| 摘要 |
PROBLEM TO BE SOLVED: To provide a failure diagnostic device for an intake flow rate sensor preventing erroneous determination and providing high failure determination accuracy by executing failure determination of the intake air flow rate sensor in an appropriate operation area according to contents. SOLUTION: In low flow rate area where intake air flow rate is low (Yes in S6), excessive determination whether output of the intake air flow rate sensor is excessive is executed (S10) since detected intake air flow rate Qa clearly increases. In high flow rate area where intake air flow rate is high (Yes in S8), shortage determination whether output of the intake air flow rate sensor is short is executed (S14) since detected intake air flow rate Qa clearly decreases. A warning lamp is turned on for indication when a failure determination is made in either execution (S12). COPYRIGHT: (C)2009,JPO&INPIT
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