DTC Advanced Diagnostics: P0532, P0533
DTC P0532:A/C Pressure Sensor Circuit Low Voltage
DTC P0533:A/C Pressure Sensor Circuit High Voltage

General Description


The A/C pressure sensor measures the change in the pressure of the air conditioning refrigerant. The signal from the A/C pressure sensor is low voltage at low pressure (when the air conditioning load is low) and high voltage at high pressure (when the air conditioning load is high). The powertrain control module (PCM) compares the expected voltage to the A/C pressure sensor output voltage. When the A/C pressure sensor output voltage is lower or higher than the expected voltage for a set time, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Continuous
Sequence
None
Duration
10 seconds or more
DTC Type
Two drive cycles, MIL off

Enable Conditions
Condition
 
Vehicle
ON mode

Malfunction Threshold
DTC: P0532

The A/C pressure sensor output voltage [A/C PRESSURE SENSOR] is 0.24 V or less for at least 10 seconds.

DTC: P0533

The A/C pressure sensor output voltage [A/C PRESSURE SENSOR] is 4.76 V or more for at least 10 seconds.

[ ]: HDS Parameter

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
DTC: P0532
A/C pressure sensor PD SENSOR line short to ground
A/C pressure sensor VCC line open

DTC: P0533
A/C pressure sensor PD SENSOR line open
A/C pressure sensor SG line open

Common
A/C pressure sensor failure
PCM internal circuit failure

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, a Confirmed DTC and the freeze data are stored. The MIL does not come on.

Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.