A/C CUT-OFF CONTROL [SKYACTIV-G 2.5T]

id0140h0206200


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. 10 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
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