Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
A/C Refrigerant Pressure Sensor and Its Circuit Inspection
Reference: A/C REFRIGERANT PRESSURE SENSOR REMOVAL AND INSTALLATION: MANUAL A/C
- Disconnect A/C refrigerant pressure sensor connector.
- Turn ignition switch to ON position.
- Check if voltage between "RED" wire terminal and "ORN" wire terminal of A/C refrigerant pressure sensor connector is 4.75 V to 5.25 V.
If not, check A/C refrigerant pressure sensor circuit.
- Connect A/C refrigerant pressure sensor connector with ignition switch turned OFF.
- Connect manifold gauge set to the charging valves.
- Check A/C refrigerant pressure sensor voltage of ECM connector referring to A/C SYSTEM INSPECTION AT ECM: MANUAL A/C .
If voltage is not as specified below, replace A/C refrigerant pressure sensor.
A/C refrigerant pressure sensor voltage specifications (A/C refrigerant pressure measured by manifold gauge)
0.8 MPa (8.0 kgf/cm 2 , 116 psi): 1.40 - 1.78 V
1.4 MPa (14 kgf/cm 2 , 203 psi): 2.18 - 2.64 V
1.6 MPa (16 kgf/cm 2 , 232 psi): 2.44 - 2.92 V
1.8 MPa (18 kgf/cm 2 , 261 psi): 2.70 - 3.21 V
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.