1998 SSANGYONG MUSSO ignition

5D1-8 TRANSFER CASE (PART TIME 4408)
SELF-DIAGNOSIS TEST
Test Procedure
1. Connect the scanner harness connector to the engine
compartment diagnosis socket.
2. Turn the ignition switch to "ON" position.
3. Select "Electronic control vehicle diagnosis" from the function
selection display and press "Enter".
4. Select "Musso" from vehicle model selection display and
press "Enter".
5. Select "TCCU" from control system selection display and
press "Enter".
6. Select "TCCU Part Time" from TCCU diagnosis selection
display.
Notice
Check sensor valve output display if necessary.
7 . Select "Self-diagnosis" from diagnosis items selection display.
8. Turn the ignition switch to "OFF" position and press
"ENTER". Turn the ignition swtich to "ON" position again
and press "ENTER".
9. Determine fault code and check the defective component.
Notice
Refer to self-diagnosis list.

TRANSFER CASE (PART TIME 4408) 5D1-37
Inspection and Repair
1. 4H and 4L indicator light inspection
lWhen turn the ignition switch to "ON" position, 4H and
4L indicator light will turn on for 0.6 second and will turn
off immediately.
Notice
If indicator light does not turn on, check bulb, wiring harness
and TCCU.
2. TCCU inspection
Pin No.
Operation Condition
4H or 4L
2H
4H indicator light ON
4H indicator light OFF
2H or 4H
4L
Clutch pedal applied
Clutch pedal released
4L indicator light ON
4L indicator light OFF
Motor OFF
Motor ON
Motor OFF
Motor ON
Auto locking hub ON
Auto locking hub OFFVoltage(V)
4.75 - 5.35
0 - 0.50
< 1.00
> 11.00
4.75 - 5.35
0 - 0.50
< 0.50
> 11.00
< 1.00
> 11.00
< 1.00
> 11.00
< 1.00
> 11.00
> 11.00
< 1.00 J1 - 7
J1 - 8
J1 - 13
J1 - 14
J1 - 15
J1 - 16
J1 - 17
J1 - 23
Notice
lDC 12V for the TCCU operation should be maintained.
lIn case of J1-8 and J1-15, indicator light will turn on for 0.6
second when turn the ignition switch ON.
lIf 4H and 4L indicator lights remain turned on when turn the
ignition switch on or during driving, perform the TCCU
diagnosis.

5D2-6 TRANSFER CASE (TOD)
Input/Output diagram
TOD control unit and main wiring harness is linked by 30 pin
connector. Each pin joins with switche and actuator whose
details refer to the below diagram.
Battery Power
Ignition ON/OFF
Position Encoder 1
Position Encoder 2
Position Encoder 3
Position Encoder 4
4H / 4L Switch Signal
A/T “N” Position Signal
Speed / TPS Supply
Front Speed Sensor Input
Rear Speed Sensor Input
ABS Operation Signal
Brake Switch Signal
4
5
27
10
28
30
9
24
16
11
29
25
26
19
CAN H
CAN L
Shift Motor output port
(LO-HI)
Shift Motor output port
(HI-LO)
EMC
'4L' Indicator
Position Return
'4WD CHECK' IND
TPS/speed Sensor Ground
(Speed / TPS Return)
2
1
3
21
6
7
13 15
14
K-Line20 22
23
17
18

TRANSFER CASE (TOD) 5D2-7
1. K-LINE : Communication line for coding and diagnosis with SCANNER.
Classification of Pin No.
ClassificationPin No. Pin NameDescription
Power Supply17,18Ground
TOD control unit ground
4,19Battery
TOD control unit battery supply : (Fuse No 13,20A)
5IgnitionIgnition ON / OFF
27Position 1
Position encoder 1 : check of shift motor position
10Position 2
Position encoder 2 : check of shift motor position
28Position 3
Position encoder 3 : check of shift motor position
30Position 4
Position encoder 4 : check of shift motor position
94H/4L SwitchTransfer case mode input
24Auto T/M Neutral
Check of neutral gear position in Auto T/M
16Speed5V supply (TPS / speed sensor)
11Front Speed
Front speed sensor signal input Signal Input
29Rear Speed
Rear speed sensor signal input
25ABS Operation
ABS ON / OFF
6Position Return
Position encoder ground
13Speed / TPS ReturnGround for speed sensor / TPS
22CAN-LCAN bus low line
23CAN-HCAN bus high line
2,15Motor LO-HIMotor output port
- LO to HI : join with battery
- HI to LO (or motor brake) : join with ground
1,14Motor HI-LO
Motor output port
- HI to LO : join with battery
- LO to HI (or motor brake) : join with ground
3EMCTOD output
Signal Output
214L IlluminationIlluminates “4L” indicator
7Diagnosis Display
4WD check lamp illuminator
- Upon defect ; Ground circuit
20K-LINE1)Diagnosis

5D2-8 TRANSFER CASE (TOD)
Position Code 1/2/3/4
111 0
1010
0010
0000
111 0
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 1Position Code 1/2/3/4
1001
0001
0101
0100Motor Position
Neutral
Zone 2
Low
Right Stop

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

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.
TODTM System Operation
The TODTM 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
8Function
Motor HI-LO
Motor LO-HI
EMC
Battery (+)
Ignition
Position Return
Diagnosis Display
-Pin
9
10
11
12
13
14
15
16Function
HI / LO Switch
Position 2
Front Speed
TPS Supply (Diesel)
Speed/TPS Return
Motor HI-LO
Motor LO-HI
Speed ReferencePin
17
18
19
20
21
22
23
24Function
Ground
Ground
Battery (+)
K-LINE
4L Illumination
CAN-H
CAN-L
Auto T/M, NeutralPin
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