Nissan Pathfinder (2012 year). Instruction — part 191
TRANSFER CONTROL UNIT
DLN-93
< ECU DIAGNOSIS INFORMATION >
[TRANSFER: ATX14B]
C
E
F
G
H
I
J
K
L
M
A
B
DLN
N
O
P
10
P
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
11
BR
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
0V
12
O
4LO indicator lamp
4LO indicator lamp: OFF
Battery voltage
4LO indicator lamp: ON
0V
13
G
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
0V
14
V
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)
0V
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)
0V
15
LG
ATP warning lamp
ATP indicator lamp: ON
0V
ATP indicator lamp: OFF
Battery voltage
16
Y
Power supply
Ignition switch: ON
Battery voltage
Ignition switch: OFF
(5 seconds after ignition switch is turned OFF)
0V
18
O
4WD shift switch
(4H)
Ignition switch: ON
4WD shift switch: 4H
Battery voltage
4WD shift switch: 2WD, AUTO or 4LO
0V
19
R
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
21
B
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
0V
22
GR
Power supply
Ignition switch: ON
Battery voltage
Ignition switch: OFF
(5 seconds after ignition switch is turned OFF)
0V
23
W
4WD shift switch
(4LO)
Ignition switch: ON
4WD shift switch: 4LO
Battery voltage
4WD shift switch: 2WD, AUTO or 4H
0V
24
LG
4WD shift switch
(AUTO)
Ignition switch: ON
4WD shift switch: AUTO
Battery voltage
4WD shift switch: 2WD, 4H or 4LO
0V
Terminal
Wire
color
Item
Condition
Data (Approx.)
August 2012
2012 Pathfinder
DLN-94
< ECU DIAGNOSIS INFORMATION >
[TRANSFER: ATX14B]
TRANSFER CONTROL UNIT
25
Y
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
→
0V
4WD shift switch: 4LO to 4H (While actua-
tor motor is operating.)
0V
→
Battery
voltage
4WD shift switch: 4LO
0V
27
W
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
0V
4WD shift switch: 4LO
Battery voltage
28
P
Sensor ground
Always
0V
29
W/G
Ignition switch monitor
Ignition switch: ON
Battery voltage
Ignition switch: OFF
0V
30
V
Shut off relay
Ignition switch: ON
0V
Ignition switch: OFF
(5 seconds after ignition switch is turned OFF)
Battery voltage
31
G
Transfer fluid temperature
sensor
Ignition switch: ON
Transfer fluid temperature approx. 20
°
C
(68
°
F)
1.1V
Transfer fluid temperature approx. 80
°
C
(176
°
F)
0.3V
33
GR
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
0V
34
BR
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.)
0V
• Vehicle stopped
• Engine running
4WD shift switch: 2WD (“Wait” function is
not operating.)
Battery voltage
35
L
Line pressure switch
• Ignition switch: ON
• A/T selector lever “D” position
• 4WD shift switch: AUTO
0V
• 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
40
R
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.)
0V
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]
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:0000000007357438
DTC CHART
41
SB
Transfer motor relay moni-
tor
• Accelerator pedal
depressed
• Vehicle stopped
• Engine running
• Brake pedal de-
pressed
4WD shift switch: 2WD
0V
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
42
Y
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
0V
43
O
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
→
0V
4WD shift switch: 4LO to 4H (While actua-
tor motor is operating.)
0V
→
Battery
voltage
4WD shift switch: 4LO
0V
44
LG
Actuator position switch 1
(Low)
• Vehicle stopped
• Engine running
• A/T selector lever
“N” position
• Brake pedal de-
pressed
4WD shift switch: 4LO
0V
4WD shift switch: 2WD, AUTO or 4H
Battery voltage
45
B
Ground
Always
0V
47
R
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
[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.
[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.
[P1809]
CONTROL UNIT 4
AD converter system of transfer control unit is mal-
functioning.
[P1810]
4L POSI SW TF
Improper signal from neutral-4LO switch is input due
to open or short circuit.
[P1811]
BATTERY VOLTAGE
Power supply voltage for transfer control unit is ab-
normally low while driving.
[P1813]
4WD MODE SW
More than two switch inputs are simultaneously de-
tected due to short circuit of 4WD shift switch.
[P1814]
4WD DETECT SWITCH
Improper signal from wait detection switch is input
due to open or short circuit.
[P1816]
PNP SW/CIRC
When transmission range switch signal is malfunc-
tion or communication error between the control
units.
[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.
[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.
[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.
[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.
[P1822]
DUTY SOLENOID
Proper voltage is not applied to clutch pressure so-
lenoid valve due to open or short circuit.
[P1823]
2-4WD SOLENOID
Proper voltage is not applied to 2-4WD solenoid
valve due to open or short circuit.
[P1824]
MOTOR RELAY
Motor does not operate properly due to open or
short circuit in transfer motor or transfer motor relay.
[P1826]
OIL TEMP SEN
Signal voltage from transfer fluid temperature sen-
sor is abnormally high (Transfer fluid temperature is
abnormally low) while driving.
[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.
DTC
CONSULT
Diagnostic item is detected when...
Reference
August 2012
2012 Pathfinder
TRANSFER CONTROL UNIT
DLN-97
< ECU DIAGNOSIS INFORMATION >
[TRANSFER: ATX14B]
C
E
F
G
H
I
J
K
L
M
A
B
DLN
N
O
P
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
[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
[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
[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
[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
[U1010]
CONTROL UNIT (CAN)
Detecting error during the initial diagnosis of CAN
controller of transfer control unit.
Refer to
DTC
CONSULT
Diagnostic item is detected when...
Reference
Flashing pattern
Item
Diagnostic item is detected when...
Reference
2
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.
.
3
Clutch pressure sole-
noid signal
Proper voltage is not applied to clutch pressure solenoid
valve due to open or short circuit.
.
4
2-4WD solenoid signal
Proper voltage is not applied to 2-4WD solenoid valve due
to open or short circuit.
.
5
Transfer motor
Transfer motor does not operate properly due to open or
short circuit in transfer motor or transfer motor relay.
.
6
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.
.
7
CAN communication
Malfunction has been detected from CAN communication
line.
8
AD converter
AD converter system of transfer control unit is malfunction-
ing.
.
9
Transfer fluid tempera-
ture
Signal voltage from transfer fluid temperature sensor is ab-
normally high (Transfer fluid temperature is abnormally low)
while driving.
.
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.
10
Neutral-4LO switch
Improper signal from neutral-4LO switch is input due to
open or short circuit.
11
Clutch pressure switch
• Improper signal is input due to open or short circuit.
• Malfunction occurs in clutch pressure switch or hydraulic
circuit.
12
Line pressure switch
• Improper signal is input due to open or short circuit.
• Malfunction occurs in line pressure switch or hydraulic
circuit.
Refer to
13
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
14
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
15
Power supply
Power supply voltage for transfer control unit is abnormally
low while driving.
Refer to
16
4WD shift switch
More than two switch inputs are simultaneously detected
due to short circuit of 4WD shift switch.
Refer to
17
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
18
Wait detection switch
Improper signal from wait detection switch is input due to
open or short circuit.
Refer to
19
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
20
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
21
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
22
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
23
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
24
Transmission range
switch signal (from
TCM)
Transmission range switch signal is malfunction or commu-
nication error between the control units.
Refer to
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.
No flickering
Transmission range
switch or 4WD shift
switch
Transmission range switch or 4WD shift switch circuit is
shorted or open.
.
Flashing pattern
Item
Diagnostic item is detected when...
Reference
August 2012
2012 Pathfinder
TRANSFER CONTROL UNIT
DLN-99
< ECU DIAGNOSIS INFORMATION >
[TRANSFER: ATX14B]
C
E
F
G
H
I
J
K
L
M
A
B
DLN
N
O
P
• 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
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