HVAC System - Manual

DTC P0532 or P0533

Circuit Description

The powertrain control module (PCM) or 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 high the PCM/ECM commands the cooling fans on. When pressure is too high or too low the PCM/ECM will not allow the A/C compressor clutch to engage.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

* P0532 Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit Low Voltage
* P0533 Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit High Voltage

Conditions for Running the DTC

* The engine is running.
* A/C has been requested.

Conditions for Setting the DTC

* The PCM/ECM detects the signal circuit is less than 5 counts (0.09 volt) or more than 250 counts (4.90 volts).
* The condition exists for 20 seconds.

Action Taken When the DTC Sets

* The PCM/ECM will not illuminate the malfunction indicator lamp (MIL).
* The PCM/ECM stores the failure records.
* The A/C compressor clutch is disabled.

Conditions for Clearing the DTC

* The DTC will become history if the PCM/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

If the condition is not present refer to Testing for Intermittent Conditions and Poor Connections in Diagnostic Aids. Component Tests and General Diagnostics

Test Description

Step 1 - Step 9:

Step 10 - Step 17:

The numbers below refer to the step numbers on the diagnostic table:
4. If the pressure signal voltage stays high after disconnecting the pressure sensor electrical connector, the signal circuit is shorted to voltage, or the PCM/ECM is faulty.
7. Tests for a high resistance or for an open in the ground circuit.
16. This vehicle is equipped with a PCM/ECM which utilizes an electrically erasable programmable read only memory (EEPROM). Before you replace the PCM/ECM, program the new PCM/ECM.