2007 INFINITI QX56 Factory Service Manual

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Page 129 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS
AT-59
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
AT
N
O
P
• Refer to AT-59, "Vehicle Speed When Shifting Gears".
With CONSULT-II
Read the gear position, throttle position and

TROUBLE DIAGNOSIS
AT-59
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
AT
N
O
P
• Refer to AT-59, "Vehicle Speed When Shifting Gears".
With CONSULT-II
Read the gear position, throttle position and vehicle speed.
Does the A/T shift-up D2
→ D3 at the correct speed?
YES >> GO TO 4.
NO >> Enter a check mark at “Vehicle Does Not Shift: D2 → D3” on the diagnostics worksheet, then con-
tinue the road test.
4.CHECK SHIFT-UP D3 → D4 AND ENGINE BRAKE
When the transmission changes speed D3 → D4, return the accelerator pedal.
Does the A/T shift-up D3
→ D4 and apply the engine brake?
YES >> 1. Stop the vehicle.
2. See AT-59, "
Cruise Test - Part 3".
NO >> Enter a check mark at “Vehicle Does Not Shift: D3 → D4” on the diagnostics worksheet, then con-
tinue the road test.
Cruise Test - Part 3INFOID:0000000003532253
1.CHECK SHIFT-DOWN
During D
5 driving, move gear selector from D → 4 → 3 → 2 → 1.
With CONSULT-II
Read the gear position.
Is downshifting correctly performed?
YES >> GO TO 2.
NO >> Enter a check mark at “Vehicle does not shift” at the corresponding position (5th → 4th, 4th → 3rd,
3rd → 2nd, 2nd → 1st) on the diagnostics worksheet, then continue the road test.
2.CHECK ENGINE BRAKE
Does engine braking effectively reduce speed in 1
1 position?
YES >> 1. Stop the vehicle.
2. Carry out the self-diagnostics. Refer to AT-83, "
CONSULT-II Function (A/T)".
NO >> Enter a check mark at “Vehicle Does Not Decelerate By Engine Brake” on the diagnostics work-
sheet, then continue trouble diagnosis.
Vehicle Speed When Shifting GearsINFOID:0000000003532254
NORMAL MODE
• At half throttle, the accelerator opening is 4/8 of the full opening.
TOW MODE
Final
gear
ratioThrottle positionVehicle speed km/h (MPH)
D
1 →D2D2 →D3D3 →D4D4 →D5D5 →D4D4 →D3D3 →D2D2 →D1
2.937Full throttle 70 - 74
(44 - 46)112 - 120
(70 - 75)176 - 186
(110 - 116)249 - 259
(155 - 161)245 - 255
(152 - 159)166 - 176
(103 - 110)100 - 108
(62 - 67)43 - 47
(27 - 30)
Half throttle 46 - 50
(28 - 31)74 - 82
(46 - 51)103 - 113
(64 - 70)135 - 145
(84 - 90)109 - 119
(68 - 74)69 - 79
(43 - 49)44 - 52
(27 - 32)11 - 1 5
(7 - 10)
3.357Full throttle 61 - 65
(38 - 41)97 - 105
(61 - 66)153 - 163
(95 - 102)236 - 246
(147 - 153)232 - 242
(144 - 151)143 - 153
(89 - 95)87 - 95
(54 - 59)43 - 47
(27 - 29)
Half throttle 41 - 45
(26 - 28)66 - 74
(41 - 46)89 - 99
(56 - 62)11 7 - 1 2 7
(73 - 79)95 - 105
(59 - 65)59 - 69
(37 - 43)38 - 46
(24 - 29)11 - 1 5
(7 - 10)
Final
gear
ratioThrottle positionVehicle speed km/h (MPH)
D
1 →D2D2 →D3D3 →D4D4 →D5D5 →D4D4 →D3D3 →D2D2 →D1

Page 130 of 3061

INFINITI QX56 2007 Factory Service Manual AT-60
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
• At half throttle, the accelerator opening is 4/8 of the full opening.
Vehicle Speed When Performing and Releasing Complete Lock-upINFOID:00000000035

AT-60
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
• At half throttle, the accelerator opening is 4/8 of the full opening.
Vehicle Speed When Performing and Releasing Complete Lock-upINFOID:0000000003532255
• At closed throttle, the accelerator opening is less than 1/8 condition.
• At half throttle, the accelerator opening is 4/8 of the full opening.
Vehicle Speed When Performing and Releasing Slip Lock-upINFOID:0000000003532256
• At closed throttle, the accelerator opening is less than 1/8 condition.
Symptom ChartINFOID:0000000003532257
•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-51, "
Inspections
Before Trouble Diagnosis".
2.937Full throttle 70 - 74
(44 - 46)112 - 120
(70 - 75)176 - 186
(110 - 116)249 - 259
(155 - 161)245 - 255
(152 - 159)166 - 176
(103 - 110)100 - 108
(62 - 67)43 - 47
(27 - 30)
Half throttle 50 - 54
(31 - 34)81 - 89
(50 - 55)113 - 123
(70 - 76)135 - 145
(84 - 90)109 - 119
(68 - 74)68 - 78
(42 - 48)44 - 52
(27 - 32)11 - 1 5
(7 - 10)
3.357Full throttle 61 - 65
(38 - 41)97 - 105
(61 - 66)153 - 163
(95 - 102)236 - 246
(147 - 153)232 - 242
(144 - 151)143 - 153
(89 - 95)87 - 95
(54 - 59)43 - 47
(27 - 29)
Half throttle 43 - 47
(27 - 29)72 - 80
(45 - 50)98 - 108
(61 - 67)117 - 127
(73 - 79)95 - 105
(59 - 65)59 - 69
(37 - 43)37 - 45
(23 - 28)11 - 1 5
(7 - 10)
Final
gear
ratioThrottle positionVehicle speed km/h (MPH)
Lock-up “ON” Lock-up “OFF”
2.937Closed throttle 74 - 82 (46 - 51) 71 - 79 (45 - 49)
Half throttle 188 - 196 (117 - 122) 136 - 144 (85 - 90)
3.357Closed throttle 65 - 73 (41 - 46) 62 - 70 (39 - 44)
Half throttle 168 - 176 (105 - 110) 118 - 126 (74 - 79)
Final
gear
ratioThrottle position Gear positionVehicle speed km/h (MPH)
Slip lock-up “ON” Slip lock-up “OFF”
2.937 Closed throttle4th 52 - 60 (33 - 38) 49 - 57 (31 - 36)
5th 52 - 60 (33 - 38) 49 - 57 (31 - 36)
3.357 Closed throttle4th 46 - 54 (29 - 34) 43 - 51 (27 - 32)
5th 46 - 54 (29 - 34) 43 - 51 (27 - 32)

Page 131 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS
AT-61
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
AT
N
O
P
No. Items Symptom Condition Diagnostic ItemReference
page
1
Shift
ShockLarge shock. (“N” →“
D” position)
Re

Page 132 of 3061

INFINITI QX56 2007 Factory Service Manual AT-62
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
4
Shift
ShockShock is too large
when changing D3 →
D
4.ON vehicle1. Accelerator pedal position sensorAT- 11 7
2. Control cable adjustmentAT- 2 0 8

Page 133 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS
AT-63
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
AT
N
O
P
7
Shift
ShockShock is too large for
upshift when accelera-
tor pedal is released.ON vehicle1. Accelerator pedal positi

Page 134 of 3061

INFINITI QX56 2007 Factory Service Manual AT-64
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
10
No Up
ShiftGear does not change
from D → D
2.
Refer to AT-179, "
A/T
Does Not Shift: D1→
D2".ON vehicle1. Fluid level and stateAT- 5 1
2. Veh

AT-64
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
10
No Up
ShiftGear does not change
from D → D
2.
Refer to AT-179, "
A/T
Does Not Shift: D1→
D2".ON vehicle1. Fluid level and stateAT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5,
AT- 1 2 4
3. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 5 4,
AT- 1 3 8
4. Line pressure testAT- 5 1
5. CAN communication lineAT- 9 1
6. Control valve with TCMAT- 2 1 0
OFF vehicle 7. Direct clutchAT- 2 7 4
11Gear does not change
from D → D3.
Refer to AT-181, "
A/T
Does Not Shift: D2→
D3".ON vehicle1. Fluid level and stateAT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5,
AT- 1 2 4
3. ATF pressure switch 6, high and low reverse clutch sole-
noid valveAT- 1 5 6,
AT- 1 4 2
4. Line pressure testAT- 5 1
5. CAN communication lineAT- 9 1
6. Control valve with TCMAT- 2 1 0
OFF vehicle 7. High and low reverse clutchAT- 2 7 2
12Gear does not change
from D → D
4.
Refer to AT-183, "
A/T
Does Not Shift: D3→
D4".ON vehicle1. Fluid level and stateAT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5,
AT- 1 2 4
3. ATF pressure switch 3 and input clutch solenoid valveAT- 1 5 2,
AT- 1 3 0
4. ATF pressure switch 1 and front brake solenoid valveAT- 1 5 0,
AT- 1 3 4
5. Line pressure testAT- 5 1
6. CAN communication lineAT- 9 1
7. Control valve with TCMAT- 2 1 0
OFF vehicle 8. Input clutchAT- 2 6 2
13Gear does not change
from D → D
5.
Refer to AT-185, "
A/T
Does Not Shift: D4→
D5".ON vehicle1. Fluid level and stateAT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5,
AT- 1 2 4
3. ATF pressure switch 1 and front brake solenoid valveAT- 1 5 0,
AT- 1 3 4
4. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 5 4,
AT- 1 3 8
5. Turbine revolution sensorAT- 1 0 3
6. Line pressure testAT- 5 1
7. CAN communication lineAT- 9 1
8. Control valve with TCMAT- 2 1 0
OFF vehicle9. Front brake (brake band)AT- 2 4 010. Input clutchAT- 2 6 2
No. Items Symptom Condition Diagnostic ItemReference
page

Page 135 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS
AT-65
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
AT
N
O
P
14
No Down
ShiftIn “D” or "4" range,
does not downshift to
4th gear.
Refer to AT- 1 9 2 , "A/T
Does Not Shift:

TROUBLE DIAGNOSIS
AT-65
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
AT
N
O
P
14
No Down
ShiftIn “D” or "4" range,
does not downshift to
4th gear.
Refer to AT- 1 9 2 , "A/T
Does Not Shift: 5th
gear → 4th gear".ON vehicle1. Fluid level and stateAT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5,
AT-124

3. ATF pressure switch 1 and front brake solenoid valveAT- 1 5 0
,
AT-134
4. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 5 4,
AT-138
5. CAN communication lineAT- 9 1
6. Line pressure testAT- 5 1
7. Control valve with TCMAT-210
OFF vehicle8. Front brake (brake band)AT-2409. Input clutchAT-262
15In “D” or "3" range,
does not downshift to
3rd gear.
Refer to AT- 1 9 4 , "A/T
Does Not Shift: 4th
gear → 3rd gear".ON vehicle1. Fluid level and stateAT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5,
AT-124
3. ATF pressure switch 3 and input clutch solenoid valveAT- 1 5 2,
AT-130
4. ATF pressure switch 1 and front brake solenoid valveAT- 1 5 0,
AT-134
5. CAN communication lineAT- 9 1
6. Line pressure testAT- 5 1
7. Control valve with TCMAT-210
OFF vehicle 8. Input clutchAT-262
16In “D” or "2" range,
does not downshift to
2nd gear.
Refer to AT- 1 9 6 , "A/T
Does Not Shift: 3rd
gear → 2nd gear".ON vehicle1. Fluid level and stateAT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5,
AT-124

3. ATF pressure switch 6, high and low reverse clutch sole-
noid valveAT- 1 5 6
,
AT-142
4. CAN communication lineAT- 9 1
5. Line pressure testAT- 5 1
6. Control valve with TCMAT-210
OFF vehicle 7. High and low reverse clutchAT-272
17In “D” or "1" range,
does not downshift to
1st gear.
Refer to AT- 1 9 7 , "A/T
Does Not Shift: 2nd
gear → 1st gear".ON vehicle1. Fluid level and stateAT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5,
AT-124
3. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 5 4,
AT-138
4. CAN communication lineAT- 9 1
5. Line pressure testAT- 5 1
6. Control valve with TCMAT-210
OFF vehicle 7. Direct clutchAT-274
No. Items Symptom Condition Diagnostic ItemReference
page

Page 136 of 3061

INFINITI QX56 2007 Factory Service Manual AT-66
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
18
Slips/Will
Not en-
gageWhen “D” position, re-
mains in 1st gear.ON vehicle1. Fluid level and stateAT- 5 1
2. Vehicle speed sensor A/T and vehicl

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