Circuit Description
WARNING: This page is about a different car, the 2000 Isuzu Hombre. However, it is still accessible from the selected car via links, so may be relevant.
A/C refrigerant pressure sensor responds to changes in A/C refrigerant high side pressure. Powertrain Control Module (PCM) supplies and monitors 5-volt reference circuit to the pressure sensor. Pressure sensor operating range is 0-459 psi. At zero psi, signal voltage should be about .2 volt. At 459 psi or greater, signal voltage should be about 5.0 volts.
Conditions for setting this DTC are:
- A/C pressure sensor signal is greater than 453 psi (4.90 volts) with A/C on.
- A/C pressure sensor signal is greater than 363 psi (4.0 volts) with A/C off.
- Refrigerant pressure is less than zero psi (0.20 volt), IAT signal is greater than 32°F (0°C) and DTC P0112 or P0113 is not set.
- Refrigerant pressure is less than zero psi (0.10 volt), IAT signal is greater than 32°F (0°C) and DTC P0112 or P0113 is set.
- Conditions exist for greater than 15 seconds.