| 摘要 |
A system for identifying faults in an electrical circuit such as a circuit of a road vehicle. The electrical circuit is intended to provide a plurality of outputs such as lamp illumination in response to predetermined circuit conditions. Data describing individual components of the electrical circuit and the interconnections therebetween is stored. Data identifying a fault symptom is input to the system by a technician to indicate that for one said predetermined set of circuit conditions the intended output is not provided. Stored data is accessed which describes selected components which if faulty could be the cause of the fault symptom. Values of electrical variables to be expected at predetermined measurement points in a sub-circuit defined by the selected components and the connections therebetween are calculated. Measurement points are selected at which points the electrical variables are to be measured and the technician is instructed to selectively input measurement data indicating the electrical variables measured at the selected measurement points. The input measurement data is compared with the calculated electrical variables and faulty components are identified in accordance with that comparison data.
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