AIR CONDITIONER i-stop CONTROL [MANUAL AIR CONDITIONER]
id0740a2126800
Purpose
• The heater control unit controls i-stop to permit/inhibit its operation (engine stop control) according to the air conditioner system operation conditions.
Function
• The climate control unit determines i-stop control according to the operation condition of the air conditioner system and sends i-stop request signals to the front body control module (FBCM).
Operation
i-stop request control (i-stop (engine stop control) permit/ i-stop (engine stop control) inhibit)
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• The climate control unit sends i-stop (engine stop control) permit or inhibit request signals to the front body control module (FBCM) according to the operation condition of the air conditioner system.
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i-stop (engine stop control) inhibit request
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• The climate control unit sends an i-stop (engine stop control) inhibit request signal to the front body control module (FBCM) when it detects any of the following conditions:
i-stop (engine stop control) inhibit conditions
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No.
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Item
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Vehicle condition
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1
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• Airflow mode
• Blower motor
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When all of the following conditions have been met, i-stop (engine stop control) inhibit is determined:
• Airflow mode during defrost
• Blower motor is ON
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2
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Ambient temperature
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Ambient temperature is -10 °C {14 °F} or below, or 50 °C {122 °F} or more
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3
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Engine coolant temperature
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When all of the following conditions are met, i-stop (engine stop control) inhibit is determined:
• Engine coolant temperature signal is the specified value or less for i-stop (engine stop control) permit conditions
• Blower motor is ON
• Ambient temperature is 9 °C {48 °F}or less
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4
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Evaporator temperature
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When all of the following conditions have been met, i-stop (engine stop control) inhibit is determined:
• Evaporator signal is the specified value or less for i-stop (engine stop control) permit conditions
• A/C is ON
• Ambient temperature is 30 °C {86 °F} or more
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i-stop (engine stop control) permit request
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• When the heater control unit sends an i-stop (engine stop control) permit signal to the front body control module (FBCM) if the i-stop (engine stop control) inhibit conditions are not detected.
A/C control start during i-stop (engine stop control)
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• If the climate control unit determines that the engine is stopped based on an i-stop status signal sent from the PCM when A/C is stopped by i-stop control, the climate control unit starts A/C control in conjunction with the engine stop condition.
• If the engine is stopped during A/C control, the A/C compressor magnetic clutch turns off and the A/C indicator light remains in an illuminated condition. When the engine is restarted, the A/C compressor magnetic clutch turns on again.
• If the engine is stopped while the PTC heater is operating, the PTC heater turns off. When the engine is re-started, the PTC heater returns to normal control.
