P0530- A/C PRESS SENSOR CIRCUIT VOLTAGE TOO HIGH

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the ignition on.
Set Condition:
The A/C Pressure Sensor Signal is above 4.74 volts 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 DTC

NOTE: 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.

Did this DTC set again?

Yes

Go To2

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

2.CHECKING A/C SENSOR SIGNAL CKT

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

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).

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

Is the resistance below 10.0 ohms?

Yes

Go To5

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

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).

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

Is the resistance below 10.0 ohms?

Yes

Go To7

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

Is the resistance above 1000 ohms?

Yes

Go To8

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

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).

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).