| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a device, capable of easily, sufficiently and accurately diagnosing flowing resistance, in an intake pipe of an internal combustion engine. SOLUTION: A first intake pipe pressure is measured, when air mass passing quantity is small, a second intake pipe pressure is measured when the air mass passing quantity is large, a pressure difference is determined from the first intake pipe pressure and the second intake pipe pressure, the pressure difference is compared with a first reference value, and when the pressure difference is larger than the first reference value, a signal is sent out.
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