Nissan Pathfinder (2011 year). Manual - part 212

DLN-234

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TX15B]

P1819 TRANSFER CONTROL DEVICE

4. Turn ignition switch “ON”. (Do not start engine.)

5. Check voltage between transfer control unit harness connector

terminals and ground.

Are the inspection results normal?

YES

>> GO TO 2.

NO

>> Check the following. If any items are damaged, repair

or replace damaged parts.

• 10A fuse (No. 57, located in the fuse and relay box).

• 40A fuse (No. 

J

, located in the fuse and fusible link box).

• Harness for short or open between battery and transfer shut off relay 1 harness connector E156

terminal 3.

• Harness for short or open between transfer control unit harness connector M166 terminal 27

and transfer shut off relay 1 harness connector E156 terminal 5.

• Harness for short or open between ignition switch and transfer shut off relay 1 harness connec-

tor E156 terminal 1.

• Harness for short or open between transfer shut off relay 1 harness connector E156 terminal 2

and ground.

• Harness for short or open between ignition switch and transfer control unit harness connector

M165 terminal 25.

• Battery and ignition switch.

• Transfer shut off relay 1. Refer to 

DLN-208, "Component Inspection"

.

2.

CHECK GROUND CIRCUIT

1. Turn ignition switch "OFF".

2. Disconnect transfer control unit harness connector.

3. Check continuity between transfer control unit harness connec-

tor M166 terminal 32 and ground.

Also check harness for short to power.

Is there continuity?

YES

>> GO TO 3.

NO

>> Repair open circuit or short to power in harness or con-

nectors.

3.

CHECK POWER SUPPLY SIGNAL

1. Turn ignition switch “OFF”.  (Stay for at least 5 seconds.)

2. Connect transfer control unit harness connector.

3. Check voltage between transfer control unit harness connector

terminal and ground.

Connector

Terminal

Voltage (Approx.)

M165

25 - Ground

Battery voltage

M166

27 - Ground

SDIA3372E

Continuity should exist.

SDIA2818E

Connector

Terminal

Voltage (Approx.)

M166

40 - Ground

Battery voltage

SDIA2819E

2011 Pathfinder

P1819 TRANSFER CONTROL DEVICE

DLN-235

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TX15B]

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4. Turn ignition switch “ON”. (Do not start engine.)

5. Check voltage between transfer control unit harness connector

terminal and ground.

Are the inspection results normal?

YES

>> GO TO 4.

NO

>> Check the following. If any items are damaged, repair

or replace damaged parts.

• Harness for short or open between battery and trans-

fer shut off relay 2 harness connector E157 terminal 1.

• Harness for short or open between transfer shut off relay 2 harness connector E157 terminal 2

and transfer control unit harness connector M166 terminal 40.

• Transfer shut off relay 2.

4.

CHECK TRANSFER CONTROL UNIT

Check transfer control unit input/output signal. Refer to 

DLN-238, "Reference Value"

.

Are the inspection results normal?

YES

>> GO TO 5 (With CONSULT-III) or GO TO 6 (Without CONSULT-III).

NO

>> Check transfer control unit pin terminals for damage or loose connection with harness connector.

If any items are damaged, repair or replace damaged parts.

5.

PERFORM SELF-DIAGNOSIS (WITH CONSULT-III)

With CONSULT-III

1. Turn ignition switch “ON”. (Do not start engine.)

2. Select “SELF-DIAG RESULTS” mode for “ALL MODE AWD/4WD” with CONSULT-III.

3. Touch “ERASE”.

4. Turn ignition switch “OFF” and wait at least 10 seconds.

5. Perform the self-diagnosis again.
Is the “SHIFT ACT CIR [P1819]” displayed?

YES

>> Replace transfer control unit. Refer to 

DLN-277, "Removal and Installation"

.

NO

>> Inspection End.

6.

PERFORM SELF-DIAGNOSIS (WITHOUT CONSULT-III)

Without CONSULT-III

1. Perform the self-diagnosis and then erase self-diagnostic results. Refer to 

DLN-202, "CONSULT-III Func-

tion (ALL MODE AWD/4WD)"

.

2. Perform the self-diagnosis again.
Do the self-diagnostic results indicate transfer control device?

YES

>> Replace transfer control unit. Refer to 

DLN-277, "Removal and Installation"

.

NO

>> Inspection End.

Connector

Terminal

Voltage (Approx.)

M166

40 - Ground

0V

SDIA2820E

2011 Pathfinder

DLN-236

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TX15B]

P1820 ENGINE SPEED SIGNAL

P1820 ENGINE SPEED SIGNAL

Description

INFOID:0000000006245099

The ECM transmits the engine speed signal via CAN communication to the transfer control unit.  DTC P1820

will set when either of the following occur:

• Malfunction is detected in engine speed signal that is output from the ECM.

• Improper signal is input while driving.

DTC Logic

INFOID:0000000006245100

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Perform self-diagnosis.
Is DTC P1820 detected?

YES

>> Perform diagnosis procedure. Refer to 

DLN-236, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000006245101

1.

CHECK DTC WITH ECM

Perform self-diagnosis with ECM. Refer to 

EC-77, "CONSULT-III Function"

.

Is any malfunction detected by self-diagnosis?

YES

>> Check the malfunctioning system.

NO

>> GO TO 2.

2.

CHECK TRANSFER CONTROL UNIT

Check transfer control unit input/output signal. Refer to 

DLN-238, "Reference Value"

.

Are the inspection results normal?

YES

>> GO TO 3.

NO

>> Check transfer control unit pin terminals for damage or loose connection with harness connector.

If any items are damaged, repair or replace damaged parts.

3.

CHECK DTC

Perform the self-diagnosis, after driving a vehicle for a while.
Is DTC P1820 displayed?

YES

>> Perform self-diagnosis with ECM again.

NO

>> Inspection End.

DTC

CONSULT-III

Diagnostic item is detected when...

Reference

[P1820]

ENGINE SPEED SIG

• Malfunction is detected in engine 

speed signal that is output from ECM 
through CAN communication.

• Improper signal is input while driving.

DLN-236

2011 Pathfinder

U1010 CONTROL UNIT (CAN)

DLN-237

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TX15B]

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U1010 CONTROL UNIT (CAN)

Description

INFOID:0000000006689829

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:0000000006689830

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1. Turn the ignition switch ON.

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

DLN-202, "CONSULT-III 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:0000000006689831

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-277, "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

2011 Pathfinder

DLN-238

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: TX15B]

TRANSFER CONTROL UNIT

ECU DIAGNOSIS INFORMATION

TRANSFER CONTROL UNIT

Reference Value

INFOID:0000000006245102

VALUE ON THE DIAGNOSIS TOOL

CONSULT-III 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

2011 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

2011 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-III 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

2011 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.)

2011 Pathfinder