DTC Description
This diagnostic procedure covers DTC P0530-A/C Refrigerant Pressure Sensor Circuit.
Circuit Description
The powertrain control module (PCM) supplies a positive 5-volt reference voltage to the air-conditioning (A/C) refrigerant pressure sensor through reference circuit and ground through the low reference circuit.
The A/C pressure sensor provides signal voltage to the PCM through the signal circuit that is proportional to the A/C refrigerant pressure. The PCM monitors the signal voltage of the A/C pressure sensor to determine the refrigerant pressure.
| • | The A/C pressure sensor voltage increases as the refrigerant pressure increases. |
| • | When the PCM detects that the refrigerant pressure exceeds a predetermined value, the PCM activates the cooling fans to reduce the refrigerant pressure. |
| • | When the PCM detects that the refrigerant pressure is too high or too low, the PCM disables the A/C clutch to protect the A/C compressor from damage. |
An A/C refrigerant pressure sensor circuit DTC sets if the PCM detects that the A/C pressure sensor signal is not within the specified range.
Conditions for Running the DTC
The engine is running or when the A/C is switched ON.
Conditions for Setting the DTC
The A/C refrigerant pressure signal voltage is outside the predetermined range.
Conditions for Clearing DTC
The A/C refrigerant pressure sensor circuit DTC is a Type C DTC. Refer to Engine Controls System Component Description for Action Taken when a Type C DTC sets and Conditions for Clearing a Type C DTC.
Additional Information
| • | Refer to General Air Conditioning (A/C) System Description and Operation for details of the A/C refrigerant pressure sensor operation. |
| • | For an intermittent fault condition, refer to Intermittent Conditions. |
| • | The A/C refrigerant pressure sensor circuit diagnostic table is developed with the assumption that the A/C refrigerant system is functioning correctly. Therefore, rectify any A/C refrigerant system fault conditions before proceeding with this diagnostic procedure. |
| • | Since fault condition in a wiring connector may trigger DTCs, always test the connectors related to this diagnostic procedure for shorted terminals or poor wiring connection before replacing any component. Refer to Testing for Intermittent Conditions and Poor Connections for information on electrical fault diagnosis. |
| • | Refer to HVAC Schematics and HVAC Connector End Views to aid in the diagnosis procedures. |
Test Description
The numbers below refer to the steps in the diagnostic table.
2. Determines if there is an A/C refrigerant system fault condition.
6. Measures the integrity of the A/C pressure sensor low reference circuit. Removal of the PCM fuse 29 enables the PCM to power down completely prior to the test procedure.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Main Diagnostic Table performed? | -- | Go to Step 2 | Refer to Diagnostic System Check - HVAC Systems - Automatic |
2 | Test the A/C refrigerant system. Refer to Air Conditioning (A/C) System Performance Test. Was any fault found and rectified? | -- | Go to Step 12 | Go to Step 3 |
3 |
Does DTC P0530 fail this ignition cycle? | -- | Go to Step 4 | Refer to Diagnostic Aids for the A/C Refrigerant Pressure Sensor Circuit DTC |
4 |
Is the voltage within the specified range? | 4.8-5.2 V | Go to Step 5 | Go to Step 7 |
5 |
Is the voltage within the specified value? | 4.8-5.2 V | Go to Step 6 | Go to Step 8 |
6 |
Important: Install the PCM fuse 29 to the engine compartment fuse and relay panel assembly after completing the test. Is the resistance less than the specified value? | 4.8-5.2 V | Go to Step 10 | Go to Step 9 |
7 | Test the A/C pressure sensor 5-volt reference circuit for a high resistance, open circuit, short to ground, or short to voltage fault condition. Refer to Testing for Intermittent Conditions and Poor Connections for information on electrical fault diagnosis. Was any fault found and rectified? | -- | Go to Step 12 | Go to Step 11 |
8 | Test the A/C pressure sensor signal circuit for a high resistance, open circuit, short to ground, or short to voltage fault condition. Refer to Testing for Intermittent Conditions and Poor Connections for information on electrical fault diagnosis. Was any fault found and rectified? | -- | Go to Step 12 | Go to Step 11 |
9 | Test the A/C pressure sensor low reference circuit for a high resistance or open circuit condition. Refer to Testing for Intermittent Conditions and Poor Connections for information on electrical fault diagnosis. Was any fault found and rectified? | -- | Go to Step 12 | Go to Step 11 |
10 | Replace the A/C pressure sensor. Refer to Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement. Was the repair completed? | -- | Go to Step 12 | -- |
11 | Replace the PCM. Refer to Powertrain Control Module Replacement. Was the repair completed? | -- | Go to Step 12 | -- |
12 |
Do any of the A/C refrigerant pressure sensor circuit DTCs fail this ignition cycle? | -- | Go to Step 2 | Go to Step 13 |
13 | Using Tech 2, select the DTC Display function. Are there any DTCs displayed? | -- | Go to the appropriate DTC Table | System OK |
When all diagnosis and repairs are completed, check the engine management system for correct operation. | ||||
