| 摘要 |
PURPOSE:To make it possible to detect a failure with a simple structure by providing such an arrangement that a failure of a water pump and a breakage or short-circuit of the wiring therefor are detected in accordance with a control signal for turning on or off the water pump and a terminal voltage of the water pump. CONSTITUTION:Cooling medium is circulated through a heat-exchanger (intercooler) 6 for cooling pressurized air fed through a supercharger 5 from a radiator 7 disposed outside of an intake-air pipe 2 in association with the operation of a water pump 8 which is controlled by an electronic control device 15 in accordance with detection signals from an idle switch 11 and an engine warm-up sensor. In this case, the electronic control device 15 judges whether an instruction for turning on the water pump 8 is on delivery or not, and if the turn on instruction is on delivery, further judges whether a voltage at a terminal of the water pump 8 is above a predetermined value or not. Further, when it is above the predetermined value, it is determined that a short-circuit failure occurs, and an alarm is emitted. |
