1, check the air conditioner A\/C switch, when the A\/C switch is turned off, the compressor electromagnetic clutch is turned off, when the A\/C switch is closed, the electromagnetic clutch can be sucked.
2, when the vehicle is stationary, the air conditioner still works normally after the working time exceeds 20min.
3, when the road test, only drove 3km, feel the temperature in the car began to rise, feel the natural wind blowing out of the outlet by hand, but the stop check found that the electromagnetic clutch of the air conditioning compressor was always sucking. Observe that the value of the evaporator temperature sensor displayed on the fault diagnosis instrument is gradually increasing, at this time the compressor control current value is 0.80A, but the compressor pressure sensor value is only about 0.80MPa. 3, from the car's air conditioning working condition curve, it can be seen that the evaporator temperature corresponding to point 1 is 2.4 ° C, the compressor pressure sensor value at point 2 is 1.19MPa, and the compressor control current at point 3 is 0.35A.
4, from this time, the temperature of the evaporator gradually rises until the curve on the right side of the screen reaches its highest point of 20.8℃. In this process (starting at point 5), the compressor control current is always 0.80A, and the compressor pressure sensor value is always low, from 1.19MPa to about 0.80MPa. From this process, the air conditioning control unit has reduced the control current to the compressor (to 0.35A) when the evaporator temperature is low, so as to avoid freezing of the evaporator. However, after the evaporator temperature began to rise, the compressor control current from observation point 3 to point 5 has returned to the normal current value of 0.80A, but the pressure of the compressor has not risen. 5, Connect the air conditioning pressure manifold meter, before the road test starts, the normal high and low pressure of the air conditioning system are 1.50MPa and 0.20Mpa respectively. When driving about 3km, it is found that the air conditioner is not cooling, at this time, stop to check the pressure gauge, high and low pressure are 1.15MPa and 0.54MPa, which is not normal. Because it has been determined that the compressor current control is in A normal state, combined with the A\/C switch after a while, and then press the A\/C switch air conditioning system can work normally to analyze, the cause of the fault should be caused by the variable chamber inside the compressor. 6. After the compressor works for A period of time, when the working volume changes, the internal leakage occurs (or because the electromagnetic control valve is not tightly sealed, resulting in leakage), at this time, the switch is turned off, and then the A\/C switch is opened, the electromagnetic control valve of the compressor can be temporarily restored to normal after being energized, the pressure can be established, and the air conditioner can be cooled again. Troubleshooting: After replacing the new air conditioning compressor and charging according to the standard refrigeration dose, the air conditioning can work normally, and the test failure does not occur.
If the AC switch of Toyota Reishi's air conditioner flashes, it may be due to the following reasons:
1. If the power supply is faulty, check whether the battery is working properly to ensure voltage stability;
2. Fuse problem, check whether the fuse is burned or loose;
3. The air conditioner pressure problem may be caused by the protection mechanism starting due to too high or too low refrigerant pressure;
4. Circuit failure may be caused by poor line contact or circuit board failure. It is recommended that you check the above problems and consult a professional auto repair technician for further diagnosis and repair if necessary.