2006 INFINITI QX56 Factory Service Manual

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Page 3137 of 3383

INFINITI QX56 2006 Factory Service Manual TF-32
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
Inspections Before Trouble DiagnosisEDS002HH
TRANSFER FLUID CHECK
Check fluid for leaks and fluid level. Refer to TF-11, "Inspection" .
PREPAR

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INFINITI QX56 2006 Factory Service Manual TROUBLE DIAGNOSISTF-33
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Revision: November 2009 2006 QX56
2. CHECK 4WD WARNING LAMP
Check 4WD warning lamp state?
Is 4WD warning lamp turned ON?
YES >> Perform the self-diagn

Page 3139 of 3383

INFINITI QX56 2006 Factory Service Manual TF-34
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
2. CHECK TIGHT CORNER BRAKING SYMPTOM (1)
1. Set 4WD shift switch to “AUTO” position.
2. Drive vehicle at speed lower than 20 km/h (12 MPH

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INFINITI QX56 2006 Factory Service Manual TROUBLE DIAGNOSISTF-35
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NOTE:
Light tight-corner braking symptom may occur depending on driving conditions in AUTO mode. This is not
a malf

TROUBLE DIAGNOSISTF-35
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Revision: November 2009 2006 QX56
NOTE:
Light tight-corner braking symptom may occur depending on driving conditions in AUTO mode. This is not
a malfunction.
Heavy tight-corner braking symptom occurs when vehicle is driven in the following conditions: 4WD shift
switch is "4H" or "4LO", steering wheel is turned fully to either side.
Transfer Control Unit Input/Output Signal Reference ValuesEDS002HJ
TRANSFER CONTROL UNIT INSPECTION TABLE
Specifications with CONSULT-II
4WD warning lamp flashes slowly
(1 time/2 seconds)While drivingTire size is different between front and
rear of vehicle.
TF-129
Transfer fluid temperature
Clutch pressure switch
Heavy tight-corner braking symptom occurs
(See NOTE.)
While driving
AUTO mode
Steering wheel is
turned fully to either
side CAN communication line
TF-130
4WD shift switch
Accelerator pedal position signal
Clutch pressure solenoid
Transfer inner parts
4WD system does not operate While driving 4WD shift switch
TF-131
Clutch pressure switch
Transfer inner parts
Symptom
ConditionCheck itemReference page
Monitored item [Unit] Content ConditionDisplay value
VHCL/S SEN ·FR [km/h]
or [mph] Front wheel speed Vehicle stopped
0 km/h (0 MPH)
Vehicle running
CAUTION:
Check air pressure of tire under standard condition. Approximately
equal to the indi-
cation on speed-
ometer (Inside of
±
10%)
VHCL/S SEN ·RR [km/h]
or [mph] Rear wheel speed Vehicle stopped
0 km/h (0 MPH)
Vehicle running
CAUTION:
Check air pressure of tire under standard condition. Approximately
equal to the indi-
cation on speed-
ometer (Inside of
±
10%)
ENGINE SPEED [rpm] Engine speed Engine stopped
(Engine speed: Less than 400 rpm)
0 rpm
Engine running
(Engine speed: 400 rpm or more) Approximately
equal to the indi-
cation on tachom-
eter
THRTL POS SEN [V] Accelerator pedal posi-
tion (APP) sensor signal
voltage Accelerator pedal: Release
Approx. 0.5V
Accelerator pedal: Fully depressed Approx. 4.0V
FLUID TEMP SE [V] Transfer fluid tempera-
ture signal voltage Transfer fluid temperature approx. 20 - 80°C (68 - 176
°F) Approx. 1.1 - 0.3V
BATTERY VOLT [V] Power supply voltage for
transfer control unit
Ignition switch: ON
Battery voltage
2WD SWITCH [ON/OFF] Input condition from
4WD shift switch 4WD shift switch: 2WD
ON
4WD shift switch: AUTO, 4H or 4LO OFF
AUTO SWITCH [ON/
OFF] Input condition from
4WD shift switch 4WD shift switch: AUTO
ON
4WD shift switch: 2WD, 4H or 4LO OFF

Page 3141 of 3383

INFINITI QX56 2006 Factory Service Manual TF-36
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
LOCK SWITCH [ON/
OFF]Input condition from
4WD shift switch 4WD shift switch: 4H
ON
4WD shift switch: 2WD, AUTO or 4LO OFF
4L SWITCH [ON/OFF] I

TF-36
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
LOCK SWITCH [ON/
OFF]Input condition from
4WD shift switch 4WD shift switch: 4H
ON
4WD shift switch: 2WD, AUTO or 4LO OFF
4L SWITCH [ON/OFF] Input condition from
4WD shift switch 4WD shift switch: 4LO
ON
4WD shift switch: 2WD, AUTO or 4H OFF
N POSI SW TF [ON/
OFF] Condition of neutral-4LO
switch
Vehicle stopped
Engine running
A/T selector lever
“N ” posi-
tion
Brake pedal depressed 4WD shift switch: 2WD,
AUTO or 4H
OFF
4WD shift switch: 4H to
4LO (While actuator
motor is operating.) OFF
→ ON
4WD shift switch: 4LO to
4H (While actuator motor
is operating.) ON
→ OFF
4WD shift switch: 4LO ON
ATP SWITCH [ON/OFF] Condition of ATP switch
Vehicle stopped
Engine running
A/T selector lever “N ”
Brake pedal depressed 4WD shift switch
: 4H to 4LO or 4LO to 4H
(While actuator motor is
operating.)
ON
Except the above OFF
WAIT DETCT SW [ON/
OFF] Condition of wait detec-
tion switch
Vehicle stopped
Engine running
A/T selector lever
“N ” posi-
tion
Brake pedal depressed 4WD shift switch: 2WD,
AUTO or 4H
OFF
4WD shift switch: 4H to
4LO (While actuator
motor is operating.) OFF
→ ON
4WD shift switch: 4LO to
4H (While actuator motor
is operating.) ON
→ OFF
4WD shift switch: 4LO ON
LINE PRES SW [ON/
OFF] Condition of line pres-
sure switch
A/T selector lever
“D ” position
4WD shift switch: 2WD, AUTO or 4H ON
Except the above
The vehicle has been left
at room temperature for 5
minutes and more with
ignition switch in “
OFF”
position.Ignition switch: ON
A/T selector lever: “P ”
or "N" position
4WD shift switch: other
than AUTO OFF
CL PRES SW [ON /
OFF] Condition of clutch pres-
sure switch
Vehicle stopped
Engine running
A/T selector lever
“D ” position
4WD shift switch: AUTO or 4H (“ Wait” function is not
operating.) ON
Vehicle stopped
Engine running
4WD shift switch: 2WD (
“Wait ” function is not operat-
ing.) OFF
N POSI SW AT [ON/
OFF] Input condition from A/T
PNP switch
Vehicle stopped
Engine running
Brake pedal depressed A/T selector lever posi-
tion: N
ON
Except the above OFF
R POSI SW AT [ON/
OFF] Input condition from A/T
PNP switch
Vehicle stopped
Engine running
Brake pedal depressed A/T selector lever posi-
tion: R
ON
Except the above OFF
Monitored item [Unit]
Content ConditionDisplay value

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INFINITI QX56 2006 Factory Service Manual TROUBLE DIAGNOSISTF-37
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P POSI SW AT [ON/
OFF]Input condition from A/T
PNP switchVehicle stopped
Engine running
Brake pedal depressed A/T

TROUBLE DIAGNOSISTF-37
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P POSI SW AT [ON/
OFF]Input condition from A/T
PNP switchVehicle stopped
Engine running
Brake pedal depressed A/T selector lever posi-
tion: P
ON
Except the above OFF
ABS OPER SW [ON/
OFF] Condition of ABS operat-
ing ABS is operating.
ON
ABS is not operating. OFF
VDC OPER SW [ON/
OFF] Condition of VDC operat-
ing VDC is operating.
ON
VDC is not operating. OFF
TCS OPER SW [ON/
OFF] Condition of TCS operat-
ing TCS is operating.
ON
TCS is not operating. OFF
THROTTLE POSI [0.0/8] Condition of throttle
opening When depressing accelerator pedal
(Value rises gradually in response to throttle position.)
0.0/8 - 8.0/8
4WD MODE [AUTO/
LOCK/2WD/4L] Control status of 4WD
(Output condition of
4WD shift indicator lamp
and 4LO indicator lamp)
Vehicle stopped
Engine running
A/T selector lever “
N” posi-
tion
Brake pedal depressed 4WD shift switch: 2WD
2WD
4WD shift switch: AUTO AUTO
4WD shift switch: 4H LOCK
4WD shift switch: 4LO 4L
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 indi-
cation on speed-
ometer (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
Monitored item [Unit]
Content ConditionDisplay value

Page 3143 of 3383

INFINITI QX56 2006 Factory Service Manual TF-38
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
2-4WD SOL MON [ON/
OFF]Check signal for transfer
control unit signal output
Vehicle stopped
Engine running
A/T selector lever
“N ” pos

TF-38
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
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
motor relay
Accelerator pedal
depressed
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
selector lever “P ” or “ N”
position) ON
4WD shift switch: 4H (A/T
selector lever “P ” posi-
tion) OFF
("ON" for approx. 2 sec. after shifting to “P”.)
4WD shift switch: 4H
(Except for A/T selector
lever “P ” position) ON
MOTOR RELAY MON
[ON/OFF] Check signal for transfer
control unit signal output
Accelerator pedal
depressed
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
selector lever “P ” or “ N”
position) ON
4WD shift switch: 4H (A/T
selector lever “P ” posi-
tion) OFF
("ON" for approx. 2
sec. after shifting to “P”.)
4WD shift switch: 4H
(Except 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
indicator lamp (2WD
indicator 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
indicator lamp (AUTO
indicator 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
indicator 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
Monitored item [Unit]
Content ConditionDisplay value

Page 3144 of 3383

INFINITI QX56 2006 Factory Service Manual TROUBLE DIAGNOSISTF-39
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Revision: November 2009 2006 QX56
Specifications Between Transfer Control Unit Terminals
TRANSFER CONTROL UNIT TERMINAL CONNECTOR LAYOUT
ATP IND [ON/OF

TROUBLE DIAGNOSISTF-39
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Revision: November 2009 2006 QX56
Specifications Between Transfer Control Unit Terminals
TRANSFER CONTROL UNIT TERMINAL CONNECTOR LAYOUT
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
position 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
position 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 ACT1 [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
operating.) 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
operating.) ON
Except the above OFF
SHIFT ACT2 [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
operating.) ON
Except the above OFF
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
operating.) ON
Except the above OFF
T/F F SPEED [km/h] or
[mph] Displayed, but do not use.
A/T R SPEED [km/h] or
[mph] Condition of vehicle
speed sensor A/T (Revo-
lution sensor)
During driving Approximately
matches the out-
put shaft speed.
AT GEAR POSI [1/2/3/4/
5] Condition of A/T selec-
tor lever position
Displays actual A/T gear position.
1/2/3/4/5
Monitored item [Unit]
Content ConditionDisplay value
WDIA0204E

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