Infiniti QX4 (R50). Manual — part 587
3
CHECK PROCEDURES FROM THE BEGINNING
Check again.
OK or NG
OK
©
INSPECTION END
NG
©
Recheck each connector’s pin terminals for damage or loose connection.
TROUBLE DIAGNOSES FOR SYMPTOMS
Symptom 9. 4WD System Does Not Operate (Cont’d)
TF-110
NBTF0038
SMT858D
4WD Shift Switch
NBTF0038S01
Check continuity between each terminal.
Terminals
Switch position
Continuity
1 - 2
2WD
Yes
Except 2WD
No
1 - 3, 1 - 4
AUTO
Yes
Except AUTO
No
1 - 4, 1 - 5
4H
Yes
Except 4H
No
1 - 4, 1 - 6
4LO
Yes
Except 4LO
No
SMT079D
2-4WD Shift Solenoid Valve and Transfer Fluid
Temperature Sensor
NBTF0038S02
Measure resistance between terminals of transfer terminal cord
assembly sub-harness connector located on rear-right of transfer
unit.
Component parts
Terminals
Resistance
2-4WD shift solenoid valve
4 - 5
Approx. 20°C (68°F):
Approx. 22.8 - 25.2
Ω
Transfer fluid temperature
sensor
2 - 3
Approx. 20°C (68°F): Approx. 2.5 k
Ω
Approx. 80°C (176°F): Approx. 0.3
k
Ω
SMT080D
4WD Solenoid Valve, Clutch Pressure Switch
and Line Pressure Switch
NBTF0038S03
Measure resistance between terminals of transfer terminal cord
assembly sub-harness connector located on rear-right of transfer
unit.
GI
MA
EM
LC
EC
FE
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
COMPONENT INSPECTION
4WD Shift Switch
TF-111
Component
parts
Terminals
Remarks
4WD solenoid
valve
6
Ground
terminal
Approx. 20°C (68°F): Approx. 3.0 - 3.4
Ω
Clutch pres-
sure switch
7
In room temperature
I
2-4WD shift solenoid valve “OFF”: No
continuity
I
2-4WD shift solenoid valve and transfer
motor “ON”: Continuity exists
Line pressure
switch
1
In room temperature
I
Turn ignition switch to “OFF” position
and leave vehicle for more than 5 min-
utes. (OFF): No continuity
I
Transfer motor “ON”: Continuity exists
SMT081D
Front Revolution Sensor
NBTF0038S04
Measure resistance between terminals of front revolution sensor
sub-harness connector located on rear-right of transfer unit.
Terminals
Resistance
16 - 17
500 - 650
Ω
18 - 17
No continuity
18 - 16
No continuity
SMT806D
Transfer Dropping Resistor
NBTF0038S07
Check resistance between terminals.
Resistance: 11.2 - 12.8
Ω
SMT083D
ATP Switch, Neutral-4LO Switch and Wait
Detection Switch
NBTF0038S06
Measure resistance between terminals of transfer switch assembly
sub-harness connector located on rear-right of transfer unit.
COMPONENT INSPECTION
4WD Solenoid Valve, Clutch Pressure Switch and Line Pressure Switch (Cont’d)
TF-112
Switch
Terminals
4WD shift switch position
4H
(N)
4LO
ATP switch
8 - 9
No conti-
nuity
Continuity
No conti-
nuity
Neutral-4LO
switch
12 - 13
No continuity
Continuity
Wait detection
switch
10 - 11
No continuity
Continuity
(Note)
+
- - - - - - - - - - - - - - - - - - - - - - - - - - -
NOTE:
When shifting from “4LO” to “4H”, continuity exists while “Wait” function is operat-
ing. (No continuity exists when “Wait” function is canceled.)
SMT082D
Transfer Motor
NBTF0038S05
Apply battery voltage directly to transfer motor assembly sub-har-
ness connector located on rear-right of transfer unit. (Positive: Ter-
minal 14, Negative: Terminal 15)
Transfer motor should operate.
SMT085D
Transfer Motor Relay
NBTF0038S08
1.
Apply battery voltage directly to terminals 3 and 4.
2.
Check continuity between terminals 1 and 2.
Condition
Continuity (1 - 2)
Battery voltage is applied
Yes
No voltage is applied
No
SMT086DB
Transfer Sub-harness
NBTF0038S09
FRONT REVOLUTION SENSOR SUB-HARNESS
CONNECTOR
NBTF0038S0901
Check continuity between terminals shown in the figure.
GI
MA
EM
LC
EC
FE
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
COMPONENT INSPECTION
ATP Switch, Neutral-4LO Switch and Wait Detection Switch (Cont’d)
TF-113
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