The common failure is phenomenon of automobile air conditioner pressure switch
Poor contact of the contacts or malfunction of the pressure switch causes the compressor to fail or fail to function as a normal pressure protection.
Maintenance method of automobile air conditioner pressure switch
1) Check the continuity of the pressure switch
The detection method is as follows: First, unplug the connector of the pressure switch, and measure the resistance between the 4M1 and 4M2 terminals of the pressure switch with a multimeter ohm block. The resistance should be 0. If the resistance is not 0, it means that the normally closed contact of the pressure switch is in poor contact and the pressure switch needs to be replaced; if the resistance is 0, use
The ohm block measures the resistance between the 4M3 and 4M4 terminals of the pressure switch. The resistance should be. o. If the resistance is not co, it means that there is a short circuit inside the pressure switch and the pressure switch needs to be replaced; if the resistance is o, perform pressure switch performance testing.
2) Check the performance of the pressure switch
The working condition of the pressure switch under the specified pressure, the relationship between the pressure switch and the pressure is shown in the table.
If the test result is abnormal, replace the pressure switch.
