P0530

A/C Refrigerant Pressure Sensor Circuit:

Circuit Description
The A/C refrigerant pressure sensor responds to changes in A/C refrigerant high side pressure. The Powertrain Control Module (PCM) supplies the A/C refrigerant pressure sensor with a 5V reference and a ground circuit. A signal voltage is sent back to the PCM by the A/C refrigerant pressure sensor which is proportional to A/C pressure. The sensor's operating range is between 0 and 450 psi. At 0 psi the signal voltage will be about 0.1V, varying to 4.9V at 450 psi or above.

Conditions For Setting The DTC
- The Intake air temperature is greater than 0°C (32°F)
- The A/C refrigerant sensor pressure is greater than 4.90V with the A/C compressor clutch "ON"
- The A/C refrigerant sensor pressure is greater than 3.98V with the A/C compressor clutch "OFF"
- One or both of the following DTCs are not set P0112, P0113
OR
- The intake air temperature is greater than 0°C (32°F)
- The A/C refrigerant pressure sensor is less than 0.20V after the A/C is requested
- One or both of the following DTCs are not set P0112, P0113

Action Taken When the DTC Sets
- The PCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
- A history DTC is stored.

Conditions for Clearing the DTC
- A history DTC will clear after 40 consecutive warm up cycles without a fault.
- DTCs can be cleared by using a scan tool.

DTC P0530 - A/C Refrigerant Pressure Sensor Circuit:

Test Description
Numbers below refer to the step numbers on the Diagnostic Table.
1. The OBD System Check prompts the Technician to complete some basic checks and store the Failure records on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. This information on the scan tool can be referred to later.
12. Before replacing the PCM, check terminals for improper mating, broken locks, or physical damage to the wiring harness. Replacement PCM must be reprogrammed. Refer to the latest Techline information for programming procedures.