| 摘要 |
When an insulation resistance value of an ignition plug is smaller than a prescribed value, an engine operation state is switched so as to raise a temperature of the ignition plug, thereby promoting deposit cleaning (step ST3). Such a measures-against-deposit carrying-out state is counted (step ST4). When a count value exceeds a certain value (step ST1), that is, when the measures against deposit have sufficiently been performed but the insulation resistance value of the ignition plug is smaller than the prescribed value (step ST2), it is determined that conductive deposit has adhered to the ignition plug, and for example, an alarm light is turned on (step ST8) in order to urge a driver to perform maintenance of the ignition plug.
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