DTC P0533-00: A/C Refrigerant Pressure Sensor 'A' Circuit High Input: General Description

The ECM/PCM This input indicates how much load the A/C compressor is putting on the engine and is one of the factors used by the ECM/PCM in order to determine the idle air control position for the idle speed. The circuits consist of a 5V reference and a ground, both provided by the ECM/PCM, and a signal from the sensor. The signal voltage is proportional to the A/C pressure from 0 to 5 volts. Low pressure produces a low voltage signal and high pressure a high-voltage signal.