapsed since the controller was initialized;determining a current value of the sensing device;determining the current value of the sensing device is not the same as the first value; andupon all of the above determinations being made, setting a first fault flag corresponding to an unwarranted sensing device change fault, otherwise not setting said first fault flag.