General Information

Engine Control
P0533 A/C Refrigerant Pressure Sensor - General Information

Component Location





General Description

The PCM monitors the A/C Refrigerant Pressure Sensor. The A/C Pressure Sensor is placed on the high pressure line. This signal indicates how much load the A/C compressor is putting on the engine and is one of the factors used by the PCM in order to determine the idle air control position for the idle speed. The signal is a voltage which is proportional to the A/C pressure from 0 to 5V. Low pressure produces a low voltage signal and high pressure a high-voltage signal.

DTC Description

PCM monitors output signals from A/C pressure sensor. If a signal is above 4.65V for more than 10 seconds, the PCM sets a P0533 DTC.

DTC Detecting Condition





Diagnostic Circuit Diagram





Signal Waveform & Data












Fig.1) Normal waveforms of A/C pressure sensor during the time from turning A/C "ON" switch to turning A/C "OFF" switch.
Fig.2) Normal data of A/C pressure sensor without A/C switch ON.
Fig.3) Abnormal data of A/C pressure sensor when A/C pressure sensor circuit open.