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案例1宝马523Li车空调不制冷,燃油表显示不准故障现象一辆2011年生产的宝马523Li轿车,行驶里程约为4.7万km,出现空调不制冷,燃油表显示不准(昨晚添加50 L的燃油后行驶不到10 km,今早燃油表显示剩余的燃油只能再开30 km)的故障。故障诊断检查空调压力传感器及其到接线盒电子装置的线路,未见异常;检查燃油位置传感器及其到接线盒电子装置的线路,发现燃油位置传感器导线破损(图1),导致与燃油泵外壳短路,使接线盒电子装置损坏。故障排除更换破损的导线及接线盒电子装置后试车,故障排除。
Case 1 BMW 523Li car air conditioning is not cooling, fuel gauge display is not allowed Fault phenomenon A BMW 523Li sedan produced in 2011, mileage of about 47,000 km, the air conditioning is not cooling, the fuel gauge display is not allowed (last night added 50 L Less than 10 km of fuel and the fuel gauge this morning shows that the remaining fuel can only be re-opened for 30 km. Troubleshooting Check the air conditioner pressure sensor and its wiring to the junction box electronics without exception; check the fuel position sensor and its wiring to the junction box electronics for damage to the fuel position sensor lead (Figure 1) Short circuit, damaging the junction box electronics. Troubleshooting After replacing damaged wires and junction box electronics, try it out and troubleshoot it.