2008 INFINITI QX56 brake sensor

TM-168
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
44Slips/Will
Not En-
gage Vehicle cannot run in
all positions.
ON vehicle1. Fluid level and state
TM-178
2. Line pressure testTM-187
3. Transmission range switch TM-43
4. Control cable adjustmentTM-194
5. Control valve with TCMTM-201
OFF vehicle6. Oil pump assembly
TM-2507. Gear systemTM-220
8. Output shaftTM-232
45With selector lever in
“D” position, driving is
not possible. ON vehicle
1. Fluid level and state
TM-178
2. Line pressure testTM-187
3. Transmission range switch TM-43
4. Control cable adjustmentTM-194
5. Control valve with TCMTM-201
OFF vehicle6. Torque converter
TM-232
7. Oil pump assembly TM-250
8. 1st one-way clutchTM-259
9. Gear systemTM-220
10. Reverse brakeTM-232
11. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
TM-8
, TM-9
TM-232
12. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to TM-8
, TM-9TM-232
46 With selector lever in
“R” position, driving is
not possible. ON vehicle
1. Fluid level and state
TM-178
2. Line pressure testTM-187
3. Transmission range switch TM-43
4. Control cable adjustmentTM-194
5. Control valve with TCMTM-201
OFF vehicle6. Gear system
TM-2207. Output shaftTM-232
8. Reverse brakeTM-232
47 OthersShift point is high in
“D” position. ON vehicle1. Output speed sensor and vehicle speed sensor
TM-48
,
TM-74
2. Accelerator pedal position sensor TM-69
3. CAN communication line LAN-4
4. ATF temperature sensorTM-71
5. Control valve with TCMTM-201
No. ItemsSymptom Condition Diagnostic ItemReference
page
Revision: March 2010 2008 QX56

SYSTEM SYMPTOMTM-169
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
48
Others Shift point is low in “D”
position.
ON vehicle1. Output speed sensor and vehicle speed sensor
TM-48
,
TM-74
2. Accelerator pedal position sensor TM-69
3. CAN communication line LAN-4
4. Control valve with TCMTM-201
49Judder occurs during
lock-up. ON vehicle1. Fluid level and state
TM-178
2. Engine speed signal TM-51
3. Input speed sensorTM-46
4. Output speed sensor and vehicle speed sensorTM-48,
TM-74
5. Accelerator pedal position sensor TM-69
6. CAN communication line LAN-4
7. Torque converter clutch solenoid valveTM-63
8. Control valve with TCMTM-201
OFF vehicle 9. Torque converter TM-232
50Strange noise in “R”
position. ON vehicle
1. Fluid level and state
TM-178
2. Engine speed signal TM-51
3. CAN communication line LAN-4
4. Control valve with TCMTM-201
OFF vehicle5. Torque converter
TM-232
6. Oil pump assemblyTM-250
7. Gear systemTM-220
8. High and low reverse clutchTM-264
9. Reverse brakeTM-232
51Strange noise in “N”
position. ON vehicle
1. Fluid level and state
TM-178
2. Engine speed signal TM-51
3. CAN communication line LAN-4
4. Control valve with TCMTM-201
OFF vehicle5. Torque converter
TM-2326. Oil pump assemblyTM-250
7. Gear systemTM-220
52Strange noise in “D”
position. ON vehicle
1. Fluid level and state
TM-178
2. Engine speed signal TM-51
3. CAN communication line LAN-4
4. Control valve with TCMTM-201
OFF vehicle5. Torque converter
TM-232
6. Oil pump assemblyTM-250
7. Gear systemTM-220
8. Forward brake (Parts behind drum support is impossible to
perform inspection by disassembly. Refer to TM-8
, TM-9TM-232
No. Items Symptom Condition Diagnostic ItemReference
page
Revision: March 2010 2008 QX56

SYSTEM SYMPTOMTM-171
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
56
Others Maximum speed low.
ON vehicle
1. Fluid level and state
TM-178
2. Line pressure testTM-187
3. Accelerator pedal position sensor TM-69
4. CAN communication line LAN-4
5. Direct clutch solenoid valveTM-84
6. Control valve with TCMTM-201
OFF vehicle7. Torque converter
TM-232
8. Oil pump assemblyTM-250
9. Input clutchTM-254
10. Gear systemTM-220
11. High and low reverse clutchTM-264
12. Direct clutchTM-266
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
TM-8
, TM-9
TM-232
14 Forward brake (Parts behind drum support is impossible to
perform inspection by disassembly. Refer to TM-8
, TM-9TM-232
57 Extremely large creep. ON vehicle1. Engine idle speed
EC-172. CAN communication lineLAN-4
OFF vehicle 3. Torque converter TM-232
58With selector lever in
“P” position, vehicle
does not enter parking
condition or, with se-
lector lever in another
position, parking con-
dition is not cancelled.
Refer to
TM-119, "
In
"P" Position, Vehicle
Moves When
Pushed". ON vehicle
1. Transmission range switch
TM-43
2. Control cable adjustmentTM-194
OFF vehicle 3. Parking pawl components TM-220
59Vehicle runs with
transmission in “P” po-
sition. ON vehicle1. Transmission range switch
TM-43
2. Fluid level and stateTM-178
3. Control cable adjustmentTM-194
4. Control valve with TCMTM-201
5. Parking pawl componentsTM-220
OFF vehicle 6. Gear system TM-220
No. ItemsSymptom Condition Diagnostic ItemReference
page
Revision: March 2010 2008 QX56

TM-172
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
60Others Vehicle runs with
transmission in “N” po-
sition.
Refer to TM-119, "In
"N" Position, Vehicle
Moves".
ON vehicle
1. Transmission range switch
TM-43
2. Fluid level and stateTM-178
3. Control cable adjustmentTM-194
4. Control valve with TCMTM-201
OFF vehicle5. Input clutch
TM-254
6. Gear systemTM-220
7. Direct clutchTM-266
8. Reverse brakeTM-232
9. Forward one- way clutch (Parts behind drum support is im-
possible to perform inspection by disassembly. Refer to TM-
8, TM-9
TM-232
10. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to TM-8
, TM-9TM-232
61 Engine does not start
in “N” or “P” position.
Refer to TM-118, "En-
gine Cannot Be Start-
ed in "P" or "N"
Position".ON vehicle1. Ignition switch and starter
2. Control cable adjustment
TM-194
3. Transmission range switch TM-43
62Engine starts in posi-
tions other than “N” or
“P”.
ON vehicle1. Ignition switch and starter
2. Control cable adjustment
TM-194
3. Transmission range switch TM-43
63Engine stall. ON vehicle1. Fluid level and state
TM-178
2. Engine speed signal TM-51
3. Input speed sensorTM-46
4. Torque converter clutch solenoid valveTM-63
5. CAN communication line LAN-4
6. Control valve with TCMTM-201
OFF vehicle 7. Torque converter TM-232
64Engine stalls when se-
lect lever shifted “N”
→
“D”, “R”. ON vehicle1. Fluid level and state
TM-178
2. Engine speed signal TM-51
3. Input speed sensorTM-46
4. Torque converter clutch solenoid valveTM-63
5. CAN communication line LAN-4
6. Control valve with TCMTM-201
OFF vehicle 7. Torque converter TM-232
65 OthersEngine speed does
not return to idle.
Refer to TM-141, "En-
gine Speed Does Not
Return to Idle".ON vehicle 1. Fluid level and state
TM-178
2. Direct clutch solenoid valve TM-84
3. Front brake solenoid valveTM-82
4. Accelerator pedal position sensorTM-69
5. Output speed sensor and vehicle speed sensor signalTM-48,
TM-74
6. CAN communication line LAN-4
7. Control valve with TCMTM-201
OFF vehicle8. Front brake (brake band)
TM-2209. Direct clutchTM-266
No. ItemsSymptom Condition Diagnostic ItemReference
page
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-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-244
< DISASSEMBLY AND ASSEMBLY >
DISASSEMBLY
49. Remove output speed sensor (1) from transmission case.
CAUTION:
• Do not subject it to impact by dropping or hitting it.
• Do not disassemble.
• Do not allow metal filings or any foreign material to get on
the sensor's front edge magnetic area.
• Do not place in an area affected by magnetism.
50. Remove reverse brake snap ring using two flat-bladed screw- drivers.
NOTE:
Press out snap ring from the transmission case oil pan side gap
using a flat-bladed screwdriver, and remove it using a another
screwdriver.
51. Remove reverse brake retaining plate from transmission case. • Check facing for burns, cracks or damage. If necessary,
replace the plate.
52. Remove N-spring from transmission case.
53. Remove reverse brake drive plates, driven plates and dish plate from transmission case.
•Check facing for burns, cracks or damage. If necessary,
replace the plate.
54. Remove snap ring using suitable tool.
JSDIA1321ZZ
SCIA5032E
SCIA5214E
SCIA2322E
SCIA2323E
Revision: March 2010 2008 QX56

ASSEMBLYTM-287
< DISASSEMBLY AND ASSEMBLY >
CEF
G H
I
J
K L
M A
B
TM
N
O P
d. Install O-ring to A/T assembly harness connector. CAUTION:
• Do not reuse O-ring.
• Apply ATF to O-ring.
e. Install A/T fluid temperature sensor 2 to bracket.
f. Install A/T fluid temperature sensor 2 (with bracket) to control valve with TCM and tighten bolt to specified torque.
CAUTION:
Adjust bolt hole of bracket to bolt hole of control valve.
g. Install control valve with TCM in transmission case. CAUTION:
• Make sure that turbine input speed sensor is securelyinstalled into turbine 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.
SCIA5155E
SCIA5264E
Bracket bolt : 7.9 N·m (0.81 kg-m, 70 in-lb)
SCIA5301E
1 : Brake band
JSDIA1318ZZ
Revision: March 2010 2008 QX56