Hyundai Ioniq (AE): Air Conditioning System / A/C Pressure Transducer. Repair procedures

Hyundai Ioniq (AE) 2017-2022 Service & Repair Manual / Heating, Ventilation and Air Conditioning / Air Conditioning System / A/C Pressure Transducer. Repair procedures

Inspection
   
•
Before measuring the pressure of the refriferant line, check whether the refrigerant amount is charged in accordance with the specified charging amount.
(Refer to Heating, Ventilation, Air Conditioning - "Specifications")
1.
Turn the ignition switch OFF.
2.
Install the refrigerant recovery/recycling/charging system.
(Refer to Air Conditioning System - "Repair procedures")
3.
Turn ON the ignition switch, put into operation the air conditioner.
4.
Calculate the reference voltage of the Recovery/Recycle/Recharge machine high pressure value using the formula below.
Reference voltage (V) = 0.0088 * pressure(psi) + 0.37
5.
Measure the sensor output voltage between terminal "1" and "2".

Pin No
Function
1
Ground
2
Voltage
3
Power (+5V)

6.
If the reference voltage value and the sensor output voltage value are close to each other, the air conditioner pressure transducer is normal.
7.
If 0V is output or the reference voltage value and sensor output voltage value are not close to each other, replace the air conditioner pressure transducer.
   
•
Check if the output voltage changes when the high pressure value of the refrigerant line changes.

Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Recover the refrigerant with a recovery/charging station.
   
•
If the POE oil of the system gets mixed with PAG oil, then dielectric breakdown due to decreased volumetric resistivity can occur and inoperative A/C compressor may result, A/C compressor may not work.
3.
Disconnect the A/C pressure transducer connector (A).

4.
Remove the A/C pressure transducer (A).
Tightening torque :
9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft)

   
•
Be careful not to bend the liquid & suction pipe.
5.
To install, reverse the removal procedure.
   
•
When installing, replace it with a new O-ring.

    DescriptionThe A/C Pressure Transducer (APT) converts the pressure value of high pressure line into voltage value after measuring it. By converted voltage value, engine ECU controls the cooling fan by operating it high speed or low speed.

    DescriptionThe evaporator temperature sensor will detect the evaporator core temperature and interrupt compressor relay power in order to prevent evaporator from freezing by excessive cooling.

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