Circuit Description
The A/C system uses an A/C refrigerant pressure sensor mounted in the high pressure side of the A/C refrigerant system. The A/C pressure sensor responds to changes in the A/C refrigerant pressure. The PCM uses this information to turn ON the engine coolant fans when the A/C pressure is too high. The PCM also uses the information to disengage the A/C compressor when the A/C refrigerant pressure is excessively high or low. The PCM supplies the sensor with a 5 volt reference and a ground. The sensor returns a signal voltage relative to A/C refrigerant pressures. The PCM monitors the A/C pressure sensor to detect signal voltages outside of the possible range of the sensor. When the PCM detects an A/C pressure signal that is excessively low, DTC P0532 will set.
Conditions for Running the DTC
| • | The engine is running. |
| • | A/C has been requested. |
Conditions for Setting the DTC
| • | The A/C pressure sensor signal is less than 0.1 volt. |
| • | The condition exists for 3 seconds. |
Action Taken When the DTC Sets
| • | The PCM will not illuminate the malfunction indicator lamp (MIL). |
| • | The PCM will store the conditions present when the DTC set as Failure Records data only. |
Conditions for Clearing the MIL/DTC
| • | The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The DTC can be cleared by using the scan tool Clear DTC Information function. |
Diagnostic Aids
If the condition is intermittent, refer to Intermittent Conditions in Symptoms.
