P0530

DTC P0530 Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit




Circuit Description
The A/C refrigerant pressure sensor responds to changes in A/C refrigerant high side pressure. This input indicates how much load the A/C compressor is putting on the engine. The PCM uses this input in order to determine the Idle Air Control (IAC) position for idle speed. The PCM supplies the A/C refrigerant pressure sensor with a 5 V 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 the A/C pressure. The operating range of the sensor is between 0 and 459 psi. At 0 psi the signal voltage will read between 0.20 V varying to 5.0 V at 459 psi or above.

Conditions for Running the DTC
The A/C refrigerant sensor pressure is more than 453 psi (4.90 V) with the A/C requested.

OR

The A/C refrigerant sensor pressure is more than 363 psi (4.0 V) with the A/C not requested

OR

The A/C refrigerant pressure sensor is less than 0 psi (0.1OV) when the intake air temperature is more than 0° C (32° F) and DTC P0112 or P0113 is not set.

OR

The A/C refrigerant sensor pressure is less than 0 psi (0.10 V) when an IAT sensor DTC is present.

Conditions for Setting the DTC
Any of the above conditions are met for 15 seconds.

Action Taken When the DTC Sets
- The PCM records the operating conditions at the time the diagnostic fails. The Failure Records buffers stores this information.
- The PCM stores a history DTC.
- The PCM disables the A/C compressor clutch.

Conditions for Clearing the DTC
- A history DTC clears after 40 consecutive warm up cycles without a fault.
- The scan tool can clear the DTC.

Diagnostic Aids
- An intermittent DTC P0530 set along with a DTC P0405 indicates that the ground circuit is shorting to the 5 volt reference circuit. When this happens, the EGR Actual Position on the scan tool will display an incorrect value. Check the wiring harness for being rubbed through and shorting together or for a faulty A/C refrigerant pressure sensor.
- DTC P0530 sets when the signal voltage falls outside the normal possible range of the sensor. If the actual pressure of the A/C system matches the scan tool readings, repair any A/C pressure problems before using this table.
- Any circuitry, that is suspected as causing the intermittent complaint, should be thoroughly checked for the following conditions:
- Backed out terminals
- Improper mating of the terminals
- Broken locks
- Improperly formed or damaged terminals
- Poor terminal to wiring connections
- Physical damage to the wiring harness

Steps 1 - 2:

Steps 3 - 4:

Steps 5 - 8:

Steps 9 - 15:

Steps 16 - 19:

Test Description
The numbers below refer to the step numbers on the Diagnostic Table.
2. This step determines is the fault is present or an intermittent fault.
5. This step determines if the fault is an electrical fault or a refrigerant pressure fault.