DTC Advanced Diagnostics: P0533

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 higher than the expected voltage for a set time, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status

Execution	Continuous
Sequence	None
Duration	10 seconds or more
DTC Type	Two drive cycles, MIL off
OBD Status	PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Enable Conditions

Condition
Vehicle	ON mode
No active DTCs set (prevents monitor from running)	P0532

Malfunction Threshold

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.

	A/C pressure sensor failure
	A/C pressure sensor PD SENSOR line open
	A/C pressure sensor SG line open
	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.