clutch INFINITI QX56 2006 Factory Workshop Manual

TROUBLE DIAGNOSISAT-77
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Revision: November 2009 2006 QX5644
Slips/Will
Not
Engage Vehicle cannot run in
all positions.
ON vehicle1. Fluid level and state
AT- 5 1
2. Line pressure testAT- 5 2
3. PNP switchAT-105
4. Control cable adjustmentAT-227
5. Control valve with TCMAT-230
OFF vehicle6. Oil pump assembly
AT-2827. Gear systemAT-250
8. Output shaftAT-264
45With selector lever in
“
D ” position, driving is
not possible. ON vehicle
1. Fluid level and state
AT- 5 1
2. Line pressure testAT- 5 2
3. PNP switchAT-105
4. Control cable adjustmentAT-227
5. Control valve with TCMAT-230
OFF vehicle6. Torque converter
AT-264
7. Oil pump assembly AT-282
8. 1st one-way clutchAT-291
9. Gear systemAT-250
10. Reverse brakeAT-264
11. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8 .) AT-264
12. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 7
, AT- 1 8
.) AT-264
46
With selector lever in
“
R ” position, driving is
not possible. ON vehicle
1. Fluid level and state
AT- 5 1
2. Line pressure testAT- 5 2
3. PNP switchAT-105
4. Control cable adjustmentAT-227
5. Control valve with TCMAT-230
OFF vehicle6. Gear system
AT-2507. Output shaftAT-264
8. Reverse brakeAT-264
47 OthersShift point is high in
“
D ” position. ON vehicle1. Vehicle speed sensor A/T and vehicle speed sensor MTR
AT- 111
,
AT-132
2. Accelerator pedal position sensor AT-124
3. CAN communication line AT- 9 6
4. ATF temperature sensorAT-127
5. Control valve with TCMAT-230
No. ItemsSymptom Condition Diagnostic ItemReference
page

AT-78
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
48
Others Shift point is low in “
D”
position. ON vehicle1. Vehicle speed sensor A/T and vehicle speed sensor MTR
AT- 111
,
AT- 1 3 2
2. Accelerator pedal position sensor AT- 1 2 4
3. CAN communication line AT- 9 6
4. Control valve with TCMAT- 2 3 0
49Judder occurs during
lock-up. ON vehicle1. Fluid level and state
AT- 5 1
2. Engine speed signalAT- 11 6
3. Turbine revolution sensorAT- 1 0 9
4. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT- 1 3 2
5. Accelerator pedal position sensor AT- 1 2 4
6. CAN communication line AT- 9 6
7. Torque converter clutch solenoid valveAT- 11 8
8. Control valve with TCMAT- 2 3 0
OFF vehicle 9. Torque converter AT- 2 6 4
50Strange noise in “
R”
position. ON vehicle
1. Fluid level and state
AT- 5 1
2. Engine speed signalAT- 11 6
3. CAN communication line AT- 9 6
4. Control valve with TCMAT- 2 3 0
OFF vehicle5. Torque converter
AT- 2 6 4
6. Oil pump assemblyAT- 2 8 2
7. Gear systemAT- 2 5 0
8. High and low reverse clutchAT- 2 9 6
9. Reverse brakeAT- 2 6 4
51Strange noise in “
N”
position. ON vehicle
1. Fluid level and state
AT- 5 1
2. Engine speed signalAT- 11 6
3. CAN communication line AT- 9 6
4. Control valve with TCMAT- 2 3 0
OFF vehicle5. Torque converter
AT- 2 6 46. Oil pump assemblyAT- 2 8 2
7. Gear systemAT- 2 5 0
52Strange noise in “
D”
position. ON vehicle
1. Fluid level and state
AT- 5 1
2. Engine speed signalAT- 11 6
3. CAN communication line AT- 9 6
4. Control valve with TCMAT- 2 3 0
OFF vehicle5. Torque converter
AT- 2 6 4
6. Oil pump assemblyAT- 2 8 2
7. Gear systemAT- 2 5 0
8. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 7
, AT- 1 8
.) AT- 2 6 4
No. Items
Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSISAT-79
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Revision: November 2009 2006 QX5653
Others Vehicle dose not
decelerate by engine
brake.
Refer to
AT-218,
"Vehicle Does Not
Decelerate By Engine
Brake" . ON vehicle
1. PNP switch
AT-105
2. Fluid level and state AT- 5 1
3. Control cable adjustmentAT-227
4. 1st position switchAT-218
5. ATF pressure switch 5AT-163
6. CAN communication line AT- 9 6
7. Control valve with TCMAT-230
OFF vehicle8. Input clutch
AT-2869. High and low reverse clutchAT-296
10. Direct clutchAT-298
54Engine brake does
not operate in
“2 ”
position. ON vehicle1. PNP switch
AT-105
2. Fluid level and state AT- 5 1
3. Control cable adjustmentAT-227
5. ATF pressure switch 6AT-165
6. CAN communication line AT- 9 6
7. Control valve with TCMAT-230
OFF vehicle8. Front brake (brake band)
AT-2649. Input clutchAT-286
10. High and low reverse clutchAT-296
55Engine brake does
not operate in
“1 ”
position. ON vehicle1. PNP switch
AT-105
2. Fluid level and state AT- 5 1
3. Control cable adjustmentAT-227
4. 1st position switchAT-218
5. ATF pressure switch 5AT-163
6. CAN communication line AT- 9 6
7. Control valve with TCMAT-230
OFF vehicle8. Input clutch
AT-2869. High and low reverse clutchAT-296
10. Direct clutchAT-298
No. ItemsSymptom Condition Diagnostic ItemReference
page

AT-80
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
56
Others Maximum speed low.
ON vehicle
1. Fluid level and state
AT- 5 1
2. Line pressure testAT- 5 2
3. Accelerator pedal position sensorAT- 1 2 4
4. CAN communication line AT- 9 6
5. Direct clutch solenoid valveAT- 1 4 7
6. Control valve with TCMAT- 2 3 0
OFF vehicle7. Torque converter
AT- 2 6 4
8. Oil pump assemblyAT- 2 8 2
9. Input clutchAT- 2 8 6
10. Gear systemAT- 2 5 0
11. High and low reverse clutchAT- 2 9 6
12. Direct clutchAT- 2 9 8
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8 .) AT- 2 6 4
14 Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8
.) AT- 2 6 4
57
Extremely large
creep. ON vehicle1. Engine idle speed
EC-76

2. CAN communication line AT- 9 6
3. ATF pressure switch 5AT- 1 6 3
OFF vehicle 4. Torque converter AT- 2 6 4
58With selector lever in
“
P ” position, vehicle
does not enter parking
condition or, with
selector lever in
another position, park-
ing condition is not
cancelled.
Refer to AT-180, "
In
“P” Position, Vehicle
Moves When Pushed"
. ON vehicle
1. PNP switch
AT- 1 0 5
2. Control cable adjustmentAT- 2 2 7
OFF vehicle 3. Parking pawl components AT- 2 5 0
59Vehicle runs with
transmission in
“P ”
position. ON vehicle1. PNP switch
AT- 1 0 5
2. Fluid level and state AT- 5 1
3. Control cable adjustmentAT- 2 2 7
4. Control valve with TCMAT- 2 3 0
5. Parking pawl componentsAT- 2 5 0
OFF vehicle 6. Gear system AT- 2 5 0
No. ItemsSymptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSISAT-81
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Revision: November 2009 2006 QX56
60
Others Vehicle runs with
transmission in
“N ”
position.
Refer to AT-181, "In
“N” Position, Vehicle
Moves" . ON vehicle
1. PNP switch
AT-105
2. Fluid level and state AT- 5 1
3. Control cable adjustmentAT-227
4. Control valve with TCMAT-230
OFF vehicle5. Input clutch
AT-286
6. Gear systemAT-250
7. Direct clutchAT-298
8. Reverse brakeAT-264
9. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8 .) AT-264
10. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 7
, AT- 1 8
.) AT-264
61Engine does not start
in
“N ” or “P ” position.
Refer to AT-179, "Engine Cannot Be
Started In “P” or “N”
Position" . ON vehicle
1. Ignition switch and starter
PG-4
, SC-
10
2. Control cable adjustment
AT-227
3. PNP switchAT-105
62Engine starts in posi-
tions other than “
N” or
“ P ”. ON vehicle1. Ignition switch and starter
PG-4
, SC-
10
2. Control cable adjustment
AT-227
3. PNP switchAT-105
63Engine stall. ON vehicle1. Fluid level and state
AT- 5 1
2. Engine speed signalAT- 11 6
3. Turbine revolution sensorAT-109
4. Torque converter clutch solenoid valve AT- 11 8
5. CAN communication line AT- 9 6
6. Control valve with TCMAT-230
OFF vehicle 7. Torque converter AT-264
64Engine stalls when
select lever shifted
“N ”
→ “ D ”, “ R”. ON vehicle1. Fluid level and state
AT- 5 1
2. Engine speed signalAT- 11 6
3. Turbine revolution sensorAT-109
4. Torque converter clutch solenoid valve AT- 11 8
5. CAN communication line AT- 9 6
6. Control valve with TCMAT-230
OFF vehicle 7. Torque converter AT-264
No. ItemsSymptom Condition Diagnostic ItemReference
page

AT-82
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
65 OthersEngine speed does
not return to idle.
Refer to
AT-208,
"Engine Speed Does
Not Return to Idle" .ON vehicle 1. Fluid level and state
AT- 5 1
2. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 6 3,
AT- 1 4 7
3. ATF pressure switch 1 and front brake solenoid valve AT- 1 5 9,
AT- 1 4 3
4. Accelerator pedal position sensor AT- 1 2 4
5. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT- 1 3 2
6. CAN communication line AT- 9 6
7. Control valve with TCMAT- 2 3 0
OFF vehicle8. Front brake (brake band)
AT- 2 6 49. Direct clutchAT- 2 9 8
No. ItemsSymptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSISAT-85
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Revision: November 2009 2006 QX56
ATF PRES SW 1Front brake engaged. Refer to
AT- 2 0ON
Front brake disengaged. Refer to AT- 2 0
OFF
ATF PRES SW 2 Low coast brake engaged. Refer to
AT- 2 0
ON
Low coast brake disengaged. Refer to AT- 2 0
OFF
ATF PRES SW 3 Input clutch engaged. Refer to
AT- 2 0
ON
Input clutch disengaged. Refer to AT- 2 0
OFF
ATF PRES SW 5 Direct clutch engaged. Refer to
AT- 2 0
ON
Direct clutch disengaged. Refer to AT- 2 0
OFF
ATF PRES SW 6 High and low reverse clutch engaged. Refer to
AT- 2 0
ON
High and low reverse clutch disengaged. Refer to AT- 2 0
OFF
I/C SOLENOID Input clutch disengaged. Refer to
AT- 2 0
0.6 - 0.8 A
Input clutch engaged. Refer to AT- 2 0
0 - 0.05 A
FR/B SOLENOID Front brake engaged. Refer to
AT- 2 0
0.6 - 0.8 A
Front brake disengaged. Refer to AT- 2 0
0 - 0.05 A
D/C SOLENOID Direct clutch disengaged. Refer to
AT- 2 0
0.6 - 0.8 A
Direct clutch engaged. Refer to AT- 2 0
0 - 0.05 A
HLR/C SOL High and low reverse clutch disengaged. Refer to
AT- 2 0
0.6 - 0.8 A
High and low reverse clutch engaged. Refer to AT- 2 0
0 - 0.05 A
ON OFF SOL Low coast brake engaged. Refer to
AT- 2 0
ON
Low coast brake disengaged. Refer to AT- 2 0
OFF
STARTER RELAY Selector lever in
“N ”,“ P ” position. ON
Selector lever in other position. OFF
ACCELE POSI Released accelerator pedal.
0.0/8
Fully depressed accelerator pedal. 8/8
CLSD THL POS Released accelerator pedal.
ON
Fully depressed accelerator pedal. OFF
W/O THL POS Fully depressed accelerator pedal.
ON
Released accelerator pedal. OFF
BRAKE SW Depressed brake pedal.
ON
Released brake pedal. OFF
Item name
Condition Display value (Approx.)

AT-118
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
Revision: November 20092006 QX56
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVEPFP:31940
DescriptionECS00CFN

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 sen-
sor). 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 ValueECS00CFO
On Board Diagnosis LogicECS00CFP

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 CauseECS00CFQ

Torque converter clutch solenoid valve

Harness or connectors
(The solenoid circuit is open or shorted.)
DTC Confirmation ProcedureECS00CFR
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- 11 9 , "
Diagnostic Procedure" .
WITH GST
Follow the procedure “With CONSULT-II”.
Item name Condition Display value (Approx.)
TCC SOLENOID When performing slip lock-up
0.2 - 0.4 A
When performing lock-up 0.4 - 0.6 A
BCIA0030E

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVEAT-119
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Revision: November 2009 2006 QX56
Diagnostic ProcedureECS00CFS
1. CHECK INPUT SIGNAL
With CONSULT-II
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- 1 6 7 , "
MAIN POWER SUPPLY AND GROUND CIR-
CUIT" .
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 connec-
tor.
OK or NG
OK >> Replace the control valve with TCM. Refer to AT- 2 3 0 , "Control Valve With TCM and A/T Fluid
Temperature Sensor 2" .
NG >> Repair or replace damaged parts.
4. CHECK DTC
Perform “DTC Confirmation Procedure ”.

Refer to AT- 11 8 , "DTC Confirmation Procedure" .
OK or NG
OK >> INSPECTION END
NG >> GO TO 2.
Item name Condition Display value (Approx.)
TCC SOLENOID When performing slip lock-up
0.2 - 0.4 A
When performing lock-up 0.4 - 0.6 A
SCIA4793E

AT-120
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
Revision: November 20092006 QX56
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)PFP:31940
DescriptionECS00CFT
This malfunction is detected when the A/T does not shift into 5th gear position or the torque converter clutch
does not lock-up as instructed by the TCM. This is not only caused by electrical malfunction (circuits open or
shorted) but also by mechanical malfunction such as control valve sticking, improper solenoid valve operation,
etc.
CONSULT-II Reference ValueECS00CFU
On Board Diagnosis LogicECS00CFV

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P0744 A/T TCC S/V FNCTN ” with CONSULT-II is detected under the following
conditions.
–When A/T cannot perform lock-up even if electrical circuit is good.
–When TCM detects as irregular by comparing difference value with slip rotation.
Possible CauseECS00CFW

Harness or connectors
(The solenoid circuit is open or shorted.)

Torque converter clutch solenoid valve

Hydraulic control circuit
DTC Confirmation ProcedureECS00CFX
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. Start engine and Select “TCC S/V FNCTN CHECK” of “DTC
WORK SUPPORT ” mode for “A/T” with CONSULT-II and touch
“START ”.
2. Accelerate vehicle to more than 80 km/h (50 MPH) and maintain the following condition continuously until “TESTING” has turned
to “COMPLETE ”. (It will take approximately 30 seconds after
“TESTING ” shows.)
ACCELE POSI: More than 1.0/8 (at all times during step 4)
TCC SOLENOID: 0.4 - 0.6 A
Selector lever: “D” position
[Reference speed: Constant speed of more than 80 km/h (50
MPH)]
–Make sure “GEAR” shows “5”.
–For shift schedule, refer to AT- 3 2 4 , "Vehicle Speed When Performing and Releasing Complete
Lock-up" .
–If “TESTING” does not appear on CONSULT-II for a long time, select “SELF-DIAG RESULTS”. In
case a 1st trip DTC other than P0744 is shown, refer to applicable “TROUBLE DIAGNOSIS FOR
DTC”.
3. Make sure that “OK ” is displayed. (If “NG” is displayed, refer to “DIAGNOSTIC PROCEDURE ”.)
Refer to AT- 1 2 1 , "
Diagnostic Procedure" .
Refer to shift schedule, AT- 3 2 4 , "
Vehicle Speed When Performing and Releasing Complete Lock-up" .
Item name Condition Display value (Approx.)
TCC SOLENOID When performing slip lock-up
0.2 - 0.4 A
When performing lock-up 0.4 - 0.6 A
BCIA0030E