2005 INFINITI QX4 torque

TROUBLE DIAGNOSIS
AT-51
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
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

AT-52
TROUBLE DIAGNOSIS
Revision: October 20052005 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 0, "
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)SAT4 9 3G
Engine speedLine pressure [kPa (kg/cm
2 , psi)]
R position D position
At idle speed 392 - 441 (4.0 - 4.5, 57 - 64) 373 - 422 (3.8 - 4.3, 54 - 61)
At stall speed 1,700 - 1,890 (17.3 - 19.3, 247 - 274) 1,310 - 1,500 (13.3 - 15.3, 190 - 218)

AT-62
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
7
Shift
ShockShock is too large for
upshift when acceler-
ator pedal is released.ON vehicle1. Accelerator pedal position sensorAT- 1 2 3
2. Control cable adjustmentAT- 2 2 8
3. Engine speed signalAT - 11 3
4. CAN communication lineAT-9 5
5. Turbine revolution sensorAT- 1 3 1
6. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 3
7. Fluid level and stateAT-5 0
8. Control valve with TCMAT- 2 3 1
OFF vehicle9. Front brake (brake band)AT- 2 5 010. Input clutchAT- 2 8 4
11. High and low reverse clutchAT- 2 9 4
12. Direct clutchAT- 2 9 6
8Shock is too large for
lock-up.ON vehicle1. Accelerator pedal position sensorAT- 1 2 3
2. Control cable adjustmentAT- 2 2 8
3. Engine speed signalAT - 11 3
4. CAN communication lineAT-9 5
5. Turbine revolution sensorAT- 1 3 1
6. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 3
7. Torque converter clutch solenoid valveAT - 11 5
8. Fluid level and stateAT-5 0
9. Control valve with TCMAT- 2 3 1
OFF vehicle 10. Torque converterAT- 2 6 2
9Shock is too large
during engine brake.ON vehicle1. Accelerator pedal position sensorAT- 1 2 3
2. Control cable adjustmentAT- 2 2 8
3. CAN communication lineAT-9 5
4. Fluid level and stateAT-5 0
5. Control valve with TCMAT- 2 3 1
OFF vehicle6. Front brake (brake band)AT- 2 5 07. Input clutchAT- 2 8 4
8. High and low reverse clutchAT- 2 9 4
9. Direct clutchAT- 2 9 6
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-67
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
22
Slips/Will
Not
EngageWhen “D” position,
remains in 5th gear.ON vehicle1. Fluid level and stateAT- 5 0
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 3

3. ATF pressure switch 1 and front brake solenoid valveAT- 1 6 0
,
AT- 1 4 4
4. Line pressure testAT- 5 1
5. CAN communication lineAT- 9 5
6. Control valve with TCMAT- 2 3 1
OFF vehicle7. Front brake (brake band)AT- 2 6 28. Input clutchAT- 2 8 4
9. Gear systemAT- 2 5 0
10. High and low reverse clutchAT- 2 9 4
23Vehicle cannot be
started from D
1 .
Refer toAT- 1 9 2 , "
Vehi-
cle Cannot Be Started
From D1" .ON vehicle1. Fluid level and stateAT- 5 0
2. Accelerator pedal position sensorAT- 1 2 3
3. Line pressure testAT- 5 1
4. CAN communication lineAT- 9 5
5. Control valve with TCMAT- 2 3 1
OFF vehicle6. Torque converterAT- 2 6 2
7. Oil pump assemblyAT- 2 8 0
8. 3rd one-way clutchAT- 2 8 2
9. 1st one-way clutchAT- 2 8 9
10. Gear systemAT- 2 5 0
11. Reverse brakeAT- 2 6 2
12. Forward one-way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 6
, AT-1 7 .)AT- 2 6 2
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 6
, AT- 1 7
.)AT- 2 6 2
24Does not lock-up.
Refer to AT- 2 0 4 , "A/T
Does Not Perform
Lock-up" .ON vehicle1. Fluid level and stateAT- 5 0
2. Line pressure testAT- 5 1
3. Engine speed signalAT- 11 3
4. Turbine revolution sensorAT- 1 3 1
5. Torque converter clutch solenoid valveAT- 11 5
6. CAN communication lineAT- 9 5
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Torque converterAT- 2 6 29. Oil pump assemblyAT- 2 8 0
No. Items Symptom Condition Diagnostic ItemReference
page

AT-68
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
25
Slips/Will
Not
engageDoes not hold lock-up
condition.
Refer toAT- 2 0 6 , "A/T
Does Not Hold Lock-
up Condition" .ON vehicle1. Fluid level and stateAT-5 0
2. Line pressure testAT-5 1
3. Engine speed signalAT - 11 3
4. Turbine revolution sensorAT- 1 3 1
5. Torque converter clutch solenoid valveAT - 11 5
6. CAN communication lineAT-9 5
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Torque converterAT- 2 6 29. Oil pump assemblyAT- 2 8 0
26Lock-up is not
released.
Refer toAT- 2 0 8 ,
"Lock-up Is Not
Released" .ON vehicle1. Fluid level and stateAT-5 0
2. Line pressure testAT-5 1
3. Engine speed signalAT - 11 3
4. Turbine revolution sensorAT- 1 3 1
5. Torque converter clutch solenoid valveAT - 11 5
6. CAN communication lineAT-9 5
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Torque converterAT- 2 6 29. Oil pump assemblyAT- 2 8 0
27No shock at all or the
clutch slips when
vehicle changes
speed D
1 → D2 . ON vehicle1. Fluid level and stateAT-5 0
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 3
3. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 6 4,
AT- 1 4 8
4. CAN communication lineAT-9 5
5. Line pressure testAT-5 1
6. Control valve with TCMAT- 2 3 1
OFF vehicle7. Torque converterAT- 2 6 2
8. Oil pump assemblyAT- 2 8 0
9. 3rd one-way clutchAT- 2 8 2
10. Gear systemAT- 2 5 0
11. Direct clutchAT- 2 9 6
12. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT-1 6
, AT- 1 7
.)AT- 2 6 2
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-69
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
28
Slips/Will
Not
engageNo shock at all or the
clutch slips when
vehicle changes
speed D
2 → D3 .ON vehicle1. Fluid level and stateAT- 5 0
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 3
3. ATF pressure switch 6, high and low reverse clutch sole-
noid valveAT- 1 6 6,
AT- 1 5 2
4. CAN communication lineAT- 9 5
5. Line pressure testAT- 5 1
6. Control valve with TCMAT- 2 3 1
OFF vehicle7. Torque converterAT- 2 6 2
8. Oil pump assemblyAT- 2 8 0
9. 3rd one-way clutchAT- 2 8 2
10. Gear systemAT- 2 5 0
11. High and low reverse clutchAT- 2 9 4
12. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 6
, AT-1 7 .)AT- 2 6 2
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 6
, AT- 1 7
.)AT- 2 6 2
29No shock at all or the
clutch slips when
vehicle changes
speed D
3 → D4 .ON vehicle1. Fluid level and stateAT- 5 0
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 3
3. ATF pressure switch 3 and input clutch solenoid valveAT- 1 6 2,
AT- 1 4 0

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

AT-70
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
30
Slips/Will
Not
engageNo shock at all or the
clutch slips when
vehicle changes
speed D
4 → D5 .ON vehicle1. Fluid level and stateAT-5 0
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 3
3. ATF pressure switch 1 and front brake solenoid valveAT- 1 6 0,
AT- 1 4 4
4. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 6 4,
AT- 1 4 8
5. CAN communication lineAT-9 5
6. Line pressure testAT-5 1
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Torque converterAT- 2 6 2
9. Oil pump assemblyAT- 2 8 0
10. Front brake (brake band)AT- 2 6 2
11. Input clutchAT- 2 8 4
12. Gear systemAT- 2 5 0
13. High and low reverse clutchAT- 2 9 4
31When you press the
accelerator pedal and
shift speed D5 → D4
the engine idles or the
transmission slips.ON vehicle1. Fluid level and stateAT-5 0
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 3
3. ATF pressure switch 1 and front brake solenoid valveAT- 1 6 0,
AT- 1 4 4
4. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 6 4,
AT- 1 4 8
5. CAN communication lineAT-9 5
6. Line pressure testAT-5 1
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Torque converterAT- 2 6 2
9. Oil pump assemblyAT- 2 8 0
10. Input clutchAT- 2 8 4
11. Gear systemAT- 2 5 0
12. High and low reverse clutchAT- 2 9 4
13. Direct clutchAT- 2 9 6
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-71
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
32
Slips/Will
Not
engageWhen you press the
accelerator pedal and
shift speed D4 → D3
the engine idles or the
transmission slips.ON vehicle1. Fluid level and stateAT- 5 0
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 3
3. ATF pressure switch 3 and input clutch solenoid valveAT- 1 6 2,
AT- 1 4 0
4. ATF pressure switch 1 and front brake solenoid valveAT- 1 6 0,
AT- 1 4 4
5. CAN communication lineAT- 9 5
6. Line pressure testAT- 5 1
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Torque converter AT- 2 6 2
9. Oil pump assemblyAT- 2 8 0
10. 3rd one-way clutchAT- 2 8 2
11. Gear systemAT- 2 5 0
12. High and low reverse clutchAT- 2 9 4
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 6
, AT-1 7 .)AT- 2 6 2
14. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 6
, AT- 1 7
.)AT- 2 6 2
33When you press the
accelerator pedal and
shift speed D3 → D2
the engine idles or the
transmission slips.ON vehicle1. Fluid level and stateAT- 5 0
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 3
3. ATF pressure switch 6, high and low reverse clutch sole-
noid valveAT- 1 6 6,
AT- 1 5 2
4. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 6 4,
AT- 1 4 8
5. CAN communication lineAT- 9 5
6. Line pressure testAT- 5 1
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Torque converterAT- 2 6 2
9. Oil pump assemblyAT- 2 8 0
10. 3rd one-way clutchAT- 2 8 2
11. Gear systemAT- 2 5 0
12. Direct clutchAT- 2 9 6
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 6
, AT- 1 7
.)AT- 2 6 2
No. Items Symptom Condition Diagnostic ItemReference
page