故障一:开空调后,空调机有时工作有时不工作,工作时有时自动断开,故障没有规律此车采用丰田8A 电喷发动机,空调电路比较复杂,并且发动机电控单元也参与了空调机控制,要快速判断故障所在,需了解其电路原理,见下图。由图可知,空调机是否工作取决于空调压缩机继电器是否工作,继电器的工作取决于其线圈的供电及搭铁是否正常。 Fault 1: open air conditioning, air conditioners and sometimes work sometimes does not work, work sometimes automatically disconnect the fault is not regular The car uses Toyota 8A EFI engine, air conditioning circuit is more complex, and the engine ECU also involved in the air-conditioning control , To quickly determine where the fault, need to understand the circuit principle, see below. As can be seen from the figure, whether the air conditioner works depends on whether the air conditioner compressor relay is working or not, and the relay’s operation depends on the power supply of the coil and whether the ground is normal.