| 摘要 |
Diagnosing apparatus and method diagnose an engine system provided with a heat accumulating device arranged to preheat an engine. A warm-up state of the engine system, before a warm-up operation of the engine by the heat accumulating device, is detected so that warm-up data representative of the detected warm-up state is stored in a memory, and the engine system is diagnosed to detect its warm-up state on the basis of the warm-up data stored in the memory. This arrangement permits accurate diagnosis of a warm-up state of an engine system.
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