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故障现象一辆2011款雷克萨斯ES240车,装备型号为2AZ-FE的2.4 L VVT-i发动机和U250E自动变速器,行驶里程约为17万km,因空调不能自动切换外循环而进店检查。故障诊断接车后试车验证故障,接通点火开关,起动发动机,发动机顺利起动;接通空调开关,空调制冷正常,测量出风口温度,仅为5℃;观察组合仪表,仪表盘上无任何故障灯点亮,发动机运转平稳。连接故障检测仪对
Fault phenomenon A 2011 Lexus ES240 car, equipped with a model 2AZ-FE 2.4 L VVT-i engine and U250E automatic transmission, mileage is about 170,000 km, due to air conditioning can not automatically switch the outer loop into the store inspection. Fault diagnosis After the test car to verify the fault, turn on the ignition switch, start the engine, the engine started smoothly; connected to air conditioning switch, air conditioning and cooling normal, measuring the outlet temperature, only 5 ℃; observe the combination of instruments, dashboards without any failure Lights lit, the engine running smoothly. Connect the fault detector pair