A/C CUT-OFF CONTROL [SKYACTIV-G 2.0, SKYACTIV-G 2.5]

id0140g2206200

Caution
•  Vehicle specifications differ depending on the vehicle identification number (VIN).
―  Type A VIN:
JM0 KE****** 100001−
JM6 KE****** 100001−
JM7 KE****** 100001−
JM8 KE****** 100001−
JMZ KE****** 100001−
KE10** 100001−
―  Type B VIN:
JM0 KE****** 200001−
JM6 KE****** 200001−
JM8 KE****** 200001−
JMZ KE****** 200001−
KE10** 200001−

Outline

•  Controls the A/C operation by switching the A/C relay ON/OFF at the optimal timing according to engine operation conditions. Acceleration performance and A/C compressor reliability have been improved by controlling the A/C operation.

Block Diagram

ac5wzn00001585

Operation (Type A VIN)

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

A/C cut-off control operation conditions

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 engine speed is 6,700 rpm or more
Approx. 5 s elapsed since engine speed was 6,200 rpm or less
A/C compressor reliability assurance
Accelerated
3 to 5 s
Acceleration from standstill/acceleration performance improvement
Time under i-stop control, vehicle speed of 1km/h {0.6 mph} or less
—
i-stop function reliability 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
Misfire determination
—
Catalytic converter protection
ECT sensor malfunction
—
Engine protection
Engine coolant temperature 113 °C {235 °F} or more
Turns on/off repeatedly every 10 s until engine coolant temperature is less than approx. 107 °C {225 °F}
Engine protection
Engine coolant temperature 117 °C {243 °F} or more
Until engine coolant temperature is less than 110 °C {230 °F}
Engine protection


Operation (Type B VIN)

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

A/C cut-off control operation conditions

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)
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
Time under i-stop control, vehicle speed of 1km/h {0.6 mph} or less
—
i-stop function reliability 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 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