Abstract: A position diagnostic test for a shift-by-wire system is provided. The shift-by-wire system includes a shift lever configured to move along a shift path, a first and a second position sensor configured to generate a first and a second position signal, respectively, of the shift lever along the shift path, and a controller configured to receive the first and second position signals. The first position sensor includes a first x-coordinate value and a first y-coordinate value, and the second position sensor includes a second x-coordinate value and a second y-coordinate value. The position diagnostic test includes performing a rationality test on each of the coordinate values. If at least one predetermined condition exists for a particular coordinate value, then it fails the rationality test, and the position signal containing the coordinate value may be disregarded.

Abstract: A method for determining a transmission range selection of a shift-by-wire system, which includes a shift lever, a park button, and a controller, is provided. The shift lever is movable between a plurality of transmission range positions, each corresponding to a transmission range, and a null position. The park button is switchable between a pressed position corresponding to a Park transmission range, and a released position. The method includes determining, by the controller, if at least one predetermined condition exists. If it does, then the controller determines the transmission range selection to be the Park transmission range. Otherwise, the controller determines the transmission range selection to be the transmission range corresponding to the transmission range position in which the shift lever is positioned.

Abstract: A position diagnostic test for a shift-by-wire system is provided. The shift-by-wire system includes a shift lever configured to move along a shift path, a first and a second position sensor configured to generate a first and a second position signal, respectively, of the shift lever along the shift path, and a controller configured to receive the first and second position signals. The first position sensor includes a first x-coordinate value and a first y-coordinate value, and the second position sensor includes a second x-coordinate value and a second y-coordinate value. The position diagnostic test includes performing a rationality test on each of the coordinate values. If at least one predetermined condition exists for a particular coordinate value, then it fails the rationality test, and the position signal containing the coordinate value may be disregarded.

Abstract: A method for determining a transmission range selection of a shift-by-wire system, which includes a shift lever, a park button, and a controller, is provided. The shift lever is movable between a plurality of transmission range positions, each corresponding to a transmission range, and a null position. The park button is switchable between a pressed position corresponding to a Park transmission range, and a released position. The method includes determining, by the controller, if at least one predetermined condition exists. If it does, then the controller determines the transmission range selection to be the Park transmission range. Otherwise, the controller determines the transmission range selection to be the transmission range corresponding to the transmission range position in which the shift lever is positioned.