engine INFINITI QX56 2007 Factory Workshop Manual

TROUBLE DIAGNOSIS
AT-59
< SERVICE INFORMATION >
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• 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

TROUBLE DIAGNOSIS
AT-61
< SERVICE INFORMATION >
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No. Items Symptom Condition Diagnostic ItemReference
page
1
Shift
ShockLarge shock. (“N” →“
D” position)
Refer to AT- 1 7 0 ,
"Large Shock ("N" to
"D" Position)".ON vehicle1. Engine idle speedEC-75
2. Engine speed signalAT-109
3. Accelerator pedal position sensorAT- 11 7
4. Control cable adjustmentAT-208
5. ATF temperature sensorAT- 11 9
6. ATF pressure switch 1 and front brake solenoid valveAT- 1 5 0,
AT-134
7. CAN communication lineAT- 9 1
8. Fluid level and stateAT- 5 1
9. Line pressure testAT- 5 1
10. Control valve with TCMAT-210
OFF vehicle11. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 9, AT- 2 0.)AT-240
2Shock is too large
when changing D1 →
D
2.ON vehicle1. Accelerator pedal position sensorAT- 11 7
2. Control cable adjustmentAT-208
3. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 5 4,
AT-138
4. CAN communication lineAT- 9 1
5. Engine speed signalAT-109
6. Turbine revolution sensorAT-103
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5,
AT-124
8. Fluid level and stateAT- 5 1
9. Control valve with TCMAT-210
OFF vehicle 10. Direct clutchAT-274
3Shock is too large
when changing D2 →
D
3.ON vehicle1. Accelerator pedal position sensorAT- 11 7
2. Control cable adjustmentAT-208
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. Engine speed signalAT-109
6. Turbine revolution sensorAT-103
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5,
AT-124
8. Fluid level and stateAT- 5 1
9. Control valve with TCMAT-210
OFF vehicle 10. High and low reverse clutchAT-272

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

4. CAN communication lineAT- 9 1
5. Engine speed signalAT- 1 0 9
6. Turbine revolution sensorAT- 1 0 3
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5,
AT- 1 2 4
8. Fluid level and stateAT- 5 1
9. Control valve with TCMAT- 2 1 0
OFF vehicle10. Front brake (brake band)AT- 2 2 811. Input clutchAT- 2 6 2
6Shock is too large for
downshift when accel-
erator pedal is
pressed.ON vehicle1. Accelerator pedal position sensorAT- 11 7
2. Control cable adjustmentAT- 2 0 8
3. CAN communication lineAT- 9 1
4. Engine speed signalAT- 1 0 9
5. Turbine revolution sensorAT- 1 0 3
6. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5,
AT- 1 2 4
7. Fluid level and stateAT- 5 1
8. Control valve with TCMAT- 2 1 0
OFF vehicle9. Front brake (brake band)AT- 2 2 8
10. Input clutchAT- 2 6 2
11. High and low reverse clutchAT- 2 7 2AT-
272
12. Direct clutchAT- 2 7 4
No. Items Symptom Condition Diagnostic ItemReference
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TROUBLE DIAGNOSIS
AT-63
< SERVICE INFORMATION >
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7
Shift
ShockShock is too large for
upshift when accelera-
tor pedal is released.ON vehicle1. Accelerator pedal position sensorAT- 11 7
2. Control cable adjustmentAT-208
3. Engine speed signalAT-109
4. CAN communication lineAT- 9 1
5. Turbine revolution sensorAT-103
6. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5,
AT-124
7. Fluid level and stateAT- 5 1
8. Control valve with TCMAT-210
OFF vehicle9. Front brake (brake band)AT-22810. Input clutchAT-262
11. High and low reverse clutchAT-272
12. Direct clutchAT-274
8Shock is too large for
lock-up.ON vehicle1. Accelerator pedal position sensorAT- 11 7
2. Control cable adjustmentAT-208
3. Engine speed signalAT-109
4. CAN communication lineAT- 9 1
5. Turbine revolution sensorAT-103
6. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5,
AT-124
7. Torque converter clutch solenoid valveAT- 111
8. Fluid level and stateAT- 5 1
9. Control valve with TCMAT-210
OFF vehicle 10. Torque converterAT-240
9Shock is too large dur-
ing engine brake.ON vehicle1. Accelerator pedal position sensorAT- 11 7
2. Control cable adjustmentAT-208
3. CAN communication lineAT- 9 1
4. Fluid level and stateAT- 5 1
5. Control valve with TCMAT-210
OFF vehicle6. Front brake (brake band)AT-2287. Input clutchAT-262
8. High and low reverse clutchAT-272
9. Direct clutchAT-274
No. Items Symptom Condition Diagnostic ItemReference
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AT-68
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
22
Slips/Will
Not En-
gageWhen “D” position, re-
mains in 5th gear.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. Line pressure testAT- 5 1
5. CAN communication lineAT- 9 1
6. Control valve with TCMAT- 2 1 0
OFF vehicle7. Front brake (brake band)AT- 2 4 08. Input clutchAT- 2 6 2
9. Gear systemAT- 2 2 8
10. High and low reverse clutchAT- 2 7 2
23Vehicle cannot be
started from D
1.
Refer to AT-177, "
Ve -
hicle Cannot Be Start-
ed from D1".ON vehicle1. Fluid level and stateAT- 5 1
2. Accelerator pedal position sensorAT- 11 7
3. Line pressure testAT- 5 1
4. CAN communication lineAT- 9 1
5. Control valve with TCMAT- 2 1 0
OFF vehicle6. Torque converterAT- 2 4 0
7. Oil pump assemblyAT- 2 5 8
8. 3rd one-way clutchAT- 2 6 0
9. 1st one-way clutchAT- 2 6 7
10. Gear systemAT- 2 2 8
11. Reverse brakeAT- 2 4 0
12. Forward one-way clutch (Parts behind drum support is im-
possible to perform inspection by disassembly. Refer to AT-
19, AT- 2 0.)AT- 2 4 0
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 9
, AT- 2 0.)AT- 2 4 0
24Does not lock-up.
Refer to AT-187, "A/T
Does Not Perform
Lock-up".ON vehicle1. Fluid level and stateAT- 5 1
2. Line pressure testAT- 5 1
3. Engine speed signalAT- 1 0 9
4. Turbine revolution sensorAT- 1 0 3
5. Torque converter clutch solenoid valveAT- 111
6. CAN communication lineAT- 9 1
7. Control valve with TCMAT- 2 1 0
OFF vehicle8. Torque converterAT- 2 4 09. Oil pump assemblyAT- 2 5 8
No. Items Symptom Condition Diagnostic ItemReference
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TROUBLE DIAGNOSIS
AT-69
< SERVICE INFORMATION >
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Slips/Will
Not en-
gageDoes not hold lock-up
condition.
Refer to AT- 1 8 9 , "A/T
Does Not Hold Lock-
up Condition".ON vehicle1. Fluid level and stateAT- 5 1
2. Line pressure testAT- 5 1
3. Engine speed signalAT-109
4. Turbine revolution sensorAT-103
5. Torque converter clutch solenoid valveAT- 111
6. CAN communication lineAT- 9 1
7. Control valve with TCMAT-210
OFF vehicle8. Torque converterAT-2409. Oil pump assemblyAT-258
26Lock-up is not re-
leased.
Refer to AT- 1 9 0 ,
"Lock-up Is Not Re-
leased".ON vehicle1. Fluid level and stateAT- 5 1
2. Line pressure testAT- 5 1
3. Engine speed signalAT-109
4. Turbine revolution sensorAT-103
5. Torque converter clutch solenoid valveAT- 111
6. CAN communication lineAT- 9 1
7. Control valve with TCMAT-210
OFF vehicle8. Torque converterAT-2409. Oil pump assemblyAT-258
27No shock at all or the
clutch slips when vehi-
cle changes speed D1
→ D
2. 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 vehicle7. Torque converterAT-240
8. Oil pump assemblyAT-258
9. 3rd one-way clutchAT-260
10. Gear systemAT-228
11. Direct clutchAT-274
12. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 9
, AT- 2 0.)AT-240
No. Items Symptom Condition Diagnostic ItemReference
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TROUBLE DIAGNOSIS
AT-71
< SERVICE INFORMATION >
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30
Slips/Will
Not en-
gageNo shock at all or the
clutch slips when vehi-
cle changes speed D4
→ D
5.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. Torque converterAT-240
9. Oil pump assemblyAT-258
10. Front brake (brake band)AT-240
11. Input clutchAT-262
12. Gear systemAT-228
13. High and low reverse clutchAT-272
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 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. Torque converterAT-240
9. Oil pump assemblyAT-258
10. Input clutchAT-262
11. Gear systemAT-228
12. High and low reverse clutchAT-272
13. Direct clutchAT-274
No. Items Symptom Condition Diagnostic ItemReference
page

AT-72
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
32
Slips/Will
Not en-
gageWhen you press the
accelerator pedal and
shift speed D4 → D3
the engine idles or the
transmission slips.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. CAN communication lineAT- 9 1
6. Line pressure testAT- 5 1
7. Control valve with TCMAT- 2 1 0
OFF vehicle8. Torque converter AT- 2 4 0
9. Oil pump assemblyAT- 2 5 8
10. 3rd one-way clutchAT- 2 6 0
11. Gear systemAT- 2 2 8
12. High and low reverse clutchAT- 2 7 2
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to AT-
19, AT- 2 0.)AT- 2 4 0
14. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 9
, AT- 2 0.)AT- 2 4 0
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 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. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 5 4,
AT- 1 3 8
5. CAN communication lineAT- 9 1
6. Line pressure testAT- 5 1
7. Control valve with TCMAT- 2 1 0
OFF vehicle8. Torque converterAT- 2 4 0
9. Oil pump assemblyAT- 2 5 8
10. 3rd one-way clutchAT- 2 6 0
11. Gear systemAT- 2 2 8
12. Direct clutchAT- 2 7 4
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 9
, AT- 2 0.)AT- 2 4 0
No. Items Symptom Condition Diagnostic ItemReference
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TROUBLE DIAGNOSIS
AT-73
< SERVICE INFORMATION >
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34
Slips/Will
Not En-
gageWhen you press the
accelerator pedal and
shift speed D2 → D1
the engine idles or the
transmission slips.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 vehicle7. Torque converterAT-240
8. Oil pump assemblyAT-258
9. 3rd one-way clutchAT-260
10. 1st one-way clutchAT-267
11. Gear systemAT-228
12. Reverse brakeAT-240
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to AT-
19, AT- 2 0.)AT-240
14. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 9
, AT- 2 0.)AT-240
35With selector lever in
“D” position, accelera-
tion is extremely poor.ON vehicle1. Fluid level and stateAT- 5 1
2. Line pressure testAT- 5 1
3. Accelerator pedal position sensorAT- 11 7
4. CAN communication lineAT- 9 1
5. PNP switchAT- 9 9
6. Control cable adjustmentAT-208
7. Control valve with TCMAT-210
OFF vehicle8. Torque converterAT-240
9. Oil pump assemblyAT-258
10. 1st one-way clutchAT-267
11. Gear systemAT-228
12. Reverse brakeAT-240
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to AT-
19, AT- 2 0.)AT-240
14. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 9
, AT- 2 0.)AT-240
No. Items Symptom Condition Diagnostic ItemReference
page

AT-74
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
36
Slips/Will
Not En-
gageWith selector lever in
“R” position, accelera-
tion is extremely poor.ON vehicle1. Fluid level and stateAT- 5 1
2. Line pressure testAT- 5 1
3. Accelerator pedal position sensorAT- 11 7
4. ATF pressure switch 6, high and low reverse clutch sole-
noid valveAT- 1 5 6,
AT- 1 4 2
5. CAN communication lineAT- 9 1
6. PNP switchAT- 9 9
7. Control cable adjustmentAT- 2 0 8
8. Control valve with TCMAT- 2 1 0
OFF vehicle9. Gear systemAT- 2 2 810. Output shaftAT- 2 4 0
11. Reverse brakeAT- 2 4 0
37While starting off by
accelerating in 1st, en-
gine races or slippage
occurs.ON vehicle1. Fluid level and stateAT- 5 1
2. Line pressure testAT- 5 1
3. Accelerator pedal position sensorAT- 11 7
4. CAN communication lineAT- 9 1
5. Control valve with TCMAT- 2 1 0
OFF vehicle6. Torque converterAT- 2 4 0
7. Oil pump assemblyAT- 2 5 8
8. 3rd one-way clutchAT- 2 6 0
9. 1st one-way clutchAT- 2 6 7
10. Gear systemAT- 2 2 8
11. Reverse brakeAT- 2 4 0
12. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to AT-
19, AT- 2 0.)AT- 2 4 0
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 9
, AT- 2 0.)AT- 2 4 0
38While accelerating in
2nd, engine races or
slippage occurs.ON vehicle1. Fluid level and stateAT- 5 1
2. Line pressure testAT- 5 1
3. Accelerator pedal position sensorAT- 11 7
4. CAN communication lineAT- 9 1
5. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 5 4,
AT- 1 3 8
6. Control valve with TCMAT- 2 1 0
OFF vehicle7. Torque converterAT- 2 4 0
8. Oil pump assemblyAT- 2 5 8
9. 3rd one-way clutchAT- 2 6 0
10. Gear systemAT- 2 2 8
11. Direct clutchAT- 2 7 4
12. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 9
, AT- 2 0.)AT- 2 4 0
No. Items Symptom Condition Diagnostic ItemReference
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