0-27
CIRCUIT
ACTYON 2006.03
3410-01
POSITION ENCODER
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OPERATION
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TCCU initialization and operation▷
TCCU sends relevant data to meter cluster via CAN to diagnose and check the
indicators when the ignition switch is turned to ON. At this time, the 4WD indicators
(4WD LOW and 4WD HIGH) come on for 0.6 seconds.
TCCU starts diagnosis by operating clutch coil and hub solenoid for 1.5 seconds.
The shift operation is controlled to move only toward selector switch position if the
selector switch position is not met with shift motor position code when the ignition
switch is turned to ON.
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Drive Mode Change▷
The shift operation is only allowed when some conditions are satisfied.
These shift conditions should be satisfied for 2 seconds before starting motor.
The motor has three seconds of delay at its initial operation to do trouble diagnosis.
Once the motor starts, the shift conditions are no longer checked.
Shift conditions are as follows:▷
Normal battery voltage and shift motor for all gears
2H and 4H shifts has nothing to do with the vehicle speed, the “N” position in
the automatic transmission or the clutch signal.
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Motor Controls
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TCCU operates the shift motor until it reads the required position code.
If it detects the faulty code, the system is operated with the compensation mode.
Once the shift operation is started, it is completed regardless of the ignition power.
If there are not operating signals from the position sensor, the shifting failure occurs
due to timeout.
This failure appears when the shifting time between 2H and 4H is delayed over 5
seconds compared to normal shift.
Once the shifting time exceeds the specified time, TCCU cannot properly supply the
voltage to shift motor and is operated in compensation mode.
Even though the system recognizes a fault before motor starts, it is considered as a
fault.
Motor stops operation when it reaches target range.
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Synchronization▷
Synchronization occurs during shifting from 2WD (2H) to 4WD (4H).
The synchronizer clutch and the hub solenoid are controlled during the synchronization
as follows:
The clutch coil operates when the selector changes from 2H to 4H.
The shift motor moves in 4H mode.
The locking hub solenoid starts its operation 4 seconds after shifted to 4H.
The clutch coil stops its operation 5 seconds after the hub solenoid is activated.
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Compensation
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The motor stops when the encoder related to troubles are detected during shift
operation.
It moves toward LOWHIGH direction for 5 seconds so that the motor is not left in
unidentified position.
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