AIR CONDITIONER i-stop CONTROL OPERATION [FULL-AUTO AIR CONDITIONER]

id0740a1107400


i-stop Request Control (i-stop Permit/Inhibit)

•  The climate control unit sends i-stop permit or inhibit request signals to the PCM according to the operation condition of the air conditioner system.

i-stop inhibit request

•  The climate control unit sends an i-stop inhibit request signal to the PCM when it detects any of the following conditions:

i-stop inhibit conditions

No.

Item

Vehicle condition
1
Climate control unit malfunction determined
A DTC is detected in relation to the following parts:
•  Solar radiation sensor
•  Ambient temperature sensor
•  Cabin temperature sensor
•  Evaporator temperature sensor
•  Heater core temperature sensor
•  Engine coolant temperature sensor
•  Airflow mode actuator
•  Air mix actuator
2
CAN line error determined
Signal reception error occurs on climate control unit side in relation to the following signals:
•  Ambient temperature signal
•  Engine coolant temperature signal
•  Engine operation status signal (i-stop status signal)
3
Ambient temperature
Ambient temperature is -10 °C {14 °F} or below, or 50 °C {122 °F} or more
4
Heated windshield operation status
Heated windshield is operating
5
Rear window defroster operation status
Rear window defroster is operating
6
Airflow mode control status
During manual defroster control
7
Set temperature, compressor control mode
MAX HOT or MAX COLD (A/C or ECO mode)
8
Auto air conditioner target temperature attainment status
If any of the following signals do not meet the i-stop permit conditions (Comfortable cabin temperature control not performed):
•  Cabin temperature (cabin target temperature and cabin temperature relation)
•  Evaporator temperature
•  Air mix actuator opening angle


i-stop permit request

•  The climate control unit sends an i-stop permit request signal to the PCM when it detects any of the following conditions:

i-stop permit conditions

No.

Vehicle condition
1
•  Blower motor is off with i-stop inhibit conditions No.1 to 4 not met
2
•  The following conditions are met with i-stop inhibit conditions No.1 to 5 not met
―  Blower motor: On
―  Set temperature: Except MAX HOT
―  Compressor control: Off (A/C off)
3
•  The following conditions are met with i-stop inhibit conditions No.1 to 7 not met
―  Blower motor: On
―  Compressor control: On (A/C on)
―  The relation between the cabin target temperature and cabin temperature meets the i-stop permit conditions
(comfortable cabin temperature control is performed)


A/C Control Start During i-stop (Engine-stop Control)

•  When the A/C operation is stopped by the i-stop control, and while i-stop permit condition No. 3 is met, the climate control unit starts A/C control corresponding to the engine-stop condition if it detects an engine-stop condition based on the i-stop condition signal sent from the PCM.
•  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.

Recovery to Normal A/C Control

•  When recovery condition a or b is met while the engine is stopped by the i-stop control, the climate control unit sends an engine restart request signal to the PCM.
•  It returns to the normal A/C control when the engine is restarted.

Recovery condition a: i-stop cancel determination condition is met

i-stop cancel determination conditions

Compressor control mode

Airflow mode

VENT

BI-LEVEL

HEAT, DEF/HEAT,DEFROSTER
A/C, ECO, OFF
If any one of the following conditions are met:
•  Evaporator temperature is at i-stop control specification or more
•  Air mix actuator opening angle is in position other than i-stop control specification.
If any one of the following conditions are met:
•  Evaporator temperature is at i-stop control specification or more
•  Heater core temperature is at i-stop control specification or less
•  Air mix actuator opening angle is in position other than i-stop control specification
If any one of the following conditions is met:
•  Heater core temperature is at i-stop control specification or less
•  Air mix actuator opening angle is in position other than i-stop control specification


Recovery condition b: Any one of the following i-stop inhibit conditions is met:

•  No.1 climate control unit malfunction determination
•  No.2 CAN transmission error determination
•  No.4 heated windshield operation status
―  During normal control (except i-stop), operation of the heated windshield switch (on) is not accepted during engine-stop.
―  If A/C control occurs during i-stop, operation of the heated windshield switch (on) is accepted, the engine is restarted, and the heated windshield function is operated.
•  No.5 rear window defroster operation status
―  If the rear window defroster switch is operated (on) from auto control status while the engine is stopped (i-stop), the engine is restarted, and the rear window defroster is operated.
•  No. 6 mode control status
•  No.7 set temperature, compressor control mode


Maximum i-stop (Engine-stop Control) Operation Time Restriction Switching

•  The maximum i-stop (engine-stop control) operation time can be shortened by operating the climate control unit. As a result, sudden window fogging is prevented.
•  Restriction of the maximum i-stop (engine-stop control) operation time can be switched at two levels (normal time period/minimum time period).
•  For details on the switching operation, refer to the Workshop Manual.