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Circuit Description

The A/C pressure sensor (located on A/C high pressure side) is used by the Powertrain Control Module (PCM) and Dash Integration Module (DIM) to monitor A/C pressure. DIM uses this information to command engine cooling fans to turn on when A/C pressure is high and to keep A/C compressor disengaged when refrigerant pressure is excessively high or low.

PCM applies a 5-volt reference and a sensor ground. Changes in A/C refrigerant pressure will cause A/C pressure signal input to PCM to vary. PCM monitors A/C refrigerant pressure circuit and can determine when signal is out of range. When signal is out range for a period to time, PCM will set. When A/C pressure is greater than 430 psi (30 kg/cm2 ), A/C compressor clutch will not engage.

Conditions for setting DTC:

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