A/C Pressure Sensor
The A/C pressure sensor converts A/C pressure into electrical signals to the PCM.
| A/C System Pressure | Sensor Output Voltage (V out) | System Operation |
|---|---|---|
| Abnormally low pressure: Below 196 kPa (2.00 kgf/cm 2 , 28.4 psi) | Below 0.685 V | The PCM disengages the A/C compressor clutch. The radiator and the A/C condenser fans operate based on engine coolant temperature. |
| Normal operating pressure: Above 196 kPa (2.00 kgf/cm 2 , 28.4 psi) Below 1, 470 kPa (14.99 kgf/cm 2 , 213.2 psi) | 0.686 V to 1.944 V | The PCM cycles the A/C compressor clutch based on cooling demand. The radiator and the A/C condenser fans operate at low speed unless the engine coolant temperature exceeds 206°F (97°C). |
| High operating pressure: Above 1, 470 kPa (14.99 kgf/cm 2 , 213.2 psi) Below 3, 138 kPa (32.00 kgf/cm 2 , 455.1 psi) | 1.945 V to 4.575 V | The PCM cycles the A/C compressor clutch based on cooling demand. The radiator and the A/C condenser fans operate at high speed. |
| Abnormally high pressure: More than 3, 138 kPa (32.00 kgf/cm 2 , 455.1 psi) | Above 4.575 V | The PCM disengages the A/C compressor clutch. The radiator and the A/C condenser fans operate based on engine coolant temperature. |
| *: The A/C system high side pressure can be monitored through the climate control sensor input display function (see RUN THE SENSOR INPUT DISPLAY MODE ). | ||
The response of the A/C pressure sensor is shown in the graph.
Note. When the refrigerant is below 196 kPa (2.00 kgf/cm 2 , 28.4 psi) or above 3, 138 kPa (32.00 kgf/cm 2 , 455.1 psi), the PCM turns the A/C compressor clutch relay off to protect the A/C compressor. When the refrigerant pressure is above 1, 470 kPa (14.99 kgf/cm 2 , 213.2 psi), the PCM switches the radiator and the A/C condenser fans to high speed.
