故障现象一辆帕萨特1.8T柴油车,搭载BPZ发动机,行驶里程约为40万km。据驾驶人反映,该车高速时加速无力。故障诊断试车发现,车速在80 km/h之前,车辆加速正常;若车速达到80 km/h后继续加速,车辆加速无力。用故障检测仪检测,有“增压压力限制”的故障记录。根据车况和故障信息更换了废气涡轮增压器,经试车,车辆加速性能有所好转,但车速只能达到100 km/h,同时故障检测仪里存储 Fault phenomenon A Passat 1.8T diesel car, equipped with BPZ engine, driving mileage of about 40 million km. According to the driver reflected that the car speeding weakness. Troubleshooting test found that the vehicle speed up to 80 km / h before the normal vehicle acceleration; if the speed reached 80 km / h continue to accelerate, the vehicle acceleration weakness. Detected with a fault detector, a “supercharger pressure limit” fault record. Exhaust gas turbocharger was replaced according to the condition of the vehicle and the fault information. After the test run, the acceleration performance of the vehicle improved but the speed could only reach 100 km / h. At the same time, the fault detector stored