Infiniti QX56 (JA60). Manual - part 291

TRANSFER CONTROL UNIT

DLN-87

< ECU DIAGNOSIS >

[ATX14B]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

25

V

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/L

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

B/G

Sensor ground

Always

0V

29

L/W

Ignition switch monitor

Ignition switch: ON

Battery voltage

Ignition switch: OFF

0V

30

SB

Shut off relay

Ignition switch: ON

0V

Ignition switch: 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

R/L

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

BR/

W

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

L/Y

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.)

DLN-88

< ECU DIAGNOSIS >

[ATX14B]

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.

41

R

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

P/G

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

G/Y

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/B

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

W

Power supply
(Memory back-up)

Ignition switch: ON

Battery voltage

Ignition switch: OFF

Battery voltage

Terminal

Wire 

color

Item

Condition

Data (Approx.)

TRANSFER CONTROL UNIT

DLN-89

< ECU DIAGNOSIS >

[ATX14B]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

Wiring Diagram - ALL-MODE 4WD SYSTEM -

INFOID:0000000005148854

ABDWA0015GB

DLN-90

< ECU DIAGNOSIS >

[ATX14B]

TRANSFER CONTROL UNIT

ABDWA0114GB