P0530- A/C PRESS SENSOR CIRCUIT VOLTAGE TOO LOW
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With the ignition on.
- Set Condition:
The A/C Pressure Sensor Signal is below 0.06 volt for 0.6 second.
| Possible Causes |
| 5-VOLT SUPPLY CIRCUIT OPEN |
| BCM - A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE |
| BCM - A/C PRESSURE SENSOR SIGNAL SHORT TO GROUND |
| A/C PRESSURE SENSOR FAILURE |
| A/C PRESSURE SENSOR SIGNAL CIRCUIT OPEN |
| A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND |
| A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND |
| A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE |
| SENSOR GROUND CIRCUIT OPEN |
| INTERMITTENT CONDITION |
Diagnostic Test
1. CHECKING FOR CURRENT DTCNOTE: If DTC P0641 or P0651 is present with this DTC, diagnose DTCs P0641 and P0651 before diagnosing this DTC.
NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Start the engine several times, letting the engine run for at least 30 seconds at a time.
With the scan tool, read ECM DTCs.
Did this DTC set again?
Yes
- Go To2
No
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
2. CHECKING A/C SENSOR SIGNAL CKT
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Turn the ignition on.
Measure the voltage of the A/C Pressure Sensor Signal circuit.
Select the appropriate voltage reading.
Voltage is above 5.5 volts.
- Go To3
Voltage is between 4.7 and 5.4 volts.
- Go To4
Voltage is below 4.7 volts.
- Go To6
3. A/C SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the BCM harness connectors.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector.
Turn the ignition on.
Measure the voltage of the A/C Pressure Sensor Signal circuit.
Is the voltage below 1.0 volt?
Yes
- Replace and program the Body Control Module in accordance with the Service Information.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Repair the A/C Pressure Sensor Signal circuit for a short to voltage.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
4. 5-VOLT SUPPLY CIRCUIT OPEN
Turn the ignition off.
Disconnect the BCM harness connectors.
Measure the resistance of the 5-Volt Supply circuit between the BCM harness connector and the A/C Pressure Sensor harness connector.
Is the resistance below 10.0 ohms?
Yes
- Go To5
No
- Repair the 5-Volt Supply circuit for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
5. SENSOR GROUND CKT OPEN
Measure the resistance of the Sensor Ground circuit.
Is the resistance below 10.0 ohms?
Yes
- Replace the A/C Pressure Sensor.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Repair the Sensor Ground circuit for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
6. A/C SENSOR SIGNAL CKT OPEN
Turn the ignition off.
Disconnect the BCM harness connectors.
Measure the resistance of the A/C Pressure Sensor Signal circuit.
Is the resistance below 10.0 ohms?
Yes
- Go To7
No
- Repair the A/C Pressure Sensor Signal circuit for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
7. A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the A/C Pressure Sensor Signal circuit.
Is the resistance above 1000 ohms?
Yes
- Go To8
No
- Repair the A/C Pressure Sensor Signal circuit for a short to ground.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
8. A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND
Measure the resistance between Sensor Ground and the A/C Pressure Sensor Signal circuit.
Is the resistance above 1000 ohms?
Yes
- Replace and program the Body Control Module in accordance with the Service Information.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Repair the A/C Pressure Sensor Signal circuit for a short to the Sensor Ground circuit.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).