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Control Item
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Contents
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Shift control
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• Detects engine load conditions and vehicle speed; shifts to optimum gear speed according to predetermined automatic shift diagram
• Switches automatically into dedicated slope mode according to road gradient
• Selects O/D off function according to operation of O/D OFF switch
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Line pressure control
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• Adjusts line pressure to match engine load and driving conditions using pressure control solenoid (duty cycle type)
• Automatically switches to optimal line pressure for each gear when shifting occurs
• Automatically switches to optimal line pressure when fluid temperature is low to speed up clutch and brake operation
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3-2 timing control
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• Temporarily switches 2-4 brake band engagement/release pressure and 3-4 clutch line pressure hydraulic circuits when shifting gears by on/off operation of 3-2 timing solenoid
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Shift solenoid on/off timing control
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• Switches 2-4 brake band engagement/release pressure, and 3-4 clutch and coasting clutch line pressure hydraulic circuits when shifting gears by on/off operation of shift solenoid A, B and C
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Torque reduction control
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• Temporarily reduces engine torque during gear shifting to improve shifting quality
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TCC control
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• Controls TCC according to predetermined TCC points
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Diagnostic system
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• Main components of ATX control system have self-diagnosis function; if malfunction occurs, O/D OFF indicator light flashes to warn driver and DTC is stored in PCM
• When malfunction is determined as result of on-board diagnostic, driveability is preserved as much as possible by fail-safe function
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