Chrysler Corporation

John R Boldt

Robert L Barker

Daniel J Marus

Gregory J Broniak

Raymond J Williams

Krzysztof Gurne

Charles J Berra

William O Robinson

Samuel Campbell, Iii

Alan J Amici

Joseph J Krebs

Himshweta R Amin

Rajiv Saxena

The present invention relates to a system and method for diagnosing and isolating problems and for monitoring operting conditions on an automobile. The system includes a hand held unit and a master station which can operate alone or in unison to accomplish functions such as logging and displaying data on a real-time basis, logging data remotely and displaying the data at a later time, diagnosing fault conditions, monitoring operating parameters, reprogramming on-board vehicle controllers, displaying service manual and service bulletin pages and ordering parts on-line.

Automotive diagnostic service tool with hand held tool and master controller

A method of diagnosing a lock-up mechanism for a torque converter in an automatic transmission of an automotive vehicle includes the steps of sensing vehicle speed and engine speed, calculating a vehicle speed to engine speed ratio based on the sensed vehicle speed and engine speed, knowing when the torque converter transitions between unlock and lock are initiated, determining whether the calculated ratio is greater than a predetermined threshold when the torque converter transitions between unlock and lock, and concluding that a failure of the lock-up mechanism has occurred if the calculated ratio is not greater than the predetermined threshold within a predetermined time since transition of the torque converter.

Method for diagnosing a torque converter's lock-up mechanism

An adapter which permits the use of present diagnostic tools with newer ISO9141 equipped engine and transmission controllers. The adapter facilitates bi-directional communication while conditioning the signals entering and exiting the adapter and allow the diagnostic tools to operate transparent of the adapter's presence.

Circuit and method for interfacing vehicle controller and diagnostic

Hand held automotive diagnostic service tool

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Troy, MI, United States of America

John R Boldt