DTC Troubleshooting: P0533
DTC P0533: A/C Pressure Sensor Circuit High Voltage
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and 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.?
2.
Determine possible failure area (A/C pressure sensor, others):

Determine possible failure area (A/C pressure sensor, others)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connector.

?3.
Connect terminals A and B with a jumper wire.
Terminal A
A/C pressure sensor 3P connector No. 1 (BLU)
Terminal B
A/C pressure sensor 3P connector No. 2 (RED)


?4.
Press the engine start/stop button to select 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
     
     
     
Replace the A/C pressure sensor, then do the repair verification.
3.
Determine possible failure area (PD SENSOR line, SG6 line):

Determine possible failure area (PD SENSOR line, SG6 line)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Remove the jumper wire.

?3.
Press the engine start/stop button to select the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
ON mode
 
A/C pressure sensor 3P connector: disconnected
Test circuit
SG6, VCC6
Test point 1
A/C pressure sensor 3P connector No. 1 (BLU)
Test point 2
A/C pressure sensor 3P connector No. 3 (BRN)


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.
Press the engine start/stop button to select the OFF mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connector.

?4.
Check for continuity between test points 1 and 2.
Test condition
OFF mode
 
A/C pressure sensor 3P connector: disconnected
 
PCM connector A (51P): disconnected
Test circuit
PD SENSOR
Test point 1
A/C pressure sensor 3P connector No. 2 (RED)
Test point 2
PCM connector A (51P) No. 47 (RED)


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 do the repair verification.
     
NO
     
     
     
Repair an open in the PD SENSOR wire between the PCM (A47) and the A/C pressure sensor, then do the repair verification.
5.
Open wire check (SG6 line):

Open wire check (SG6 line)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connector.

?4.
Check for continuity between test points 1 and 2.
Test condition
OFF mode
 
A/C pressure sensor 3P connector: disconnected
 
PCM connector A (51P): disconnected
Test circuit
SG6
Test point 1
A/C pressure sensor 3P connector No. 1 (BLU)
Test point 2
PCM connector A (51P) No. 20 (BLU)


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 do the repair verification.
     
NO
     
     
     
Repair an open in the SG6 wire between the PCM (A20) and the A/C pressure sensor, then do the repair verification.
Repair verification:

?1.
Press the engine start/stop button to select the OFF mode.

?2.
Reconnect all connectors.

?3.
Exit the SCS mode with the HDS.


?4.
Press the engine start/stop button to select the ON mode.

?5.
Reset the PCM with the HDS.


?6.
Do the PCM idle learn procedure.

?7.
Start the engine, and let it idle.

?8.
Turn the blower switch on.

?9.
Turn the A/C switch on.

?10.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0533 A/C Pressure Sensor Circuit High Voltage
      


Is DTC P0533 indicated?

     
YES
     
     
     
Check for poor connections or loose terminals at the A/C pressure sensor and the PCM. If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to step 1.
     
NO
     
     
     
Troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.?