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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 97 (HVAC Systems - Manual) >> Diagnostic Information and Procedures >> DTC P0530, P0532 Or P0533 >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The engine control module (ECM)/powertrain control module (PCM) monitors the high side refrigerant pressure via the A/C refrigerant pressure sensor. The ECM/PCM applies a 5-volt reference and a low reference to the sensor. Changes in the A/C refrigerant pressure cause the A/C refrigerant pressure sensor signal to the ECM/PCM to vary. When the pressure is high the signal voltage is high. When the pressure is low the signal voltage is low. When pressure is high the ECM/PCM commands the cooling fans on. When pressure is too high or too low the ECM/PCM will not allow the A/C compressor clutch to engage. When the DTC is set, the ECM/PCM does not allow the A/C compressor clutch to engage. This is done to protect the compressor.

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