2006 INFINITI QX56 torque

AT-52
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
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
LINE PRESSURE TEST
Line Pressure Test Port
Line Pressure Test Procedure
1. Inspect the amount of engine oil and replenish if necessary.
2. Drive the car for about 10 minutes to warm it up so that the ATF reaches in range of 50 to 80 °C (122 to
176° F), then inspect the amount of ATF and replenish if necessary.
NOTE:
The automatic fluid temperature rises in range of 50 to 80 °C (122 to 176 °F) during 10 minutes of
driving. Stall speed: 2,500 - 2,800 rpm
Selector lever position
Expected problem location
DR
Stall rotation HO

Forward brake

Forward one-way clutch

1st one-way clutch

3rd one-way clutch
OH

Reverse brake
LL

Engine and torque converter one-way clutch
HH

Line pressure low
Does not shift-up D position 1 → 2 Slipping in 2nd, 3rd, 4th gears Direct clutch slippage
Does not shift-up D position 2 → 3 Slipping in 3rd, 4th, 5th gears High and low reverse clutch slippage
Does not shift-up D position 3 → 4 Slipping in 4th, 5th gears Input clutch slippage
Does not shift-up D position 4 → 5 Slipping in 5th gear Front brake slippage
SCIA2187E

TROUBLE DIAGNOSISAT-53
DE
F
G H
I
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K L
M A
B
AT
Revision: November 2009 2006 QX56
3. After warming up remove the oil pressure detection plug and
install the oil pressure gauge [ST2505S001(J-34301-C)].
CAUTION:
When using the oil pressure gauge, be sure to use the O-
ring attached to the oil pressure detection plug.
4. Securely engage the parking brake so that the tires do not turn.
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 pressure at the stall speed,
refer to AT- 5 1 , "
STALL TEST" .
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
SCIA5309E
SCIA1224E
:7.3 N·m (0.74 kg-m, 65 in-lb)SAT493G
Engine speed Line pressure [kPa (kg/cm2 , 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)

TROUBLE DIAGNOSISAT-63
DE
F
G H
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K L
M A
B
AT
Revision: November 2009 2006 QX56
7
Shift
Shock Shock is too large for
upshift when acceler-
ator pedal is released.
ON vehicle1. Accelerator pedal position sensor
AT-124
2. Control cable adjustmentAT-227
3. Engine speed signal AT- 11 6
4. CAN communication line AT- 9 6
5. Turbine revolution sensorAT-109
6. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT-132
7. Fluid level and state AT- 5 1
8. Control valve with TCMAT-230
OFF vehicle9. Front brake (brake band)
AT-25010. Input clutchAT-286
11. High and low reverse clutchAT-296
12. Direct clutchAT-298
8Shock is too large for
lock-up. ON vehicle1. Accelerator pedal position sensor
AT-124
2. Control cable adjustmentAT-227
3. Engine speed signal AT- 11 6
4. CAN communication line AT- 9 6
5. Turbine revolution sensorAT-109
6. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT-132
7. Torque converter clutch solenoid valve AT- 11 8
8. Fluid level and state AT- 5 1
9. Control valve with TCMAT-230
OFF vehicle 10. Torque converter AT-264
9Shock is too large
during engine brake. ON vehicle
1. Accelerator pedal position sensor
AT-124
2. Control cable adjustmentAT-227
3. CAN communication line AT- 9 6
4. Fluid level and stateAT- 5 1
5. Control valve with TCMAT-230
OFF vehicle6. Front brake (brake band)
AT-2507. Input clutchAT-286
8. High and low reverse clutchAT-296
9. Direct clutchAT-298
No. ItemsSymptom Condition Diagnostic ItemReference
page

AT-68
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
22
Slips/Will
Not
Engage When
“D ” position,
remains in 5th gear. ON vehicle1. Fluid level and state
AT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT- 1 3 2

3. ATF pressure switch 1 and front brake solenoid valve AT- 1 5 9
,
AT- 1 4 3
4. Line pressure test AT- 5 2
5. CAN communication lineAT- 9 6
6. Control valve with TCMAT- 2 3 0
OFF vehicle7. Front brake (brake band)
AT- 2 6 48. Input clutchAT- 2 8 6
9. Gear systemAT- 2 5 0
10. High and low reverse clutchAT- 2 9 6
23Vehicle cannot be
started from D
1 .
Refer to AT-191, "
Vehi-
cle Cannot Be Started
From D1" . ON vehicle
1. Fluid level and state
AT- 5 1
2. Accelerator pedal position sensorAT- 1 2 4
3. Line pressure test AT- 5 2
4. CAN communication lineAT- 9 6
5. Control valve with TCMAT- 2 3 0
OFF vehicle6. Torque converter
AT- 2 6 4
7. Oil pump assemblyAT- 2 8 2
8. 3rd one-way clutchAT- 2 8 4
9. 1st one-way clutchAT- 2 9 1
10. Gear systemAT- 2 5 0
11. Reverse brakeAT- 2 6 4
12. Forward one-way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8 .) AT- 2 6 4
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8
.) AT- 2 6 4
24Does not lock-up.
Refer to
AT-203, "A/T
Does Not Perform
Lock-up" . ON vehicle1. Fluid level and state
AT- 5 1
2. Line pressure testAT- 5 2
3. Engine speed signalAT- 11 6
4. Turbine revolution sensorAT- 1 0 9
5. Torque converter clutch solenoid valve AT- 11 8
6. CAN communication line AT- 9 6
7. Control valve with TCMAT- 2 3 0
OFF vehicle8. Torque converter
AT- 2 6 49. Oil pump assemblyAT- 2 8 2
No. ItemsSymptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSISAT-69
DE
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G H
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M A
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AT
Revision: November 2009 2006 QX5625
Slips/Will
Not
engage Does not hold lock-up
condition.
Refer to
AT-205, "A/T
Does Not Hold Lock-
up Condition" . ON vehicle 1. Fluid level and state
AT- 5 1
2. Line pressure testAT- 5 2
3. Engine speed signalAT- 11 6
4. Turbine revolution sensorAT-109
5. Torque converter clutch solenoid valve AT- 11 8
6. CAN communication line AT- 9 6
7. Control valve with TCMAT-230
OFF vehicle8. Torque converter
AT-2649. Oil pump assemblyAT-282
26Lock-up is not
released.
Refer to
AT-207,
"Lock-up Is Not
Released" . ON vehicle1. Fluid level and state
AT- 5 1
2. Line pressure testAT- 5 2
3. Engine speed signalAT- 11 6
4. Turbine revolution sensorAT-109
5. Torque converter clutch solenoid valve AT- 11 8
6. CAN communication line AT- 9 6
7. Control valve with TCMAT-230
OFF vehicle8. Torque converter
AT-2649. Oil pump assemblyAT-282
27No shock at all or the
clutch slips when
vehicle changes
speed D
1 →
D2 . ON vehicle
1. Fluid level and state
AT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT-132
3. ATF pressure switch 5 and direct clutch solenoid valve AT-163,
AT-147
4. CAN communication line AT- 9 6
5. Line pressure testAT- 5 2
6. Control valve with TCMAT-230
OFF vehicle7. Torque converter
AT-264
8. Oil pump assemblyAT-282
9. 3rd one-way clutchAT-284
10. Gear systemAT-250
11. Direct clutchAT-298
12. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 7
, AT- 1 8
.) AT-264
No. Items
Symptom Condition Diagnostic ItemReference
page

AT-70
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
28
Slips/Will
Not
engage No shock at all or the
clutch slips when
vehicle changes
speed D
2
→ D3 . ON vehicle
1. Fluid level and state
AT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT- 1 3 2
3. ATF pressure switch 6, high and low reverse clutch sole-
noid valve AT- 1 6 5,
AT- 1 5 1
4. CAN communication line AT- 9 6
5. Line pressure testAT- 5 2
6. Control valve with TCMAT- 2 3 0
OFF vehicle7. Torque converter
AT- 2 6 4
8. Oil pump assemblyAT- 2 8 2
9. 3rd one-way clutchAT- 2 8 4
10. Gear systemAT- 2 5 0
11. High and low reverse clutchAT- 2 9 6
12. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8 .) AT- 2 6 4
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8
.) AT- 2 6 4
29No shock at all or the
clutch slips when
vehicle changes
speed D
3
→ D4 . ON vehicle 1. Fluid level and state
AT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT- 1 3 2
3. ATF pressure switch 3 and input clutch solenoid valve AT- 1 6 1,
AT- 1 3 9

4. ATF pressure switch 1 and front brake solenoid valve AT- 1 5 9
,
AT- 1 4 3
5. CAN communication line AT- 9 6
6. Line pressure testAT- 5 2
7. Control valve with TCMAT- 2 3 0
OFF vehicle8. Torque converter
AT- 2 6 4
9. Oil pump assemblyAT- 2 8 2
10. Input clutchAT- 2 8 6
11. Gear systemAT- 2 5 0
12. High and low reverse clutchAT- 2 9 6
13. Direct clutchAT- 2 9 8
No. ItemsSymptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSISAT-71
DE
F
G H
I
J
K L
M A
B
AT
Revision: November 2009 2006 QX56
30
Slips/Will
Not
engage No shock at all or the
clutch slips when
vehicle changes
speed D
4 →
D5 . ON vehicle 1. Fluid level and state
AT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT-132
3. ATF pressure switch 1 and front brake solenoid valve AT-159,
AT-143
4. ATF pressure switch 5 and direct clutch solenoid valve AT-163,
AT-147
5. CAN communication line AT- 9 6
6. Line pressure testAT- 5 2
7. Control valve with TCMAT-230
OFF vehicle8. Torque converter
AT-264
9. Oil pump assemblyAT-282
10. Front brake (brake band)AT-264
11. Input clutchAT-286
12. Gear systemAT-250
13. High and low reverse clutchAT-296
31When you press the
accelerator pedal and
shift speed D5 →
D4
the engine idles or the
transmission slips. ON vehicle
1. Fluid level and state
AT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT-132
3. ATF pressure switch 1 and front brake solenoid valve AT-159,
AT-143
4. ATF pressure switch 5 and direct clutch solenoid valve AT-163,
AT-147
5. CAN communication line AT- 9 6
6. Line pressure testAT- 5 2
7. Control valve with TCMAT-230
OFF vehicle8. Torque converter
AT-264
9. Oil pump assemblyAT-282
10. Input clutchAT-286
11. Gear systemAT-250
12. High and low reverse clutchAT-296
13. Direct clutchAT-298
No. ItemsSymptom Condition Diagnostic ItemReference
page

AT-72
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
32
Slips/Will
Not
engage When you press the
accelerator pedal and
shift speed D4
→ D3
the engine idles or the
transmission slips. ON vehicle
1. Fluid level and state
AT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT- 1 3 2
3. ATF pressure switch 3 and input clutch solenoid valve AT- 1 6 1,
AT- 1 3 9
4. ATF pressure switch 1 and front brake solenoid valve AT- 1 5 9,
AT- 1 4 3
5. CAN communication line AT- 9 6
6. Line pressure testAT- 5 2
7. Control valve with TCMAT- 2 3 0
OFF vehicle8. Torque converter
AT- 2 6 4
9. Oil pump assemblyAT- 2 8 2
10. 3rd one-way clutchAT- 2 8 4
11. Gear systemAT- 2 5 0
12. High and low reverse clutchAT- 2 9 6
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8 .) AT- 2 6 4
14. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8
.) AT- 2 6 4
33When you press the
accelerator pedal and
shift speed D3
→ D2
the engine idles or the
transmission slips. ON vehicle
1. Fluid level and state
AT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT- 1 3 2
3. ATF pressure switch 6, high and low reverse clutch sole-
noid valve AT- 1 6 5,
AT- 1 5 1
4. ATF pressure switch 5 and direct clutch solenoid valve AT- 1 6 3,
AT- 1 4 7
5. CAN communication line AT- 9 6
6. Line pressure testAT- 5 2
7. Control valve with TCMAT- 2 3 0
OFF vehicle8. Torque converter
AT- 2 6 4
9. Oil pump assemblyAT- 2 8 2
10. 3rd one-way clutchAT- 2 8 4
11. Gear systemAT- 2 5 0
12. Direct clutchAT- 2 9 8
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 7
, AT- 1 8
.) AT- 2 6 4
No. Items
Symptom Condition Diagnostic ItemReference
page