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案例1苏州金龙KLQ6125A2型客车正常行驶时发动机转速表有时指示在较低位置故障现象一辆行驶里程约为3万km的苏州金龙KLQ6125A2型客车(配置玉柴YC6L330-30发动机与哈尔滨威帝VT-CQL272 CAN总线系统的VT-ZB型仪表总成),驾驶人反映,车辆正常行驶时,发动机转速表有时指示在较低位置,停车时,有时又不能正常复位。故障诊断车辆到维修车间检修,维修技术人员根据驾驶人反映的情况,初步判断为发动机转速表不灵敏或失效。该车配置的是威帝总线电路,公司有几辆相同型号的车辆,将有故障车辆的仪表总成与其中一辆车辆的仪表总成进行互换试验,故障车的仪表总成装到另外一辆车辆上,转速表还是出现相同的现象,因而确定该仪表总线存在故障。
Case 1 Suzhou Jinlong KLQ6125A2-type passenger car running normally when the engine tachometer at a lower position sometimes indicates a phenomenon of a mileage of about 30,000 km Suzhou Jinlong KLQ6125A2 bus (Yuchai YC6L330-30 configuration with the VW VT- CQL272 CAN bus system VT-ZB type instrument assembly), the driver reflects the normal driving of the vehicle, the engine tachometer sometimes indicates the lower position, parking, and sometimes can not normally reset. Fault diagnosis vehicle maintenance workshop maintenance, repair technicians reflect the situation based on the driver, initially determine the engine tachometer insensitive or failure. The car is equipped with Wei Di bus circuit, the company has several vehicles of the same type, the faulty vehicle instrumentation assembly and one of the vehicle instrument assembly interchangeable test, the faulty vehicle instrumentation assembly installed to another The same thing happens with the tachometer in a vehicle, so it is determined that the instrument bus is faulty.