Fault diagnostic system for vehicles using identification and program codes
First Claim
1. A fault diagnostic system for connection to a computer-aided electronic control unit carried on a vehicle for detecting and diagnosing faults in vehicle parts connected to said electronic control unit, said fault diagnostic system comprising:
- means for providing a control unit identification code that identifies the type of electronic control unit that is being carried on the vehicle;
means for providing a vehicle identification code that identifies the type of vehicle on which the electronic control unit is being carried;
storage means for storing a plurality of diagnostic programs;
a priority table in which a fault code and diagnostic priority are assigned for an electronic control unit fault and for each faulty vehicle part respectively;
abnormality detecting means for detecting abnormality of said electronic control unit and vehicle parts and outputting a fault code corresponding to each abnormality;
means responsive to detection of a plurality of abnormalities for accessing said priority table using the plurality of fault codes output from said abnormality detecting means as retrieval keys, and displaying the fault codes corresponding to said abnormalities along with said priority; and
program selecting means jointly responsive to said control unit identification code, to said vehicle identification code, and to a fault code and priority selected by an operator from said display for retrieving one of said diagnostic programs from said storage means for use by said fault diagnostic system.
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Abstract
A memory stores a vehicle identifier code which enables identification of a vehicle carrying the same type of electronic control unit (ECU) correspondingly to an ECU identification code (ECU-ID) and display means for displaying the vehicle identifier code is displayed on the basis of the ECU-ID provided by an ECU, and a predetermined fault diagnostic program corresponding to the vehicle identifier code is selected and initiated in response to the input of a verification signal of the displayed vehicle identifier code. When a plurality of faulty parts of a vehicle are detected, a priority table is referred to and fault codes corresponding to the plurality of faulty parts are displayed with priority. The necessary specific work procedure is sequentially displayed according to the selected diagnostic program.
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Citations
10 Claims
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1. A fault diagnostic system for connection to a computer-aided electronic control unit carried on a vehicle for detecting and diagnosing faults in vehicle parts connected to said electronic control unit, said fault diagnostic system comprising:
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means for providing a control unit identification code that identifies the type of electronic control unit that is being carried on the vehicle; means for providing a vehicle identification code that identifies the type of vehicle on which the electronic control unit is being carried; storage means for storing a plurality of diagnostic programs; a priority table in which a fault code and diagnostic priority are assigned for an electronic control unit fault and for each faulty vehicle part respectively; abnormality detecting means for detecting abnormality of said electronic control unit and vehicle parts and outputting a fault code corresponding to each abnormality; means responsive to detection of a plurality of abnormalities for accessing said priority table using the plurality of fault codes output from said abnormality detecting means as retrieval keys, and displaying the fault codes corresponding to said abnormalities along with said priority; and program selecting means jointly responsive to said control unit identification code, to said vehicle identification code, and to a fault code and priority selected by an operator from said display for retrieving one of said diagnostic programs from said storage means for use by said fault diagnostic system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification