DTC Troubleshooting

Control System DTCs

DTC Troubleshooting: P0532

DTC P0532 : A/C Pressure Sensor Circuit Low Voltage

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information How to Troubleshoot the Fuel And Emissions Systems.


1. 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.





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 (PD SENSOR line, others):

-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connector.





-3. Turn the ignition switch to ON (II).

-4. Check the parameter(s) below with the HDS.





Do the current condition(s) match the threshold?
-YES- Go to step 5.
-NO- Go to step 3.

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

-1. Measure the voltage between test points 1 and 2.









Is there about 5.0 V?
-YES- Replace the A/C pressure sensor Service and Repair, then do the repair verification.
-NO- Go to step 4.

4. Open wire check (VCC6 line):

-1. Turn the ignition switch to LOCK (0).

-2. Jump the SCS line with the HDS.

-3. Disconnect the following connector.





-4. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- The VCC6 wire is OK. Update the PCM PCM Update if it does not have the latest software, or substitute a known-good PCM Service and Repair, then do the repair verification.
-NO- Repair an open in the VCC6 wire between the PCM (A30) and the A/C pressure sensor, then do the repair verification.

5. Shorted wire check (PD SENSOR line):

-1. Turn the ignition switch to LOCK (0).

-2. Jump the SCS line with the HDS.

-3. Disconnect the following connector.





-4. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- Repair a short in the PD SENSOR wire between the PCM (A27) and the A/C pressure sensor, then do the repair verification.
-NO- The PD SENSOR wire is OK. Update the PCM PCM Update if it does not have the latest software, or substitute a known-good PCM Service and Repair, then do the repair verification.

Repair verification:

-1. Turn the ignition switch to LOCK (0).

-2. Reconnect all connectors.

-3. Turn the ignition switch to ON (II).

-4. Reset the PCM with the HDS How to Troubleshoot the Fuel And Emissions Systems.

-5. Do the PCM idle learn procedure PCM Idle Learn Procedure.

-6. Start the engine, and let it idle.

-7. Turn the blower switch on.

-8. Turn the A/C switch on.

-9. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P0532 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 Service and Repair, then recheck. If the PCM was substituted, go to step 1.
-NO- Troubleshooting is complete. If the PCM was substituted, replace the original PCM Service and Repair. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.