Refrigerant Pressure Sensor / Switch: Service and Repair

APT (A/C PRESSURE TRANSDUCER)

APT (A/C Pressure Transducer) Component Location:

COMPONENT LOCATION

DESCRIPTION
A/C pressure transducer convert the pressure value of high pressure line into voltage value after measure it. By converted voltage value, engine ECM controls cooling fan by operating it high speed or low speed. Engine ECM stop the operation of compressor when the temperature of refrigerant line is so high or so low irregularly to optimize air conditioning system.

INSPECTION




1. Measure the pressure of high pressure line by measuring voltage output between No.1 and No.2 terminals.
2. Inspect the voltage value whether it is sufficient to be regular value or not.

Voltage = 0.00878835 * Pa + 0.37081095

3. If the measured voltage value is not specification, replace the A/C pressure transducer.

REPLACEMENT
1. Disconnect the negative (-) battery terminal.
2. Recover the refrigerant with a recovery/charging station.




3. Disconnect A/C pressure transducer connector (A).