SsangYong Stavic / SsangYong Rodius (2005 year). Service manual — part 354
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TOD
STAVIC - 2004.09
4D
Etc
The TOD system is responsible for distributing torque between the front and rear axles. The TOD monitors the propeller
shaft speeds, operating range (High/Low), and ABS activity and then applies a calculated amount of torque to the front
axle by Pulse Width Modulating the current applied to the EMC.
Touch-off torque
The minimum EMC Duty Cycle is based on the vehicle speed and throttle position.
The TOD receives the TPS signal from the following sources:
On vehicles equipped with CAN, the TOD receives the TPS signal from the CAN bus.
When slip detection
The TOD continuously monitors the front and rear propeller shaft speeds to detect wheel slip.
Wheel slip control
When wheel slip is detected the TOD controls the EMC duty cycle as necessary until the wheel slip is reduced below
the allowable limit. The EMC Duty Cycle will then be reduced to the Touch-Off value.
Brake/ABS strategy
When the ABS System is active, the EMC Duty Cycle is set to a fixed duty cycle (30 %) to aid in braking without
counteracting the ABS System.
4L strategy
When the system is operating in 4L, the TOD continues TOD (operation provided that the propeller shaft speed is below
87 Hz). When the speed increases above 10 Hz, the EMC Duty Cycle is set to the maximum value (88 %) which applies
the maximum available torque to the front axle.
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Shifting Sequence
Flow chart
Yes
Yes
Is the position
code valid and
sequential?
Does the motor
operate for
maximum limit?
Shift
requirements
Check shift
conditions
Satisfied shift
conditions for 2
seconds
Analyzing position
encoder
Is the position
code valid?
Move further to
requested direction
Reached at
target location?
Shift motor OFF
Completed
Canceling general encoder
DTC Shift is not available
during ignition cycle
Motor stops Shift
time out DTC
Moto stops
General
encoder DTC
Motor ON to L-H
during maximum limit
Shift is not available
during ignition cycle
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Start
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TOD
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Shift Requirements
• If 4H/4L switch position is not matched with shift motor position code with the ignition switch “ON”, the shift requirements
operate to the direction of 4H/4L conversion switch.
• The next shift requirements are identified only when those are different from current operation.
Shift Conditions
Shift is allowed only when certain conditions for the vehicle are satisfied. This means that the shift conditions must
satisfy the operating conditions for 2 seconds before motor starts and 2 seconds of delay at initial stage is to diagnose
the system.
The shift requirements are as follows:
- There should be no fault with battery voltage and shift motor for all shifts.
- Shift between 4H and 4L is operated only under the vehicle speed of below 43 Hz.
- There should be no fault with speed sensors.
- Transmission must be in neutral position (In case of manual transmission, the clutch pedal should be depressed).
Reading position encoder
The position encoder is the code that TCCU can determine the shift motor position.
1
1
1
0
0
1
1
0
0
0
1
3
1
1
1
0
0
0
0
0
0
1
Left Stop
Left top
Top
Right top
Zone 1
Neutral
Zone 2
Bottom
Right stop
Off State
Input voltage
1 : above 4.5V (HIGH)
0 : below 0.5V (LOW)
2
1
0
0
0
0
0
0
1
1
1
4
0
0
0
0
0
1
1
1
0
1
Motor Position
Remark
Position
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TOD
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4D
3. SPEED SENSOR AND CLUTCH COIL
The front and rear speed sensor utilizes the hall effect. These sensors generate 0V and 5V of square type digital
wave according to the rotation of the wheel with teeth of transfer case front and rear output shaft. The speed
signal from front and rear propeller shaft is entered into TOD control unit.
Pin
4
6, 7
1, 2, 5
3
Function
Clutch coil
Sensor power supply (5V)
Sensor signal
Sensor ground
2(G)
5(Sb)
7(Gr/R)
1(G)
3(B)
6(Gr/R)
4(Br)
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