SsangYong Musso. Service manual — part 516
TRANSFER CASE (TOD) 5D2-11
4. Electric Shift Default Mode
If the motor fails to reach its destination, the TCCU will attempt the following (in order):
a. The TCCU will wait 3 seconds then attempt the shift again.
b. If the second attempt to reach the destination fails the TCCU will wait 3 seconds then attempt to rotate the
motor back to the original position. If successful, all future shifts will be inhibited until the Ignition is cycled.
c. If the attempt to return to the original position fails, the TCCU will wait 3 seconds then attempt to rotate the
motor to the original position again. If the second attempt to return to the original position is successful, the
“4WD CHECK” lamp will be illuminated, and all future shifts will be inhibited until the Ignition is cycled.
d. If the second attempt to return to the original position fails the motor will be turned off, the “4WD CHECK” lamp
will be illuminated, and all future shifts will be inhibited until the Ignition is cycled.
TOD
TM
System Operation
The TOD
TM
System is responsible for distributing torque between the front and rear axles. The TCCU monitors the
propshaft 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.
1. Touch-off Torque
The minimum EMC Duty Cycle is based on the vehicle speed and throttle position
The TCCU receives the TPS signal from the following sources:
On vehicles equipped with CAN, the TCCU receives the TPS signal from the CAN bus.
2. When Slip Detection
The TCCU continuously monitors the front and rear propshaft speeds to detect wheel slip.
3. Wheel Slip Control
When wheel slip is detected the TCCU 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.
4. 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.
5. 4L Strategy
When the system is operating in 4L, the TCCU continues TOD
TM
(operation provided that the propshaft speed is
below 175 rpm (5220 pulses/minute)). When the speed increases above 175 rpm, the EMC Duty Cycle is set to
the maximum value (88%) which applies the maximum available torque to the front axle.
5D2-12 TRANSFER CASE (TOD)
Pin
1
2
3
4
5
6
7
8
Function
Motor HI-LO
Motor LO-HI
EMC
Battery (+)
Ignition
Position Return
Diagnosis Display
-
Pin
9
10
11
12
13
14
15
16
Function
HI / LO Switch
Position 2
Front Speed
TPS Supply (Diesel)
Speed/TPS Return
Motor HI-LO
Motor LO-HI
Speed Reference
Pin
17
18
19
20
21
22
23
24
Function
Ground
Ground
Battery (+)
K-LINE
4L Illumination
CAN-H
CAN-L
Auto T/M, Neutral
Pin
25
26
27
28
29
30
-
-
Function
ABS Input
Brake Switch
Position 1
Position 3
Rear Speed
Position 4
-
-
TOD CONTROL UNIT
Shape and function of TOD Control Unit
TRANSFER CASE (TOD) 5D2-13
Speed Sensor/Clutch Coil and Motor Connector
Speed senso /clutch coil and shift motor connector locate upper
backside transfer case (upper part of shift motor).
-
Shift motor connector : Black
-
Speed sensor and clutch coil connector : White
Shift Mtor Connector
Speed Sensor/Clutch Coil Connector
Rear View for Connector
Pin
A
B
C
D
E
F
G
Function
Position 4
Motor (Counter-Clockwise)
Position 3
Position 2
Position 1
Position Retum
Motor (Clockwise)
Pin
H
I
J
K
L
M
N
Function
Clutch Coil (EMC)
Front Speed Return
Front Speed
Front Speed Sensor Supply
Rear Speed Sensor Supply
Rear Speed
Rear Speed Return
Rear View for Connector
5D2-14 TRANSFER CASE (TOD)
Motor HI-LO(clockwise)
Motor LO-HI(counterclockwise)
PIN 13
CONTROL UNIT DIAGRAM
TOD CONTROL UNIT
14
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