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.
  1. Start the engine, and let it idle.
  1. Turn the blower switch on.
  1. Turn the A/C switch on.
  1. Check the A/C PRESSURE SENSOR in the DATA LIST with the HDS.
Is there about 4.75 V or more?
YES -
Go to Step 5 .
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 ECM/PCM.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the A/C pressure sensor 3P connector.
  1. Connect A/C pressure sensor 3P connector terminals No. 2 and No. 3 with a jumper wire.
  1. Turn the ignition switch to ON (II).
  1. Check the A/C PRESSURE SENSOR in the DATA LIST with the HDS.
Is there about 4.75 V or more?
YES -
Go to Step 10 .
NO -
Go to Step 22 .
  1. Turn the ignition switch to LOCK (0).
  1. Remove the jumper wire from the A/C pressure sensor 3P connector.
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between A/C pressure sensor 3P connector terminals No. 1 and No. 3.
Is there about 5 V?
YES -
Go to Step 14 .
NO -
Go to Step 18 .
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM/PCM connector A (44P).
  1. Check for continuity between A/C pressure sensor 3P connector terminal No. 2 and ECM/PCM connector terminal A16.
Is there continuity?
YES -
Go to Step 32 .
NO -
Repair open in the wire between the ECM/PCM (A16) and the A/C pressure sensor, then go to Step 24 .
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM/PCM connector A (44P).
  1. Check for continuity between A/C pressure sensor 3P connector terminal No. 3 and ECM/PCM connector terminal A9.
Is there continuity?
YES -
Go to Step 32 .
NO -
Repair open in the wire between the ECM/PCM (A9) and the A/C pressure sensor, then go to Step 24 .
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect all connectors.
  1. Turn the ignition switch to ON (II).
  1. Reset the ECM/PCM with the HDS.
  1. Start the engine, and let it idle.
  1. Turn the blower switch on.
  1. Turn the A/C switch on.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0533 indicated?
YES -
Check for poor connections or loose terminals at the A/C pressure sensor and the ECM/PCM, then go to Step 1 .
NO -
Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■
  1. Reconnect all connectors.
  1. Start the engine, and let it idle.
  1. Turn the blower switch on.
  1. Turn the A/C switch on.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0533 indicated?
YES -
Check for poor connections or loose terminals at the A/C pressure sensor and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to Step 33 . If the ECM/PCM was substituted, go to Step 1 .
NO -
If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■