Diagnostic system for a motor vehicle
First Claim
1. A diagnositc system for a motor vehicle that is equipped with several control systems assigned to functional systems of the motor vehicle, such as an electric fuel injection system and an antilock brake system, said control systems being equipped with a self-monitoring means and a nonvolatile memory having a defined storage area for defect reports;
- said diagnostic system comprising;
a testing unit for initializing communication with individual control systems and requesting defect reports;
a two line serial bus system in said vehicle for connecting said testing unit and said control system and including a unidirectional stimulating line for initializing a serial communication with individual control system and a communication line for transferring serial digital information between the individual control systems and the testing unit;
display means in said vehicle connected to a combination instrument for displaying operational informaiton and connected to said testing unit for displaying said requested defect reports; and
activation means for activating said testing unit and changing the combination instrument with the test unit and the display system into a diagnostic mode to initiate communication and display defect reports.
1 Assignment
0 Petitions
Accused Products
Abstract
A diagnostic system including a display system in a combination instrument of the motor vehicle and a testing unit connected by a stimulating line (L) and a communication line (K) serial bus system to control systems for selectively reading defect reports from the defined storage areas of the control systems and displaying them on the display system. A diagnostic system is started by plugging a diagnostic plug or an external testing unit into a plug device connected with the testing unit or the bus system.
-
Citations
19 Claims
-
1. A diagnositc system for a motor vehicle that is equipped with several control systems assigned to functional systems of the motor vehicle, such as an electric fuel injection system and an antilock brake system, said control systems being equipped with a self-monitoring means and a nonvolatile memory having a defined storage area for defect reports;
- said diagnostic system comprising;
a testing unit for initializing communication with individual control systems and requesting defect reports; a two line serial bus system in said vehicle for connecting said testing unit and said control system and including a unidirectional stimulating line for initializing a serial communication with individual control system and a communication line for transferring serial digital information between the individual control systems and the testing unit; display means in said vehicle connected to a combination instrument for displaying operational informaiton and connected to said testing unit for displaying said requested defect reports; and activation means for activating said testing unit and changing the combination instrument with the test unit and the display system into a diagnostic mode to initiate communication and display defect reports. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- said diagnostic system comprising;
Specification