A/C Pressure Sensor
WARNING: This page is about a different car, the 2011 Honda CR-V, 2010 Honda CR-V, 2009 Honda CR-V, 2008 Honda CR-V, and 2007 Honda CR-V. However, it is still accessible from the selected car via links, so may be relevant.
The A/C pressure sensor converts A/C pressure into electrical signals to the PCM.
A/C SYSTEM PRESSURE REFERENCE CHART
| A/C System Pressure(1) | Sensor Output Voltage (V out) | System Operation | ||
|---|---|---|---|---|
| Abnormally low pressure: Below 196 kPa (2.0 kgf/cm2 , 28 psi) | Below 0.685 V | The PCM disengages the compressor clutch. The radiator and condenser fans operate based on engine coolant temperature. | ||
Normal operating pressure:
|
0.686 V to 1.944 V | The PCM cycles the compressor clutch based on cooling demand. The radiator and condenser fans operate at low speed unless the engine coolant temperature exceeds 206°F(97°C) | ||
High operating pressure:
|
1.945 V to 4.575 V | The PCM cycles the compressor clutch based on cooling demand. The radiator and condenser fans operate at high speed. | ||
| Abnormally high pressure: More than 3, 138 kPa (32 kgf/cm2 , 455 psi) | Above 4.575 V | The PCM disengages the compressor clutch. The radiator and condenser fans operate based on engine coolant temperature. | ||
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The response of the A/C pressure sensor is shown in the graph.
NOTE:
When the refrigerant is below 196 kPa (2.0 kgf/cm2
, 28 psi) or above 3, 138 kPa (32 kgf/cm2
, 455 psi), the PCM turns the compressor relay off to protect the A/C compressor. When the refrigerant pressure is above 1, 470 kPa (15.0 kgf/cm2
, 213 psi), the PCM switches the radiator and A/C condenser fans to high speed.