HVAC System - Automatic

DTC P0532 or P0533

Circuit Description

The engine control module (ECM) monitors the high side refrigerant pressure via a A/C refrigerant pressure sensor. When the pressure is high the signal voltage is high. When the pressure is low the signal voltage is low. When pressure is too high the powertrain control module (PCM) will not allow the A/C compressor clutch to engage.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0530 Air Conditioning Refrigerant Pressure Sensor Circuit

Conditions for Running the DTC

The ECM detects an A/C request.

Conditions for Setting the DTC

* The A/C refrigerant pressure sensor signal is less than 0.1 volts for 5 seconds.
* The A/C refrigerant pressure sensor signal is greater than 4.9 volts for 5 seconds.

Action Taken When the DTC Sets

The malfunction indicator lamp (MIL) will not illuminate.

Conditions for Clearing the DTC

* The DTC will become history if the ECM no longer detects a failure.
* The history DTC will clear after 40 fault-free ignition cycles.
* The DTC can be cleared with a scan tool.

Diagnostic Aids

For an intermittent, Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics

Test Description

Step 1 - Step 8:

Step 9 - Step 13:

The number below refers to the step number on the diagnostic table.
5. This step tests the ability of the A/C refrigerant pressure sensor to create a voltage signal for the ECM to monitor the A/C refrigerant pressure. Measure the voltage at the A/C refrigerant pressure sensor, if the voltage is measured at the connector for the sensor, misdiagnosis will occur.