Circuit Description

PCM uses input signal from A/C refrigerant pressure sensor (mounted in high pressure line) to monitor A/C refrigerant pressure. PCM uses this information to turn on engine cooling fans when A/C refrigerant pressure is high and to keep compressor disengaged when refrigerant pressure is excessively high or low. PCM monitors the A/C refrigerant signal circuit and can determine when the signal is outside of the possible range of the sensor. If signal is out of range (high or low) for a prolonged period of time, PCM will set this DTC. When DTC is set, PCM will not allow compressor to engage.

DTC will set when A/C refrigerant pressure sensor signal voltage is less than 0.10 volt or when sensor signal voltage is greater than 4.9 volts and for longer than 20 seconds.