Circuit Description
The A/C refrigerant pressure sensor responds to changes in A/C refrigerant high side pressure. The system consists of a 5-volt reference circuit, a signal circuit 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 0-450 psi. At 0 psi the signal voltage will be about 0.1 volt, varying to 4.9 volts at 450 psi or above.
Conditions for Setting
| • | The intake air temperature is greater than 0°C (32°F). |
| • | The A/C refrigerant sensor pressure is greater than 4.9 volts with the clutch ON. |
| • | One or both of the following DTCs are not set; P0112 or P0113. |
| OR |
| • | The A/C refrigerant sensor pressure is greater than 3.98 volts with the clutch OFF. |
| • | One or both of the following DTCs are not set; P0112 or P0113. |
Action Taken
The PCM will disable the A/C compressor clutch.
Conditions for Clearing the MIL/DTC
| • | A history DTC P0530 will clear after 40 consecutive ignition cycles have occurred without a fault. |
| • | History and current DTC P0530 can be cleared by using a scan tool. |
Diagnostic Aids
DTC P0530 will set on non A/C equipped vehicles if CKT 451 is open or shorted to B+.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics | ||||
1 | Was the On-Board Diagnostic (OBD) System Check performed? | -- | Go to Step 2 | |
2 |
Does the A/C highside value read greater than the specified value? | 3.9 V | Go to Step 4 | Go to Step 3 |
3 | Is the A/C highside voltage less than the specified value? | 0.28 V | Go to Step 5 | Go to Diagnostic Aids |
4 | Disconnect the A/C refrigerant pressure sensor electrical connector. Does the A/C highside value read less than the specified value? | 1 V | Go to Step 7 | Go to Step 11 |
5 |
Does the scan tool A/C highside value read greater than the specified value? | 4.6 V | Go to Step 9 | Go to Step 6 |
6 |
Does the voltage read greater than the specified value? | 4.6 V | Go to Step 10 | Go to Step 8 |
7 | Connect a test light to B+ and to the A/C sensor ground circuit on the PCM side. Does the test light illuminate? | -- | Go to Step 9 | Go to Step 11 |
8 | Repair the open in the 5-volt reference circuit. Is the action complete? | -- | -- | |
9 | Replace the A/C refrigerant pressure sensor. Is the action complete? | -- | -- | |
10 |
Was a repair necessary? | -- | Go to Step 12 | |
11 |
Was a repair necessary? | -- | Go to Step 12 | |
12 | Replace the PCM. Is the action complete? | -- | -- | |
