Refrigerant Pressure Sensor / Switch: Testing and Inspection

AIR CONDITIONING: AIR CONDITIONING PRESSURE SENSOR: ON-VEHICLE INSPECTION

ON-VEHICLE INSPECTION

1. INSPECT A/C PRESSURE SWITCH
(a) Disconnect the connector from the A/C pressure sensor.
Inspect pressure switch operation.





(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 (PR), 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 A/C pressure sensor.