Electric Shift System Operation; Shift Requirements; Range Change - SSANGYONG 2004 Rexton 2.7XDi Workshop Manual

ELECTRIC SHIFT SYSTEM OPERATION

The electric shift system is responsible for changing the transfer case gear ratio by controlling the electric shift motor.
The TOD monitors the 4H/4L switch, neutral switch, speed sensors, position encoder, and ignition switch.
A range change is initiated when:
1. The 4H/4L switch is changed from 4H to 4L or from 4L to 4H.
2. The motor position (as indicated by the position encoder) does not match the 4H/4L switch immediately after the
ignition is turned on.

Shift Requirements

When a range change is initiated a diagnostic test will be completed on the motor, speed sensors, and position
encoder. If the diagnostic test fails, the shift will not be attempted. If all components are operating properly, the TOD will
attempt a range change after the following shift requirements are met:
1. The transmission is in neutral for 2 seconds after the shift is requested.
In case of manual transmission, the clutch pedal should be depressed.
2. Both propeller shaft speeds are below 43 Hz.
If the transmission is taken out of neutral before 2 seconds has elapsed, or either propeller shaft speed increases above
the limit, the shift will be suspended and the 4L indicator will continue to flicker until the requirements are met again or
the 4H/4L switch is returned to the original position. However, if the initial switch position is "4L", "4L" indicator remains
on. If the shift requirements are met, the shift motor attempt to shift again.

Range Change

When the shift requirements are met, the motor rotates to the appropriate direction (as determined by the selector
switch) until one of the following occurs:
1. The motor reaches its destination.
2. The motor is on for 5 seconds without reaching its destination. The shift has failed and the TOD will respond as
default mode.
3. A fault occurs with either the motor or position encoder. Refer to the diagnosis requirement.
When the motor is energized, the Ignition, 4H/4L switch, propeller shaft speeds, and transmission neutral inputs are
ignored.
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
- Shift operation between 2H/4H and 4L is only available when the vehicle speed is below 43 Hz.
- No defective speed sensor
- The selector lever should be in "N" position (in case of manual transmission, the clutch pedal should be depressed).
TOD
REXTON SM - 2004.4
3E-15
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN