Nissan Titan. Manual - part 121

DLN-56

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: TX15B]

TRANSFER CONTROL UNIT

ECU DIAGNOSIS INFORMATION

TRANSFER CONTROL UNIT

Reference Value

INFOID:0000000009886006

VALUE ON THE DIAGNOSIS TOOL

CONSULT data monitor item

Monitored item [Unit]

Content

Condition

Display value

VHCL/S SEN·FR [km/h] 
or [mph]

Wheel speed (Front wheel)

Vehicle stopped

0 km/h (0 mph)

Vehicle running

CAUTION:

Check air pressure of tire under standard condi-
tion.

Approximately 
equal to the indica-
tion on speedome-
ter (Inside of 

±10%)

VHCL/S SEN·RR [km/h] 
or [mph]

Wheel speed (Rear wheel)

Vehicle stopped

0 km/h (0 mph)

Vehicle running

CAUTION:

Check air pressure of tire under standard condi-
tion.

Approximately 
equal to the indica-
tion on speedome-
ter (Inside of 

±10%)

ENGINE SPEED [rpm]

Engine speed

Engine stopped
(Engine speed: Less than 400 rpm)

0 rpm

Engine running
(Engine speed: 400 rpm or more)

Approximately 
equal to the indica-
tion on tachometer

BATTERY VOLT [V]

Power supply voltage for 
transfer control unit

Ignition switch: ON

Battery voltage

2WD SWITCH [On/Off]

Input condition from 4WD 
shift switch

4WD shift switch: 2WD

On

4WD shift switch: 4H and 4LO

Off

4H SWITCH [On/Off]

Input condition from 4WD 
shift switch

4WD shift switch: 4H

On

4WD shift switch: 2WD and 4LO

Off

4L SWITCH [On/Off]

Input condition from 4WD 
shift switch

4WD shift switch: 4LO

On

4WD shift switch: 2WD and 4H

Off

4L POSI SW [On/Off]

Condition of 4LO switch

• Vehicle stopped
• Engine running
• A/T selector lever N po-

sition

• Brake pedal depressed

4WD shift switch: 4LO

On

Except the above

Off

ATP SWITCH [On/Off]

Condition of ATP switch

• Vehicle stopped
• Engine running
• A/T selector lever N po-

sition

• Brake pedal depressed

4WD shift switch
: 4H to 4LO or 4LO to 4H
(While actuator motor is 
operating.)

 On

Except the above

Off

WAIT DETCT SW [On/
Off]

Condition of wait detection 
switch

• Vehicle stopped
• Engine running
• A/T selector lever N po-

sition

• Brake pedal depressed

4WD shift switch
: 4H and 4LO

On

4WD shift switch: 2WD

Off

4WD MODE [2H/4H/4L]

Control status of 4WD
(Output condition of 4WD 
shift indicator lamp and 
4LO indicator lamp)

4WD shift switch
(Engine running)

2WD

2H

4H

4H

4LO

4L

TRANSFER CONTROL UNIT

DLN-57

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: TX15B]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

PHYSICAL VALUES

VHCL/S COMP [km/h] or 
[mph]

Vehicle speed

Vehicle stopped

0 km/h (0 mph)

Vehicle running

CAUTION:

Check air pressure of tire under standard condi-
tion.

Approximately 
equal to the indica-
tion on speedome-
ter (Inside of 

±10%)

SHIFT ACT 1 [On/Off]

Output condition to actua-
tor motor (clockwise)

• Vehicle stopped
• Engine running
• A/T selector lever N po-

sition

• Brake pedal depressed

4WD shift switch
: 2WD to 4H or 4H to 4LO 
or 2WD to 4LO

On

Except the above

Off

SHIFT AC MON1 [On/
Off]

Check signal for transfer 
control unit signal output

• Vehicle stopped
• Engine running
• A/T selector lever N po-

sition

• Brake pedal depressed

4WD shift switch
: 2WD to 4H or 4H to 4LO 
or 2WD to 4LO

On

Except the above

Off

SHIFT ACT 2 [On/Off]

Output condition to actua-
tor motor (counterclock-
wise)

• Vehicle stopped
• Engine running
• A/T selector lever N po-

sition

• Brake pedal depressed

4WD shift switch
: 4LO to 4H or 4H to 2WD 
or 4LO to 2WD

On

Except the above

Off

SHIFT AC MON2 [On/
Off]

Check signal for transfer 
control unit signal output

• Vehicle stopped
• Engine running
• A/T selector lever N po-

sition

• Brake pedal depressed

4WD shift switch
: 4LO to 4H or 4H to 2WD 
or 4LO to 2WD

On

Except the above

Off

SHIFT ACT/R MON [On/
Off]

Operating condition of ac-
tuator motor relay (integrat-
ed in transfer control unit)

• Vehicle stopped
• Engine running
• A/T selector lever N po-

sition

• Brake pedal depressed

When 4WD shift switch is 
operated

On

When 4WD shift switch is 
not operated

Off

SHIFT POS SW1 [On/
Off]

Condition of actuator posi-
tion switch 1

• Vehicle stopped
• Engine running
• A/T selector lever N po-

sition

• Brake pedal depressed

4WD shift switch: 2WD 
and 4LO

On

4WD shift switch: 4H

Off

SHIFT POS SW2 [On/
Off]

Condition of actuator posi-
tion switch 2

4WD shift switch: 4LO

On

4WD shift switch: 2WD 
and 4H

Off

SHIFT POS SW3 [On/
Off]

Condition of actuator posi-
tion switch 3

4WD shift switch: 2WD 
and 4H

On

4WD shift switch: 4LO

Off

SHIFT POS SW4 [On/
Off]

Condition of actuator posi-
tion switch 4

4WD shift switch: 4H and 
4LO

On

4WD shift switch: 2WD

Off

4WD FAIL LAMP [On/
Off]

4WD warning lamp condi-
tion

4WD warning lamp: ON

On

4WD warning lamp: OFF

Off

2WD IND [On/Off]

Rear indicator of 4WD shift 
indicator lamp condition

Rear indicator of 4WD shift indicator lamp: ON

On

Rear indicator of 4WD shift indicator lamp: OFF

Off

4H IND [On/Off]

Front and center indicator 
of 4WD shift indicator lamp 
condition

Front and center indicator of 4WD shift indicator lamp
: ON

On

Front and center indicator of 4WD shift indicator lamp
: OFF

Off

4L IND [On/Off]

4LO indicator lamp condi-
tion

4LO indicator lamp: ON

On

4LO indicator lamp: OFF

Off

Monitored item [Unit]

Content

Condition

Display value

DLN-58

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: TX15B]

TRANSFER CONTROL UNIT

Terminal Layout

WDIA0140E

Terminal

Wire 

color

Item

Condition

Data (Approx.)

1

L

CAN-H

–

–

2

P

CAN-L

–

–

3

L

K-LINE (CONSULT signal)

–

–

6

B

Ground

Always

0V

10

LG/B

Actuator position switch 1

• Vehicle stopped
• Engine running
• A/T selector le-

ver N position

• Brake pedal de-

pressed

4WD shift switch: 2WD and 4LO

0V

4WD shift switch: 4H

Battery voltage

11

W/L

Actuator position switch 2

4WD shift switch: 4LO

0V

4WD shift switch: 2WD and 4H

Battery voltage

12

BR

Actuator position switch 3

4WD shift switch: 2WD and 4H

0V

4WD shift switch: 4LO

Battery voltage

13

BR/W Actuator position switch 4

4WD shift switch: 4H and 4LO

0V

4WD shift switch: 2WD

Battery voltage

14

G/W

4WD shift switch (2WD)

Ignition switch: ON

4WD shift switch: 2WD

Battery voltage

4WD shift switch: 4H and 4LO

0V

15

O

4WD shift switch (4H)

4WD shift switch: 4H

Battery voltage

4WD shift switch: 2WD and 4LO

0V

16

R

4WD shift switch (4LO)

4WD shift switch: 4LO

Battery voltage

4WD shift switch: 2WD and 4H

0V

17

G/Y

Wait detection switch

• Vehicle stopped
• Engine running
• A/T selector le-

ver N position

• Brake pedal de-

pressed

4WD shift switch: 4H and 4LO

0V

4WD shift switch: 2WD

Battery voltage

18

B

Ground

Always

0V

19

W

Power supply
(Memory back-up)

Ignition switch: ON

Battery voltage

Ignition switch: OFF

Battery voltage

23

R/B

ATP switch

• Vehicle stopped
• Engine running
• A/T selector le-

ver N

• Brake pedal de-

pressed

4WD shift switch
: 4H to 4LO or 4LO to 4H
(While actuator motor is operating.)

0V

Except the above

Battery voltage

24

V

4LO switch

• Vehicle stopped
• Engine running
• A/T selector le-

ver N position

• Brake pedal de-

pressed

4WD shift switch: 4LO

0V

Except the above

Battery voltage

TRANSFER CONTROL UNIT

DLN-59

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: TX15B]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

CAUTION:

When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals.

NOTE:

Data are reference value and are measured between each terminal and ground.

DTC Index

INFOID:0000000009886007

DTC CHART

25

L/W

Ignition switch monitor

Ignition switch: ON

Battery voltage

Ignition switch: OFF

0V

27

Y/R

Actuator motor power supply

Ignition switch: ON

Battery voltage

Ignition switch: OFF
(5 seconds after ignition switch is turned OFF)

0V

28

Y/W

Actuator motor (+)

• Vehicle stopped
• Engine running
• A/T selector le-

ver N position

• Brake pedal de-

pressed

When 4WD shift switch is operated (while 
actuator motor is operating)

Battery voltage 
→ 0V

When 4WD shift switch is not operated

0V

31

G/R

Actuator motor (-)

Always

0V

32

B

Ground

Always

0V

40

Y

Transfer shut off relay

Ignition switch: ON

0V

Ignition switch: OFF
(5 seconds after ignition switch is turned OFF)

Battery voltage

42

BR

Transfer shift high relay

• Vehicle stopped
• Engine running
• A/T selector le-

ver N position

• Brake pedal de-

pressed

4WD shift switch: 2WD to 4H or 4H to 4LO 
or 2WD to 4LO

0V

Except the above

Battery voltage

44

Y/R

Power supply

Ignition switch: ON

Battery voltage

Ignition switch: OFF
(5 seconds after ignition switch is turned OFF)

0V

45

Y/R

Power supply

Ignition switch: ON

Battery voltage

Ignition switch: OFF
(5 seconds after ignition switch is turned OFF)

0V

47

Y/L

Transfer shift high relay moni-
tor

• Vehicle stopped
• Engine running
• A/T selector le-

ver N position

• Brake pedal de-

pressed

4WD shift switch: 2WD to 4H or 4H to 4LO 
or 2WD to 4LO (while actuator motor is op-
erating)

Battery voltage 
→ 0V

Except the above

0V

48

G/B

Transfer shift low relay moni-
tor

4WD shift switch: 4LO to 4H or 4H to 2WD 
or 4LO to 2WD (while actuator motor is op-
erating)

Battery voltage 
→ 0V

Except the above

0V

50

R

Transfer shift low relay

4WD shift switch: 4LO to 4H or 4H to 2WD 
or 4LO to 2WD

0V

Except the above

Battery voltage

Terminal

Wire 

color

Item

Condition

Data (Approx.)

DTC

CONSULT

Diagnostic item is detected when...

Reference

[P1801]

*INITIAL START*

Due to removal of battery which cuts off power supply to transfer control unit, 
self-diagnosis memory function is suspended.

DLN-20