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
      

1.
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
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.?
2.
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
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
     
     
     
3.
Determine possible failure area (SG6 line, others):

Determine possible failure area (SG6 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.
4.
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, and wait more than 1 minute.


?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.?
5.
Open wire check (SG6 line):

Open wire check (SG6 line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS, and wait more than 1 minute.


?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. 28


Is there continuity?

     
YES
     
     
     
The SG6 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 SG6 wire between the PCM (A28) and the A/C pressure sensor.?