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V70 XC AWD L5-2.4L Turbo VIN 56 B5254T (1998)

Powertrain Management > Computers and Control Systems > A/C Signal > Component Information > Description and Operation > A/C Relay > Page 3098

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A/C Signal: Description and Operation
A/C Pressure Sensor

A/C Pressure Sensor

A/C PRESSURE SENSOR

The A/C pressure sensor, which is of a new type delivering a linear signal, supplies the ECM with information regarding the pressure in the A/C high
pressure circuit.

The purpose is to control the following functions:
^

Starting of the engine cooling fan at low speed

^

Starting of the engine cooling fan at high speed

^

Switch-out of the A/C compressor if the system pressure becomes excessive

^

Idling compensation for A/C load (only normally aspirated engine)

The sensor is supplied at 5 Volts by the ECM. The sensor signal may vary from 0 to 5 Volts, depending on the system pressure. Low pressure
produces a low- voltage signal and high pressure a high-voltage signal.

The sensor is installed in the A/C high-pressure circuit.

Powertrain Management > Computers and Control Systems > A/C Signal > Component Information > Description and Operation > A/C Relay > Page 3098

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