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.
A/C cut-off control operation conditions
The PCM stops current to the A/C relay when any of the following conditions are met:
| Operation condition | While A/C relay not energized | Purpose |
| At engine start | Approx. 4 s | Improved startability |
| When high engine speed (approx. 6,700 rpm or more) | Approx. 5 s elapsed since engine speed was 6,200 rpm or less | A/C compressor reliability assurance |
| Accelerated | Approx. 5 s | Acceleration from standstill/acceleration performance improvement |
| Refrigerant pressure 3.14 MPa {32.0 kgf/cm2, 455 psi} or more | Refrigerant pressure decreases to 2.55 MPa {26.0 kgf/cm2, 370 psi} or less | 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 | Refrigerant pressure of 0.226 MPa {2.30 kgf/cm2, 32.8 psi} or more continues to 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 No.1 malfunction | — | Engine protection |
| When high engine coolant temperature (approx. 113 °C {235 °F} or more) | High engine coolant temperature: Continuously cuts off the A/C, and if the engine coolant temperature decreases, it continues to cut-off the A/C. | Engine protection |
| Travel on ascending road | — | Ascent performance improvement |