Nissan Pathfinder (2012 year). Instruction - part 209

U1010 CONTROL UNIT (CAN)

DLN-237

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TX15B]

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U1010 CONTROL UNIT (CAN)

Description

INFOID:0000000007357533

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec-

tronic control units are equipped onto a vehicle, and each control unit shares information and links with other

control units during operation (not independent). In CAN communication, control units are connected with 2

communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.

Each control unit communicate data but selectively reads required data only.

DTC Logic

INFOID:0000000007357534

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT

1. Turn the ignition switch ON.

2. Perform transfer control unit self-diagnosis. Refer to 

DLN-202, "CONSULT Function (ALL MODE AWD/

4WD)"

.

Is DTC U1010 detected?

YES 

>> Proceed to diagnosis procedure. Refer to 

DLN-237, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000007357535

1.

CHECK TRANSFER CONTROL UNIT CONNECTOR

Check transfer control unit connectors for disconnection and deformation.
Is the inspection result normal? 

YES

>> Replace transfer control unit. Refer to 

DLN-278, "Removal and Installation"

.

NO

>> Repair or replace parts as necessary.

DTC

Display item

Malfunction detected condition

Possible cause

U1010

CONTROL UNIT (CAN)

Detecting error during the initial diagno-
sis of CAN controller of transfer control 
unit.

Malfunction of transfer control unit

August 2012

2012 Pathfinder

DLN-238

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: TX15B]

TRANSFER CONTROL UNIT

ECU DIAGNOSIS INFORMATION

TRANSFER CONTROL UNIT

Reference Value

INFOID:0000000007357536

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” 

position

• 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” 

position

• 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” 

position

• 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

August 2012

2012 Pathfinder

TRANSFER CONTROL UNIT

DLN-239

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: TX15B]

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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” 

position

• 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” 

position

• 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” 

position

• 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” 

position

• 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” 

position

• 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” 

position

• 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

August 2012

2012 Pathfinder

DLN-240

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: TX15B]

TRANSFER CONTROL UNIT

Terminal Layout

AWDIA0620ZZ

Terminal

Wire 

color

Item

Condition

Data (Approx.)

1

L

CAN-H

–

–

2

P

CAN-L

–

–

3

SB

K-LINE (CONSULT signal)

–

–

6

B

Ground

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

O

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

O

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

• 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

August 2012

2012 Pathfinder

TRANSFER CONTROL UNIT

DLN-241

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: TX15B]

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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

35

V

4WD shift indicator lamp
(Rear indicator)

Engine running

Rear indicator of 4WD shift indicator lamp
: ON

0V

Rear indicator of 4WD shift indicator lamp
: OFF

Battery voltage

36

BR

4WD shift indicator lamp
(Front and center indicator)

Front and center indicator of 4WD shift in-
dicator lamp: ON

0V

Front and center indicator of 4WD shift in-
dicator lamp: OFF

Battery voltage

37

O

4LO indicator lamp

4LO indicator lamp: ON

0V

4LO indicator lamp: OFF

Battery voltage

38

GR

4WD warning lamp

4WD warning lamp: ON

0V

4WD warning lamp: OFF

Battery voltage

39

LG

ATP warning lamp

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

ver “P” position

• Brake pedal de-

pressed

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

Battery voltage

Except the above

0V

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

Terminal

Wire 

color

Item

Condition

Data (Approx.)

August 2012

2012 Pathfinder

DLN-242

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: TX15B]

TRANSFER CONTROL UNIT

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:0000000007357537

DTC CHART

47

O

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.)

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-206

[P1802]

CONTROL UNIT (1,2,3)

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

DLN-209

[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-211

[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-212

[P1809] CONTROL UNIT 4

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

DLN-209

[P1810] 4L POSI SW TF

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

DLN-213

[P1811]

BATTERY VOLTAGE

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

DLN-206

[P1813] 4WD MODE SW

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

DLN-216

[P1814] 4WD DETECT SWITCH

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

DLN-219

[P1816] PNP SW/CIRC

When transmission range switch signal is malfunc-
tion or communication error between the modules.

DLN-222

August 2012

2012 Pathfinder

TRANSFER CONTROL UNIT

DLN-243

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: TX15B]

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NOTE:

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

[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-223

[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-230

[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-233

[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-236

[U1010] CONTROL UNIT (CAN)

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

DLN-237

DTC

CONSULT

Diagnostic item is detected when...

Reference

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-211

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-212

4

CAN communication

Malfunction has been detected from CAN 
communication.

DLN-199

5

AD converter

AD converter system of transfer control unit is 
malfunctioning.

DLN-209

6

4LO  switch

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

DLN-213

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-236

8

Power supply

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

DLN-206

9

4WD shift switch

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

DLN-216

10

Wait detection switch

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

DLN-219

August 2012

2012 Pathfinder

DLN-244

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: TX15B]

TRANSFER CONTROL UNIT

NOTE:

If actuator position switch” or transfer control device” is displayed, first erase self-diagnostic results. (They may be displayed after install-
ing transfer control unit or transfer assembly.)

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-223

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-230

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-233

14

Transmission range 
switch signal

Transmission range switch signal is malfunc-
tion or communication error between the mod-
ules.

DLN-222

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-206

Repeats flickering 

every 2 to 5 sec.

—

Circuits that the self-diagnosis covers have no 
malfunction.

—

No flickering

Transmission range 
switch or 4WD shift 
switch

Transmission range switch or 4WD shift switch 
circuit is shorted or open.

DLN-222

 or 

DLN-216

Flashing pattern

Item

Diagnostic item is detected when...

Reference

August 2012

2012 Pathfinder