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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)

Ignition

Ignition ON / OFF

Position 1

Position encoder 1 : check of shift motor position

Position 2

Position encoder 2 : check of shift motor position

Position 3

Position encoder 3 : check of shift motor position

Position 4

Position encoder 4 : check of shift motor position

4H/4L Switch

Transfer case mode input

Auto T/M Neutral

Check of neutral gear position in Auto T/M

Speed

5V supply (TPS / speed sensor)

Front Speed

Front speed sensor signal input

Signal Input

Rear Speed

Rear speed sensor signal input

ABS Operation

ABS ON / OFF

Position Return

Position encoder ground

Speed / TPS Return

Ground for speed sensor / TPS

CAN-L

CAN bus low line

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

EMC

TOD output

Signal Output

4L Illumination

Illuminates “4L” indicator

Diagnosis Display

4WD check lamp illuminator
-

Upon defect ; Ground circuit

K-LINE

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

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.

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

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

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.

•

→

@ : shift is completed

•

→

@ : shift is completed

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