Infiniti QX4 (R50). Manual — part 573
SMT862D
Transfer Control Unit Terminals and Reference
Value
NBTF0018
REMOVAL AND INSTALLATION OF TRANSFER
CONTROL UNIT
NBTF0018S03
Removal
NBTF0018S0301
1.
Turn ignition switch OFF and disconnect negative battery ter-
minal.
2.
Remove console box.
3.
Remove cluster lid C.
4.
Remove audio assembly and A/C control unit.
5.
Remove instrument lower panel on driver side.
6.
Remove glove box.
7.
Remove instrument lower panel on passenger side.
8.
Remove instrument lower center panel.
9.
Remove transfer control unit.
I
For steps 2 through 8 above, refer to BT-21, “Instrument Panel
Assembly”.
Installation
NBTF0018S0302
I
Installation is in the reverse order of removal.
When installing transfer control unit, tighten transfer control unit
lock nut.
Tightening torque:
: 4.3 - 5.8 N·m (0.44 - 0.59 kg-m, 38 - 51 in-lb)
SMT771D
INSPECTION OF TRANSFER CONTROL UNIT
NBTF0018S01
I
Measure voltage between each terminal and terminal 6 or 45
by following “TRANSFER CONTROL UNIT INSPECTION
TABLE”, TF-55.
I
Pin connector terminal layout
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Transfer Control Unit Terminals and Reference Value
TF-54
SMT772D
TRANSFER CONTROL UNIT INSPECTION TABLE
NBTF0018S02
(Data are reference values.)
Terminal
No.
Item
Condition
Judgement standard
1
2-4WD shift solenoid
valve
&
4WD shift switch is set to “2WD”
position.
Less than 1V
4WD shift switch is set to any posi-
tion other than “2WD”.
Battery voltage
2
4WD shift indicator lamp
(2WD)
Lamp lights while system is operating
properly.
Less than 1V
&
2WD indicator lamp does not come
on.
Battery voltage
3
Ground
—
—
4
Transfer shift relay
(High)
While actuator is operating
(4H
,
4LO)
Battery voltage
Actuator does not operate.
Less than 1V
5
4WD warning lamp
Lamp comes ON. (when engine is
stopped.)
(Fail-safe condition appears on
display, engine is stopped, actuator
position detection switch is
inoperative, oil temperature is too
high and/or tires of different size are
installed.)
Less than 1V
Except above
Battery voltage
6
Ground
—
—
—
7
PNP switch (R position)
&
A/T selector lever is set to “reverse”
position.
Battery voltage
A/T selector lever is set to any posi-
tion other than “reverse”.
Less than 1V
8
—
—
—
—
GI
MA
EM
LC
EC
FE
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Transfer Control Unit Terminals and Reference Value (Cont’d)
TF-55
Terminal
No.
Item
Condition
Judgement standard
9
4WD shift switch (2WD)
&
4WD shift switch is set to “2WD”
position.
Battery voltage
4WD shift switch is set to any posi-
tion other than “2WD”.
Less than 1V
10
Transfer dropping resis-
tor
4WD shift switch is set to “AUTO”
position.
Approx. 4 - 14V
4WD shift switch is set to any posi-
tion other than “2WD”.
Less than 1V
11
4WD shift indicator lamp
(4H)
“4H” indicator lamp comes ON.
Less than 1V
4WD shift switch is set to any posi-
tion other than “4H”.
Battery voltage
12
4WD shift indicator lamp
(4LO)
“4LO” indicator lamp comes ON.
Approx. 0V
4WD shift switch is set to any posi-
tion other than “4LO”.
Battery voltage
13
Transfer shift relay (Low)
&
While actuator is operating
(4LO
,
4H)
Battery voltage
Actuator does not operate.
Approx. 0V
14
Transfer motor relay
Transfer motor relay is ON.
Battery voltage
Transfer motor relay is OFF.
Less than 1V
15
PNP switch (N position)
A/T selector lever is set to “N” posi-
tion.
Battery voltage
A/T selector lever is set to any posi-
tion other than “N” position.
Less than 1V
16
Power supply
—
Ignition key is set to “ON” position.
Battery voltage
Ignition key is set to “OFF” position.
Approx. 0V
17
PNP switch (P position)
&
A/T selector lever is set to “P” posi-
tion.
Battery voltage
A/T selector lever is set to any posi-
tion other than “P”.
Less than 1V
18
4WD shift switch (4H)
4WD shift switch is set to “4H” posi-
tion.
Battery voltage
4WD shift switch is set to any posi-
tion other than “4H”.
Less than 1V
19
4WD solenoid valve
4WD shift switch is set to “AUTO”
position.
Approx. 1.5 - 3V
4WD shift switch is set to any posi-
tion other than “2WD”.
Less than 1V
20
—
—
—
—
21
4WD shift indicator lamp
(AUTO)
“AUTO” indicator lamp comes ON.
Approx. 0V
4WD shift switch is set to any posi-
tion other than “AUTO”.
Battery voltage
22
Power supply
—
Ignition key is set to “ON” position.
Battery voltage
Ignition key is set to “OFF” position.
Approx. 0V
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Transfer Control Unit Terminals and Reference Value (Cont’d)
TF-56
Terminal
No.
Item
Condition
Judgement standard
23
4WD shift switch (4LO)
&
4WD shift switch is set to “4LO” posi-
tion.
Battery voltage
4WD shift switch is set to any posi-
tion other than “4LO”.
Less than 1V
24
4WD shift switch (AUTO)
4WD shift switch is set to “AUTO”
position.
Battery voltage
4WD shift switch is set to any posi-
tion other than “AUTO”.
Less than 1V
25
Neutral-4LO switch
Transfer is set to “4LO” position.
Approx. 0V
Transfer is set to any position other
than “4LO”.
Power supply
26
Throttle position switch
(closed)
Throttle valve is closed.
Power supply
Throttle valve is in any position other
than “closed”.
Approx. 0V
27
Transfer 4H actuator
switch
4WD shift switch is set to “4H” posi-
tion.
Less than 1V
4WD shift switch is set to any posi-
tion other than “4H”.
Battery voltage
28
Throttle position sensor
(Ground)
Throttle valve is closed.
Less than 1V
Throttle valve is fully open.
29
TCM signal (Vehicle
speed signal)
When moving at 20 km/h (12 MPH),
use the CONSULT-II pulse frequency
measuring function.*1
CAUTION:
Connect the diagnosis data link
cable to the vehicle diagnosis con-
nector.
*1: A circuit tester cannot be used to
test this item.
Approximately 225 Hz
30
Throttle position sensor
(Power supply for throttle
position sensor)
Ignition key is set to “ON” position.
Approx. 4.5 - 5.5V
Ignition key is set to “OFF” position.
Approx. 0V
GI
MA
EM
LC
EC
FE
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Transfer Control Unit Terminals and Reference Value (Cont’d)
TF-57
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