2009 INFINITI QX56 brake sensor

SYSTEM SYMPTOMTM-169
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
44
Slips/Will
Not En-
gage Vehicle cannot run in
all positions.
ON vehicle1. Fluid level and state
TM-179
2. Line pressure testTM-188
3. Transmission range switch TM-44
4. Control cable adjustmentTM-195
5. Control valve with TCMTM-203
OFF vehicle6. Oil pump assembly
TM-2037. Gear systemTM-203
8. Output shaftTM-203
45With selector lever in
“D” position, driving is
not possible. ON vehicle
1. Fluid level and state
TM-179
2. Line pressure testTM-188
3. Transmission range switch TM-44
4. Control cable adjustmentTM-195
5. Control valve with TCMTM-203
OFF vehicle6. Torque converter
TM-203
7. Oil pump assembly TM-203
8. 1st one-way clutchTM-203
9. Gear systemTM-203
10. Reverse brakeTM-203
11. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
TM-8
, TM-9
TM-203
12. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to TM-8
, TM-9TM-203
46 With selector lever in
“R” position, driving is
not possible. ON vehicle
1. Fluid level and state
TM-179
2. Line pressure testTM-188
3. Transmission range switch TM-44
4. Control cable adjustmentTM-195
5. Control valve with TCMTM-203
OFF vehicle6. Gear system
TM-2037. Output shaftTM-203
8. Reverse brakeTM-203
47 OthersShift point is high in
“D” position. ON vehicle1. Output speed sensor and vehicle speed signal
TM-49
,
TM-74
2. Accelerator pedal position sensor TM-70
3. CAN communication line LAN-4
4. ATF temperature sensorTM-72
5. Control valve with TCMTM-203
No. Items Symptom Condition Diagnostic Item Reference
page
Revision: December 20092009 QX56

TM-170
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
48Others Shift point is low in “D”
position.
ON vehicle1. Output speed sensor and vehicle speed signal
TM-49
,
TM-74
2. Accelerator pedal position sensor TM-70
3. CAN communication line LAN-4
4. Control valve with TCMTM-203
49Judder occurs during
lock-up. ON vehicle1. Fluid level and state
TM-179
2. Engine speed signal TM-52
3. Input speed sensorTM-47
4. Output speed sensor and vehicle speed signalTM-49,
TM-74
5. Accelerator pedal position sensor TM-70
6. CAN communication line LAN-4
7. Torque converter clutch solenoid valveTM-64
8. Control valve with TCMTM-203
OFF vehicle 9. Torque converter TM-203
50Strange noise in “R”
position. ON vehicle
1. Fluid level and state
TM-179
2. Engine speed signal TM-52
3. CAN communication line LAN-4
4. Control valve with TCMTM-203
OFF vehicle5. Torque converter
TM-203
6. Oil pump assemblyTM-203
7. Gear systemTM-203
8. High and low reverse clutchTM-263
9. Reverse brakeTM-203
51Strange noise in “N”
position. ON vehicle
1. Fluid level and state
TM-179
2. Engine speed signal TM-52
3. CAN communication line LAN-4
4. Control valve with TCMTM-203
OFF vehicle5. Torque converter
TM-2036. Oil pump assemblyTM-203
7. Gear systemTM-203
52Strange noise in “D”
position. ON vehicle
1. Fluid level and state
TM-179
2. Engine speed signal TM-52
3. CAN communication line LAN-4
4. Control valve with TCMTM-203
OFF vehicle5. Torque converter
TM-203
6. Oil pump assemblyTM-203
7. Gear systemTM-203
8. Forward brake (Parts behind drum support is impossible to
perform inspection by disassembly. Refer to TM-8
, TM-9TM-203
No. Items Symptom Condition Diagnostic Item Reference
page
Revision: December 20092009 QX56

TM-172
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
56Others Maximum speed low.
ON vehicle
1. Fluid level and state
TM-179
2. Line pressure testTM-188
3. Accelerator pedal position sensor TM-70
4. CAN communication line LAN-4
5. Direct clutch solenoid valveTM-84
6. Control valve with TCMTM-203
OFF vehicle7. Torque converter
TM-203
8. Oil pump assemblyTM-203
9. Input clutchTM-203
10. Gear systemTM-203
11. High and low reverse clutchTM-203
12. Direct clutchTM-203
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
TM-8
, TM-9
TM-203
14 Forward brake (Parts behind drum support is impossible to
perform inspection by disassembly. Refer to TM-8
, TM-9TM-203
57 Extremely large creep. ON vehicle1. Engine idle speed
EC-172. CAN communication lineLAN-4
OFF vehicle 3. Torque converter TM-203
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-120, "In
"P" Position, Vehicle
Moves When
Pushed". ON vehicle
1. Transmission range switch
TM-44
2. Control cable adjustmentTM-195
OFF vehicle 3. Parking pawl components TM-203
59Vehicle runs with
transmission in “P” po-
sition. ON vehicle1. Transmission range switch
TM-44
2. Fluid level and stateTM-179
3. Control cable adjustmentTM-195
4. Control valve with TCMTM-203
5. Parking pawl componentsTM-203
OFF vehicle 6. Gear system TM-203
No. Items Symptom Condition Diagnostic Item Reference
page
Revision: December 20092009 QX56

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

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

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

DISASSEMBLYTM-243
< DISASSEMBLY AND ASSEMBLY >
CEF
G H
I
J
K L
M A
B
TM
N
O P
47. Remove seal rings from output shaft.
48. Remove needle bearing from transmission case.
49. Remove output speed sensor 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.
SCIA5209E
SCIA5031E
SCIA2320E
SCIA5032E
SCIA5214E
Revision: December 20092009 QX56

ASSEMBLYTM-285
< DISASSEMBLY AND ASSEMBLY >
CEF
G H
I
J
K L
M A
B
TM
N
O P
8. Make sure that brake band does not close turbine input speed sensor hole.
9. Install control valve with TCM.
a. Connect TCM connector and transmission range switch connec- tor.
b. Install A/T assembly harness connector to control valve with TCM.
c. Connect TCM connectors.
d. Install O-ring to A/T assembly harness connector. CAUTION:
 Do not reuse O-ring.
 Apply ATF to O-ring.
SCIA5449E
SCIA5450E
SCIA5447E
SCIA5155E
Revision: December 20092009 QX56