Shift Conditions; Motor Controls; Synchronization; Compensation - SSANGYONG 2004 Rexton 2.7XDi Workshop Manual

Shift conditions

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 vehicle speed, "N" position in automatic transmission or clutch signal.
- Shift operation between 2H/4H and 4L is only available when the vehicle speed is below 46 km/h.
- No defective speed sensor

Motor controls

• The shift steps have the sequence of 2H → 4H → 4L and 4L → 4H → 2H. TCCU operates the shift motor until it reads
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 ignition power. If there are not operating signals from
position sensor, the shifting failure due to timeout occurs. This failure appears when the shifting time between 2H
and 4H and between 4H and 4L 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 recognize a fault before motor starts, it is considered as fault.
• Motor stops operation when it reaches at target range.

Synchronization

Synchronization occurs during shifting from 2WD (2H) to 4WD (4H or 4L). The synchronizer clutch and hub solenoid are
controlled during synchronization as follows:
- Clutch coil operates when the selector changes from 2H to 4H/4L.
- Shift motor moves in 4H mode.
- Hub solenoid starts its operation 4 seconds after shifted to 4H.
- Clutch coil stops its operation 5 seconds after the hub solenoid is activated.

Compensation

The motor stops when the encoder related troubles are detected during shift operation. It moves toward LOW-HIGH
direction for 5 seconds so that the motor is not left in unidentified position.
PART TIME
REXTON SM - 2004.4
3D-13
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN