P0530

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

Schematic:

CIRCUIT DESCRIPTION
The Air Conditioning (A/C) refrigerant pressure sensor responds to the changes in the A/C refrigerant high side pressure. This input indicates how much load the A/C compressor is putting on the engine, and is one of the factors used by the Powertrain Control Module (PCM) in order to determine the Idle Air Control (IAC) position for the idle speed. The circuits consist of a 5 volt reference and a ground, both provided by the PCM, and a signal from the sensor. The signal is a voltage which is proportional to the A/C pressure. The sensor's operating range is between 0 and 459 psi. At 0 psi, the signal voltage will be approximately 0.1 volt, varying to approximately 4.9 volt at 459 psi.

CONDITIONS FOR RUNNING THE DTC
The A/C refrigerant sensor pressure is more than 453 psi (4.90 volt) with the A/C requested.
OR
The A/C refrigerant sensor pressure is more than 363 psi (4.0 volt) with the A/C not requested.
OR
The A/C refrigerant pressure sensor is less than 0 psi (0.10 volt) 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 volt) 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 will record the operating conditions at the time during which the diagnostic fails. This information will store in the Failure Records buffer.
^ A history DTC stores.
^ The PCM will disable the A/C compressor clutch.

CONDITIONS FOR CLEARING THE MIL/DTC
^ A history DTC will clear after 40 consecutive warm up cycles without a fault.
^ Use a scan tool to clear the DTCs.

DIAGNOSTIC AIDS
^ The DTC P0530 sets when the signal voltage is outside of 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. Refer to the Air Conditioning System.
^ Thoroughly check any suspected circuitry for the following conditions:
- Backed-out terminals
- Improper mating of the terminals
- Broken locks
- Improperly formed or damaged terminals
- Faulty terminal-to-wire connections
- Physical damage to the wiring harness

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