Method and apparatus for diagnosing a vehicle
First Claim
1. A vehicle diagnostic method using a vehicle diagnostic apparatus connected to an electronic control unit equipped on a vehicle to be diagnosed, in which each diagnostic operation for causing each diagnostic portion corresponding to each of a plurality of diagnostic items to be in an expected state is sequentially executed and diagnosing a diagnostic item as passed when an actual state of a diagnostic portion corresponding to a diagnostic operation is in said expected state, between a start and a stop of said each diagnostic operation, comprising the steps of:
- circularly repeatedly diagnosing the plurality of predetermined diagnostic items in a predetermined sequence asynchronously regardless of said each diagnostic operation;
removing the diagnostic item judged to be passed from the diagnostic items;
circularly repeatedly diagnosing at least one remaining diagnostic item that has not been judged as passed; and
diagnosing said remaining diagnostic item as failure when said remaining diagnostic item remains not being judged as passed after a predetermined time has elapsed.
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Accused Products
Abstract
There is provided vehicle diagnostic method and apparatus capable of reducing restrictions on the sequence and timing of operations to be performed by an operator for each diagnostic item.
In the vehicle diagnostic apparatus, the actual vehicle state detected by the vehicle state detection apparatus 223 is compared with the expected state selected by the selection apparatus 222. For example, while the operator runs the vehicle on purpose to execute the "Vehicle Sensor Diagnosis", if an actual state (vehicle speed VS) is detected by the vehicle state detection apparatus 223, an expected state of the vehicle speed (reference vehicle speed VSref) will be selected by the selection apparatus 222. Then both states are compared by the comparison apparatus 224. When both states are identified as exhibiting an expected relation (e.g., correspondence), the comparison apparatus 224 makes the display 27 indicate that the diagnostic item 1 is passed. Specifically, the indication of "01" is erased from the display 27.
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Citations
15 Claims
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1. A vehicle diagnostic method using a vehicle diagnostic apparatus connected to an electronic control unit equipped on a vehicle to be diagnosed, in which each diagnostic operation for causing each diagnostic portion corresponding to each of a plurality of diagnostic items to be in an expected state is sequentially executed and diagnosing a diagnostic item as passed when an actual state of a diagnostic portion corresponding to a diagnostic operation is in said expected state, between a start and a stop of said each diagnostic operation, comprising the steps of:
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circularly repeatedly diagnosing the plurality of predetermined diagnostic items in a predetermined sequence asynchronously regardless of said each diagnostic operation; removing the diagnostic item judged to be passed from the diagnostic items; circularly repeatedly diagnosing at least one remaining diagnostic item that has not been judged as passed; and diagnosing said remaining diagnostic item as failure when said remaining diagnostic item remains not being judged as passed after a predetermined time has elapsed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A vehicle diagnostic apparatus connected to an electronic control unit equipped on a vehicle to be diagnosed, in which when each portion of the vehicle to be diagnosed is operated to be an expected state, determination is made as to whether a plurality of diagnostic items are passed or failed based on whether or not an actual state of said each portion of the vehicle is in the expected state, the vehicle diagnostic apparatus comprising:
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storage means for storing an expected state to be indicated by each portion of the vehicle in response to the operation; vehicle-state detection means for detecting an actual state of each portion of the vehicle circularly; comparison means for comparing the actual state detected circularly with the expected state stored in said storage means; and display means for indicating that the diagnostic item corresponding to the actual state detected is judged to be good when both states exhibit an expected relation. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification