Nissan Frontier. Instruction — part 289

DLN-58

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: TX15B]

TRANSFER CONTROL UNIT

Terminal Layout

WDIA0260E

Terminal

Wire

color

Item

Condition

Data (Approx.)

1

L

CAN-H

–

–

2

P

CAN-L

–

–

3

SB

K-LINE (CONSULT signal)

–

–

6

B

Ground (M/T models)

Always

0V

10

LG

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

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

L

Actuator position switch 4

4WD shift switch: 4H and 4LO

0V

4WD shift switch: 2WD

Battery voltage

14

G

4WD shift switch (2WD)

Ignition switch: ON

4WD shift switch: 2WD

Battery voltage

4WD shift switch: 4H and 4LO

0V

15

BG

4WD shift switch (4H)

4WD shift switch: 4H

Battery voltage

4WD shift switch: 2WD and 4LO

0V

16

W

4WD shift switch (4LO)

4WD shift switch: 4LO

Battery voltage

4WD shift switch: 2WD and 4H

0V

17

BG

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

R

Power supply
(Memory back-up)

Ignition switch: ON

Battery voltage

Ignition switch: OFF

Battery voltage

23

R

ATP switch (A/T models)

• 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

Y

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:0000000009479686

DTC CHART

25

W/G

Ignition switch monitor

Ignition switch: ON

Battery voltage

Ignition switch: OFF

0V

27

L

Actuator motor power supply

Ignition switch: ON

Battery voltage

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

0V

28

SB

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

Actuator motor (-)

Always

0V

32

B

Ground

Always

0V

33

P

Park/Neutral position switch
(M/T models)

Ignition switch: ON

M/T shift lever neutral position

0V

Except the above

Battery voltage

40

V

Transfer shut off relay

Ignition switch: ON

0V

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

Battery voltage

42

LG

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

Power supply

Ignition switch: ON

Battery voltage

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

0V

45

GR

Power supply

Ignition switch: ON

Battery voltage

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

0V

47

BG

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

R

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

Y

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.)

DLN-60

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: TX15B]

TRANSFER CONTROL UNIT

NOTE:

DTC

CONSULT

Diagnostic item is detected when...

Reference

[P1801] *INITIAL START*

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

DLN-21

[P1802]

CONTROL UNIT (1,2,3)

Malfunction is detected in the memory (RAM) sys-
tem of transfer control unit.

DLN-24

[P1803]

Malfunction is detected in the memory (ROM) sys-
tem of transfer control unit.

[P1804]

Malfunction is detected in the memory (EEPROM)
system of transfer control unit.

[P1807] VHCL SPEED SEN·AT

• Malfunction is detected in output shaft revolution

signal that is output from TCM through CAN
communication.

• Improper signal is input while driving.

DLN-26

[P1808] VHCL SPEED SEN·ABS

• Malfunction is detected in vehicle speed signal

that is output from ABS actuator and electric unit
(control unit) through CAN communication.

• Improper signal is input while driving.

DLN-27

[P1809] CONTROL UNIT 4

AD converter system of transfer control unit is mal-
functioning.

DLN-24

[P1810] 4L POSI SW TF

Improper signal from 4LO switch is input due to
open or short circuit.

DLN-28

[P1811]

BATTERY VOLTAGE

Power supply voltage for transfer control unit is ab-
normally low while driving.

DLN-21

[P1813] 4WD MODE SW

More than two switch inputs are simultaneously de-
tected due to short circuit of 4WD shift switch.

DLN-31

[P1814] 4WD DETECT SWITCH

Improper signal from wait detection switch is input
due to open or short circuit.

DLN-34

[P1816] PNP SW/CIRC

When transmission range switch (A/T models) sig-
nal is malfunctioning.

DLN-37

When PNP switch (M/T models) signal is malfunc-
tioning.

DLN-38

[P1817] SHIFT ACTUATOR

• Motor does not operate properly due to open or

short circuit in actuator motor.

• Malfunction is detected in the actuator motor.

(When 4WD shift switch is operated and actuator
motor is not operated)

• Malfunction is detected in transfer shift high relay

or transfer shift low relay.

DLN-41

[P1818] SHIFT ACT POSI SW

• Improper signal from actuator position switch is

input due to open or short circuit.

• Malfunction is detected in actuator position

switch.

DLN-47

[P1819] SHIFT ACT CIR

• Malfunction is detected in transfer shut off relay

1 and transfer shut off relay 2.

• Malfunction occurs in transfer control device

drive circuit.

DLN-50

[P1820] ENGINE SPEED SIG

• Malfunction is detected in engine speed signal

that is output from ECM through CAN communi-
cation.

• Improper signal is input while driving.

DLN-53

[U1000] CAN COMM CIRCUIT

When transfer control unit is not transmitting or re-
ceiving CAN communication signal for 2 seconds
or more.

DLN-54

[U1010] CONTROL UNIT (CAN)

Detecting error during the initial diagnosis of CAN
controller of transfer control unit.

DLN-55

TRANSFER CONTROL UNIT

DLN-61

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: TX15B]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

If “SHIFT ACT POSI SW [P1818]” or “SHIFT ACT CIR [P1819]” is displayed, first erase self-diagnostic results. (“SHIFT ACT POSI SW
[P1818]” or “SHIFT ACT CIR [P1819]” may be displayed after installing transfer control unit or transfer assembly.)

FLASH CODE CHART

Flashing pattern

Item

Diagnostic item is detected when...

Reference

2

Output shaft revolution
signal (from TCM)

• Malfunction is detected in output shaft revo-

lution signal that is output from TCM through
CAN communication.

• Improper signal is input while driving.

DLN-26

3

Vehicle speed signal
(from ABS)

• Malfunction is detected in vehicle speed sig-

nal that is output from ABS actuator and
electric unit (control unit) through CAN com-
munication.

• Improper signal is input while driving.

DLN-27

4

CAN communication

Malfunction has been detected from CAN
communication.

DLN-14

5

AD converter

AD converter system of transfer control unit is
malfunctioning.

DLN-24

6

4LO switch

Improper signal from 4LO switch is input due
to open or short circuit.

DLN-28

7

Engine speed signal

• Malfunction is detected in engine speed sig-

nal that is output from ECM through CAN
communication.

• Improper signal is input while driving.

DLN-53

8

Power supply

Power supply voltage for transfer control unit is
abnormally low while driving.

DLN-21

9

4WD shift switch

More than two switch inputs are simultaneous-
ly detected due to short circuit of 4WD shift
switch.

DLN-31

10

Wait detection switch

Improper signal from wait detection switch is
input due to open or short circuit.

DLN-34

11

Actuator motor

• Motor does not operate properly due to open

or short circuit in actuator motor.

• Malfunction is detected in the actuator mo-

tor. (When 4WD shift switch is operated and
actuator motor is not operated.)

• Malfunction is detected in transfer shift high

relay or transfer shift low relay.

DLN-41

12

Actuator position
switch

• Improper signal from actuator position

switch is input due to open or short circuit.

• Malfunction is detected in the actuator posi-

tion switch.

DLN-47

13

Transfer control device

• Malfunction is detected in transfer shut off

relay 1 and transfer shut off 2.

• Malfunction occurs in transfer control device

drive circuit.

DLN-50

14

Transmission range
switch signal (A/T mod-
els)

When transmission range switch signal is mal-
functioning.

DLN-37

PNP switch signal (M/T
models)

When PNP switch signal is malfunctioning.

DLN-38

Repeats flickering

every 0.25 sec.

Data erase display

• Power supply failure of memory back-up.
• Battery is disconnected for a long time.
• Battery performance is poor.

DLN-21