ACTIVE AIR SHUTTER CONTROL
id092300000200
Outline
• In the active air shutter control, the PCM controls the active air shutter actuator to open/close the shutter.
• The controlled functions are as follows:
Control Table
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Control
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Function
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Content
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Basic control
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1. Basic function
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• Opens/closes the shutter according to the vehicle speed, engine coolant temperature, or the load condition due to A/C operation.
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2. Shutter fully open/closed position learning function
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• Learns the shutter fully open/closed positions by opening/closing the shutter.
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Protection control
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1. Engine protection function
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• Opens the shutter to protect the engine if it is estimated that the engine coolant temperature is high or the engine oil temperature increases excessively.
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2. ATX protection function
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• Opens the shutter to protect the ATX if the ATF temperature is high.
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Fail-safe
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• Opens the shutter if the active air shutter control has a malfunction.
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Block Diagram
Operation
• The shutter is fully open when the ignition is switched off.
• The shutter is controlled in three positions; 0 °(fully closed), 78 ° (78 °open from fully closed position), and 90 ° (fully open).
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Note
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• With the shutter opened to the 78 ° position, more air flows to the radiator and condenser while driving than with the shutter fully open.
• The PCM opens/closes the active air shutter depending on the conditions after the shutter fully open/closed position learning is completed.
• The PCM opens/closes the shutter in the following control sections.
Basic Control
1. Basic function
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• The PCM fully closes the shutter when all the following conditions are met.
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― Vehicle speed: less than 140 km/h {87.0 mph}
― Engine coolant temperature: less than 100 °C {212 °F}
― Load condition due to A/C operation: vehicle speed and refrigerant pressure during A/C operation are the specified values or less
― Protection control is not operating
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• If any of the following conditions is met, the PCM opens the shutter to the 78 ° position.
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― Vehicle speed: 140 km/h {87.0 mph} or more
― Engine coolant temperature: 100 °C {212 °F} or more
― A/C operation is in the following range (to cool the condenser)
2. Shutter fully open/closed position learning function
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Note
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• After the main relay turns off (specified time has elapsed since ignition is switched off), the shutter fully open/closed positions recorded in the active air shutter actuator are cleared.
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Shutter fully open/closed position learning function flow
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1. After the ignition is switched ON, the PCM moves the shutter to the 90 ° (fully open) position when the vehicle speed is 10 km/h {6.2 mph} or more.
2. After the shutter reaches the 90 ° (fully open) position, the PCM moves the shutter to the 0 ° (fully closed) position.
3. When the shutter reaches the 0 ° (fully closed) position, the shutter fully open/closed position learning function is completed.
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• If an error occurs during the shutter fully open/closed position learning and the learning is not completed, the PCM performs the learning again (to maximum 3 times).
Protection Control
1. Engine protection function
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• If the following condition is met, the PCM opens the shutter to the 78 ° position to protect the engine until the ignition is switched off.
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― Engine coolant temperature: 116 °C {241 °F} or more
2. ATX protection function
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• For ATX protection, when the PCM receives a cooling fan operation request signal from the TCM, the PCM opens the shutter to the 78 ° position until the ignition is switched off to prevent the ATF temperature from being excessively high, and also to lower the frequency of fail-safe operations which operate when the ATF temperature is high.
Fail-safe
• If any of the following DTCs is stored, the PCM opens the shutter to the 78 ° position.
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― Intake air temperature sensor No.1 malfunction (P0112:00, P0113:00)
― Engine coolant temperature sensor malfunction (P0117:00, P0118:00)
― Vehicle speed signal error (P0500:00)
― Active air shutter malfunction (P059F:00, P05A0:00)
