AUTOMATIC TRANSMISSION
05–13–44
TORQUE CONVERTER CLUTCH (TCC) OPERATION
CHU051301030S17
TCC release
• The TCM stops driving the TCC solenoid (OFF) when TCC release is determined.
TCC engagement
• When the TCM determines TCC engagement, the TCM gradually increases the duty ratio energizing the TCC
solenoid, and gradually drains the oil pressure in the torque converter F chamber.
• The TCC piston slowly presses against the converter cover, and the TCC engages smoothly.
Determination of TCC inhibition
• The TCC is inhibited when any of the following conditions are met.
— ATF temperature is low.
— Throttle valve is closed.
— Failure is detected by diagnosis function.
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SLOPE MODE CONTROL OUTLINE
CHU051301030S18
• Climbing or descending is determined based on the engine output torque and the vehicle acceleration, and the
shift gear is controlled to realize smooth vehicle driving.
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SLOPE MODE CONTROL OPERATION
CHU051301030S19
When climbing hill
• When the hill is steeper than a certain grade, unnecessary shift up is prevented by holding an appropriate shift
gear.
Descending hill
• When the descent is steeper than a certain grade and the brake switch is depressed, use of the brake pedal is
reduced by shifting from 4GR to 3GR, or 3GR to 2GR and applying engine braking.
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TORQUE CONVERTER
F CHAMBER
TORQUE CONVERTER
PRESSURE (DRAIN)
TORQUE CONVERTER PRESSURE
OIL COOLER
TCC SOLENOID
PILOT PRESSURE
TCC CONTROL VALVE
CHU0513S061
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