Description of A/C Signal System in Eighty-Eight LSS FWD V6-38L (1996)
A/C Signal: Description and Operation
AC REQUEST PCM INPUT
The A/C request signal indicates to the PCM that an A/C mode is selected at the A/C control head. The PCM uses this information to adjust the
idle speed before turning ON the A/C clutch. If this signal is not available to the PCM, the A/C compressor will be inoperative.
AC REFRIGERANT PRESSURE SENSOR
The A/C refrigerant pressure sensor signal indicates high side refrigerant pressure to the PCM. The PCM uses this information to adjust the idle air
control valve to compensate for the higher engine loads present with high A/C refrigerant pressures and to control the cooling fans. A fault in the
A/C refrigerant pressure sensor signal will cause DTC P0530 to set.
