2004 INFINITI QX56 ECU

TRANSMISSION ASSEMBLY
AT-257
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B
AT
Revision: August 20072004 QX56
INSTALLATION
Installation of the remaining components is in the reverse order of
the removal, while paying attention to the following work.

If removed install drive plate.
–Align dowel pin of crankshaft rear end with pin holes of each
parts to install.
–Install drive plate, reinforcement plate and pilot converter as
shown.
–Face chamfered or rounded edge side to crankshaft.
CAUTION:

When replacing an engine or transmission you must make
sure the dowels are installed correctly during re-assembly.

Improper alignment caused by missing dowels may cause
vibration, oil leaks or breakage of drivetrain components.

When installing transmission to the engine, attach the bolts in
accordance with the following standard.
*: No.2 bolt also secures air breather vent.
–Align the positions of tightening bolts for drive plate with those of
the torque converter, and temporarily tighten the bolts. Then,
tighten the bolts with the specified torque.
CAUTION:

When turning crankshaft, turn it clockwise as viewed from the front of the engine.

After converter is installed to drive plate, rotate crankshaft several turns and check to be sure that
transmission rotates freely without binding.

After completing installation, check fluid leakage, fluid level, and the positions of A/T. Refer to AT-13,
"Checking A/T Fluid" , AT-234, "Checking of A/T Position" , AT-234, "Adjustment of A/T Position" .
KBIA2494E
KBIA2537E
Bolt No. 1 2* 3
Number of bolts 4 1 4
Bolt length
“”mm (in)70 (2.76) 70 (2.76) 70 (2.76)
Tightening torque
N·m (kg-m, ft-lb)11 3
(12, 83)11 3
(12, 83)
LCIA0371E
LCIA0335E

TRANSMISSION ASSEMBLY
AT-259
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Revision: August 20072004 QX56
8. Remove crankshaft position sensor (POS) from A/T assembly.
9. Disconnect A/T fluid cooler tube from A/T assembly.
10. Remove dust cover from converter housing part.
11. Turn crankshaft, and remove the four tightening bolts for drive
plate and torque converter.
CAUTION:
When turning crankshaft, turn it clockwise as viewed from
the front of the engine.
12. Support A/T assembly with a transmission jack.
CAUTION:
When setting the transmission jack, be careful not to allow
it to collide against the drain plug.
13. Remove cross member with power tool.
14. Tilt the transmission slightly to keep the clearance between body
and transmission, and then disconnect air breather hose from charging pipe. Refer to AT- 2 5 3 , "
Removal
and Installation" .
15. Disconnect A/T assembly connector and transfer unit connector.
16. Remove A/T fluid indicator pipe.
17. Plug up openings such as the fluid charging pipe hole, etc.
18. Remove A/T assembly to engine bolts with power tool.
19. Remove A/T assembly from vehicle using Tool and a transmis-
sion jack.

Secure torque converter to prevent it from dropping.

Secure A/T assembly to a transmission jack.
NOTE:
The actual special service Tool may differ from Tool shown.
20. Remove transfer from A/T assembly. Refer to TF-109,
"REMOVAL AND INSTALLATION" .
INSPECTION
Installation and Inspection of Torque Converter

After inserting a torque converter to a transmission, be sure to
check dimension A to ensure it is within the reference value
limit.
LCIA0334E
Tool number : — (J-47002)
LCIA0335E
SCIA0499E
Dimension A : 24.0 mm (0.94 in) or more
SAT0 1 7B

AT-260
TRANSMISSION ASSEMBLY
Revision: August 20072004 QX56
INSTALLATION
Installation of the remaining components is in the reverse order of
the removal, while paying attention to the following work.

If removed, install drive plate.
–Align dowel pin of crankshaft rear end with pin holes of each
parts to install.
–Install drive plate, reinforcement plate and pilot converter as
shown.
–Face chamfered or rounded edge side to crankshaft.
CAUTION:

When replacing an engine or transmission you must make
sure the dowels are installed correctly during re-assembly.

Improper alignment caused by missing dowels may cause
vibration, oil leaks or breakage of drivetrain components.

When installing transmission to the engine, attach the bolts in
accordance with the following standard.
*: No.2 bolt also secures air breather vent.
–Align the positions of tightening bolts for drive plate with those of
the torque converter, and temporarily tighten the bolts. Then,
tighten the bolts with the specified torque.
CAUTION:

When turning crankshaft, turn it clockwise as viewed from the front of the engine.

After converter is installed to drive plate, rotate crankshaft several turns and check to be sure that
transmission rotates freely without binding.

After completing installation, check fluid leakage, fluid level, and the positions of A/T. Refer to AT-13,
"Checking A/T Fluid" , AT-234, "Checking of A/T Position" , AT-234, "Adjustment of A/T Position" .
KBIA2494E
KBIA2537E
Bolt No. 1 2* 3
Number of bolts 4 1 4
Bolt length
“”mm (in)70 (2.76) 70 (2.76) 70 (2.76)
Tightening torque
N·m (kg-m, ft-lb)11 3
(12, 83)11 3
(12, 83)
LCIA0371E
LCIA0335E

AT-276
DISASSEMBLY
Revision: August 20072004 QX56
14. Loosen lock nut and remove band servo anchor end pin from
transmission case.
15. Remove brake band from transmission case.

To prevent brake linings from cracking or peeling, do not
stretch the flexible band unnecessarily. When removing
the brake band, always secure it with a clip as shown in
the figure at left.
Leave the clip in position after removing the brake band.

Check brake band facing for damage, cracks, wear or
burns.
16. Remove mid carrier assembly and rear carrier assembly as a
unit.
SCIA5016E
SCIA5345E
SAT6 5 5
SCIA5344E

AT-312
ASSEMBLY
Revision: August 20072004 QX56
17. Set SST on spring retainer and install snap ring (fixing spring
retainer) in transmission case while compressing return spring.
CAUTION:
Securely assemble them using a flat-bladed screwdriver so
that snap ring tension is slightly weak.
18. Install reverse brake drive plates, driven plates and dish plate in
transmission case.
CAUTION:
Take care with the order and direction of plates.
SCIA5217E
SCIA5342E

AT-326
ASSEMBLY
Revision: August 20072004 QX56
8. Make sure that brake band does not close turbine revolution
sensor hole.
9. Install control valve with TCM.
a. Install A/T fluid temperature sensor 2 to bracket.
b. Install A/T fluid temperature sensor 2 (with bracket) in control
valve with TCM. Tighten A/T fluid temperature sensor 2 mount-
ing bolt to the specified torque. Refer to AT-261, "
Components"
.
CAUTION:
Adjust bolt hole of bracket to bolt hole of control valve with
TCM.
c. Install O-ring to A/T assembly harness connector.
CAUTION:

Do not reuse O-ring.

Apply ATF to O-ring.
d. Install control valve with TCM in transmission case.
CAUTION:

Make sure that turbine revolution sensor securely installs
turbine revolution sensor hole.

Adjust A/T assembly harness connector of control valve
with TCM to terminal hole of transmission case.

Hang down revolution sensor harness toward outside so
as not to disturb installation of control valve with TCM.
SCIA5034E
SCIA5264E
SCIA5301E
SCIA5155E
SCIA5034E

ASSEMBLY
AT-327
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Revision: August 20072004 QX56

Assemble it so that manual valve cutout is engaged with
manual plate projection.
e. Install bolts A, B and C to control valve with TCM.
f. Tighten bolt 1, 2 and 3 temporarily to prevent dislocation. After
that tighten them in order (1 → 2 → 3), and then tighten other
bolts.
g. Tighten control valve with TCM mounting bolts to the specified
torque. Refer to AT-261, "
Components" .
10. Connect A/T fluid temperature sensor 2 connector.
11. Securely fasten A/T fluid temperature sensor 2 harness with ter-
minal clip.
SCIA5035E
Bolt symbol Length: mm (in) Number of bolts
A 42 (1.65) 5
B 55 (2.17) 6
C 40 (1.57) 1
SCIA5025E
SCIA5037E
SCIA5023E
SCIA5146E

AT-328
ASSEMBLY
Revision: August 20072004 QX56
12. Connect revolution sensor connector.
13. Securely fasten revolution sensor harness with terminal clips.
14. Pull down A/T assembly harness connector.
CAUTION:
Be careful not to damage connector.
15. Install snap ring to A/T assembly harness connector.
16. Install magnets in oil pan.
SCIA5024E
SCIA5293E
SCIA5299E
SCIA5300E
SCIA5200E