Compressor Control System

In the automatic air-conditioning mode, the A/C relay is activated or deactivated depending on the TAO (required blow-out air temperature), TAM (ambient temperature) and T INT (suction air temperature) to operate or stop the compressor.

The compressor operation circuit supplies current to the magnet clutch as the ECM activates the A/C relay by connecting its coil to the ground.

Fig 1: Identifying Compressor Operation Circuit Diagram

Courtesy of SUBARU OF AMERICA, INC.

• Control by TAO and TAM
  Fig 2: Identifying Compressor Operation Control By TAO & TAM Operation Graph

  Courtesy of SUBARU OF AMERICA, INC.
• Control by T INT
  Fig 3: Identifying Compressor Operation Control By T INT

  Courtesy of SUBARU OF AMERICA, INC.