Circuit Description

The A/C refrigerant pressure sensor responds to changes in A/C refrigerant high side pressure. This input indicates how much load the A/C compressor is putting on engine and is one of the factors used by PCM in order to determine IAC position for idle control. The signal voltage is proportional to A/C pressure. The sensor operating range is 0-459 psi. At zero psi, signal voltage will be about 0.1 volt, varying to about 4.9 volts at 459 psi.

DTC will set if any of following conditions are met for 15 seconds:

• A/C refrigerant pressure sensor greater than 363 or 453 psi (4.0 or 4.9 volts) with A/C requested.
• A/C refrigerant pressure sensor less than zero psi (.2 volt) when IAT is greater than 32°F (0°C) and DTC P0112 or P0113 is not set.
• A/C refrigerant pressure sensor less than zero psi (.10 volt) when IAT sensor DTC is present or IAT is less than 32°F (0°C).