brake sensor INFINITI QX56 2010 Factory Owners Manual

WHEEL HUBRAX-9
< REMOVAL AND INSTALLATION >
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7. Pull out the wheel hub and bearing assembly for access to remove the rear ABS sensor from the wheel hub and bearing
assembly as shown.
• Inspect the ABS sensor O-ri ng, replace the ABS sensor
assembly if damaged.
• Clean the ABS sensor hole and mounting surface with a suit-
able brake cleaner and a clean lint-free shop rag. Be careful
that dirt and debris do not enter the axle bearing area.
• Apply a coat of suitable grease to the ABS sensor O-ring and
mounting hole.
CAUTION:
Do not pull on the ABS harness.
8. Remove the wheel hub and bearing assembly.
INSTALLATION
Installation is in the reverse order of removal.
• Apply grease 44003 7S000 to contact surface between wheel hub and drive shaft. Use sufficient grease to completely coat contact
area.
• Inspect the ABS sensor O-ring, replace the ABS sensor assembly
if damaged.
• Clean the ABS sensor hole and mounting surface with a suitable brake cleaner and a clean lint-free shop rag. Be careful that dirt
and debris do not enter the axle bearing area.
• Apply a coat of suitable grease to the ABS sensor O-ring and mounting hole.
• Use a new cotter pin for installation.
• Use new wheel hub and bearing assembly bolts for installation.
LDIA0052E
WDIA0291E
Revision: April 20092010 QX56

RSU-12
< REMOVAL AND INSTALLATION >
REAR SUSPENSION MEMBER
Rear Load Leveling Air Suspension System
REMOVAL
1. Use the CONSULT-III “EXHAUST SOLENOID” active test to release the air pressure from the rear load
leveling air suspension system.
2. Disconnect the electrical connectors for the height sensor and the rear load leveling air suspension com-
pressor assembly.
3. Unclip the rubber cover to access the rear load leveling air suspension compressor assembly.
4. Disconnect the rear load leveling air suspension hoses at the rear load leveling air suspension compressor assembly.
• To disconnect the hoses, push in on the lock ring using a suit-able tool and pull the hose out.
5. Remove both of the rear wheel and tire assemblies using power tool.
6. Remove the brake caliper without disconnecting the brake hoses, using power tool. Reposition the brake caliper out of the
way using a suitable wire. Refer to BR-36, "
Removal and Instal-
lation of Brake Caliper and Disc Rotor" .
CAUTION:
13. Coil spring 14. Upper rubber seat15. Rear suspension member
16. Spare tire bracket 17. Bound bumper Front
AWEIA0054GB
1. Rear load leveling air suspension
hose, RH 2. Shock absorber, RH
3. Height sensor
4. Rear load leveling air suspension hose, LH 5. Shock absorber, LH
6. Rear load leveling air suspension
compressor assembly (includes the
bracket and rubber cover)
Front
LEIA0074E
Revision: April 20092010 QX56

REAR SUSPENSION MEMBERRSU-13
< REMOVAL AND INSTALLATION >
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• Do not crimp or stretch the brake hose when re positioning the brake caliper out of the way.
• Do not press brake pedal while the brake caliper is removed.
7. Remove the spare tire.
8. Disconnect the two rear ABS sensor electrical connectors.
9. Remove the two rear drive shafts. Refer to RAX-10, "
Removal and Installation" .
10. Remove the rear final drive. Refer to DLN-250, "
Removal and Installation" .
11. Remove the EVAP canister bolt from the top of the rear suspension member.
12. Disconnect the parking brake cables from the brackets on the rear suspension member.
13. Set a suitable jack to support each of the rear lower links and the coil spring tension.
14. Remove both of the rear lower link outer bolts and lower the jack to remove the rear coil springs.
15. Remove the two bolts to disconnect the seat belt latch anchor from the rear suspension member.
16. Disconnect both of the connecting rods from the rear stabilizer
bar.
17. Set a suitable jack under the rear suspension member.
18. Remove the six rear suspension member bolts.
19. Slowly lower the jack to remove the rear suspension member, suspension arm, front and rear lower links and stabilizer bar as
an assembly.
20. If necessary, remove the suspension arm, spare tire bracket, height sensor, rear load leveling air suspension hoses, stabilizer
bar, knuckle, and front and rear lower links from the rear suspension member.
INSPECTION AFTER REMOVAL
Check the rear suspension member for deformation, cracks, and other damage and replace if necessary.
INSTALLATION
Installation is in the reverse order of removal.
• When raising the rear suspension member assembly, use the
locating pins to align the rear suspension member to the vehicle
body.
LEIA0077E
LEIA0075E
LEIA0083E
Revision: April 20092010 QX56

SN
INSPECTION AND ADJUSTMENTSN-5
< BASIC INSPECTION >
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INSPECTION AND ADJUSTMENT
Preliminary CheckINFOID:0000000005146183
DESCRIPTION
The purpose of the sonar sensor preliminary check is to confirm that there are no outside factors affecting the
sonar system.
CONDITIONS
• Ignition switch ON
• No obstructions within 3.0 m (10 ft.) of sonar sensors
SONAR SENSOR STATUS CHECK
• Check that the sonar sensors are properly aligned (no deformation in sensor mounting areas).
• Check that snow, mud or other foreign obj ects are not adhering to the sonar sensors.
• Check that there is no deformation, scratc hes or other damage to the sonar sensors.
• Check that water has not accu mulated in the sonar sensors.
CAUTION:
Use water, cotton swab, or other soft material for cleaning the sensors.
1. Check that there are no obstacles wit hin each sonar sensor's detection range.
2. Check that there are no nearby ultrasound sources such as the sounds of vehicle horns, motorcycle
engines or truck air brakes.
3. Check that the vehicle is on a level surface.
Sonar sensors Detection range
Front Approx. 1.0 m (3 ft.) maximum
Rear Approx. 1.8 m (5.9 ft.) maximum
Revision: April 20092010 QX56

TM-1
TRANSMISSION & DRIVELINE
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CONTENTS
TRANSAXLE & TRANSMISSION
BASIC INSPECTION ....... .............................5
DIAGNOSIS AND REPAIR WORKFLOW ..... .....5
Work Flow ........................................................... ......5
Diagnostic Work Sheet ..............................................6
FUNCTION DIAGNOSIS ...............................8
A/T CONTROL SYSTEM ................................ .....8
Cross-Sectional View (2WD models) .................. ......8
Cross-Sectional View (4WD models) ........................9
Shift Mechanism ........................................................9
TCM Function ..........................................................20
CAN Communication ...............................................21
Input/Output Signal of TCM .....................................22
Line Pressure Control .............................................22
Shift Control ........................................................ ....24
Lock-up Control .......................................................25
Engine Brake Control ..............................................26
Control Valve ...........................................................26
Component Parts Location ......................................28
A/T SHIFT LOCK SYSTEM ............................ ....29
System Description ............................................. ....29
Component Parts Location ......................................29
ON BOARD DIAGNOSTIC (OBD) SYSTEM ......30
Introduction ......................................................... ....30
OBD-II Function for A/T System ..............................30
One or Two Trip Detection Logic of OBD-II ............30
OBD-II Diagnostic Trouble Code (DTC) ..................30
Malfunction Indicator Lamp (MIL) ............................31
DIAGNOSIS SYSTEM (TCM) .............................32
CONSULT-III Function (TRANSMISSION) ......... ....32
Diagnosis Procedure without CONSULT-III ........ ....37
COMPONENT DIAGNOSIS .........................40
U1000 CAN COMM CI RCUIT .............................40
Description .......................................................... ....40
On Board Diagnosis Logic ......................................40
Possible Cause .................................................... ....40
DTC Confirmation Procedure ..................................40
Diagnosis Procedure ...............................................40
P0615 STARTER RELAY .................................41
Description ...............................................................41
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ....
41
On Board Diagnosis Logic .......................................41
Possible Cause ........................................................41
DTC Confirmation Procedure ..................................41
Diagnosis Procedure ...............................................41
P0700 TRANSMISSION CONTROL .................44
Description ...............................................................44
On Board Diagnosis Logic .......................................44
Possible Cause ........................................................44
DTC Confirmation Procedure ..................................44
Diagnosis Procedure ...............................................44
P0705 TRANSMISSION RANGE SWITCH A ...45
Description ...............................................................45
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ....
45
On Board Diagnosis Logic .......................................45
Possible Cause ........................................................45
DTC Confirmation Procedure ..................................45
Diagnosis Procedure ...............................................45
P0717 INPUT SPEED SENSOR A ....................48
Description ...............................................................48
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ....
48
On Board Diagnosis Logic .......................................48
Possible Cause ........................................................48
DTC Confirmation Procedure ..................................48
Diagnosis Procedure ...............................................48
P0720 OUTPUT SPEED SENSOR ...................50
Description ...............................................................50
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ....
50
Revision: April 20092010 QX56

TM-4
STALL TEST ....................................................155
Inspection and Judgment .................................... ..155
LINE PRESSURE TEST ..................................157
Inspection and Judgment .................................... ..157
ROAD TEST .....................................................159
Description ........................................................... ..159
Check Before Engine Is Started ............................159
Check At Idle ....................................................... ..159
Cruise Test - Part 1 ...............................................160
Cruise Test - Part 2 ...............................................162
Cruise Test - Part 3 ...............................................162
Vehicle Speed When Shifting Gears .....................163
Vehicle Speed When Performing and Releasing
Complete Lock-up .................................................
163
A/T POSITION .................................................164
Adjustment of A/T Position .................................. ..164
Checking of A/T Position .......................................164
ON-VEHICLE REPAIR ...............................165
SHIFT CONTROL SYSTEM ........................... .165
A/T Shift Selector Removal and Installation ..........165
AIR BREATHER HOSE .................................. .166
Removal and Installation ..................................... ..166
OIL PAN ...........................................................170
Oil Pan ................................................................. ..170
CONTROL VALVE WITH TCM ........................172
Control Valve with TCM and A/T Fluid Tempera-
ture Sensor 2 and Plug ........................................ ..
172
REAR OIL SEAL ..............................................184
Rear Oil Seal ....................................................... ..184
FLUID COOLER SYSTEM ...............................185
Exploded View ..................................................... ..185
Removal and Installation .......................................185
REMOVAL AND INSTALLATION ..............186
TRANSMISSION ASSEMBLY ........................ .186
Removal and Installation (2WD) .......................... .186
Removal and Installation (4WD) ...........................188
DISASSEMBLY AND ASSEMBLY ...........192
OVERHAUL ......................................................192
Component .......................................................... .192
Oil Channel ...........................................................199
Location of Adjusting Shims, Needle Bearings,
Thrust Washers and Snap Rings ......................... .
201
DISASSEMBLY .............................................. ..204
Disassembly ......................................................... .204
REPAIR FOR COMPONENT PARTS ..............223
Oil Pump .............................................................. .223
Front Sun Gear, 3rd One-Way Clutch ...................225
Front Carrier, Input Clutch, Rear Internal Gear .....227
Mid Sun Gear, Rear Sun Gear, High and Low Re-
verse Clutch Hub ................................................. .
232
High and Low Reverse Clutch ..............................237
Direct Clutch .........................................................239
ASSEMBLY .................................................... ..242
Assembly (1) ........................................................ .242
Adjustment ............................................................255
Assembly (2) .........................................................257
SERVICE DATA AND SPECIFICATIONS
(SDS) ........ .................................................
265
SERVICE DATA AND SPECIFICATIONS
(SDS) .............................................................. ..
265
General Specification ........................................... .265
Vehicle Speed at Which Gear Shifting Occurs .....265
Vehicle Speed at Which Lock-up Occurs/Releas-
es ......................................................................... .
266
Stall Speed ............................................................266
Line Pressure ........................................................266
Input Speed Sensor ..............................................266
Output Speed Sensor ...........................................266
Reverse Brake ......................................................266
Total End Play .......................................................267
Torque Converter ..................................................267
Revision: April 20092010 QX56

TM-20
< FUNCTION DIAGNOSIS >
A/T CONTROL SYSTEM
TCM Function
INFOID:0000000005148510
The function of the TCM is to:
• Receive input signals sent from various switches and sensors.
• Determine required line pressure, shifting poi nt, lock-up operation, and engine brake operation.
• Send required output signals to the respective solenoids.
CONTROL SYSTEM OUTLINE
The automatic transmission senses vehicle operating conditions through vari ous sensors or signals. It always
controls the optimum shift position and reduces shifting and lock-up shocks.
1. Front brake 2. Input clutch3. Direct clutch
4. High and low reverse clutch 5. Reverse brake 6. Forward brake
7. Low coast brake 8. 1st one-way clutch 9. Forward one-way clutch
10. 3rd one-way clutch 11. Front sun gear12. Input shaft
13. Mid internal gear 14. Front internal gear15. Rear carrier
16. Rear sun gear 17. Mid sun gear18. Front carrier
19. Mid carrier 20. Rear internal gear21. Output shaft
22. Parking gear 23. Parking pawl
SCIA1519E
Revision: April 20092010 QX56

A/T CONTROL SYSTEMTM-21
< FUNCTION DIAGNOSIS >
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CONTROL SYSTEM DIAGRAM
CAN CommunicationINFOID:0000000005148511
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only. For details, refer to LAN-4,
"System Description".
SENSORS (or SIGNALS)
⇒TCM
⇒ACTUATORS
Transmission range switch
Accelerator pedal position sensor
Closed throttle position signal
Wide open throttle position signal
Engine speed signal
A/T fluid temperature sensor
Output speed sensor
Vehicle speed signal
Stop lamp switch signal
Input speed sensor
1st position switch signal
4th position switch signal
ATF pressure switch 2 signal
Tow mode switch signal Shift control
Line pressure control
Lock-up control
Engine brake control
Timing control
Fail-safe control
Self-diagnosis
CONSULT-III co
mmunication
line
Duet-EA control
CAN system Input clutch solenoid valve
Direct clutch solenoid valve
Front brake solenoid valve
High and low reverse clutch sole-
noid valve
Low coast brake solenoid valve
Torque converter clutch solenoid
valve
Line pressure solenoid valve
A/T CHECK indicator lamp
Starter relay
Back-up lamp relay
JSDIA1315GB
Revision: April 20092010 QX56

TM-22
< FUNCTION DIAGNOSIS >
A/T CONTROL SYSTEM
Input/Output Signal of TCM
INFOID:0000000005148512
*1: Spare for output speed sensor
*2: Spare for accelerator pedal position signal
*3: If these input and output signals are different, the TCM triggers the fail-safe function.
*4: CAN comm unications
*5: Used as a condition for starting self-diagnostics; if self-diagnostics are not started, it is judged that there is some kin d of error.
*6: A/T fluid temperature sensor 2 does not have any function.
Line Pressure ControlINFOID:0000000005148513
• When an input torque signal equivalent to the engine drive force is sent from the ECM to the TCM, the TCM
controls the line pressure solenoid.
Control item Line
pres- sure
control Vehicle
speed
control S h i f t
control Lock-up
control Engine
brake
control Fail-safe
function (*3) Self-diag-
nostics
function
Input Accelerator pedal position signal
(*4)XXXXX X X
Output speed sensor X X X X X X
Vehicle speed signal
(*1) (*4)XXXX X
Closed throttle position signal
(*4)(*2) X (*2) X X (*2) X(*5) X
Wide open throttle position signal
(*4)(*2) X (*2) X (*2) X(*5) X
Input speed sensor 1 X XXX X
Input speed sensor 2
(for 4th speed only) XX X
X X
Engine speed signals
(*4)XX
Transmission range switch X X X X X X X
Stop lamp switch signal
(*4)XXX (*5) X
A/T fluid temperature sensors 1, 2 (*6) X X X X X X X
ASCD Operation signal
(*4)XXXX
Overdrive cancel sig-
nal
(*4)XXX
TCM power supply voltage signal X X X X X X
Output Direct clutch solenoid
X XX X
Input clutch solenoid X XX X
High and low reverse clutch solenoid X XX X
Front brake solenoid X XX X
Low coast brake solenoid (ATF pressure
switch 2) XX X X X
Line pressure solenoid X X X X X X X
TCC solenoid XX X
Starter relay XX
Revision: April 20092010 QX56

TM-24
< FUNCTION DIAGNOSIS >
A/T CONTROL SYSTEM
The necessary and adequate line pressure for shift change is set.
For this reason, line pressure pattern setting corresponds to input
torque and gearshift selection. Also, line pressure characteristic is
set according to engine speed, during engine brake operation.
At Low Fluid Temperature
When the A/T fluid temperature drops below the prescribed tempera-
ture, in order to speed up the action of each friction element, the line
pressure is set higher than the normal line pressure characteristic.
Shift ControlINFOID:0000000005148514
The clutch pressure control solenoid is controlled by the signals from the switches and sensors. Thus, the
clutch pressure is adjusted to be appropriate to the engine load state and vehicle driving state. It becomes
possible to finely control the clutch hydraulic pressure with high precision and a smoother shift change charac-
teristic is attained.
SHIFT CHANGE
The clutch is controlled with the optimum timing and oil pressure by the engine speed, engine torque informa-
tion, etc.
Shift Change System Diagram
PCIA0010E
PCIA0011E
PCIA0012E
Revision: April 20092010 QX56