brake fluid INFINITI QX56 2006 Factory Service Manual

PARKING BRAKE SHOEPB-7
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Revision: November 2009 2006 QX56
INSPECTION AFTER REMOVAL
Lining Thickness Inspection

Check thickness of lining.
Drum Inner Diameter Inspection

Check drum inner diameter.
Other Inspections

Check shoe sliding surface for excessive wear and damage.

Check anti-rattle pins for excessive wear and corrosion.

Check return springs for sagging.

Check adjuster for rough operation.

When disassembling adjuster, apply PBC (Poly Butyl Cuprysil) grease or equivalent to the adjuster
threads. Refer to MA-11, "
RECOMMENDED FLUIDS AND LUBRICANTS" .

Check either visually or with a vernier caliper to see if there is any excessive wear, cracks, or damage
inside drum.
INSTALLATION
Installation is in the reverse order of removal.

Apply brake grease to the specified points during assembly. Refer to PB-4, "Components" .

Install adjuster so that threaded part expands when rotating it in
the direction shown by the arrow.

Shorten adjuster by rotating it in the oposite direction as shown
by the arrow.
NOTE:
After replacing brake shoes or disc rotors, or if parking brake does
not function well, perform break-in operation as follows.
1. Adjust parking brake pedal stroke. Refer to PB-3, "
ADJUST-
MENT" .
2. Perform parking brake burnishing operation by driving the vehicle forward under the following conditions: Standard thickness "A" : 5.15
± 0.25 mm
(0.203 ± 0.010 in)
Wear limit thickness "A" : 0.5 mm (0.020 in)
SBR021A
Standard inner diameter : 205 ± 0.13 mm
(8.07 ± 0.01 in)
Wear limit of inner diameter : 205.7 mm (8.10 in)
SBR768A
SFIA0153E

Vehicle speed 40 km/h (25 mph) set (forward)

Parking brake operating force 196 N (20.0 kg-f, 44.1 lb-f) set

Apply time 30 sec.

NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTINGPS-5
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Revision: November 2009 2006 QX56
NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTINGPFP:00003
NVH Troubleshooting ChartEGS000U8
Use chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.
×: ApplicableReference page
PS-6PS-6PS-18PS-18PS-18PS-6PS-7PS-7
EM-13, "
Checking Drive Belts
"
PS-7PS-13PS-15PS-11PS-10PS-15

PR-3, "
NVH Troubleshooting Chart
"
FFD-6, "
NVH Troubleshooting Chart
"
FAX-4, "
NVH Troubleshooting Chart
"
FSU-4, "
NVH Troubleshooting Chart
"
WT-4, "
NVH Troubleshooting Chart
"
WT-4, "
NVH Troubleshooting Chart
"
FAX-4, "
NVH Troubleshooting Chart
"
BR-5, "
NVH Troubleshooting Chart
"
Possible cause and sus-
pected parts
Fluid level
Air in hydraulic system
Outer socket ball joint swinging force
Outer socket ball joint rotating torque
Outer socket ball joint end play
Steering fluid leakage
Steering wheel play
Steering gear rack sliding force
Drive belt looseness
Improper steering wheel
Improper installation or looseness of tilt lock lever
Mounting rubber deterioration
Steering column deformation or damage
Improper installation or looseness of steering column
Steering linkage looseness
PROPELLER SHAFT
FRONT FINAL DRIVE
WHEEL HUB
SUSPENSION
TIRES
ROAD WHEEL
DRIVE SHAFT
BRAKES
Symptom Noise
× × ××××× × × ××××××× ×
Shake ×××× ××××× ×
Vibration ××××× × ××× ×
Shimmy ××× × ×××× ×
Shudder × × ×××× ×

STEERING WHEELPS-7
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Revision: November 2009 2006 QX56
STEERING WHEELPFP:48430
On-Vehicle Inspection and ServiceEGS000UC
CHECKING CONDITION OF INSTALLATION

Check installation condition of steering gear assembly, front suspension, axle and steering column.

Check if movement exists when steering wheel is moved up and down, to the left and right and to the axial
direction.

Check if the mounting nuts for steering gear assembly are loose.
Refer to PS-15, "
POWER STEERING GEAR AND LINKAGE" .
CHECKING STEERING WHEEL PLAY
1. Turn tires straight ahead, start engine, then turn steering wheel to the left and right lightly, and measure
steering wheel movement on the outer circumference when steering wheel is turned up to the point where
tires start moving.
CHECKING NEUTRAL POSITION ON STEERING WHEEL

Check neutral position on steering wheel after confirming that front wheel alignment is correct. Refer to
FSU-6, "
Front Wheel Alignment" .
1. Turn tires straight ahead, check if steering wheel is in the neutral position.
2. If it is not in the neutral position, remove steering wheel and reinstall it correctly.
3. If the neutral position cannot be attained by repositioning the steering wheel two teeth or less on steering stem, loosen tie-rod lock nuts of steering outer sockets, then adjust tie-rods by the same amount in the
opposite direction.
CHECKING STEERING WHEEL TURNING FORCE
1. Park vehicle on a level, dry surface and set parking brake.
2. Start engine.
3. Bring power steering fluid up to operating temperature of 60 ° – 80° C (140 ° – 176° F).
4. Tires need to be inflated to specified pressure. Refer to WT-38, "
Tire" .
5. Check steering wheel turning force using Tool when steering wheel has been turned 360 ° from the neutral position.
6. If steering wheel turning force is out of specification, inspect the following:

Steering column. Refer to PS-11, "INSPECTION AFTER
REMOVAL" .

Power steering oil pump. Refer to PS-21, "CHECKING
RELIEF OIL PRESSURE" .
7. If steering column and power steering oil pump meet specifications, replace steering gear. Refer to PS-15,
"Removal and Installation" .
End play of the axial direction for steering wheel : 0 mm (0 in)
LGIA0024E
Steering wheel play on the outer circumference : 0
− 35 mm (0 − 1.38 in)
Tool number : J-44372
Steering wheel
turning force : 39 N (4 kg-f, 9 lb-f) or less
WGIA0035E

TF-18
ALL-MODE 4WD SYSTEM
Revision: November 20092006 QX56
4WD mode. Setting the vehicle in the 2WD mode requires no pressure buildup. In other words, pressure force
applied to the wet-multiplate clutch becomes zero.
CLUTCH PRESSURE SOLENOID VALVE
The clutch pressure solenoid valve distributes torque (front and rear) in AUTO mode.
LINE PRESSURE SWITCH

With the transfer system design, control of the oil pressure provides the transmission of drive torque to the
front wheels. The main pressure to control the oil pressure is referred to as the line pressure.

The line pressure switch determines whether or not adequate line pressure has built up under different
operating conditions.

The line pressure switch turns ON when line pressure is produced.

The line pressure switch senses line pressure abnormalities and turns the 4WD warning lamp ON.
CLUTCH PRESSURE SWITCH

The clutch pressure switch determines whether or not adequate clutch pressure has built up under differ-
ent operating conditions.

The clutch pressure switch turns ON when clutch pressure is produced.

The clutch pressure switch senses clutch pressure abnormalities and turns the 4WD warning lamp ON.
TRANSFER FLUID TEMPERATURE SENSOR
The transfer temperature sensor detects the transfer fluid temperature and sends a signal to the transfer con-
trol unit.
TRANSFER CONTROL UNIT

Transfer control unit controls transfer control device by input signals of each sensor and each switch.

Self-diagnosis can be done.
TRANSFER CONTROL DEVICE
The transfer control device changes the state of transfer assembly between 2WD, AUTO, 4H⇔4LO with the
2WD, AUTO, 4H and 4LO signals of 4WD shift switch.
NOTE:

To shift between 4H ⇔4LO, stop the vehicle, depress the brake pedal and shift the transmission selector
to the "N" position. Depress and turn the 4WD shift switch. The shift switch will not shift to the desired
mode if the transmission is not in "N" or the vehicle is moving. The 4LO indicator lamp will be lit when the
4LO is engaged.

Actuator motor and actuator position switch are integrated.
4WD SHIFT SWITCH AND INDICATOR LAMP
4WD Shift Switch
The 4WD shift switch allows selection from 2WD, AUTO, 4H or 4LO.
4WD Shift Indicator Lamp

Displays driving conditions selected by 4WD shift switch with 2WD, AUTO and 4H indicators while engine
is running. (When 4WD warning lamp is turned on, all 4WD shift indicator lamps are turned off.)

Turns ON for approximately 1 second when ignition switch is turned ON, for purpose of lamp check.
4LO Indicator Lamp

Displays 4LO condition while engine is running. 4LO indicator lamp flashes if transfer gear does not shift
completely under 2WD, AUTO, 4H ⇔4LO. (When 4WD warning lamp is turned on, 4LO indicator lamp is
turned off.)

Turns ON for approximately 1 second when ignition switch is turned ON, for purpose of lamp check.

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" .
PREPARATION FOR ROAD TEST

The purpose of the test is to determine overall performance of
transfer and analyze causes of problems.

When a malfunction is found in any part of transfer, perform the
road test to locate the malfunction area and repair the malfunc-
tion parts.

The road test consists of the following three parts.
–Check before engine is started. Refer to TF-32, "CHECK
BEFORE ENGINE IS STARTED" .
–Check at idle. Refer to TF-32, "CHECK AT IDLE" .
–Cruise test. Refer to TF-33, "CRUISE TEST" .
CHECK BEFORE ENGINE IS STARTED
1. CHECK 4WD SHIFT INDICATOR LAMP
1. Park vehicle on flat surface.
2. Turn ignition switch to “OFF ” position.
3. Move A/T selector lever to “P ” position.
4. Set 4WD shift switch to “2WD” position.
5. Turn ignition switch to “ON ” position. (Do not start engine.)
Does 4WD shift indicator lamp turn ON for approximately 1 second?
YES >> GO TO 2.
NO >> Go to TF-117, "
4WD Shift Indicator Lamp and 4LO Indicator Lamp Do Not Turn ON" .
2. CHECK 4WD WARNING LAMP
1. Turn ignition switch to “OFF ” position.
2. Move A/T selector lever to “P ” position.
3. Set 4WD shift switch to “2WD” position.
4. Turn ignition switch to “ON ” position. (Do not start engine.)
Does 4WD warning lamp turn ON?
YES >> GO TO TF-32, "CHECK AT IDLE" .
NO >> GO TO TF-121, "
4WD Warning Lamp Does Not Turn ON" .
CHECK AT IDLE
1. CHECK 4WD SHIFT INDICATOR LAMP
1. Park vehicle on flat surface and engage the parking brake.
2. Turn ignition switch to “OFF ” position.
3. Move A/T selector lever to “P ” position.
4. Set 4WD shift switch to “2WD” position.
5. Start engine.
Does 4WD shift indicator lamp turn ON?
YES >> GO TO 3.
NO >> GO TO 2.
SMT089D

TF-42
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
30 SB Shut off relayIgnition switch: ON
0V
Ignition switch: OFF Battery voltage
31 G Transfer fluid temperature
sensor Ignition switch: ONTransfer 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
depressed 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 ”
function is not operating.) 0V

Vehicle stopped

Engine running4WD 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”
position.

Ignition switch: ON

A/T selector lever: “P ” or "N" position

4WD shift switch: other than AUTO Battery voltage
40 L 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.)
0V
Except the above Battery voltage
41 R Transfer motor relay moni-
tor

Accelerator pedal
depressed

Vehicle stopped

Engine running

Brake pedal
depressed 4WD shift switch: 2WD 0V
4WD shift switch: AUTO or 4LO (A/T
selector 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
selector lever “P ” position) Battery voltage
Te r m i n a l
Wire
color Item
ConditionData (Approx.)