An automatic transmission control system equipped with a shift lever position sensor which includes a plurality of switches which output binary signals following a shifting motion of a gear shift lever. Patterns of combinations of the switch outputs are preselected so as to represent positions to which the gear shift lever is manually shiftable. The switches are broken down into two groups each of which produces a binary code carrying information about the position of the gear shift lever to monitor a failure in operation of the shift lever position sensor. The control system also works to perform a deemed D-position hydraulic transmission control to ensure the running of the vehicle even if the shift lever position sensor is failing.
CROSS REFERENCE TO RELATED DOCUMENT
This application is a division of application Ser. No. 11/008,652, filed Dec. 10, 2004, which is in turn based on Japanese Patent Application Nos. 2003-412320, 2003-412321, and 2004-24932 filed on Dec. 10, 2003, Dec. 10, 2003, and Jan. 30, 2004, the disclosures of which are incorporated herein by reference.
Priority Data
Dec 10, 2003 [JP] 2003-412320 Dec 10, 2003 [JP] 2003-412321 Jan 30, 2004 [JP] 2004-024932
