Diagnostic system for control apparatus of a motor vehicle
First Claim
1. A diagnostic system for a plurality of control devices having decreasing priority of a motor vehicle, each equipped with a defect memory means and at least one self-diagnostic function means comprising:
- a defect lamp;
defect lamp line means connecting said control apparatus to each other and to said defect lamp;
data but means including initialization line means connecting said control devices;
each control device being responsive to a first distinctive signal on said initialization line means to read-out diagnostic data as a flashing code word on said defect lamp line means to flash said defect lamp, said flashing code word including a start flashing pulse followed by four flashing sequences of up to nine flashing pulses each separated by pauses, each of the four flashing sequences in their timed sequence representing distinctive data;
each control device being addressed sequentially in decreasing priority to read-out said diagnostic data of respective control device in a diagnostic sequence with decreasing priority, and being responsive to a second distinctive signal on said initialization line means to discontinue said read-out from a respective control apparatus and begin read-out from a lower priority control device.
1 Assignment
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Accused Products
Abstract
A diagnostic system for control apparatus of a motor vehicle equipped with self-diagnostic functions in which the control apparatus are connected with each other by way of a diagnostic bus and a defect lamp line. Diagnostic functions can be initiated by way of a key or momentary switch in an initialization line of the diagnostic bus whereby the diagnostic results can be read out at a defect lamp connected to the defect lamp line by way of flashing code word. The defect output thereby takes place strictly sequentially, defect-by-defect and control apparatus by control apparatus. In order to be able to discontinue at any time a diagnostic analysis of the control apparatus and to be able to continue to the diagnostic analysis of the next control apparatus, a newly defined special signal emission is applied to the initialization line. By an association of a certain information content to certain places of the flashing code and by a new testing apparatus, the diagnostic analysis, the defect recognition and the coordination of the defects to predetermined control apparatus is considerably facilitated and improved.
31 Citations
16 Claims
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1. A diagnostic system for a plurality of control devices having decreasing priority of a motor vehicle, each equipped with a defect memory means and at least one self-diagnostic function means comprising:
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a defect lamp; defect lamp line means connecting said control apparatus to each other and to said defect lamp; data but means including initialization line means connecting said control devices; each control device being responsive to a first distinctive signal on said initialization line means to read-out diagnostic data as a flashing code word on said defect lamp line means to flash said defect lamp, said flashing code word including a start flashing pulse followed by four flashing sequences of up to nine flashing pulses each separated by pauses, each of the four flashing sequences in their timed sequence representing distinctive data; each control device being addressed sequentially in decreasing priority to read-out said diagnostic data of respective control device in a diagnostic sequence with decreasing priority, and being responsive to a second distinctive signal on said initialization line means to discontinue said read-out from a respective control apparatus and begin read-out from a lower priority control device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification