Content .. 189 190 191 192 ..

Nissan Pathfinder (2012 year). Manual - part 191

TRANSFER CONTROL UNIT

DLN-93

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: ATX14B]

DLN

Transfer dropping resistor

• Vehicle stopped
• Engine running
• A/T selector lever

“N” position

• Brake pedal de-

pressed

4WD shift switch: AUTO

4 - 14V

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

Less than 1V

4WD shift indicator lamp
(Lock indicator lamp)

Lock indicator lamp of 4WD shift indicator lamp: OFF

Battery voltage

Lock indicator lamp of 4WD shift indicator lamp: ON

4LO indicator lamp

4LO indicator lamp: OFF

Battery voltage

4LO indicator lamp: ON

Transfer shift low relay

• Vehicle stopped
• Engine running
• A/T selector lever

“N” position

• Brake pedal de-

pressed

4WD shift switch: 4LO to 4H (“Wait” func-
tion is operating.)

Battery voltage

Except the above

Transfer motor relay

• Accelerator pedal

depressed

• Vehicle stopped
• Engine running
• Brake pedal de-

pressed

4WD shift switch: 2WD

Battery voltage

4WD shift switch: AUTO or 4LO (A/T selec-
tor lever “P” or “N” position)

Battery voltage
(0V for approx.
2 sec. after
shifting to “P”
and “N”.)

4WD shift switch: AUTO or 4LO (Except for
A/T selector lever “P” or “N” position)

4WD shift switch: 4H (A/T selector lever
“P” position)

Battery voltage
(0V for approx.
2 sec. after
shifting to “P”.)

4WD shift switch: 4H (Except for A/T selec-
tor lever “P” position)

ATP warning lamp

ATP indicator lamp: ON

ATP indicator lamp: OFF

Battery voltage

Power supply

Ignition switch: ON

Battery voltage

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

4WD shift switch
(4H)

Ignition switch: ON

4WD shift switch: 4H

Battery voltage

4WD shift switch: 2WD, AUTO or 4LO

Clutch pressure solenoid
valve

• Vehicle stopped
• Engine running
• A/T selector lever

“N” position

• Brake pedal de-

pressed

4WD shift switch: AUTO

1.5 - 3V

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

Less than 1V

4WD shift indicator lamp
(AUTO indicator lamp)

AUTO indicator lamp of 4WD shift indicator lamp: OFF

Battery voltage

AUTO indicator lamp of 4WD shift indicator lamp: ON

Power supply

Ignition switch: ON

Battery voltage

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

4WD shift switch
(4LO)

Ignition switch: ON

4WD shift switch: 4LO

Battery voltage

4WD shift switch: 2WD, AUTO or 4H

4WD shift switch
(AUTO)

Ignition switch: ON

4WD shift switch: AUTO

Battery voltage

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

Terminal

Wire

color

Item

Condition

Data (Approx.)

August 2012

2012 Pathfinder

DLN-94

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: ATX14B]

TRANSFER CONTROL UNIT

Neutral-4LO switch

• Vehicle stopped
• Engine running
• A/T selector lever

“N” position

• Brake pedal de-

pressed

4WD shift switch: 2WD, AUTO or 4H

Battery voltage

4WD shift switch: 4H to 4LO (While actua-
tor motor is operating.)

Battery voltage

→

4WD shift switch: 4LO to 4H (While actua-
tor motor is operating.)

→

Battery

voltage

4WD shift switch: 4LO

Actuator position switch 2
(High)

• Vehicle stopped
• Engine running
• A/T selector lever

“N” position

• Brake pedal de-

pressed

4WD shift switch: 4H, AUTO or 2WD

4WD shift switch: 4LO

Battery voltage

Sensor ground

Always

W/G

Ignition switch monitor

Ignition switch: ON

Battery voltage

Ignition switch: OFF

Shut off relay

Ignition switch: ON

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

Battery voltage

Transfer fluid temperature
sensor

Ignition switch: ON

Transfer fluid temperature approx. 20

(68

1.1V

Transfer fluid temperature approx. 80

(176

0.3V

Transfer shift high relay
monitor

• Vehicle stopped
• Engine running
• A/T selector lever

“N” position

• Brake pedal de-

pressed

4WD shift switch: 4H to 4LO (“Wait” func-
tion is operating.)

Battery voltage

Except the above

Clutch pressure switch

• Vehicle stopped
• Engine running
• A/T selector lever

“D” position

4WD shift switch: AUTO or 4H (“Wait” func-
tion is not operating.)

• Vehicle stopped
• Engine running

4WD shift switch: 2WD (“Wait” function is
not operating.)

Battery voltage

Line pressure switch

• Ignition switch: ON
• A/T selector lever “D” position
• 4WD shift switch: AUTO

• After the vehicle

has been left at
room temperature
for 5 minutes and
more with ignition
switch in “OFF” po-
sition.

• Ignition switch: ON
• A/T selector lever: “P” or "N" position
• 4WD shift switch: other than AUTO

Battery voltage

ATP switch

• Vehicle stopped
• Engine running
• A/T selector lever

“N”

• Brake pedal de-

pressed

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

Except the above

Battery voltage

Terminal

Wire

color

Item

Condition

Data (Approx.)

August 2012

2012 Pathfinder

TRANSFER CONTROL UNIT

DLN-95

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: ATX14B]

DLN

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:0000000007357438

DTC CHART

Transfer motor relay moni-
tor

• Accelerator pedal

depressed

• Vehicle stopped
• Engine running
• Brake pedal de-

pressed

4WD shift switch: 2WD

4WD shift switch: AUTO or 4LO (A/T selec-
tor lever “P” or “N” position)

0V
(Battery volt-
age for approx.
2 sec. after
shifting to “P”
and “N”.)

4WD shift switch: AUTO or 4LO (Except for
A/T selector lever “P” or “N” position)

Battery voltage

4WD shift switch: 4H (A/T selector lever
“P” position)

0V
(Battery volt-
age for approx.
2 sec. after
shifting to “P”.)

4WD shift switch: 4H (Except for A/T selec-
tor lever “P” position)

Battery voltage

Transfer shift low relay
monitor

• Vehicle stopped
• Engine running
• A/T selector lever

“N” position

• Brake pedal de-

pressed

4WD shift switch: 4LO to 4H (“Wait” func-
tion is operating.)

Battery voltage

Except the above

Wait detection switch

• Vehicle stopped
• Engine running
• A/T selector lever

“N” position

• Brake pedal de-

pressed

4WD shift switch: 2WD, AUTO or 4H

Battery voltage

4WD shift switch: 4H to 4LO (While actua-
tor motor is operating.)

Battery voltage

→

4WD shift switch: 4LO to 4H (While actua-
tor motor is operating.)

→

Battery

voltage

4WD shift switch: 4LO

Actuator position switch 1
(Low)

• Vehicle stopped
• Engine running
• A/T selector lever

“N” position

• Brake pedal de-

pressed

4WD shift switch: 4LO

4WD shift switch: 2WD, AUTO or 4H

Battery voltage

Ground

Always

Power supply
(Memory back-up)

Ignition switch: ON

Battery voltage

Ignition switch: OFF

Battery voltage

Terminal

Wire

color

Item

Condition

Data (Approx.)

DTC

CONSULT

Diagnostic item is detected when...

Reference

[P1802]

CONTROL UNIT 1

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

Refer to

DLN-31

[P1803]

CONTROL UNIT 2

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

[P1804]

CONTROL UNIT 3

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

August 2012

2012 Pathfinder

DLN-96

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: ATX14B]

TRANSFER CONTROL UNIT

[P1807]

VHCL SPEED SEN·AT

• Malfunction is detected in output shaft revolution

signal that is output from TCM through CAN com-
munication.

• Improper signal is input while driving.

Refer to

DLN-33

[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.

Refer to

DLN-34

[P1809]

CONTROL UNIT 4

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

Refer to

DLN-31

[P1810]

4L POSI SW TF

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

Refer to

DLN-35

[P1811]

BATTERY VOLTAGE

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

Refer to

DLN-28

[P1813]

4WD MODE SW

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

Refer to

DLN-38

[P1814]

4WD DETECT SWITCH

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

Refer to

DLN-42

[P1816]

PNP SW/CIRC

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

Refer to

DLN-45

[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

and transfer shift low relay.

Refer to

DLN-46

[P1818]

SHIFT ACT POSI SW

• Improper signal from actuator position switch is in-

put due to open or short circuit.

• Malfunction is detected in the actuator position

switch.

Refer to

DLN-52

[P1819]

SHIFT ACT CIR

• Transfer control device actuator circuit is shorted

or open. (Malfunctions are detected when transfer
shift relay circuit is open/shorted or relay monitor
circuit is open/shorted.)

• Malfunction occurs in transfer control device drive

circuit.

• Malfunction is detected in transfer shut off relay.

Refer to

DLN-55

[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.

Refer to

DLN-59

[P1822]

DUTY SOLENOID

Proper voltage is not applied to clutch pressure so-
lenoid valve due to open or short circuit.

Refer to

DLN-60

[P1823]

2-4WD SOLENOID

Proper voltage is not applied to 2-4WD solenoid
valve due to open or short circuit.

Refer to

DLN-64

[P1824]

MOTOR RELAY

Motor does not operate properly due to open or
short circuit in transfer motor or transfer motor relay.

Refer to

DLN-68

[P1826]

OIL TEMP SEN

Signal voltage from transfer fluid temperature sen-
sor is abnormally high (Transfer fluid temperature is
abnormally low) while driving.

Refer to

DLN-74

[P1827]

CLUTCH PRES SW

• Improper signal from clutch pressure switch is in-

put due to open or short circuit.

• Malfunction occurs in clutch pressure switch or

hydraulic circuit.

Refer to

DLN-77

DTC

CONSULT

Diagnostic item is detected when...

Reference

August 2012

2012 Pathfinder

TRANSFER CONTROL UNIT

DLN-97

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: ATX14B]

DLN

CAUTION:

• If CAN COMM CIRCUIT [U1000] or CONTROL UNIT (CAN) [U1010] are displayed with other DTCs, first perform the trouble

diagnosis for CAN communication line.

• If ABS OP SIG [P1830], VDC OP SIG [P1831] or TCS OP SIG [P1832] is displayed, first perform the trouble diagnosis for ABS

system.

• If VHCL SPEED SEN·AT [P1807] is displayed, first perform the trouble diagnosis for A/T system.
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.)

• If CL PRES SW [P1827] or LINE PRES SW [P1828] is displayed only while driving in reverse, check the continuity of R position on

transmission range switch. When there is no malfunction found in the electrical system, check the hydraulic system.

FLASH CODE CHART

[P1828]

LINE PRES SW

• Improper signal from line pressure switch is input

due to open or short circuit.

• Malfunction occurs in line pressure switch or hy-

draulic circuit.

Refer to

DLN-80

[P1829]

THROTTLE POSI SEN

• Malfunction is detected in accelerator pedal posi-

tion signal that is output from ECM through CAN
communication.

• Signal voltage from accelerator pedal position

sensor is abnormally high or low.

Refer to

DLN-83

[P1830]

ABS OP SIG

Malfunction is detected in ABS operation signal that
is output from ABS actuator and electric unit (control
unit) through CAN communication.

Refer to

DLN-84

[P1831]

VDC OP SIG

Malfunction is detected in VDC operation signal that
is output from ABS actuator and electric unit (control
unit) through CAN communication.

Refer to

DLN-85

[P1832]

TCS OP SIG

Malfunction is detected in TCS operation signal that
is output from ABS actuator and electric unit (control
unit) through CAN communication.

Refer to

DLN-86

[U1010]

CONTROL UNIT (CAN)

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

Refer to

DLN-87

DTC

CONSULT

Diagnostic item is detected when...

Reference

Flashing pattern

Item

Diagnostic item is detected when...

Reference

Vehicle speed signal
(from A/T)

• Malfunction is detected in output shaft revolution signal

that is output from TCM through CAN communication.

• Improper signal is input while driving.

Refer to

DLN-33

Clutch pressure sole-
noid signal

Proper voltage is not applied to clutch pressure solenoid
valve due to open or short circuit.

Refer to

DLN-60

2-4WD solenoid signal

Proper voltage is not applied to 2-4WD solenoid valve due
to open or short circuit.

Refer to

DLN-64

Transfer motor

Transfer motor does not operate properly due to open or
short circuit in transfer motor or transfer motor relay.

Refer to

DLN-68

Vehicle speed signal
(from ABS)

• Malfunction is detected in vehicle speed signal that is out-

put from ABS actuator and electric unit (control unit)
through CAN communication.

• Improper signal is input while driving.

Refer to

DLN-34

CAN communication

Malfunction has been detected from CAN communication
line.

Refer to

DLN-20

AD converter

AD converter system of transfer control unit is malfunction-
ing.

Refer to

DLN-31

Transfer fluid tempera-
ture

Signal voltage from transfer fluid temperature sensor is ab-
normally high (Transfer fluid temperature is abnormally low)
while driving.

Refer to

DLN-74

August 2012

2012 Pathfinder

DLN-98

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: ATX14B]

TRANSFER CONTROL UNIT

CAUTION:

• If CAN communication is displayed with other DTCs, first perform the trouble diagnosis for CAN communication line.

Neutral-4LO switch

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

Refer to

DLN-35

Clutch pressure switch

• Improper signal is input due to open or short circuit.
• Malfunction occurs in clutch pressure switch or hydraulic

circuit.

Refer to

DLN-77

Line pressure switch

• Improper signal is input due to open or short circuit.
• Malfunction occurs in line pressure switch or hydraulic

circuit.

Refer to

DLN-80

Engine speed signal
(from ECM)

• Malfunction is detected in engine speed signal that is out-

put from ECM through CAN communication.

• Improper signal is input while driving.

Refer to

DLN-59

Accelerator pedal posi-
tion sensor (from
ECM)

• Malfunction is detected in accelerator pedal position sig-

nal that is output from ECM through CAN communication.

• Signal voltage from accelerator pedal position sensor is

abnormally high or low.

Refer to

DLN-83

Power supply

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

Refer to

DLN-28

4WD shift switch

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

Refer to

DLN-38

ABS operation signal
(from ABS)

Malfunction is detected in ABS operation signal that is out-
put from ABS actuator and electric unit (control unit)
through CAN communication.

Refer to

DLN-84

Wait detection switch

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

Refer to

DLN-42

Actuator motor

• Motor does not operate properly due to open or short cir-

cuit 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 and

transfer shift low relay.

Refer to

DLN-46

Actuator position
switch

• Improper signal from actuator position switch is input due

to open or short circuit.

• Malfunction is detected in the actuator position switch.

Refer to

DLN-52

Actuator circuit

• Transfer control device actuator circuit is shorted or open.

(Malfunctions are detected when motor relay circuit is
open/shorted or relay transfer shift circuit is open/short-
ed.)

• Malfunction occurs in transfer control device drive circuit.

Refer to

DLN-55

VDC operation signal
(from VDC)

Malfunction is detected in VDC operation signal that is out-
put from ABS actuator and electric unit (control unit)
through CAN communication.

Refer to

DLN-85

TCS operation signal
(from TCS)

Malfunction is detected in TCS operation signal that is out-
put from ABS actuator and electric unit (control unit)
through CAN communication.

Refer to

DLN-86

Transmission range
switch signal (from
TCM)

Transmission range switch signal is malfunction or commu-
nication error between the control units.

Refer to

DLN-45

Repeats flickering
every 2 to 5 sec.

—

System normal.

—

Repeats flickering
every 0.25 sec.

Data erase display

• Power supply failure of memory back-up.
• Battery performance is poor.

Refer to

DLN-28

No flickering

Transmission range
switch or 4WD shift
switch

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

Refer to

DLN-45

DLN-38

Flashing pattern

Item

Diagnostic item is detected when...

Reference

August 2012

2012 Pathfinder

TRANSFER CONTROL UNIT

DLN-99

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: ATX14B]

DLN

• If ABS operation signal, VDC operation signal or TCS operation signal is displayed, first perform the trouble diagnosis for

ABS system.

• If Output shaft revolution signal is displayed, first perform the trouble diagnosis for A/T system.
NOTE:

• If actuator position switch or actuator circuit is displayed, first erase self-diagnostic results. (Actuator position switch or actuator circuit

may be displayed after installing transfer control unit or transfer assembly.)

• If clutch pressure switch or line pressure switch is displayed only while driving in reverse, check the continuity of R position on trans-

mission range switch. When there is no malfunction found in the electrical system, check the hydraulic system.

August 2012

2012 Pathfinder

DLN-100

< WIRING DIAGRAM >

[TRANSFER: ATX14B]

ALL-MODE 4WD SYSTEM

WIRING DIAGRAM

ALL-MODE 4WD SYSTEM

Wiring Diagram

INFOID:0000000007357439

ABDWA0524GB

August 2012

2012 Pathfinder

Content .. 189 190 191 192 ..