DTC Troubleshooting: P0533

DTC P0533: A/C Pressure Sensor Circuit High Voltage

NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
P0533 A/C Pressure Sensor Circuit High Voltage

Problem verification:

Problem verification

?1.	Start the engine, and let it idle.

?2.	Turn the blower switch on.

?3.	Turn the A/C switch on.

?4.

Check the parameter(s) below with the HDS.

Signal	Threshold		Current conditions
Signal	Values	Unit	Values	Unit
A/C PRESSURE SENSOR	More than 4.75	V

Do the current condition(s) match the threshold?


	YES

The failure is duplicated. Go to step 2.


	NO

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/C pressure sensor and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.?

Determine possible failure area (A/C pressure sensor, others):

Determine possible failure area (A/C pressure sensor, others)

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.

Disconnect the following connector.

A/C pressure sensor 3P connector

?3.

Connect terminals A and B with a jumper wire.

Terminal A	A/C pressure sensor 3P connector No. 1
Terminal B	A/C pressure sensor 3P connector No. 2

?4.	Turn the vehicle to the ON mode.

?5.

Check the parameter(s) below with the HDS.

Signal	Threshold		Current conditions
Signal	Values	Unit	Values	Unit
A/C PRESSURE SENSOR	More than 4.75	V

Do the current condition(s) match the threshold?


	YES

Go to step 3.


	NO

Replace the A/C pressure sensor.?

Determine possible failure area (SG5 line, others):

Determine possible failure area (SG5 line, others)

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.	Remove the jumper wire from the A/C pressure sensor 3P connector.

?3.	Turn the vehicle to the ON mode.

?4.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	A/C pressure sensor 3P connector: disconnected
Test point 1	A/C pressure sensor 3P connector No. 1
Test point 2	A/C pressure sensor 3P connector No. 3

Is there about 5.0 V?


	YES

Go to step 4.


	NO

Go to step 5.

Open wire check (PD SENSOR line):

Open wire check (PD SENSOR line)

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.	Jump the SCS line with the HDS.

?3.

Disconnect the following connector.

PCM connector A (51P)

?4.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	A/C pressure sensor 3P connector: disconnected
	PCM connector A (51P): disconnected
Test point 1	A/C pressure sensor 3P connector No. 2
Test point 2	PCM connector A (51P) No. 41

Is there continuity?


	YES

The PD SENSOR wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If DTC P0533 goes away and the PCM was updated, troubleshooting is complete. If DTC P0533 goes away and the PCM was substituted, replace the original PCM.?


	NO

Repair an open in the PD SENSOR wire between the PCM (A41) and the A/C pressure sensor.?

Open wire check (SG5 line):

Open wire check (SG5 line)

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.	Jump the SCS line with the HDS.

?3.

Disconnect the following connector.

PCM connector A (51P)

?4.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	A/C pressure sensor 3P connector: disconnected
	PCM connector A (51P): disconnected
Test point 1	A/C pressure sensor 3P connector No. 1
Test point 2	PCM connector A (51P) No. 39

Is there continuity?


	YES

The SG5 wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If DTC P0533 goes away and the PCM was updated, troubleshooting is complete. If DTC P0533 goes away and the PCM was substituted, replace the original PCM.?


	NO

Repair an open in the SG5 wire between the PCM (A39) and the A/C pressure sensor.?