SsangYong Musso. Manual — part 515
TRANSFER CASE (TOD) 5D2-7
1. K-LINE : Communication line for coding and diagnosis with SCANNER.
Classification of Pin No.
Classification
Pin No.
Pin Name
Description
Power Supply
17,18
Ground
TOD control unit ground
4,19
Battery
TOD control unit battery supply : (Fuse No 13,20A)
5
Ignition
Ignition ON / OFF
27
Position 1
Position encoder 1 : check of shift motor position
10
Position 2
Position encoder 2 : check of shift motor position
28
Position 3
Position encoder 3 : check of shift motor position
30
Position 4
Position encoder 4 : check of shift motor position
9
4H/4L Switch
Transfer case mode input
24
Auto T/M Neutral
Check of neutral gear position in Auto T/M
16
Speed
5V supply (TPS / speed sensor)
11
Front Speed
Front speed sensor signal input
Signal Input
29
Rear Speed
Rear speed sensor signal input
25
ABS Operation
ABS ON / OFF
6
Position Return
Position encoder ground
13
Speed / TPS Return
Ground for speed sensor / TPS
22
CAN-L
CAN bus low line
23
CAN-H
CAN bus high line
2,15
Motor LO-HI
Motor output port
-
LO to HI : join with battery
-
HI to LO (or motor brake) : join with ground
1,14
Motor HI-LO
Motor output port
-
HI to LO : join with battery
-
LO to HI (or motor brake) : join with ground
3
EMC
TOD output
Signal Output
21
4L Illumination
Illuminates “4L” indicator
7
Diagnosis Display
4WD check lamp illuminator
-
Upon defect ; Ground circuit
20
K-LINE
1)
Diagnosis
5D2-8 TRANSFER CASE (TOD)
Position Code 1/2/3/4
1110
1010
0010
0000
1110
Initial Operation of TOD Control Unit
When ignition “ON”, “4L” and "4WD check" lamps illuminates
for 0.6second to check bulb in instrument panel, then perform
diagnosis of system.
Position Encoder
The Position Encoder is used by the TCCU to determine the
position of the Shift Motor. Each motor position is identified by
a position code as shown.
Notice
1. All other position codes are invalid
2. Position Input Open Circuit (> 4.5V) = 1
3. Position Input shorted to Speed/Position Return (< 0.5V) = 0
Motor Position
Left Stop
Left of High
High
Right of High
Zone 1
Position Code 1/2/3/4
1001
0001
0101
0100
Motor Position
Neutral
Zone 2
Low
Right Stop
TRANSFER CASE (TOD) 5D2-9
4H/4L Switch Input
4H
4H
4H
4H
4H
4H
4H
4H
4H
4L
4L
4L
4L
4L
4L
4L
4L
4L
Position Sensor Interpretation
1. When the module powers up, it will read the position sensor
and the 4H/4L switch input and respond to the possible
codes as follows
2. A command to shift will only be acted upon if the TCCU is
reading a valid code at the time the command to shift is
made.
3. After a shift has started, the TCCU will power the shift motor
until the code for the requested position is read. If an invalid
code is read, the TCCU will go into a default mode.
4. During a shift attempt, the shift motor will be energized for a
maximum of 5 seconds.
Motor Position
Left Stop
Left of High
High
Right of High
Zone 1
Neutral
Zone 2
Low
Right Stop
Left Stop
Left of High
High
Right of High
Zone 1
Neutral
Zone 2
Low
Right Stop
Action
No action required. 4L bulb off.
No action required. 4L bulb off.
No action required. 4L bulb off.
Blink 4L bulb. After the shift conditions are met, attempt a shift
to 4H under conditions of below 87 rpm in front and rear
propshaft and “Neutral” position. After succesfully shifting into
4H, stop blinking 4L bulb.
Same as above
Same as above
Same as above
Same as above
Same as above
Blink 4L bulb. After the shift conditions are met, attempt a shift
to 4L. After succesfully shifting into 4L, stop blinking 4L bulb.
Same as above
Same as above
Same as above
Same as above
Same as above
Same as above
No action required. 4L bulb on.
No action required. 4L bulb on.
5D2-10 TRANSFER CASE (TOD)
Electric Shift System Operation
The Electric Shift System is responsible for changing the Transfer Case gear ratio by controlling the electric shift
motor. The TCCU 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.
1. Shift Criteria
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
TCCU will attempt a range change after the following shift criteria are met:
a. The transmission is in neutral for 2 seconds after the shift is requested.
b. Both propshaft speeds are below 87 rpm (2580 pulses/minute).
If the transmission is taken out of neutral before 2 seconds has elapsed, or either propshaft speed increases
above the limit, the shift will be suspended and the 4L Indicator will continue to blink until the criteria are met again
or the 4H/4L Switch is returned to the original position.
2. Range Change
When the shift criteria are met, the motor is rotated in the appropriate direction (as determined by the selector
switch) until one of the following occurs:
a. The motor reaches its destination.
b. The motor is on for 5 seconds without reaching its destination. The shift has failed and the TCCU will respond
as default mode.
c. 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, propshaft speeds, and transmission neutral inputs are
ignored.
3. Indicator Function
Once a range change has been initiated the 4L Indicator will begin to blink at a rate of 0.3 seconds on, 0.3
seconds off until the shift is completed or canceled.
If a successful shift has been completed, the 4L Indicator will be illuminated if the motor is in Low and it will be
turned off if the motor is in High.
4L Indicator illuminates as below figure.
•
4H
→
4L
@ : shift is completed
•
4L
→
4H
@ : shift is completed
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