2009 INFINITI QX56 torque

SYSTEM SYMPTOMTM-173
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
60
Others Vehicle runs with
transmission in “N” po-
sition.
Refer to
TM-120, "In
"N" Position, Vehicle
Moves". ON vehicle
1. Transmission range switch
TM-44
2. Fluid level and stateTM-179
3. Control cable adjustmentTM-195
4. Control valve with TCMTM-203
OFF vehicle5. Input clutch
TM-203
6. Gear systemTM-203
7. Direct clutchTM-203
8. Reverse brakeTM-203
9. Forward one- way clutch (Parts behind drum support is im-
possible to perform inspection by disassembly. Refer to TM-
8, TM-9
TM-203
10. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to TM-8
, TM-9TM-203
61 Engine does not start
in “N” or “P” position.
Refer to
TM-119, "En-gine Cannot Be Start-
ed in "P" or "N"
Position". ON vehicle1. Ignition switch and starter
2. Control cable adjustment
TM-195
3. Transmission range switch TM-44
62Engine starts in posi-
tions other than “N” or
“P”.
ON vehicle1. Ignition switch and starter
2. Control cable adjustment
TM-195
3. Transmission range switch TM-44
63 Engine stall.ON vehicle1. Fluid level and state
TM-179
2. Engine speed signal TM-52
3. Input speed sensorTM-47
4. Torque converter clutch solenoid valveTM-64
5. CAN communication line LAN-4
6. Control valve with TCMTM-203
OFF vehicle 7. Torque converter TM-203
64Engine stalls when se-
lect lever shifted “N”
→
“D”, “R”. ON vehicle1. Fluid level and state
TM-179
2. Engine speed signal TM-52
3. Input speed sensorTM-47
4. Torque converter clutch solenoid valveTM-64
5. CAN communication line LAN-4
6. Control valve with TCMTM-203
OFF vehicle 7. Torque converter TM-203
65 OthersEngine speed does
not return to idle.
Refer to
TM-142, "En-
gine Speed Does Not
Return to Idle". ON vehicle 1. Fluid level and state
TM-179
2. Direct clutch solenoid valve TM-84
3. Front brake solenoid valveTM-82
4. Accelerator pedal position sensorTM-70
5. Output speed sensor and vehicle speed signalTM-49,
TM-74
6. CAN communication line LAN-4
7. Control valve with TCMTM-203
OFF vehicle8. Front brake (brake band)
TM-2039. Direct clutchTM-203
No. Items Symptom Condition Diagnostic Item Reference
page
Revision: December 20092009 QX56

TM-176
< PRECAUTION >
PRECAUTIONS
 All parts should be carefully cleaned with a general purpose, non-flammable solvent before inspection orreassembly.
 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 s lide 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 TM-
183, "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 con- verter and ATF cooling system.
Always follow the procedures under “Changing A/T Fluid” in the AT section when changing A/T fluid. Refer to
TM-181, "Changing the A/T Fluid (ATF)"
.
Service Notice or PrecautionINFOID:0000000003772016
ATF COOLER SERVICE
 If A/T fluid contains fictional material (clutches, bands, etc.), or if an A/T is repaired, overhauled, or replaced,
inspect and clean the A/T fluid cooler mounted in the radiat or or replace the radiator. Flush cooler lines with
cleaning solvent and compressed air after repair. For A/T fluid cooler cleaning procedure, refer to TM-183,
"A/T Fluid Cooler Cleaning". For radiator replacement, refer to CO-15, "Removal and Installation".
CHECKING AND CHANGING A/T FLUID
 Increase ATF oil temperature to 80 °C (176 °F) first, then check and adjust oil level at 65 °C (149 °F).
NOTE:
The A/T has both water cooling and air cooling systems . The air cooling system has a bypass valve. When
ATF oil temperature is at or below 50 °C (122 °F), it does not flow through the air cooled system. If A/T oil
level is adjusted without flow throughout the entir e system, the level will be 10mm lower than required.
Therefore, all piping should be filled with oil when adjusting level.
OBD-II SELF-DIAGNOSIS
 A/T self-diagnosis is performed by the TCM in combination with the ECM. Refer to the table on TM-32,
"CONSULT-III Function (TRANSMISSION)" for the indicator used to display each self-diagnostic result.
 The self-diagnostic results indicated by the MIL ar e automatically stored in both the ECM and TCM memo-
ries.
Always perform the procedure on TM-30, "OBD-II Diagnostic Trouble Code (DTC)"
to complete the
repair and avoid unnecessary blinking of the MIL.
For details of OBD-II, refer to TM-30
.
 Certain systems and components, especially those related to OBD, may use the new style slide-
locking type harness connector. For descrip tion and how to disconnect, refer to PG-68
.
Revision: December 20092009 QX56

STALL TESTTM-187
< ON-VEHICLE MAINTENANCE >
CEF
G H
I
J
K L
M A
B
TM
N
O P
4. Engine start, apply foot brake, and place selector lever in “D” position.
5. While holding down the foot brake, gradually press down the accelerator pedal.
6. Quickly read off the stall speed, then quickly remove your foot from the accelerator pedal.
CAUTION:
Do not hold down the accelerator pedal for more than 5 sec-
onds during this test.
7. Move the selector lever to the “N” position.
8. Cool down the ATF. CAUTION:
Run the engine at idle for at least one minute.
Judgement of Stall Test
O: Stall speed within standard value position
H: Stall speed higher than standard value
L: Stall speed lower than standard value
Stall test standard value position
Stall speed: 2,550 - 2,850 rpm
SAT514G
Selector lever position
Expected problem location
DR
Stall rotation HO
 Forward brake
 Forward one-way clutch
 1st one-way clutch
 3rd one-way clutch
O H  Reverse brake L L  Engine and torque converter one-way clutch
H H  Line pressure low
Does not shift-up D position 1 → 2 Slipping in 2GR, 3GR, 4GR Direct clutch slippage
Does not shift-up D position 2 → 3 Slipping in 3GR, 4GR, 5GR High and low reverse clutch slippage
Does not shift-up D position 3 → 4 Slipping in 4GR, 5GR Input clutch slippage
Does not shift-up D position 4 → 5 Slipping in 5GR Front brake slippage
Revision: December 20092009 QX56

LINE PRESSURE TESTTM-189
< ON-VEHICLE MAINTENANCE >
CEF
G H
I
J
K L
M A
B
TM
N
O P
5. Start the engine, then measure the line pressure at both idle and the stall speed.
CAUTION:
 Keep the brake pedal pressed all the way down during
measurement.
 When measuring the line pressu re at the stall speed, refer
to TM-186, "Inspection and Judgment"
.
6. After the measurements are complete, install the oil pressure detection plug and tighten to the regulation torque below.
CAUTION:
Do not reuse the O-ring.
Line Pressure
Judgement of Line Pressure Test
Oil pressure detection
plug :7.3 N·m (0.74 kg-m, 65 in-lb)SAT493G
Engine speed
Line pressure [kPa (kg/cm
2, psi)]
R position D position
At idle speed 425 - 465 (4.3 - 4.7, 62 - 67) 379 - 428 (3.9 - 4.4, 55 - 62)
At stall speed 1,605 - 1,950 (16.4 - 19.9, 233 - 283) 1,310 - 1,500 (13.4 - 15.3, 190 - 218)
Judgement Possible cause
Idle speed Low for all positions
(P, R, N, D)
Possible causes include malfunctions in the pressure supply system and low oil pump output.
For example
 Oil pump wear
 Pressure regulator valve or plug sticking or spring fatigue
 Oil strainer
⇒ oil pump ⇒ pressure regulator valve passage oil leak
 Engine idle speed too low
Only low for a spe-
cific position Possible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.
High Possible causes include a sensor malfunction or malfunction in the line pressure adjustment func-
tion.
For example
 Accelerator pedal position signal malfunction
 ATF temperature sensor malfunction
 Line pressure solenoid malfunction (sticking in “OFF” state, filter clog, cut line)
 Pressure regulator valve or plug sticking
Stall speed Oil pressure does
not rise higher than
the oil pressure for
idle.
Possible causes include a sensor malfunction or malfunction in the pressure adjustment function.
For example
 Accelerator pedal position signal malfunction
 TCM breakdown
 Line pressure solenoid malfunction (shorting, sticking in“ ON” state)
 Pressure regulator valve or plug sticking
 Pilot valve sticking or pilot filter clogged
The pressure rises,
but does not enter
the standard posi-
tion. Possible causes include malfunctions in the pressure supply system and malfunction in the pres-
sure adjustment function.
For example
 Accelerator pedal position signal malfunction
 Line pressure solenoid malfunction (sticking, filter clog)
 Pressure regulator valve or plug sticking
 Pilot valve sticking or pilot filter clogged
Only low for a spe-
cific position Possible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.
Revision: December 20092009 QX56

CONTROL VALVE WITH TCMTM-207
< ON-VEHICLE REPAIR >
CEF
G H
I
J
K L
M A
B
TM
N
O P
2. Install A/T assembly harness connector to control valve with TCM.
3. Connect TCM connector.
4. Install new O-ring in A/T assembly harness connector. CAUTION:
 Do not reuse O-ring.
 Apply ATF to O-ring.
5. Install A/T fluid temperature sensor 2 to bracket.
6. Install A/T fluid temperature sensor 2 (with bracket) to control valve with TCM. Tighten A/T flui d temperature sensor 2 bolt to
the specified torque. Refer to TM-203, "Control Valve with TCM
and A/T Fluid Temperature Sensor 2".
CAUTION:
Adjust bolt hole of bracket to bolt hole of control valve with
TCM.
SCIA5450E
SCIA5447E
SCIA5155E
SCIA5264E
SCIA5253E
Revision: December 20092009 QX56

TM-208
< ON-VEHICLE REPAIR >
CONTROL VALVE WITH TCM
7. Install control valve with TCM in transmission case.1. :Brake band
CAUTION:
 Make sure that input speed sensor is securely installed
into input speed sensor hole (A).
 Hang down output speed sen sor harness toward outside
so as not to disturb installati on of control valve with TCM.
 Adjust A/T assembly harness co nnector of control valve
with TCM to terminal hole of transmission case.
 Assemble it so that manual valve cutout is engaged with manual plate projection.
8. Install bolts (A), (B) and (C) in control valve with TCM.  : Front
9. Tighten bolt (1), (2) and (3) temporarily to prevent dislocation. After that tighten them in order (1 → 2 → 3). Then tighten other
bolts.
 : Front
10. Tighten control valve with TCM bolts to the specified torque.
JSDIA1318ZZ
SCIA5142E
Bolt symbol Length mm (in) Number of bolts
A 42 (1.65) 5
B 55 (2.17) 6
C 40 (1.57) 1
SCIA8074E
Bolt symbol A B C
Number of bolts 5 6 1
Length mm (in) 42 (1.65) 55 (2.17) 40 (1.57)
Tightening torque
N·m (km-g, in-lb) 7.9 (0.81, 70)With ATF applied
7.9 (0.81, 70)
SCIA8075E
Revision: December 20092009 QX56

CONTROL VALVE WITH TCMTM-211
< ON-VEHICLE REPAIR >
CEF
G H
I
J
K L
M A
B
TM
N
O P
2. Install A/T fluid temperature sens or 2 (with bracket) in control
valve with TCM. Tighten A/T flui d temperature sensor 2 bolt to
the specified torque. Refer to TM-203, "Control Valve with TCM
and A/T Fluid Temperature Sensor 2".
CAUTION:
Adjust bolt hole of bracket to bolt hole of control valve with
TCM.
3. Connect A/T fluid temperature sensor 2 connector (A).
4. Securely fasten A/T fluid temperature sensor 2 harness with ter- minal clip .
5. Install oil pan to transmission case. Refer to TM-201, "Oil Pan"
.
6. Connect the negative battery terminal. Refer to PG-77, "Removal and Installation"
.
7. Refill the A/T with fluid and check the fluid level and for fluid leakage. Refer to TM-179, "Checking the A/T
Fluid (ATF)".
SCIA5253E
SCIA8125E
Revision: December 20092009 QX56

TRANSMISSION ASSEMBLYTM-215
< REMOVAL AND INSTALLATION >
CEF
G H
I
J
K L
M A
B
TM
N
O P
4. Remove crankshaft position sensor (POS) from A/T assembly. CAUTION:
 Do not subject it to impact by dropping or hitting it.
 Do not disassemble.
 Do not allow metal filings or foreign material to get on the
sensor front edge magnetic area.
 Do not place in an area affected by magnetism.
5. Remove A/T fluid indicator pipe.
6. Remove exhaust front tube and center muffler using power tool. Refer to EX-6, "Removal and Installation"
.
7. Remove rear propeller shaft. Refer to DLN-196, "Removal and
Installation".
8. Disconnect A/T shift selector cable. Refer to TM-196, "A/T Shift Selector Removal and Installation"
.
9. Remove A/T fluid cooler tubes from A/T assembly.
10. 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.
11. Remove dust cover from converter housing.
12. Turn crankshaft to access and remove the four bolts for drive plate and torque converter.
CAUTION:
When turning crankshaft, turn it clockwise as viewed from
the front of the engine.
13. Remove air breather hose. Refer to TM-197, "2WD : Removal
and Installation".
14. Disconnect A/T assembly harness connector.
15. Plug any openings such as the A/T fluid indicator pipe hole.
16. Remove the A/T assembly to engine bolts using power tool.
17. Remove A/T assembly from vehicle using transmission jack. CAUTION:
 Secure torque converter to prevent it from dropping.
 Secure A/T assembly to a transmission jack.
INSPECTION
Installation and Inspection of Torque Converter
 After inserting a torque converter to a transmission, be sure to check distance A to ensure it is within specifications.
INSTALLATION
Installation is in the reverse order of removal, while paying attention to the following:
LCIA0334E
LCIA0335E
SCIA0499E
Distance A : 24.0 mm (0.94 in) or more
SAT017B
Revision: December 20092009 QX56