2006 INFINITI QX56 clutch

TROUBLE DIAGNOSISAT-51
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Revision: November 2009 2006 QX56
Inspections Before Trouble DiagnosisECS00CEE
A/T FLUID CHECK
Fluid Leakage and Fluid Level Check

Inspect for fluid leakage and check the fluid level. Refer to AT- 1 2 , "Changing Automatic Transmission
Fluid (ATF)" .
Fluid Condition Check
Inspect the fluid condition.
STALL TEST
Stall Test Procedure
1. Inspect the amount of engine oil. Replenish the engine oil if necessary.
2. Drive for about 10 minutes to warm up the vehicle so that the A/
T fluid temperature is 50 to 80 °C (122 to 176 °F). Inspect the
amount of ATF. Replenish if necessary.
3. Securely engage the parking brake so that the tires do not turn.
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.
Fluid condition Conceivable Cause Required Operation
Varnished (viscous
varnish state) Clutch, brake
scorchedReplace the ATF and check the A/T
main unit and the vehicle for mal-
functions (wire harnesses, cooler
pipes, etc.)
Milky white or
cloudy Water in the fluidReplace the ATF and check for
places where water is getting in.
Large amount of
metal powder mixed
in Unusual wear of
sliding parts within
A/T
Replace the ATF and check for
improper operation of the A/T.
SAT638A
SAT647B
SCIA1224E
SAT514G

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-61
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Revision: November 2009 2006 QX56
Symptom ChartECS00CEN

The diagnostics item numbers show the sequence for inspection. Inspect in order from item 1.

Overhaul and inspect inside the A/T only if A/T fluid condition is NG. Refer to AT- 5 1 , "A/T FLUID
CHECK" .
No. Items Symptom Condition Diagnostic ItemReference
page
1
Shift
Shock Large shock. (
“N ” → “
D ” position)
Refer to AT-182,
"Large Shock (“N” to
“D” Position)" . ON vehicle 1. Engine idle speed
EC-76
2. Engine speed signalAT- 11 6
3. Accelerator pedal position sensorAT-124
4. Control cable adjustmentAT-227
5. ATF temperature sensorAT-127
6. ATF pressure switch 1 and front brake solenoid valveAT-159,
AT-143
7. CAN communication line AT- 9 6
8. Fluid level and stateAT- 5 1
9. Line pressure testAT- 5 2
10. Control valve with TCMAT-230
OFF vehicle11. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 7 , AT- 1 8
.) AT-264
2Shock is too large
when changing D1 →

D
2 . ON vehicle1. Accelerator pedal position sensor
AT-124
2. Control cable adjustmentAT-227
3. ATF pressure switch 5 and direct clutch solenoid valveAT-163,
AT-147
4. CAN communication line AT- 9 6
5. Engine speed signalAT- 11 6
6. Turbine revolution sensorAT-109
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT-132
8. Fluid level and state AT- 5 1
9. Control valve with TCMAT-230
OFF vehicle 10. Direct clutch AT-298
3Shock is too large
when changing D2 →

D
3 . ON vehicle1. Accelerator pedal position sensor
AT-124
2. Control cable adjustmentAT-227
3. ATF pressure switch 6, high and low reverse clutch sole-
noid valveAT-165,
AT-151
4. CAN communication line AT- 9 6
5. Engine speed signalAT- 11 6
6. Turbine revolution sensorAT-109
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT-132
8. Fluid level and state AT- 5 1
9. Control valve with TCMAT-230
OFF vehicle 10. High and low reverse clutch AT-296

AT-62
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
4
Shift
Shock Shock is too large
when changing D3
→
D
4 . ON vehicle1. Accelerator pedal position sensor
AT- 1 2 4
2. Control cable adjustmentAT- 2 2 7
3. ATF pressure switch 3 and input clutch solenoid valveAT- 1 6 1,
AT- 1 3 9
4. CAN communication line AT- 9 6
5. Engine speed signalAT- 11 6
6. Turbine revolution sensorAT- 1 0 9
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT- 1 3 2
8. Fluid level and state AT- 5 1
9. Control valve with TCMAT- 2 3 0
OFF vehicle 10. Input clutch AT- 2 8 6
5Shock is too large
when changing D4
→
D
5 . ON vehicle1. Accelerator pedal position sensor
AT- 1 2 4
2. Control cable adjustmentAT- 2 2 7
3. ATF pressure switch 1 and front brake solenoid valveAT- 1 5 9,
AT- 1 4 3

4. CAN communication line AT- 9 6
5. Engine speed signalAT- 11 6
6. Turbine revolution sensorAT- 1 0 9
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT- 1 3 2
8. Fluid level and state AT- 5 1
9. Control valve with TCMAT- 2 3 0
OFF vehicle10. Front brake (brake band)
AT- 2 5 011. Input clutchAT- 2 8 6
6Shock is too large for
downshift when accel-
erator pedal is
pressed. ON vehicle1. Accelerator pedal position sensor
AT- 1 2 4
2. Control cable adjustmentAT- 2 2 7
3. CAN communication line AT- 9 6
4. Engine speed signalAT- 11 6
5. Turbine revolution sensorAT- 1 0 9
6. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT- 1 3 2
7. Fluid level and state AT- 5 1
8. Control valve with TCMAT- 2 3 0
OFF vehicle9. Front brake (brake band)
AT- 2 5 0
10. Input clutchAT- 2 8 6
11. High and low reverse clutchAT- 2 9 6AT-
296
12. Direct clutch
AT- 2 9 8
No. ItemsSymptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSISAT-63
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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-64
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
10
No Up
Shift Gear does not change
from D
1
→ D2 .
Refer to AT-194, "
A/T
Does Not Shift: D1 →
D2" . 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 5 and direct clutch solenoid valve AT- 1 6 3,
AT- 1 4 7
4. Line pressure test AT- 5 2
5. CAN communication lineAT- 9 6
6. Control valve with TCMAT- 2 3 0
OFF vehicle 7. Direct clutch AT- 2 9 8
11Gear does not change
from D2
→ D3 .
Refer to AT-196, "
A/T
Does Not Shift: D2 →
D3" . 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 6, high and low reverse clutch sole-
noid valve AT- 1 6 5,
AT- 1 5 1
4. Line pressure test AT- 5 2
5. CAN communication lineAT- 9 6
6. Control valve with TCMAT- 2 3 0
OFF vehicle 7. High and low reverse clutch AT- 2 9 6
12Gear does not change
from D
3
→ D4 .
Refer to AT-198, "
A/T
Does Not Shift: D3 →
D4" . 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 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. Line pressure test AT- 5 2
6. CAN communication lineAT- 9 6
7. Control valve with TCMAT- 2 3 0
OFF vehicle 8. Input clutch AT- 2 8 6
13Gear does not change
from D
4
→ D5 .
Refer to AT-201, "
A/T
Does Not Shift: D4 →
D5" . 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. ATF pressure switch 5 and direct clutch solenoid valve AT- 1 6 3,
AT- 1 4 7
5. Turbine revolution sensor AT- 1 0 9
6. Line pressure test AT- 5 2
7. CAN communication lineAT- 9 6
8. Control valve with TCMAT- 2 3 0
OFF vehicle9. Front brake (brake band)
AT- 2 6 410. Input clutchAT- 2 8 6
No. ItemsSymptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSISAT-65
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Revision: November 2009 2006 QX56
14
No Down
Shift In “
D” or "4" range,
does not downshift to
4th gear.
Refer to AT-209, "A/T
Does Not Shift: 5th
gear → 4th gear" .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. Front brake (brake band)
AT-2649. Input clutchAT-286
15In “
D” or "3" range,
does not downshift to
3rd gear.
Refer to AT-212, "A/T
Does Not Shift: 4th
gear → 3rd gear" . 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 3 and input clutch solenoid valve AT-161,
AT-139
4. ATF pressure switch 1 and front brake solenoid valve AT-159,
AT-143
5. CAN communication line AT- 9 6
6. Line pressure testAT- 5 2
7. Control valve with TCMAT-230
OFF vehicle 8. Input clutch AT-286
16In “
D” or "2" range,
does not downshift to
2nd gear.
Refer to AT-213, "A/T
Does Not Shift: 3rd
gear → 2nd gear" .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 6, high and low reverse clutch sole-
noid valve AT-165
,
AT-151
4. CAN communication line AT- 9 6
5. Line pressure testAT- 5 2
6. Control valve with TCMAT-230
OFF vehicle 7. High and low reverse clutch AT-296
17In “
D” or "1" range,
does not downshift to
1st gear.
Refer to AT-215, "A/T
Does Not Shift: 2nd
gear → 1st gear" . 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 vehicle 7. Direct clutch AT-298
No. ItemsSymptom Condition Diagnostic ItemReference
page

AT-66
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
18
Slips/Will
Not
engage When
“D ” position,
remains in 1st gear. 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. Direct clutch solenoid valve AT- 1 4 7
4. Line pressure test AT- 5 2
5. CAN communication lineAT- 9 6
6. Control valve with TCMAT- 2 3 0
OFF vehicle7.
AT- 2 8 4
3rd one-way clutch AT- 2 8 4
8. 1st one-way clutch AT- 2 9 1
9. Gear systemAT- 2 5 0
10. Reverse brakeAT- 2 6 4
11. 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
12. 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
19
When
“D ” position,
remains in 2nd gear. ON vehicle
1. Fluid level and state
AT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTR
AT- 111 ,
AT-132
3. Low coast brake solenoid valve AT- 1 5 5
4. Line pressure test AT- 5 2
5. CAN communication lineAT- 9 6
6. Control valve with TCMAT- 2 3 0
OFF vehicle7. 3rd one-way clutch
AT- 2 8 4
8. Gear systemAT- 2 5 0
9. Direct clutchAT- 2 9 8
10. 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