2007 INFINITI QX56 torque

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
page

TROUBLE DIAGNOSIS
AT-77
< SERVICE INFORMATION >
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P44
Slips/Will
Not En-
gageVehicle cannot run in
all positions.ON vehicle1. Fluid level and stateAT- 5 1
2. Line pressure testAT- 5 1
3. PNP switchAT- 9 9
4. Control cable adjustmentAT-208
5. Control valve with TCMAT-210
OFF vehicle6. Oil pump assemblyAT-2587. Gear systemAT-228
8. Output shaftAT-240
45With selector lever in
“D” position, driving is
not possible.ON vehicle1. Fluid level and stateAT- 5 1
2. Line pressure testAT- 5 1
3. PNP switchAT- 9 9
4. Control cable adjustmentAT-208
5. Control valve with TCMAT-210
OFF vehicle6. Torque converterAT-240
7. Oil pump assembly AT-258
8. 1st one-way clutchAT-267
9. Gear systemAT-228
10. Reverse brakeAT-240
11. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to AT-
19, AT- 2 0.)AT-240
12. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 9
, AT- 2 0.)AT-240
46With selector lever in
“R” position, driving is
not possible.ON vehicle1. Fluid level and stateAT- 5 1
2. Line pressure testAT- 5 1
3. PNP switchAT- 9 9
4. Control cable adjustmentAT-208
5. Control valve with TCMAT-210
OFF vehicle6. Gear systemAT-2287. Output shaftAT-240
8. Reverse brakeAT-240
47 OthersShift point is high in
“D” position.ON vehicle1. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5
,
AT-124
2. Accelerator pedal position sensorAT- 11 7
3. CAN communication lineAT- 9 1
4. ATF temperature sensorAT- 11 9
5. Control valve with TCMAT-210
No. Items Symptom Condition Diagnostic ItemReference
page

AT-78
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
48
OthersShift point is low in “D”
position.ON vehicle1. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5
,
AT- 1 2 4
2. Accelerator pedal position sensorAT- 11 7
3. CAN communication lineAT- 9 1
4. Control valve with TCMAT- 2 1 0
49Judder occurs during
lock-up.ON vehicle1. Fluid level and stateAT- 5 1
2. Engine speed signalAT- 1 0 9
3. Turbine revolution sensorAT- 1 0 3
4. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5,
AT- 1 2 4
5. Accelerator pedal position sensorAT- 11 7
6. CAN communication lineAT- 9 1
7. Torque converter clutch solenoid valveAT- 111
8. Control valve with TCMAT- 2 1 0
OFF vehicle 9. Torque converterAT- 2 4 0
50Strange noise in “R”
position.ON vehicle1. Fluid level and stateAT- 5 1
2. Engine speed signalAT- 1 0 9
3. CAN communication lineAT- 9 1
4. Control valve with TCMAT- 2 1 0
OFF vehicle5. Torque converterAT- 2 4 0
6. Oil pump assemblyAT- 2 5 8
7. Gear systemAT- 2 2 8
8. High and low reverse clutchAT- 2 7 2
9. Reverse brakeAT- 2 4 0
51Strange noise in “N”
position.ON vehicle1. Fluid level and stateAT- 5 1
2. Engine speed signalAT- 1 0 9
3. CAN communication lineAT- 9 1
4. Control valve with TCMAT- 2 1 0
OFF vehicle5. Torque converterAT- 2 4 06. Oil pump assemblyAT- 2 5 8
7. Gear systemAT- 2 2 8
52Strange noise in “D”
position.ON vehicle1. Fluid level and stateAT- 5 1
2. Engine speed signalAT- 1 0 9
3. CAN communication lineAT- 9 1
4. Control valve with TCMAT- 2 1 0
OFF vehicle5. Torque converterAT- 2 4 0
6. Oil pump assemblyAT- 2 5 8
7. Gear systemAT- 2 2 8
8. 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
page

AT-80
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
56
OthersMaximum speed low.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. Direct clutch solenoid valveAT- 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. Input clutchAT- 2 6 2
10. Gear systemAT- 2 2 8
11. High and low reverse clutchAT- 2 7 2
12. Direct clutchAT- 2 7 4
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
57 Extremely large creep.ON vehicle1. Engine idle speed EC-75

2. CAN communication lineAT- 9 1
3. ATF pressure switch 5AT- 1 5 4
OFF vehicle 4. Torque converterAT- 2 4 0
58With selector lever in
“P” position, vehicle
does not enter parking
condition or, with se-
lector lever in another
position, parking con-
dition is not cancelled.
Refer to AT-168, "
In
"P" Position, Vehicle
Moves When
Pushed".ON vehicle1. PNP switchAT- 9 9
2. Control cable adjustmentAT- 2 0 8
OFF vehicle 3. Parking pawl componentsAT- 2 2 8
59Vehicle runs with
transmission in “P” po-
sition.ON vehicle1. PNP switchAT- 9 9
2. Fluid level and stateAT- 5 1
3. Control cable adjustmentAT- 2 0 8
4. Control valve with TCMAT- 2 1 0
5. Parking pawl componentsAT- 2 2 8
OFF vehicle 6. Gear systemAT- 2 2 8
No. Items Symptom Condition Diagnostic ItemReference
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TROUBLE DIAGNOSIS
AT-81
< SERVICE INFORMATION >
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60
OthersVehicle runs with
transmission in “N” po-
sition.
Refer to AT- 1 6 9 , "In
"N" Position, Vehicle
Moves".ON vehicle1. PNP switchAT- 9 9
2. Fluid level and stateAT- 5 1
3. Control cable adjustmentAT-208
4. Control valve with TCMAT-210
OFF vehicle5. Input clutchAT-262
6. Gear systemAT-228
7. Direct clutchAT-274
8. Reverse brakeAT-240
9. Forward one- way clutch (Parts behind drum support is im-
possible to perform inspection by disassembly. Refer to AT-
19, AT- 2 0.)AT-240
10. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 9
, AT- 2 0.)AT-240
61Engine does not start
in “N” or “P” position.
Refer to AT- 1 6 8 , "En-
gine Cannot Be Start-
ed in "P" or "N"
Position".ON vehicle1. Ignition switch and starterPG-3
, SC-
9
2. Control cable adjustmentAT-208
3. PNP switchAT- 9 9
62Engine starts in posi-
tions other than “N” or
“P”.ON vehicle1. Ignition switch and starterPG-3
, SC-
9
2. Control cable adjustmentAT-208
3. PNP switchAT- 9 9
63 Engine stall.ON vehicle1. Fluid level and stateAT- 5 1
2. Engine speed signalAT-109
3. Turbine revolution sensorAT-103
4. Torque converter clutch solenoid valveAT- 111
5. CAN communication lineAT- 9 1
6. Control valve with TCMAT-210
OFF vehicle 7. Torque converterAT-240
64Engine stalls when se-
lect lever shifted “N” →
“D”, “R”.ON vehicle1. Fluid level and stateAT- 5 1
2. Engine speed signalAT-109
3. Turbine revolution sensorAT-103
4. Torque converter clutch solenoid valveAT- 111
5. CAN communication lineAT- 9 1
6. Control valve with TCMAT-210
OFF vehicle 7. Torque converterAT-240
No. Items Symptom Condition Diagnostic ItemReference
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TROUBLE DIAGNOSIS
AT-87
< SERVICE INFORMATION >
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X: Standard, —: Not applicable
Monitored item (Unit)Monitor Item Selection
Remarks ECU IN-
PUT SIG-
NALSMAIN SIG-
NALSSELEC-
TION
FROM
MENU
VHCL/S SE·A/T (km/h) X X X Revolution sensor
VHCL/S SE·MTR (km/h) X — X
ACCELE POSI (0.0/8) X — X Accelerator pedal position signal
THROTTLE POSI (0.0/8) X X XDegree of opening for accelerator recognized by
the TCM
For fail-safe operation, the specific value used
for control is displayed.
CLSD THL POS (ON-OFF display) X — X
Signal input with CAN communications
W/O THL POS (ON-OFF display) X — X
BRAKE SW (ON-OFF display) X — X Stop lamp switch
GEAR — X XGear position recognized by the TCM updated
after gear-shifting
ENGINE SPEED (rpm) X X X
TURBINE REV (rpm) X X X
OUTPUT REV (rpm) X X X
GEAR RATIO — X X
TC SLIP SPEED (rpm) — X XDifference between engine speed and torque
converter input shaft speed
F SUN GR REV (rpm) — — X
F CARR GR REV (rpm) — — X
ATF TEMP SE 1 (V) X — X
ATF TEMP SE 2 (V) X — X
ATF TEMP 1 (°C) — X X
ATF TEMP 2 (°C) — X X
BATTERY VOLT (V) X — X
ATF PRES SW 1 (ON-OFF display) X X X (for FR/B solenoid)
ATF PRES SW 2 (ON-OFF display) X X X (for LC/B solenoid)
ATF PRES SW 3 (ON-OFF display) X X X (for I/C solenoid)
ATF PRES SW 5 (ON-OFF display) X X X (for D/C solenoid)
ATF PRES SW 6 (ON-OFF display) X X X (for HLR/C solenoid)
PNP SW 1 (ON-OFF display) X — X
PNP SW 2 (ON-OFF display) X — X
PNP SW 3 (ON-OFF display) X — X
PNP SW 4 (ON-OFF display) X — X
SLCT LVR POSI — X XSelector lever position is recognized by the TCM.
For fail-safe operation, the specific value used
for control is displayed.
1 POSITION SW (ON-OFF display) X — X 1st position switch
OD CONT SW (ON-OFF display) X — X 4th position switch

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
AT-111
< SERVICE INFORMATION >
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DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
DescriptionINFOID:0000000003532304
• The torque converter clutch solenoid valve is activated, with the gear in D4, D5 by the TCM in response to
signals sent from the vehicle speed sensor and accelerator pedal position sensor (throttle position sensor).
Torque converter clutch piston operation will then be controlled.
• Lock-up operation, however, is prohibited when A/T fluid temperature is too low.
• When the accelerator pedal is depressed (less than 1/8) in lock-up condition, the engine speed should not
change abruptly. If there is a big jump in engine speed, there is no lock-up.
CONSULT-II Reference Value in Data Monitor ModeINFOID:0000000003532305
On Board Diagnosis LogicINFOID:0000000003532306
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0740 TCC SOLENOID/CIRC” with CONSULT-II is detected under the following
conditions.
- When TCM detects an improper voltage drop when it tries to operate the solenoid valve.
- When TCM detects as irregular by comparing target value with monitor value.
Possible CauseINFOID:0000000003532307
• Torque converter clutch solenoid valve
• Harness or connectors
(The solenoid circuit is open or shorted.)
DTC Confirmation ProcedureINFOID:0000000003532308
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “DATA MONITOR” mode for “ENGINE” with CONSULT-II.
3. Start engine and maintain the following conditions for at least 5
consecutive seconds.
VHCL SPEED SE: 80 km/h (50 MPH) or more
ACCELE POS: 0.5/8 - 1.0/8
SELECTOR LEVER: “D” position
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.
4. If DTC is detected go to AT- 111 , "
Diagnosis Procedure".
WITH GST
Follow the procedure “With CONSULT-II”.
Diagnosis ProcedureINFOID:0000000003532309
1.CHECK INPUT SIGNAL
With CONSULT-II
Item name Condition Display value (Approx.)
TCC SOLENOIDWhen performing slip lock-up 0.2 - 0.4 A
When performing lock-up 0.4 - 0.6 A
BCIA0031E

AT-112
< SERVICE INFORMATION >
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
1. Turn ignition switch “ON”.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T”
with CONSULT-II.
3. Start engine.
4. Read out the value of “TCC SOLENOID” while driving.
OK or NG
OK >> GO TO 4.
NG >> GO TO 2.
2.CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to AT-158
.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3.DETECT MALFUNCTIONING ITEM
Check the following items:
• The A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> Replace the control valve with TCM. Refer to AT-210, "Control Valve with TCM and A/T Fluid Tem-
perature Sensor 2".
NG >> Repair or replace damaged parts.
4.CHECK DTC
Perform “DTC Confirmation Procedure”.
• Refer to AT- 111 , "
DTC Confirmation Procedure".
OK or NG
OK >>INSPECTION END
NG >> GO TO 2.
Item name Condition Display value (Approx.)
TCC SOLENOIDWhen performing slip lock-up 0.2 - 0.4 A
When performing lock-up 0.4 - 0.6 A
SCIA4793E