Infiniti QX56 (JA60). Manual - part 290

TRANSFER CONTROL UNIT

DLN-83

< ECU DIAGNOSIS >

[ATX14B]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

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 condition.

Approximately 
equal to the indica-
tion on speedome-
ter (Inside of 
±10%)

COMP CL TORQ [kgm]

Condition of control 
torque

• Vehicle stopped
• Engine running
• A/T selector lever N posi-

tion

• Brake pedal depressed

4WD shift switch: 2WD

0 kg-m

4WD shift switch: AUTO

39 - 1,353 N·m

(4 - 138 kg-m, 29 - 

998 ft-lb)

4WD shift switch: 4H or 
4LO

1,353 N·m

(138 kg-m, 998 ft-

lb)

DUTY SOLENOID [%]

Condition of clutch pres-
sure solenoid

• Vehicle stopped
• Engine running
• A/T selector lever N posi-

tion

• Brake pedal depressed

4WD shift switch: 2WD

4%

4WD shift switch: AUTO

96 - 4%

4WD shift switch: 4H or 
4LO

4%

2-4WD SOL [ON/OFF]

Condition of 2-4WD shift 
solenoid valve

• Vehicle stopped
• Engine running
• A/T selector lever N posi-

tion

• Brake pedal depressed

4WD shift switch: 2WD

OFF

4WD shift switch: AUTO

ON

4WD shift switch: 4H

4WD shift switch: 4LO

4WD shift switch: AUTO 
(Wait function is operat-
ing.)

OFF

4WD shift switch: 4H 
(Wait function is operat-
ing.)

OFF

2-4WD SOL MON [ON/
OFF]

Check signal for transfer 
control unit signal output

• Vehicle stopped
• Engine running
• A/T selector lever N posi-

tion

• Brake pedal depressed

4WD shift switch: 2WD

OFF

4WD shift switch: AUTO

ON

4WD shift switch: 4H

4WD shift switch: 4LO

4WD shift switch: AUTO 
(Wait function is operat-
ing.)

OFF

4WD shift switch: 4H 
(Wait function is operat-
ing.)

OFF

MOTOR RELAY [ON/
OFF]

Condition of transfer mo-
tor relay

• Accelerator pedal de-

pressed

• Vehicle stopped
• Engine running
• Brake pedal depressed

4WD shift switch: 2WD

OFF

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

OFF

(ON for approx. 2 

sec. after shifting 

to P and N.)

4WD shift switch: AUTO 
or 4LO (Except for A/T se-
lector lever P or N posi-
tion)

ON

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

OFF

(ON for approx. 2 

sec. after shifting 

to P.)

4WD shift switch: 4H (Ex-
cept for A/T selector lever 
P position)

ON

Monitored item [Unit]

Content

Condition

Display value

DLN-84

< ECU DIAGNOSIS >

[ATX14B]

TRANSFER CONTROL UNIT

MOTOR RLY MON [ON/
OFF]

Check signal for transfer 
control unit signal output

• Accelerator pedal de-

pressed

• Vehicle stopped
• Engine running
• Brake pedal depressed

4WD shift switch: 2WD

OFF

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

OFF

(ON for approx. 2 

sec. after shifting 

to P and N.)

4WD shift switch: AUTO 
or 4LO (Except for A/T se-
lector lever P or N posi-
tion)

ON

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

OFF

(ON for approx. 2 

sec. after shifting 

to P.)

4WD shift switch: 4H (Ex-
cept for A/T selector lever 
P position)

ON

4WD FAIL LAMP [ON/
OFF]

Condition of 4WD warn-
ing lamp

4WD warning lamp: ON

ON

4WD warning lamp: OFF

OFF

2WD IND [ON/OFF]

Condition of 4WD shift in-
dicator lamp (2WD indi-
cator lamp)

2WD indicator lamp of 4WD shift indicator lamp: OFF

OFF

2WD indicator lamp of 4WD shift indicator lamp: ON

ON

AUTO IND [ON/OFF]

Condition of 4WD shift in-
dicator lamp (AUTO indi-
cator lamp)

AUTO indicator lamp of 4WD shift indicator lamp: OFF

OFF

AUTO indicator lamp of 4WD shift indicator lamp: ON

ON

LOCK IND [ON/OFF]

Condition of 4WD shift in-
dicator lamp (Lock indi-
cator lamp)

Lock indicator lamp of 4WD shift indicator lamp: OFF

OFF

Lock indicator lamp of 4WD shift indicator lamp: ON

ON

4L IND [ON/OFF]

Condition of 4LO indica-
tor lamp condition

4LO indicator lamp: OFF

OFF

4LO indicator lamp: ON

ON

ATP IND [ON/OFF]

Condition of ATP indica-
tor lamp 

ATP indicator lamp: ON

ON

ATP indicator lamp: OFF

OFF

SHIFT POS SW1 [ON/
OFF]

Condition of actuator po-
sition switch 1
(Low)

• Vehicle stopped
• Engine running
• A/T selector lever N posi-

tion

• Brake pedal depressed

4WD shift switch: 4LO

ON

4WD shift switch: 2WD, 
AUTO or 4H

OFF

SHIFT POS SW2 [ON/
OFF]

Condition of actuator po-
sition switch 2
(High)

• Vehicle stopped
• Engine running
• A/T selector lever N posi-

tion

• Brake pedal depressed

4WD shift switch: 4H, 
AUTO or 2WD

ON

4WD shift switch: 4LO

OFF

SHIFT ACT 1 [ON/OFF]

Output condition to actu-
ator motor (High)

• Vehicle stopped
• Engine running
• A/T selector lever N posi-

tion

• Brake pedal depressed

4WD shift switch: 4H to 
4LO (Wait function is op-
erating.)

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 posi-

tion

• Brake pedal depressed

4WD shift switch: 4H to 
4LO (Wait function is op-
erating.)

ON

Except the above

OFF

SHIFT ACT 2 [ON/OFF]

Output condition to actu-
ator motor (Low)

• Vehicle stopped
• Engine running
• A/T selector lever N posi-

tion

• Brake pedal depressed

4WD shift switch: 4LO to 
4H (Wait function is oper-
ating.)

ON

Except the above

OFF

Monitored item [Unit]

Content

Condition

Display value

TRANSFER CONTROL UNIT

DLN-85

< ECU DIAGNOSIS >

[ATX14B]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

PHYSICAL VALUES

Terminal Layout

SHIFT AC MON2 [ON/
OFF]

Check signal for transfer 
control unit signal output

• Vehicle stopped
• Engine running
• A/T selector lever N posi-

tion

• Brake pedal depressed

4WD shift switch: 4LO to 
4H (Wait function is oper-
ating.)

ON

Except the above

OFF

T/F F SPEED [km/h] or 
[mph]

Displayed, but do not use.

AT R SPEED [km/h] or 
[mph]

Condition of vehicle 
speed sensor A/T (output 
speed sensor)

During driving

Approximately 
matches the out-
put shaft speed.

AT GEAR POSI [1/2/3/4/
5]

Condition of A/T selector 
lever position

Displays actual A/T gear position.

1
2
3
4
5

Monitored item [Unit]

Content

Condition

Display value

WDIA0378E

Terminal

Wire 

color

Item

Condition

Data (Approx.)

1

GR

2-4WD shift solenoid valve

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

“N” position

• Brake pedal de-

pressed

4WD shift switch: 2WD

0V

4WD shift switch: AUTO, 4H or 4LO

Battery voltage

2

 

B/W

4WD shift indicator lamp 
(2WD indicator lamp)

2WD indicator lamp: OFF

Battery voltage

2WD indicator lamp: ON

0V

3

B

Ground

Always

0V

4

Y/L

Transfer shift high relay

• 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

5

W/B

4WD warning lamp

4WD warning lamp: ON

0V

4WD warning lamp: OFF

Battery voltage

6

B

Ground

Always

0V

7

L

CAN-H

—

—

8

P

CAN-L

—

—

9

G/W

4WD shift switch
(2WD)

Ignition switch: ON

4WD shift switch: 2WD

Battery voltage

4WD shift switch: AUTO, 4H or 4LO

0V

DLN-86

< ECU DIAGNOSIS >

[ATX14B]

TRANSFER CONTROL UNIT

10

L/W

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

L

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

W/G

4LO indicator lamp

4LO indicator lamp: OFF

Battery voltage

4LO indicator lamp: ON

0V

13

G/B

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

LG

 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

L/B

ATP warning lamp

ATP indicator lamp: ON

 0V

ATP indicator lamp: OFF

Battery voltage

16

Y/R

Power supply

Ignition switch: ON

Battery voltage

Ignition switch: 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

L

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

BR

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

Y/R

Power supply

Ignition switch: ON

Battery voltage

Ignition switch: OFF

 0V

23

R

4WD shift switch
(4LO)

Ignition switch: ON

4WD shift switch: 4LO

Battery voltage

4WD shift switch: 2WD, AUTO or 4H

 0V

24

LG/R

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.)