A/C Pressure Sensor

WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. 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 PRESSURE SENSOR OUTPUT VOLTAGE REFERENCE

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

Above 196 kPa (2 0 kgf/cm² , 28 psi)
Below 1,470 kPa (15 0 kgf/cm² , 213 psi)

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

Above 1,470 kPa (15 0 kgf/cm² , 213 psi)
Below 3,138 kPa (32 kgf/cm² , 455 psi)

1945 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

⁽¹⁾	The A/C system pressure can be monitored through the climate control sensor input display function (see TO RUN THE SENSOR INPUT DISPLAY MODE, FOLLOW THESE STEPS )

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 1,390 kPa (14 2 kgf/cm² ,202 psi), the PCM switches the radiator and A/C condenser fans to high speed

Fig 1: A/C Pressure Sensor Output Voltage Graph

Courtesy of AMERICAN HONDA MOTOR CO., INC.