Circuit Description

A/C refrigerant pressure sensor is located on the high side of A/C system and is used to monitor refrigerant pressure. PCM uses this information to run cooling fans when A/C refrigerant pressure is high. A 5-volt reference voltage is supplied to sensor and is returned to the PCM on the signal circuit. Sensor resistance changes as refrigerant pressure increases or decreases.

PCM monitors the A/C refrigerant pressure sensor signal circuit and can determine when A/C pressure is too high or too low. When pressures are out of range (high or low) for a predetermined time, PCM will disable the A/C compressor clutch and set DTC.