lock INFINITI QX56 2007 Factory Owner's Manual

AT-44
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
l: NG X: OK
A/T 1st Engine Braking
• When there is an A/T first gear engine brake judgment malfunction, the low coast brake solenoid is switched
“OFF” to avoid the engine brake operation.
Line Pressure Solenoid
• The solenoid is switched “OFF” and the line pressure is set to the maximum hydraulic pressure to make driv-
ing possible.
Torque Converter Clutch Solenoid
• The solenoid is switched “OFF” to release the lock-up.
Low Coast Brake Solenoid
• When a (electrical or functional) malfunction occurs, in order to make driving possible, the engine brake is
not applied in 1st and 2nd gear.
Input Clutch Solenoid
• If a (electrical or functional) malfunction occurs with the solenoid either “ON” or “OFF”, the transmission is
held in 4th gear to make driving possible.
Direct Clutch Solenoid
• If a (electrical or functional) malfunction occurs with the solenoid either “ON” or “OFF”, the transmission is
held in 4th gear to make driving possible.
Front Brake Solenoid
• If a (electrical or functional) malfunction occurs with the solenoid “ON”, in order to make driving possible, the
A/T is held in 5th gear; if the solenoid is OFF, 4th gear.
High and Low Reverse Clutch Solenoid
• If a (electrical or functional) malfunction occurs with the solenoid either “ON” or “OFF”, the transmission is
held in 4th gear to make driving possible.
Turbine Revolution Sensor 1 or 2
• The control is the same as if there were no turbine revolution sensors, 5th gear is prohibited.
How To Perform Trouble Diagnosis for Quick and Accurate RepairINFOID:0000000003532245
INTRODUCTION
The TCM receives a signal from the vehicle speed sensor, accelerator pedal position sensor (throttle position
sensor) or PNP switch and provides shift control or lock-up control via A/T solenoid valves.
The TCM also communicates with the ECM by means of a signal
sent from sensing elements used with the OBD-related parts of the
A/T system for malfunction-diagnostic purposes. The TCM is capa-
ble of diagnosing malfunctioning parts while the ECM can store mal-
functions in its memory.
Input and output signals must always be correct and stable in the
operation of the A/T system. The A/T system must be in good oper-
ating condition and be free of valve seizure, solenoid valve malfunc-
tion, etc.
Gear positionATF pressure switch output
Fail-safe
functionClutch pressure output pattern after fail-safe func-
tion
SW3
(I/C)SW6
(HLR/
C)SW5
(D/C)SW1
(FR/B)SW2
(LC/B)I/C HLR/C D/C FR/B LC/B L/U
A/T interlock
coupling pat-
tern3rd – X X – lHeld in
2nd gearOFF OFF ON OFF OFF OFF
4th – X X –lHeld in
2nd gearOFF OFF ON OFF OFF OFF
5th X X – XlHeld in
2nd gearOFF OFF ON OFF OFF OFF
SAT631IB

TROUBLE DIAGNOSIS
AT-47
< SERVICE INFORMATION >
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Customer name MR/MS Model & Year VIN
Trans. Model Engine Mileage
Malfunction Date Manuf. Date In Service Date
Frequencyo Continuouso Intermittent ( times a day)
Symptomso Vehicle does not move. (o Any positiono Particular position)
o No up-shift (o 1st → 2ndo 2nd → 3rdo 3rd → 4th o 4th → 5th)
o No down-shift (o 5th → 4th o 4th → 3rdo 3rd → 2ndo 2nd → 1st)
o Lock-up malfunction
o Shift point too high or too low.
o Shift shock or slip (o N → Do Lock-upo Any drive position)
o Noise or vibration
o No kick down
o No pattern select
o Others
()
Malfunction indicator lamp (MIL)o Continuously lito Not lit
1o Read the item on cautions concerning fail-safe and understand the customer's complaint.AT- 4 3
2o ATF inspection
AT- 5 1o Leak (Repair leak location.)
o Sta te
o Amount
3o Stall test and line pressure test
AT- 5 1
, AT-
51
o Stall test
o Torque converter one-way clutch
o Front brake
o High and low reverse clutch
o Low coast brake
o Forward brake
o Reverse brake
o Forward one-way clutcho 1st one-way clutch
o 3rd one-way clutch
o Engine
o Line pressure low
o Except for input clutch and direct
clutch, clutches and brakes OK
o Line pressure inspection - Suspected part:

AT-48
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
4o Perform all road tests and enter checks in required inspection items.AT- 5 1
4-1.Check before engine is started
AT- 5 5
o AT- 1 6 7 , "A/T Check Indicator Lamp Does Not Come On".
o Perform self-diagnostics Enter checks for detected items. AT- 8 3
o AT- 9 1
o AT- 9 4
o AT- 9 8
o AT- 9 9
o AT- 1 0 3
o AT- 1 0 5
o AT- 1 0 9
o AT- 111
o AT- 11 3
o AT- 11 5
o AT- 11 7
o AT- 11 9
o AT- 1 2 4
o AT- 1 2 6
o AT- 1 2 8
o AT- 1 3 0
o AT- 1 3 2
o AT- 1 3 4
o AT- 1 3 6
o AT- 1 3 8
o AT- 1 4 0
o AT- 1 4 2
o AT- 1 4 4
o AT- 1 4 6
o AT- 1 4 8
o AT- 1 5 0
o AT- 1 5 2
o AT- 1 5 4
o AT- 1 5 6
4-2.Idle inspection
AT- 5 5
o AT- 1 6 8 , "Engine Cannot Be Started in "P" or "N" Position"
o AT- 1 6 8 , "In "P" Position, Vehicle Moves When Pushed"
o AT- 1 6 9 , "In "N" Position, Vehicle Moves"
o AT- 1 7 0 , "Large Shock ("N" to "D" Position)"
o AT- 1 7 2 , "Vehicle Does Not Creep Backward in "R" Position"
o AT- 1 7 5 , "Vehicle Does Not Creep Forward in "D" Position"
4-3.Driving tests
AT- 5 6
Part 1
o AT- 1 7 7 , "
Vehicle Cannot Be Started from D1"
o AT- 1 7 9 , "A/T Does Not Shift: D1→ D2"
o AT- 1 8 1 , "A/T Does Not Shift: D2→ D3"
o AT- 1 8 3 , "A/T Does Not Shift: D3→ D4"
o AT- 1 8 5 , "A/T Does Not Shift: D4→ D5"
o AT- 1 8 7 , "A/T Does Not Perform Lock-up"
o AT- 1 8 9 , "A/T Does Not Hold Lock-up Condition"
o AT- 1 9 0 , "Lock-up Is Not Released"
o AT- 1 9 1 , "Engine Speed Does Not Return to Idle"

TROUBLE DIAGNOSIS
AT-57
< SERVICE INFORMATION >
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6. Press the accelerator pedal about half way down to accelerate the vehicle.
With CONSULT-II
Read off the gear positions.
Starts from D1?
YES >> GO TO 2.
NO >> Enter a check mark at “Vehicle Cannot be Started From D1” on the diagnostics worksheet, then
continue the road test.
2.CHECK SHIFT-UP D1 → D2
Press down the accelerator pedal about half way and inspect if the vehicle shifts up (D1 → D2) at the appropri-
ate speed.
• Refer to AT-59, "
Vehicle Speed When Shifting Gears".
With CONSULT-II
Read the gear position, throttle degree of opening, and vehicle speed.
Does the A/T shift-up D1
→ D2 at the correct speed?
YES >> GO TO 3.
NO >> Enter a check mark at “A/T Does Not Shift: D1 → D2” on the diagnostics worksheet, then continue
the road test.
3.CHECK SHIFT-UP D2 → D3
Press down the accelerator pedal about half way and inspect if the vehicle shifts up (D2 → D3) at the appropri-
ate speed.
• Refer to AT-59, "
Vehicle Speed When Shifting Gears".
With CONSULT-II
Read the gear position, throttle degree of opening, 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 “A/T Does Not Shift: D2 → D3” on the diagnostics worksheet, then continue
the road test.
4.CHECK SHIFT-UP D3 → D4
Press down the accelerator pedal about half way and inspect if the vehicle shifts up (D3 → D4) at the appropri-
ate speed.
• Refer to AT-59, "
Vehicle Speed When Shifting Gears".
With CONSULT-II
Read the gear position, throttle degree of opening, and vehicle speed.
Does the A/T shift-up D3
→ D4 at the correct speed?
YES >> GO TO 5.
NO >> Enter a check mark at “A/T Does Not Shift: D3 → D4” on the diagnostics worksheet, then continue
the road test.
5.CHECK SHIFT-UP D4 → D5
Press down the accelerator pedal about half way and inspect if the vehicle shifts up (D4 → D5) at the appropri-
ate speed.
• Refer to AT-59, "
Vehicle Speed When Shifting Gears".
With CONSULT-II
Read the gear position, throttle degree of opening, and vehicle speed.
Does the A/T shift-up D4
→ D5 at the correct speed?
YES >> GO TO 6.
NO >> Enter a check mark at “A/T Does Not Shift: D4 → D5” on the diagnostics worksheet, then continue
the road test.
6.CHECK LOCK-UP
When releasing accelerator pedal from D5, check lock-up from D5 to L/U.
• Refer to AT-59, "
Vehicle Speed When Shifting Gears".
With CONSULT-II
Select “TCC SOLENOID 0.00A” with the “MAIN SIGNAL” mode for A/T.

AT-58
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
Does it lock-up?
YES >> GO TO 7.
NO >> Enter a check mark at “A/T Does Not Perform Lock-up” on the diagnostics worksheet, then con-
tinue the road test.
7.CHECK LOCK-UP HOLD
Does it maintain lock-up status?
YES >> GO TO 8.
NO >> Enter a check mark at “A/T Does Not Hold Lock-up Condition” on the diagnostics worksheet, then
continue the road test.
8.CHECK LOCK-UP RELEASE
Check lock-up cancellation by depressing brake pedal lightly to decelerate.
With CONSULT-II
Select “TCC SOLENOID 0.00A” with the “MAIN SIGNAL” mode for A/T.
Does lock-up cancel?
YES >> GO TO 9.
NO >> Enter a check mark at “Lock-up Is Not Released” on the diagnostics worksheet, then continue the
road test.
9.CHECK SHIFT-DOWN D5 → D4
Decelerate by pressing lightly on the brake pedal.
With CONSULT-II
Read the gear position and engine speed.
When the A/T shift-down D5
→ D4, does the engine speed drop smoothly back to idle?
YES >> 1. Stop the vehicle.
2. Go to Cruise test - Part 2 (Refer to AT- 5 8
).
NO >> Enter a check mark at “Engine Speed Does Not Return to Idle” on the diagnostics worksheet, then
continue the road test. Go to Cruise test - Part 2 (Refer to AT- 5 8
).
Cruise Test - Part 2INFOID:0000000003532252
1.CHECK STARTING FROM D1
1. Move selector lever the “D” position.
2. Accelerate at half throttle.
With CONSULT-II
Read the gear position.
Does it start from D1?
YES >> GO TO 2.
NO >> Enter a check mark at “Vehicle Cannot Be Started From D1” on the diagnostics worksheet, then
continue the road test.
2.CHECK SHIFT-UP D1 → D2
Press the accelerator pedal down all the way and inspect whether or not the transmission shifts up (D1 → D2)
at the correct speed.
• 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 D1
→ D2 at the correct speed?
YES >> GO TO 3.
NO >> Enter a check mark at “Vehicle Does Not Shift: D1 → D2” on the diagnostics worksheet, then con-
tinue the road test.
3.CHECK SHIFT-UP D2 → D3
Press the accelerator pedal down all the way and inspect whether or not the transmission shifts up (D2 → D3)
at the correct speed.

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)

TROUBLE DIAGNOSIS
AT-63
< SERVICE INFORMATION >
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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
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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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AT-76
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
41
Slips/Will
Not En-
gage While accelerating in
5th, 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 1 and front brake solenoid valveAT- 1 5 0,
AT- 1 3 4
6. Control valve with TCMAT- 2 1 0
OFF vehicle7. Torque converterAT- 2 4 0
8. Oil pump assemblyAT- 2 5 8
9. Front brake (brake band)AT- 2 4 0
10. Input clutchAT- 2 6 2
11. Gear systemAT- 2 2 8
12. High and low reverse clutchAT- 2 7 2
42 Slips at 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
43No creep at all.
Refer to AT-172, "
Ve -
hicle Does Not Creep
Backward in "R" Posi-
tion", AT- 1 7 5 , "Vehicle
Does Not Creep For-
ward in "D" Position"
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 5 and direct clutch solenoid valveAT- 1 5 4,
AT- 1 3 8
5. PNP switchAT- 9 9
6. CAN communication lineAT- 9 1
7. Control cable adjustmentAT- 2 0 8
8. Control valve with TCMAT- 2 1 0
OFF vehicle9. Torque converterAT- 2 4 0
10. Oil pump assemblyAT- 2 5 8
11. 1st one-way clutchAT- 2 6 7
12. Gear systemAT- 2 2 8
13. Reverse brakeAT- 2 4 0
14. Direct clutchAT- 2 7 4
15. 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
16. 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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