Honda Pilot: A/C System Description - A/C Pressure Sensor

The A/C pressure sensor is attached to a receiver pipe of the A/C condenser exit side. This sensor uses the sensor that the output voltage changes by the pressure. PCM receives the voltage signal and is used to drive the A/C compressor. When the A/C system pressure rises to an upper limit, or decreases to a lower limit, PCM stops the A/C compressor to protect the system.

• Upper limit: 3,138 kPa (32.00 kgf/cm2 , 455.1 psi)
• Lower limit: 196 kPa (2.00 kgf/cm2 , 28.4 psi)
• High speed fans switch point: 1,700 kPa (17.33 kgf/cm2 , 246.6 psi)

NOTE: This illustration is an example only. The appearance and structure of the actual parts may vary depending on the model.

A/C System Description - Compressor

A/C Compressor

The A/C compressor is a pump that compresses a refrigerant. It is driven by the engine accessory drive belt. When the compressor clutch is OFF, the rotor pulley and armature plate are disconnected and the compressor does not operate. When the compressor clutch is ON, the field coil is energized, creating a strong magnetic field. This magnetic field locks the rotor pulley and armature plate together, driving the compressor. The compressed refrigerant becomes a high pressure and high temperature vapor that is sent to the A/C condenser.

A/C compressor has a mechanical relief valve, and the valve opens when pressure exceeds the rated value. It cannot be reused, and should be replaced.

NOTE: This illustration is an example only. The appearance and structure of the actual parts may vary depending on the model.

12 Volt Battery System Description - Control/FunctionA/C System Description - Condenser