Refrigerant Pressure Sensor / Switch: Testing and Inspection

AIR CONDITIONING PRESSURE SENSOR:

ON-VEHICLE INSPECTION

1. INSPECT PRESSURE SENSOR
(a) Install the manifold gauge set Refrigerant.





(b) Connect the three 1.5 V dry cell batteries' positive (+) lead to terminal 3 and the negative (-) lead to terminal 1. Then connect the voltmeter's positive (+) lead to terminal 2 and the negative (-) lead to terminal 1. Measure the voltage.
OK:
The voltage changes according to refrigerant pressure, as shown in the graph.
If the voltage is not as specified, replace the pressure sensor.