P0532

DTC P0532 or P0533

Circuit Description

The air conditioning (A/C) refrigerant pressure sensor is used by the engine control module (ECM) to monitor the high side refrigerant pressure. The A/C refrigerant pressure sensor utilizes the following 3 circuits:

* A 5-volt reference circuit
* A low reference circuit
* A signal circuit

The ECM monitors the signal circuit voltage. If the A/C high side pressure is high, the signal voltage is high. If the A/C high side pressure is low, the signal voltage is low. The ECM uses the voltage readings to determine the operation of the A/C compressor and the cooling fans. If the ECM detects an excessively high or low signal voltage, a DTC sets.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

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

Conditions for Running the DTC

* The engine is running.
* The A/C is requested.
* DTC P0532 and P0532 run continuously once the above condition is met.

Conditions for Setting the DTC

P0532
* The ECM detects that the A/C pressure is less than 0.1 volt.
* The condition exists for more than 10 seconds.

P0533
* The ECM detects that the A/C pressure is more than 4.9 volts.
* The condition exists for more than 10 seconds.

Action Taken When the DTC Sets

* The control module stores the DTC information into memory when the diagnostic runs and fails.
* The malfunction indicator lamp (MIL) will not illuminate.
* The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
* The driver information center, if equipped, may display a message.

Conditions for Clearing the DTC

* A current DTC Last Test Failed clears when the diagnostic runs and passes.
* A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
* Clear the DTC with a scan tool.

Diagnostic Aids

* For HVAC system concerns, refer to HVAC Preliminary Checks (Initial Inspection and Diagnostic Overview).
* For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics).