2006 INFINITI QX56 checking oil

AT-4Revision: November 20092006 QX56
Shift Lock Control Unit Reference Values ............
.223
Component Inspection ......................................... .224
SHIFT CONTROL SYSTEM ................................... .226
Control Device Removal and Installation ............. .226
Adjustment of A/T Position .................................. .227
Checking of A/T Position ..................................... .227
ON-VEHICLE SERVICE ......................................... .228
Oil Pan ................................................................. .228
Control Valve With TCM and A/T Fluid Temperature
Sensor 2 .............................................................. .230
Rear Oil Seal ....................................................... .240
AIR BREATHER HOSE .......................................... .241
Removal and Installation ..................................... .241
TRANSMISSION ASSEMBLY ............................... .243
Removal and Installation (2WD) .......................... .243
Removal and Installation (4WD) .......................... .246
OVERHAUL ............................................................ .250
Components ........................................................ .250
Oil Channel .......................................................... .258
Locations of Adjusting Shims, Needle Bearings,
Thrust Washers and Snap Rings ......................... .260
DISASSEMBLY ...................................................... .264
Disassembly ........................................................ .264
REPAIR FOR COMPONENT PARTS ..................... .282
Oil Pump .............................................................. .282Front Sun Gear, 3rd One-Way Clutch ..................
.284
Front Carrier, Input Clutch, Rear Internal Gear .... .286
Mid Sun Gear, Rear Sun Gear, High and Low
Reverse Clutch Hub ............................................. .291
High and Low Reverse Clutch ............................. .296
Direct Clutch ........................................................ .298
ASSEMBLY ............................................................ .300
Assembly (1) ........................................................ .300
Adjustment ........................................................... .313
Assembly (2) ........................................................ .316
SERVICE DATA AND SPECIFICATIONS (SDS) ... .323
General Specifications ......................................... .323
Vehicle Speed When Shifting Gears .................... .323
Vehicle Speed When Performing and Releasing
Complete Lock-up ................................................ .324
Vehicle Speed When Performing and Releasing
Slip Lock-up ......................................................... .324
Stall Speed ........................................................... .324
Line Pressure ....................................................... .324
A/T Fluid Temperature Sensor ............................. .324
Turbine Revolution Sensor ................................... .324
Vehicle Speed Sensor A/T (Revolution Sensor) .. .324
Reverse brake ...................................................... .325
Total End Play ...................................................... .325

AT-8
PRECAUTIONS
Revision: November 20092006 QX56
Precautions ECS00CDL

Before connecting or disconnecting the A/T assembly har-
ness connector, turn ignition switch “OFF” and disconnect
negative battery cable. Because battery voltage is applied
to TCM even if ignition switch is turned “OFF”.

After performing each TROUBLE DIAGNOSIS, perform
“DTC (Diagnostic Trouble Code) CONFIRMATION PROCE-
DURE”.
If the repair is completed the DTC should not be displayed
in the “DTC CONFIRMATION PROCEDURE”.

Always use the specified brand of ATF. Refer to MA-11, "RECOMMENDED FLUIDS AND LUBRICANTS" .

Use paper rags not cloth rags during work.

After replacing the ATF, dispose of the waste oil using the methods prescribed by law, ordinance, etc.

Before proceeding with disassembly, thoroughly clean the outside of the transmission. It is important to
prevent the internal parts from becoming contaminated by dirt or other foreign matter.

Disassembly should be done in a clean work area.

Use lint-free cloth or towels for wiping parts clean. Common shop rags can leave fibers that could interfere
with the operation of the transmission.

Place disassembled parts in order for easier and proper assembly.

All parts should be carefully cleaned with a general purpose, non-flammable solvent before inspection or
reassembly.

Gaskets, seals and O-rings should be replaced any time the transmission is disassembled.

It is very important to perform functional tests whenever they are indicated.

The valve body contains precision parts and requires extreme care when parts are removed and serviced.
Place disassembled valve body parts in order for easier and proper assembly. Care will also prevent
springs and small parts from becoming scattered or lost.

Properly installed valves, sleeves, plugs, etc. will slide along bores in valve body under their own weight.

Before assembly, apply a coat of recommended ATF to all parts. Apply petroleum jelly to protect O-rings
and seals, or hold bearings and washers in place during assembly. Do not use grease.

Extreme care should be taken to avoid damage to O-rings, seals and gaskets when assembling.

Clean or replace ATF cooler if excessive foreign material is found in oil pan or clogging strainer. Refer to
AT- 1 4 , "
A/T Fluid Cooler Cleaning" .

After overhaul, refill the transmission with new ATF.

When the A/T drain plug is removed, only some of the fluid is drained. Old A/T fluid will remain in torque
converter and ATF cooling system.
Always follow the procedures under “Changing A/T Fluid” in the AT section when changing A/T fluid. Refer
to AT- 1 2 , "
Changing Automatic Transmission Fluid (ATF)" , AT- 1 2 , "Checking Automatic Transmission
Fluid (ATF)" .
SEF289H
SEF217U

AT-12
A/T FLUID
Revision: November 20092006 QX56
A/T FLUIDPFP:KLE40
Changing Automatic Transmission Fluid (ATF)ECS00EPX
1. Drive the vehicle to warm up the ATF to 80° C (176 ° F).
2. Stop the engine.
3. Remove the ATF level gauge bolt.
4. Drain the ATF from the drain plug hole and then install the drain plug with a new gasket. Refill the transmission with new ATF.
Always refill with the same volume as the drained ATF. Use the
ATF level gauge to check the ATF level as shown. Add ATF as
necessary.

To flush out the old ATF from the coolers, pour new ATF into the charging pipe with the engine idling
and at the same time drain the old ATF from the auxiliary transmission oil cooler hose return line.

When the color of the ATF coming out of the auxiliary transmission oil cooler hose return line is about
the same as the color of the new ATF, flushing out the old ATF is complete. The amount of new trans-
mission ATF used for flushing should be 30% to 50% of the specified capacity.
CAUTION:

Use only the specified ATF. Do not mix with other fluids.

Using an ATF other than the specified ATF will cause deterioration in driveability and automatic
transmission durability, and may damage the automatic transmission, which is not covered by
the warranty.

When filling the transmission with ATF, do not spill the ATF on any heat generating parts such
as the exhaust manifold.

Do not reuse the drain plug gasket.
5. Install the ATF level gauge in the ATF charging pipe and tighten the level gauge bolt to specification.
6. Drive the vehicle to warm up the ATF to 80 ° C (176 ° F).
7. Check the ATF level and condition. Refer to AT- 1 2 , "
Checking Automatic Transmission Fluid (ATF)" . If the
ATF is still dirty, repeat steps 2 through 5.
Checking Automatic Transmission Fluid (ATF)ECS00EPY
1. Remove the ATF level gauge bolt.
2. Before driving, the ATF level can be checked at ATF tempera- tures of 30 ° to 50 °C (86 ° to 122 °F) using the “COLD” range on
the ATF level gauge as follows:
a. Park the vehicle on a level surface and set the parking brake.
b. Start the engine and move the selector lever through each gear position. Shift the selector lever into the “P” position.
c. Check the ATF level with the engine idling.
d. Remove the ATF level gauge and wipe it clean with a lint-free paper.
CAUTION:
When wiping the ATF from the ATF level gauge, always use
a lint-free paper, not a cloth.Drain plug : Refer to
AT- 2 5 0 , "
Components" .
WLIA0014E
ATF type and capacity : Refer to MA-11, "Fluids and Lubricants" .
Drain plug : Refer to AT- 2 5 0 , "
Components" .
Level gauge bolt : Refer to AT- 2 5 0 , "
Components" .
WLIA0014E

TROUBLE DIAGNOSIS FOR SYMPTOMSAT-181
DE
F
G H
I
J
K L
M A
B
AT
Revision: November 2009 2006 QX56
3. CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to AT- 2 3 0 , "
Control Valve With TCM and A/T Fluid Temperature Sensor 2" .
2. Check A/T fluid condition. Refer to AT- 1 2 , "
Checking Automatic
Transmission Fluid (ATF)" .
OK or NG
OK >> INSPECTION END
NG >> GO TO 4.
4. DETECT MALFUNCTIONING ITEM

Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to AT- 6 1 ,
"Symptom Chart" (Symptom No.58).
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.
In “N” Position, Vehicle MovesECS00CK6
SYMPTOM:
Vehicle moves forward or backward when selecting “N” position.
DIAGNOSTIC PROCEDURE
1. CHECK PNP SWITCH CIRCUIT
Perform self-diagnosis. Refer to AT- 8 6 , "
SELF-DIAGNOSTIC RESULT MODE" .
Do the self-diagnostic results indicate PNP switch?
YES >> Check the malfunctioning system. Refer to AT- 1 0 5 , "DTC P0705 PARK/NEUTRAL POSITION
SWITCH" .
NO >> GO TO 2.
2. CHECK CONTROL CABLE
Check the control cable.

Refer to AT- 2 2 7 , "Checking of A/T Position" .
OK or NG
OK >> GO TO 3.
NG >> Adjust control cable. Refer to AT- 2 2 7 , "
Adjustment of A/
T Position" .
SCIA5199E
LCIA0345E

AT-182
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: November 20092006 QX56
3. CHECK A/T FLUID LEVEL
Check A/T fluid level. Refer to AT- 1 2 , "
Checking Automatic Trans-
mission Fluid (ATF)" .
OK or NG
OK >> GO TO 4.
NG >> Refill ATF.
4. CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to AT- 2 3 0 , "
Control Valve With TCM and A/T Fluid Temperature Sensor 2" .
2. Check A/T fluid condition. Refer to AT- 1 2 , "
Checking Automatic
Transmission Fluid (ATF)" .
OK or NG
OK >> GO TO 5.
NG >> Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to AT- 6 1 , "
Symp-
tom Chart" (Symptom No.60).
5. CHECK SYMPTOM
Check again. Refer to AT- 5 5 , "
Check at Idle" .
OK or NG
OK >> INSPECTION END
NG >> GO TO 6.
6. PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to AT- 8 3 , "
TCM Input/Output Signal Reference Val-
ues" .
2. If NG, recheck A/T assembly harness connector terminals for damage or loose connection with harness connector.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.
Large Shock (“N” to “D” Position)ECS00CK7
SYMPTOM:
A noticeable shock occurs when the selector lever is shifted from the “N” to “D” position.
DIAGNOSTIC PROCEDURE
1. CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to AT- 8 6 , "
SELF-DIAGNOSTIC RESULT MODE" .
Do the self-diagnostic results indicate A/T fluid temperature sensor, engine speed signal, accelerator pedal
position sensor, ATF pressure switch 1, front brake solenoid valve, CAN communication line?
YES >> Check the malfunctioning system. Refer to AT- 1 2 7 , "DTC P1710 A/T FLUID TEMPERATURE
SENSOR CIRCUIT" , AT- 11 6 , "DTC P0725 ENGINE SPEED SIGNAL" ., AT- 1 2 4 , "DTC P1705
SAT638A
SCIA5199E

AT-184
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: November 20092006 QX56
6. DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to AT- 2 3 0 , "
Control Valve With TCM and A/T Fluid Temperature Sen-
sor 2" .
2. Disassemble A/T. Refer to AT- 2 6 4 , "
Disassembly" .
3. Check the following items:
–Oil pump assembly. Refer to AT- 2 8 2 , "Oil Pump" .
OK or NG
OK >> GO TO 8.
NG >> Repair or replace damaged parts.
7. DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to AT- 2 3 0 , "
Control Valve With TCM and A/T Fluid Temperature Sen-
sor 2" .
2. Disassemble A/T. Refer to AT- 2 6 4 , "
Disassembly" .
3. Check the following items:
–Oil pump assembly. Refer to AT- 2 8 2 , "Oil Pump" .
–Power train system. Refer to AT- 2 6 4 , "Disassembly" .
–Transmission case. Refer to AT- 2 6 4 , "Disassembly" .
OK or NG
OK >> GO TO 8.
NG >> Repair or replace damaged parts.
8. CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to AT- 2 3 0 , "
Control Valve With TCM and A/T Fluid Temperature Sensor 2" .
2. Check A/T fluid condition. Refer to AT- 1 2 , "
Checking Automatic
Transmission Fluid (ATF)" .
OK or NG
OK >> GO TO 10.
NG >> GO TO 9.
9. DETECT MALFUNCTIONING ITEM

Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to AT- 6 1 ,
"Symptom Chart" (Symptom No.1).
OK or NG
OK >> GO TO 10.
NG >> Repair or replace damaged parts.
10. CHECK SYMPTOM
Check again. Refer to AT- 5 5 , "
Check at Idle" .
OK or NG
OK >> INSPECTION END
NG >> GO TO 11.
SCIA5199E

AT-192
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: November 20092006 QX56
3. CHECK ACCELERATOR PEDAL POSITION (APP) SENSOR
Check accelerator pedal position (APP) sensor. Refer to AT- 1 2 4 , "
DTC P1705 THROTTLE POSITION SEN-
SOR"
OK or NG
OK >> GO TO 4.
NG >> Repair or replace accelerator pedal position (APP) sensor.
4. CHECK A/T FLUID LEVEL
Check A/T fluid level. Refer to AT- 1 2 , "
Checking Automatic Trans-
mission Fluid (ATF)" .
OK or NG
OK >> GO TO 5.
NG >> Refill ATF.
5. CHECK LINE PRESSURE
Check line pressure at the engine stall point. Refer to AT- 5 2 , "
LINE
PRESSURE TEST" .
OK or NG
OK >> GO TO 8.
NG - 1 >> Line pressure high. GO TO 6.
NG - 2 >> Line pressure low. GO TO 7.
6. DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to AT- 2 3 0 , "
Control Valve With TCM and A/T Fluid Temperature Sen-
sor 2" .
2. Disassemble A/T. Refer to AT- 2 6 4 , "
Disassembly" .
3. Check the following items:
–Oil pump assembly. Refer to AT- 2 8 2 , "Oil Pump" .
OK or NG
OK >> GO TO 8.
NG >> Repair or replace damaged parts.
SAT638A
SAT494G

TROUBLE DIAGNOSIS FOR SYMPTOMSAT-199
DE
F
G H
I
J
K L
M A
B
AT
Revision: November 2009 2006 QX56
P1705 THROTTLE POSITION SENSOR" , AT- 111 , "DTC P0720 VEHICLE SPEED SENSOR A/T
(REVOLUTION SENSOR)" , AT- 1 3 2 , "DTC P1721 VEHICLE SPEED SENSOR MTR" .
NO >> GO TO 3.
3. CHECK A/T FLUID LEVEL
Check A/T fluid level. Refer to AT- 1 2 , "
Checking Automatic Trans-
mission Fluid (ATF)" .
OK or NG
OK >> GO TO 4.
NG >> Refill ATF.
4. CHECK LINE PRESSURE
Check line pressure at the engine stall point. Refer to AT- 5 2 , "
LINE
PRESSURE TEST" .
OK or NG
OK >> GO TO 7.
NG - 1 >> Line pressure high. GO TO 5.
NG - 2 >> Line pressure low. GO TO 6.
5. DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to AT- 2 3 0 , "
Control Valve With TCM and A/T Fluid Temperature Sen-
sor 2" .
2. Disassemble A/T. Refer to AT- 2 6 4 , "
Disassembly" .
3. Check the following items:
–Oil pump assembly. Refer to AT- 2 8 2 , "Oil Pump" .
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
6. DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to AT- 2 3 0 , "
Control Valve With TCM and A/T Fluid Temperature Sen-
sor 2" .
2. Disassemble A/T. Refer to AT- 2 6 4 , "
Disassembly" .
3. Check the following items:
–Oil pump assembly. Refer to AT- 2 8 2 , "Oil Pump" .
–Power train system. Refer to AT- 2 6 4 , "Disassembly" .
–Transmission case. Refer to AT- 2 6 4 , "Disassembly" .
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
SAT638A
SAT494G