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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1104 (HVAC Systems - Automatic) >> Diagnostic Information and Procedures >> DTC P0530, P0532, or P0533: Air Conditioning (A/C) Refrigerant Pressure Sensor Signal Circuit Too Low or Too High >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The powertrain control module (PCM) or engine control module (ECM) monitors the high side refrigerant pressure via a air conditioning (A/C) refrigerant pressure sensor. The PCM/ECM supplies 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 PCM/ECM 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 PCM commands the cooling fans on. When pressure is too high or too low the PCM/ECM will not allow the A/C compressor clutch to engage.

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