fl sensor INFINITI QX56 2008 Factory Service Manual

TM-174
< PRECAUTION >
PRECAUTIONS
5. When the repair work is completed, return the ignition switch to the ″LOCK ″ position before connecting
the battery cables. (At this time, the steering lock mechanism will engage.)
6. Perform a self-diagnosis check of a ll control units using CONSULT-III.
Precaution for On Board Diagnosis (OBD) System of A/T and EngineINFOID:0000000001531485
The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn the
driver of a malfunction causing emission deterioration.
CAUTION:
• Be sure to turn the ignition switch “OFF” and disconnect the negative battery cable before any repair
or inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc. Will
cause the MIL to light up.
• Be sure to connect and lock the connectors secure ly after work. A loose (unlocked) connector will
cause the MIL to light up due to an open circuit. (Be sure the connector is free from water, grease,
dirt, bent terminals, etc.)
• Be sure to route and secure th e harnesses properly after work. Interference of the harness with a
bracket, etc. May cause the MIL to light up due to a short circuit.
• Be sure to connect rubber tubes properly afte r work. A misconnected or disconnected rubber tube
may cause the MIL to light up due to a malfunction of the EGR system or fuel injection system, etc.
• Be sure to erase the unnecessary malfunction informa tion (repairs completed) from the TCM and
ECM before returning the vehicle to the customer.
PrecautionINFOID:0000000001531486
NOTE:
If any malfunctions occur in the RE5R05A model tr ansmission, replace the entire transmission assem-
bly.
• Before connecting or disconn ecting the TCM harness connec-
tor, turn ignition switch “O FF” and disconnect negative bat-
tery 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 PROCEDURE”.
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-12, "
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 pre- vent the internal parts from becoming cont aminated 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.
SEF289H
SEF217U
Revision: March 2010 2008 QX56

TM-188
< ON-VEHICLE MAINTENANCE >
LINE PRESSURE TEST
5. Start the engine, then measure the line pressure at both idle andthe stall speed.
CAUTION:
• Keep the brake pedal pressed all the way down duringmeasurement.
• When measuring the line pressure at the stall speed, refer
to TM-185, "
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
Sta ll sp ee d 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: March 2010
2008 QX56

CONTROL VALVE WITH TCMTM-201
< ON-VEHICLE REPAIR >
CEF
G H
I
J
K L
M A
B
TM
N
O P
CONTROL VALVE WITH TCM
Control Valve with TCM and A/T Fluid Temperature Sensor 2INFOID:0000000006211127
COMPONENTS
CONTROL VALVE WITH TCM REMOVAL AND INSTALLATION
Removal
1. Disconnect negative battery terminal.
2. Drain A/T fluid. Refer to TM-180, "
Changing the A/T Fluid (ATF)".
3. Disconnect A/T assembly harness connector.
1. Transmission 2. Snap ring3. Sub-harness
4. Control valve with TCM 5. Bracket6. A/T fluid temperature sensor 2
7. Oil pan gasket 8. Brackets9. Oil pan bolt
10. Oil pan 11. Magnet12. Drain plug
13. Drain plug gasket 14. Terminal cord assembly 15. O-ring
16. O-ring 17. Plug
A/T fluid temperature sensor 2 (A) can be changed to plug (B), depending on vehicles.
JSDIA1425GB
Revision: March 2010 2008 QX56

TM-202
< ON-VEHICLE REPAIR >
CONTROL VALVE WITH TCM
4. Remove snap ring from A/T assembly harness connector.
5. Push A/T assembly harness connector.CAUTION:
Do not damage connector.
6. Remove oil pan and oil pan gasket. Refer to TM-199, "
Oil Pan".
7. If an A/T fluid temperature sensor 2 is attached, disconnect the A/T fluid temperature sensor 2 connector
as shown below.
a. Disconnect A/T fluid temperat ure sensor 2 connector (A).
CAUTION:
Do not damage connector.
b. Straighten the four terminal clips ( ) to free the terminal cord assembly for A/T fluid temperature sensor 2 harness.
8. Straighten terminal clip ( ) to free the output speed sensor har- ness.
9. Disconnect output speed sensor connector (1). CAUTION:
Do not damage connector.
SCIA5021E
SCIA5022E
SCIA8124E
JSDIA1316ZZ
Revision: March 2010 2008 QX56

CONTROL VALVE WITH TCMTM-203
< ON-VEHICLE REPAIR >
CEF
G H
I
J
K L
M A
B
TM
N
O P
10. Remove bolts (A), (B) and (C) from control valve with TCM.
11. Remove control valve with TCM from transmission case. CAUTION:
When removing, be careful with the manual valve notch and
manual plate height. Remove it vertically.
12. Remove the A/T fluid temperature sensor 2 or plug as shown below.
a. A/T fluid temperature sensor 2
i. Remove A/T fluid temperature sensor 2 with bracket from con- trol valve with TCM.
ii. Remove bracket from A/T fluid temperature sensor 2.
b. Plug
: Front
Bolt symbol Length mm (in) Number of bolts
A 42 (1.65) 5
B 55 (2.17) 6
C 40 (1.57) 1
SCIA8074E
SCIA5142E
SCIA5253E
SCIA5264E
Revision: March 2010 2008 QX56

CONTROL VALVE WITH TCMTM-205
< ON-VEHICLE REPAIR >
CEF
G H
I
J
K L
M A
B
TM
N
O P
15. Remove A/T assembly harness connector from control valve with TCM using suitable tool.
16. Disconnect TCM connector (1) and transmission range switch connector. (2)
CAUTION:
Do not damage connectors.
Installation
CAUTION:
• If the A/T fluid temperature sensor 2 has flaws, replace it with a plug.
• After completing installation, check A/T fluid leakage and fluid level. Refer to TM-178, "
Checking the
A/T Fluid (ATF)".
1. Connect TCM connector (1) and transmission range switch con- nector. (2)
2. Install A/T assembly harness connector to control valve with TCM.
SCIA5448E
JSDIA1317ZZ
JSDIA1317ZZ
SCIA5450E
Revision: March 2010 2008 QX56

TM-206
< ON-VEHICLE REPAIR >
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 the A/T fluid temperature sensor 2 or plug as shown below.
a. A/T fluid temperature sensor 2
i. Install A/T fluid temperature sensor 2 to bracket.
ii. Install A/T fluid temperature sensor 2 (with bracket) to control valve with TCM. Tighten A/T fluid temperature sensor 2 bolt to
the specified torque.
CAUTION:
Adjust bolt hole of bracket to bolt hole of control valve with
TCM.
b. Plug
NOTE:
• When replacing the A/T fluid temperature sensor 2 with the plug, the A/T fluid temperature sensor 2 con-
nector should not be connected.
• Fold the terminal clips.
SCIA5447E
SCIA5155E
SCIA5264E
SCIA5253E
Revision: March 2010 2008 QX56

CONTROL VALVE WITH TCMTM-207
< ON-VEHICLE REPAIR >
CEF
G H
I
J
K L
M A
B
TM
N
O P
i. Install new O-ring (1) in plug (2). CAUTION:
• Do not reuse O-ring.
• Apply ATF to O-ring.
• O-ring should be free of contamination.
ii. Install plug (2) to bracket (1).
iii. Install plug (1) [with bracket (2)] to control valve with TCM. Tighten plug bolt ( ) to the specified torque.
CAUTION:
Adjust bolt hole of bracket to bolt hole of control valve with
TCM.
6. Install control valve with TCM in transmission case. CAUTION:
• Make sure that input speed sensor is securely installed
into input speed sensor hole (A).
• Hang down output speed sensor harness toward outside
so as not to disturb installati on of control valve with TCM.
• Adjust A/T assembly harness connector of control valve with TCM to terminal hole of transmission case.
• Assemble it so that manual valve cutout is engaged with
manual plate projection.
JSDIA1313ZZ
JSDIA1312ZZ
JSDIA1311ZZ
1 : Brake band
JSDIA1318ZZ
SCIA5142E
Revision: March 2010 2008 QX56

TM-208
< ON-VEHICLE REPAIR >
CONTROL VALVE WITH TCM
7. Install bolts (A), (B) and (C) in control valve with TCM.
8. Tighten bolt (1A), (2B) and (3A) temporarily to prevent disloca-tion. After that tighten them in order (1 → 2 → 3).
9. Tighten control valve with TCM bolts to the specified torque.
10. After installing the A/T fluid temperature sensor 2, connect the A/T fluid temperature sensor 2 connector
as shown below.
a. Connect A/T fluid temperature sensor 2 connector (A).
b. Securely fasten terminal cord assembly and A/T fluid tempera- ture sensor 2 harness with terminal clips ( ).
11. Connect output speed sensor connector. (1)
: Front
Bolt symbol Length mm (in) Number of bolts
A 42 (1.65) 5
B 55 (2.17) 6
C 40 (1.57) 1
SCIA8074E
: Front
Bolt symbol AB C
Number of bolts 56 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
SCIA8124E
JSDIA1319ZZ
Revision: March 2010 2008 QX56

CONTROL VALVE WITH TCMTM-209
< ON-VEHICLE REPAIR >
CEF
G H
I
J
K L
M A
B
TM
N
O P
12. Securely fasten output speed sensor (1) harness with terminal clip ( ).
13. Install oil pan to transmission case. Refer to TM-199, "
Oil Pan".
14. Pull up A/T assembly harness connector. CAUTION:
Do not damage connector.
15. Install snap ring to A/T assembly harness connector.
16. Connect A/T assembly harness connector.
17. Connect the negative battery terminal.
18. Refill the A/T with fluid and check the fluid level and for fluid leakage. Refer to TM-178, "
Checking the A/T Fluid (ATF)".
REMOVAL AND INSTALLATION OF A/T FLUID TEMPERATURE SENSOR 2
Removal
1. Disconnect negative battery terminal.
2. Remove oil pan and oil pan gasket. Refer to TM-199, "
Oil Pan".
3. Disconnect A/T fluid temperat ure sensor 2 connector (A).
CAUTION:
Do not damage connector.
4. Straighten terminal clip to free A/T fluid temperature sensor 2 harness.
JSDIA1316ZZ
SCIA5038E
SCIA5039E
SCIA8125E
Revision: March 2010 2008 QX56