DTC Troubleshooting: P0532 (191)
DTC P0532:
 A/C pressure sensor Circuit Low Voltage
NOTE: Before you troubleshoot, record all freeze data 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 0.3 V or less?
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.■
  1. Turn the ignition switch OFF.
  1. Disconnect the A/C pressure sensor 3P connector.
  1. Turn the ignition switch ON (II).
  1. Check the A/C PRESSURE SENSOR in the DATA LIST with the HDS.
Is there about 0.3 V or less?
YES -
Go to Step 10 .
NO -
Go to Step 9 .
  1. Measure voltage between A/C pressure sensor 3P connector terminals No. 1 and No. 3.
Is there about 5 V?
YES -
Go to Step 17 .
NO -
Go to Step 13 .
  1. Turn the ignition switch OFF, and wait 2 minutes.
  1. Disconnect ECM connector No. 1 (96P).
  1. Check for continuity between A/C pressure sensor 3P connector terminal No. 2 and body ground.
Is there continuity?
YES -
Repair short in the wire between the A/C pressure sensor and ECM connector No. 1 terminal No. 18, then go to Step 19 .
NO -
Go to Step 26 .
  1. Turn the ignition switch OFF, and wait 2 minutes.
  1. Disconnect ECM connector No. 2 (58P).
  1. Connect A/C pressure sensor 3P connector terminal No. 1 to body ground with a jumper wire.
  1. Check for continuity between ECM connector No. 2 terminal No. 13 and body ground.
Is there continuity?
YES -
Go to Step 26 .
NO -
Repair open in the wire between the A/C pressure sensor and ECM connector No. 2 terminal No. 13, then go to Step 19 .
  1. Turn the ignition switch OFF.
  1. Reconnect all connectors.
  1. Turn the ignition switch ON (II).
  1. Reset the ECM 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 P0532 indicated?
YES -
Check for poor connections or loose terminals at the A/C pressure sensor and the ECM, 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 P0532 indicated?
YES -
Check for poor connections or loose terminals at the A/C pressure sensor and the ECM. If the ECM was updated, substitute a known-good ECM, then go to Step 28 . If the ECM was substituted, go to Step 1 .
NO -
If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■