How does the air conditioning pressure switch check?
Four lines! One of which is the Ac request signal line 12v one is to the ECU! System refrigerant is sufficient, they are interlinked! For high voltage switch! It is broken ECU can not receive Ac signal, the compressor will not start! One is to take the wire! One is the ECU in the pressure detection line 5v! System refrigerant is interlinked when sufficient!
Low-voltage switch, not connected in the system, it should be disconnected
High voltage switch, not connected in the system, should be closed
Automotive air conditioning pressure switch power supply by the three-state switch from the 3-pin switch into the switch, through the internal series of high-voltage switch and low-voltage switch from the 1 # feet output to the air conditioning controller and compressor relay. Three-state switch 4 # feet connected to the iron, after the pressure switch from the 3 # pin output high-speed fan request signal to the engine computer, both pressure greater than 1.77MPa when the condenser fan high-speed turn, less than 1.37MPa condenser fan low speed The
