Hyundai Tucson Quiz
Heating, Ventilation and Air Conditioning

A/C AIR PRESSURE SENSOR

In this manual: Heating, Ventilation and Air Conditioning
General Information — 17Engine Mechanical System — 51Engine Electrical System — 26Emission Control System — 23Engine/Fuel Control System — 44Clutch System — 12MANUAL TRANSMISSION SYSTEM — 12AUTOMATIC TRANSMISSION SYSTEM — 42Four-Wheel Drive (4WD) System — 14Drive Shaft and Axle — 22Suspension System — 30Steering System — 16Restraint — 21Braking System — 47Body Work (Interior and Exterior) — 145Body Electrical System — 162Heating, Ventilation and Air Conditioning — 39
11steps
~66min
3/5difficulty
0102030405011.89N·mlb·ft
Tightening torque found on this page
Done 0 of 11

Description and Operation

Description

The A/C pressure sensor (APT) measures the high-pressure line pressure and converts it into a voltage signal. Based on this signal, the ECM controls the cooling fan, operating it at high or low speed. The ECM stops compressor operation when the refrigerant line temperature is too high or too low, in order to optimize the air conditioning system.

Repair Procedures

Inspection

  1. Measure the high-pressure line pressure by checking the output voltage between terminals "1" and "2".
  2. Check the voltage to determine whether it is within specification.

    Voltage = 0.00878835 * Pressure + 0.37081095

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

Diagnosis with GDS

  1. The heating, ventilation and air conditioning (HVAC) system can be diagnosed quickly (defective parts) using the Global Diagnostic System (GDS). ※ The GDS provides the following information. (1) Self-diagnosis: checks and displays diagnostic trouble codes (DTC). (2) Current data: checks the status of input/output signals. (3) Active test: checks system operating conditions. (4) Additional functions: in addition to control, such as zero point adjustment.
  2. Select the "Vehicle Model" and the system to be checked in order to inspect the vehicle with the scan tool.
  3. Select the "Current Data" menu to check the current status of inputs/outputs. The inputs/outputs of the sensors related to the A/C pressure transducer can be checked.

REPLACEMENT

  1. Disconnect the negative (-) battery terminal.
  2. Recover refrigerant using a refrigerant recovery/recycling unit (recovery/recycling station).
  3. Disconnect the air conditioning pressure sensor connector (B).
  4. Remove the A/C pressure sensor (A).

    Tightening torque: 9.8–11.8 N·m

  5. To install, perform the removal procedure in reverse order.

Test yourself

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