Air Conditioning (A/C) Compressor

Fig 1: Air Conditioning Compressor

Courtesy of VOLVO CARS OF NORTH AMERICA.

The air conditioning (A/C) pressure sensor detects the pressure in the high-pressure side of the air conditioning (A/C) system.

The sensor is linear. It is grounded in the control module and supplied with a 5 Volt current from the control module. A linear signal (which depends on the pressure in the air conditioning (A/C) system) is transmitted to the engine control module (ECM). Low pressure produces low voltage, high pressure produces high voltage.

The engine control module (ECM) can diagnose the air conditioning (A/C) pressure sensor. The sensor value can be read off using appropriate diagnostics tool.

The air conditioning (A/C) pressure sensor is positioned on the high pressure delivery line for the air conditioning (A/C) system.