| 摘要 |
PROBLEM TO BE SOLVED: To provide a diagnostic device for temperature sensors for improving its failure diagnostic accuracy.SOLUTION: An engine 10 includes a fuel temperature sensor 12 and temperature sensors 11, 13-14 provided separately from the fuel temperature sensor 12. A diagnostic device 5 diagnoses failures of the temperature sensors 11, 13-14. In the diagnostic device 5, a diagnostic part 1 is provided for diagnosing the failures of the temperature sensors 11, 13-14 on the basis of temperatures detected by the temperature sensors 11, 13-14 at starting the engine 10. A fuel temperature reference part 4 is also provided for determining whether a state of the failures of the temperature sensors 11, 13-14 is unfixed or not on the basis of a variation Dof a fuel temperature FT after starting the engine 10, during the diagnosis by the diagnostic part 1.SELECTED DRAWING: Figure 1 |
