A/C CUT-OFF CONTROL [SKYACTIV-G 1.5, SKYACTIV-G 2.0]

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Outline

• To improve drive performance and A/C compressor reliability, the A/C relay is turned off at the appropriate timing (according to the engine operation conditions), and the A/C operation is controlled.

Block Diagram

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Operation

• The PCM stops current to the A/C relay when any of the following conditions are met:

A/C cut-off control operation conditions

—: Not applicable

Operation condition	While A/C relay not energized	Purpose
At engine start	Approx. 4 s	Improved startability
When engine is restarted by i-stop control	Approx. 3 s	Improved startability
When high engine speed (approx. 6,700 rpm or more)	—	A/C compressor reliability assurance
Accelerated	Approx. 5 s	Acceleration from standstill/acceleration performance improvement
Time under i-stop control, vehicle speed of 1 km/h {0.6 mph} or less	—	i-stop function reliability improvement
Refrigerant pressure 3.14 MPa {32.0 kgf/cm², 455 psi} or more	—	A/C compressor reliability assurance
Refrigerant pressure of 0.196 MPa {2.00 kgf/cm², 28.4 psi} or less continues for 5 s or more	—	A/C compressor reliability assurance
Drive-by-wire control malfunction	—	Reverse driving performance assurance
Panic braking determined	—	Load performance assurance
ECT sensor malfunction	—	Engine protection
When high engine coolant temperature (approx. 113 °C {235 °F} or more)	Cuts off the A/C intermittently, and if the engine coolant temperature does not decrease, cuts off the A/C continuously.	Engine protection
Travel on ascending road	—	Ascent performance improvement