tow INFINITI QX56 2011 Factory Manual PDF

TM-44
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
SYSTEM
SYSTEM
A/T CONTROL SYSTEM
A/T CONTROL SYSTEM : System DiagramINFOID:0000000006226767
A/T CONTROL SYSTEM : System DescriptionINFOID:0000000006226768
INPUT/OUTPUT SIGNAL CHART
SYSTEM DESCRIPTION
 The A/T senses vehicle operating conditions through vari
ous sensors or signals. It always controls the opti-
mum shift position and reduces shifting and lock-up shocks.
 Receive input signals transmitted from various switches and sensors.
 Determine required line pressure, shifting point, lock-up operation, etc.
JSDIA1853GB
Sensor (or signal)
⇒TCM function
⇒Actuator
Transmission range switch
Accelerator pedal position signal
Closed throttle position signal
Wide open throttle position signal
Engine speed signal
A/T fluid temperature sensor
Output speed sensor
Vehicle speed signal
Manual mode switch signal
Stop lamp switch signal
Input speed sensor 1, 2
Yaw rate/side/decel G sensor
Tow mode switch signal Line pressure control (
TM-48
)
Shift change control ( TM-50
)
Shift pattern control ( TM-54
)
Lock-up control ( TM-56
)
Fail-safe control ( TM-45
)
Self-diagnosis ( TM-61
)
CONSULT-III communication line ( TM-61
)
CAN communication line ( TM-103
)Input clutch solenoid valve
Direct clutch solenoid valve
Front brake solenoid valve
High and low reverse clutch solenoid valve
Low brake solenoid valve
Torque converter clutch solenoid valve
Line pressure solenoid valve
Anti-interlock solenoid valve
2346 brake solenoid valve
A/T CHECK indicator lamp
Tow mode indicator lamp
Shift position indicator
Back-up lamp relay
Starter relay
Revision: 2010 May2011 QX56

SYSTEMTM-55
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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Input/Output Signal Chart
*: This signal is transmitted via CAN communication line.
 When driving on an up/down slope ASC judges up/down slope according to engine torque data transmitted from the ECM and vehicle speed.
Fixing at 4GR, 5GR or 6GR on an up-slope prevents sh ift hunting and controls the vehicle to gain optimum
driving force. On a down-slope, automatic shift-down to 4GR, 5GR or 6GR controls to gain optimum engine
brake.
 When driving on a curve TCM receives the side G sensor signal from the ABS ac tuator and electric unit (control unit). It locks to 4GR,
5GR or 6GR position in moderate cornering or to 3G R position in sharp cornering based on this signal. This
prevents any upshift and kickdown during corner ing, maintaining smooth vehicle travel.
To w M o d e
 High driving torque is required for towing a heavy load. The tow mode enables torque-oriented driving by
changing the shift schedule to that of delaying A/T gear shift timing (compared to normal driving).
 TCM receives tow mode switch signal from combination meter via CAN communication. The tow mode turns ON when TCM receives the signal. TCM transmits a tow mode indicator lamp signal to the combination
meter via CAN communication to turn ON the tow mode indicator lamp mounted in the combination meter.
MANUAL MODE
Item Signal TCM function Actuator
Input speed sensor 1, 2 Input speed
ASC (Adaptive shift control)  High and low reverse
clutch solenoid valve
 Direct clutch solenoid valve
 Input clutch solenoid valve
 Low brake solenoid valve
 2346 brake solenoid valve
 Front brake solenoid valve
 Torque converter clutch so- lenoid valve
 Line pressure solenoid valve
 Anti-interlock solenoid
valve
Output speed sensor Vehicle speed
A/T fluid temperature sensor ATF temperature
ECM
Engine speed signal*
Accelerator pedal position signal*
Closed throttle position signal*
Engine and A/T integrated control signal
(engine torque)*
ABS actuator and electric unit
(control unit) Side G sensor signal*
BCM Stop lamp switch signal*
Combination meter Tow mode switch signal*
JSDIA1362GB
Revision: 2010 May2011 QX56

TM-64
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
DIAGNOSIS SYSTEM (TCM)
TRG PRE 2346/B
(kPa, kg/cm2 or psi)—— Displays the target oil pressure value of 2346
brake solenoid valve calculated by the oil pres-
sure calculation process of shift change control.
SHIFT PATTERN — — Displays the gear change data using the shift
pattern control.
VEHICLE SPEED (km/h or mph) — — Displays the vehicle speed for control using the
control of TCM.
G SEN SLOPE (%) X — Displays the inclination angle calculated by the
G sensor signal received via CAN communica-
tion.
RANGE SW 4 (ON/OFF) X — Displays the operation status of transmission
range switch 4.
RANGE SW 3 (ON/OFF) X — Displays the operation status of transmission
range switch 3.
RANGE SW 2 (ON/OFF) X — Displays the operation status of transmission
range switch 2.
RANGE SW 1 (ON/OFF) X — Displays the operation status of transmission
range switch 1.
SFT DWN ST SW (ON/OFF) X —  Displays the operation status of paddle
shifter (down switch).
 Not mounted but displayed.
SFT UP ST SW (ON/OFF) X —  Displays the operation status of paddle
shifter (up switch).
 Not mounted but displayed.
DOWN SW LEVER (ON/OFF) X — Displays the operation status of selector lever
(down switch).
UP SW LEVER (ON/OFF) X — Displays the operation status of selector lever
(up switch).
NON M-MODE SW (ON/OFF) X — Displays whether the selector lever is in any po-
sition other than manual shift gate position.
MANU MODE SW (ON/OFF) X — Displays whether the selector lever is in the
manual shift gate position.
TOW MODE SW (ON/OFF) — — Displays the reception status of tow mode
switch signal received via CAN communication.
DS RANGE (ON/OFF) — —  Displays whether it is the DS mode.
 Not mounted but displayed.
1 POSITION SW (ON/OFF) X —  Displays the reception status of 1 position
switch signal received via CAN communica-
tion.
 Not mounted but displayed.
OD CONT SW (ON/OFF) X —  Displays the reception status of overdrive
control switch signal received via CAN com-
munication.
 Not mounted but displayed.
BRAKESW (ON/OFF) X — Displays the reception status of stop lamp
switch signal received via CAN communication.
POWERSHIFT SW (ON/OFF) X —  Displays the reception status of POWER
mode signal received via CAN communica-
tion.
 Not mounted but displayed.
Monitored item (Unit)
Monitor Item Selection
Remarks
ECU IN-
PUT SIG- NALS MAIN SIG-
NALS SELEC-
TION
FROM ITEM
Revision: 2010 May2011 QX56

TM-70
< ECU DIAGNOSIS INFORMATION >[7AT: RE7R01B]
TCM
TRGT PRES L/BLow brake is engaged 1370 kPa
Low brake is disengaged 0 kPa
TRGT PRES FR/B Front brake is engaged 1370 kPa
Front brake is disengaged 0 kPa
TRG PRE HLR/C High and low reverse clutch is disengaged 1370 kPa
High and low reverse clutch is engaged 0 kPa
TRGT PRES I/C Input clutch is disengaged 1370 kPa
Input clutch is engaged 0 kPa
TRGT PRES D/C Direct clutch is disengaged 1370 kPa
Direct clutch is engaged 0 kPa
TRG PRE 2346/B 2346 brake is engaged 1370 kPa
2346 brake is disengaged 0 kPa
SHIFT PATTERN During normal driving (without shift changes) FF
VEHICLE SPEED During driving Approximately equals the speed-
ometer reading.
G SEN SLOPE Level road 0%
Uphill slope Positive value (maximum 40.45%)
Downhill slope
Negative value (minimum
−
40.45%)
RANGE SW 4 Selector lever in “P
” and “N” positions OFF
Other than the above ON
RANGE SW 3 Selector lever in “P”,
“R” and “N” positions OFF
Other than the above ON
RANGE SW 2 Selector lever in “P
” and “R” positions OFF
Other than the above ON
RANGE SW 1 Selector lever in “P” position OFF
Other than the above ON
SFT DWN ST SW* Paddle shifter (shift-down) is pulled ON
Other than the above OFF
SFT UP ST SW* Paddle shifter (shift-up) is pulled ON
Other than the above OFF
DOWN SW LEVER Selector lever is shifted to
− side ON
Other than the above OFF
UP SW LEVER Selector lever is shifted to + side ON
Other than the above OFF
NON M-MODE SW Selector lever is shifted to manual shift gate side OFF
Other than the above ON
MANU MODE SW Selector lever is shifted to manual shift gate side ON
Other than the above OFF
TOW MODE SW To w m o d e O N
Other than the above OFF
DS RANGE* Driving with DS mode ON
Other than the above OFF
1 POSITION SW* Selector lever in “1” position ON
Other than the above OFF
Item name Condition Value / Status (Approx.)
Revision: 2010 May2011 QX56

TM-90
< BASIC INSPECTION >[7AT: RE7R01B]
DIAGNOSIS AND REPAIR WORK FLOW
Symptoms
† Vehicle does not move ( † Any position † Particular position )
† No upshift ( † 1GR → 2GR † 2GR → 3GR † 3GR → 4GR † 4GR → 5GR † 5GR →
6GR † 6GR → 7GR)
† No downshift ( † 7GR → 6GR † 6GR → 5GR † 5GR → 4GR † 4GR → 3GR † 3GR →
2GR † 2GR → 1GR)
† Lock-up malfunction
† Shift point too high or too low
† Shift shock or slip
† Noise or vibration
† No kick down
† No pattern select
† Others
Frequency † All the time † Under certain conditions † Sometimes ( times a day)
Weather conditions † Not affected
Weather † Fine † Clouding † Raining † Snowing † Other ( )
Te m p . † Hot † Warm
† Cool † Cold †
Temp. [Approx. °C (
° F)]
Humidity † High † Middle † Low
Transmission conditions † Not affected
† Cold † During warm-up † After warm-up
† Engine speed ( rpm)
Road conditions † Not affected
† In town † In suburbs † Freeway † Off road (Up / Down)
Driving conditions † Not affected
† At starting † While idling † While engine racing † At racing †
While cruis-
ing
† While accelerating † While decelerating † While turning (Right / Left)
† Vehicle speed [ km/h ( MPH)]
Other conditions Question Sheet
Revision: 2010 May2011 QX56

A/T FLUID COOLERTM-97
< BASIC INSPECTION > [7AT: RE7R01B]
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A/T FLUID COOLER
CleaningINFOID:0000000006233276
Whenever an A/T is replaced, the A/ T fluid cooler mounted in the radiator must be inspected and cleaned.
Metal debris and friction material, if present, can becom e trapped in the A/T fluid cooler. This debris can con-
taminate the newly serviced A/T or, in severe cases, can bl ock or restrict the flow of ATF. In either case, mal-
function of the newly se rviced A/T may result.
Debris, if present, may build up as ATF enters the cooler inlet. It will be necessary to back flush the cooler
through the cooler outlet in order to flush out any built up debris.
CLEANING PROCEDURE
1. Position an oil pan under the A/T inlet and outlet cooler hoses.
2. Identify the inlet and outlet fluid cooler hoses.
3. Disconnect the A/T fluid cooler inlet and outlet rubber hoses
from the steel cooler tubes or by-pass valve.
NOTE:
Replace the cooler hoses if rubber material from the hose
remains on the tube fitting.
4. Allow any ATF that remains in the cooler hoses to drain into the oil pan.
5. Insert the extension adapter hose of a can of Transmission Cooler Cleaner (Nissan P/N 999MP-AM006) into the cooler out-
let hose.
CAUTION:
 Wear safety glasses and rubber gloves when spraying theTransmission Cooler Cleaner.
 Spray Transmission Cooler Cleaner only with adequate
ventilation.
 Avoid contact with eyes and skin.
 Never breath vapors or spray mist.
6. Hold the hose and can as high as possible and spray Transmis- sion Cooler Cleaner in a continuous stream into the cooler outlet
hose until ATF flows out of the cooler inlet hose for 5 seconds.
7. Insert the tip of an air gun into the end of the cooler outlet hose.
8. Wrap a shop rag around the air gun tip and of the cooler outlet hose.
9. Blow compressed air regulated to 5 to 9 kg/cm
2 (71 to 128 psi)
through the cooler outlet hose for 10 seconds to force out any
remaining ATF.
10. Repeat steps 5 through 9 three additional times.
11. Position an oil pan under the banjo bolts that connect the A/T fluid cooler steel lines to the A/T.
12. Remove the banjo bolts.
13. Flush each steel line from the cooler side back toward the A/T by spraying Transmission Cooler Cleaner in a continuous stream for 5 seconds.
14. Blow compressed air regulated to 5 to 9 kg/cm
2 (71 to 128 psi) through each steel line from the cooler
side back toward the A/T for 10 seconds to force out any remaining ATF.
15. Ensure all debris is removed from the steel cooler lines.
16. Ensure all debris is removed from the banjo bolts and fittings.
17. Perform “DIAGNOSIS PROCEDURE”.
JPDIA0711GB
JPDIA0712GB
JPDIA0713GB
Revision: 2010 May2011 QX56

TOW MODE SYSTEMTM-153
< DTC/CIRCUIT DIAGNOSIS > [7AT: RE7R01B]
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TOW MODE SYSTEM
Component Function CheckINFOID:0000000006226876
1.CHECK TOW MODE INDICATOR LAMP FUNCTION
1. Turn ignition switch ON.
2. Check that tow mode indicator lamp turn s ON/OFF when tow mode switch is operated.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to TM-153, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006226877
NOTE:
Tow mode switch is integrated in to SNOW MODE/T OW MODE/VDC OFF switch assembly (2WD models) or
4WD switch assembly (4WD models).
1.CHECK DTC OF TCM
With CONSULT-III
1. Turn ignition switch ON.
2. Perform “Self-Diagnostic Results” in “TRANSMISSION”.
Is any DTC detected?
YES >> Check DTC detect ed item. Refer to TM-78, "DTC Index".
NO >> GO TO 2.
2.CHECK DTC OF COMBINATION METER
With CONSULT-III
Perform “Self-Diagnostic Re sults” in “METER/M&A”.
Is any DTC detected?
YES >> Check DTC detect ed item. Refer to MWI-43, "DTC Index".
NO >> GO TO 3.
3.CHECK COMBINATION METER
With CONSULT-III
1. Select “TOW MODE IND” in “Data Monitor” in “METER/M&A”.
2. Check that “TOW MODE IND” turns ON/OFF when tow mode switch is operated.
Is the inspection result normal?
YES >> Replace combination meter. Refer to MWI-85, "Exploded View".
NO >> GO TO 4.
4.CHECK TOW MODE SWITCH SIGNAL
With CONSULT-III
1. Select “TOW MODE SW” in “Data Monitor” in “TRANSMISSION”.
2. Check that “TOW MODE SW” turns ON /OFF when tow mode switch is operated.
Is the inspection result normal?
YES >> Replace combination meter. Refer to MWI-85, "Exploded View".
NO >> GO TO 5.
5.CHECK TOW MODE SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assem-
bly connector (4WD models).
3. Turn ignition switch ON.
4. Check voltage between SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD
switch assembly connector (4WD models) vehicle side harness connector terminals.
Revision: 2010 May2011 QX56

TM-154
< DTC/CIRCUIT DIAGNOSIS >[7AT: RE7R01B]
TOW MODE SYSTEM
*1: 2WD models
*2: 4WD models
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 9.
6.CHECK TOW MODE SWITCH
Check tow mode switch. Refer to TM-155, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair or replace damaged parts.
7.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair or replace damaged parts.
8.CHECK TOW MODE SYSTEM
1. Replace the control valve & TCM. Refer to TM-182, "
Exploded View".
2. Reinstall any parts removed.
3. Check tow mode system. Refer to TM-153, "
Component Function Check".
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace combination meter. Refer to TM-182, "
Exploded View".
9.CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between SNOW MODE/TOW MODE/VDC OFF switch as sembly (2WD models) or 4WD
switch assembly connector (4WD models) vehicle side harness connector terminal and ground.
*1: 2WD models
*2: 4WD models
Is the inspection result normal?
YES >> GO TO 10.
NO >> Repair or replace damaged parts.
10.CHECK HARNESS BETWEEN SNOW MODE/TOW MODE/VDC OFF SWITCH ASSEMBLY (2WD MOD-
ELS) OR 4WD SWITCH ASSEMBLY (4WD MODELS) AND COMBINATION METER (PART 1)
1. Disconnect combination meter connector.
2. Check continuity between SNOW MODE/TOW MODE/VDC OFF switch as sembly (2WD models) or 4WD
switch assembly connector (4WD models) vehicl e side harness connector terminal and combination
meter vehicle side harness connector terminal.
SNOW MODE/TOW MODE/VDC OFF sw itch assembly (2WD models) or 4WD switch assembly
(4WD models) Voltage (Approx.)
Connector Te r m i n a l
+–
M54
*1
M147*223 20 Battery voltage
SNOW MODE/TOW MODE/VDC O FF switch assembly (2WD
models) or 4WD switch assembly (4WD models)
GroundContinuity
Connector Terminal
M54
*1
M147*220 Existed
Revision: 2010 May2011 QX56

TOW MODE SYSTEMTM-155
< DTC/CIRCUIT DIAGNOSIS > [7AT: RE7R01B]
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*1: 2WD models
*2: 4WD models
Is the inspection result normal?
YES >> GO TO 11.
NO >> Repair or replace damaged parts.
11 .CHECK HARNESS BETWEEN SNOW MODE/TOW MODE/VDC OFF SWITCH ASSEMBLY (2WD MOD-
ELS) OR 4WD SWITCH ASSEMBLY (4WD MODELS) AND COMBINATION METER (PART 2)
Check continuity between SNOW MODE/TOW MODE/V DC OFF switch assembly (2WD models) or 4WD
switch assembly connector (4WD models) vehicle side harness connector terminal and ground.
*1: 2WD models
*2: 4WD models
Is the inspection result normal?
YES >> GO TO 12.
NO >> Repair or replace damaged parts.
12.CHECK COMBINATION METER
1. Reconnect all the connectors.
2. Check combination meter input/output signal. Refer to MWI-35, "
Reference Value".
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI-40, "Intermittent Incident".
NO >> Replace combination meter. Refer to MWI-85, "
Exploded View".
Component InspectionINFOID:0000000006226878
NOTE:
Tow mode switch is integrated in to SNOW MODE/T OW MODE/VDC OFF switch assembly (2WD models) or
4WD switch assembly (4WD models).
1.CHECK TOW MODE SWITCH
Check continuity between SNOW MODE/TOW MODE/V DC OFF switch assembly (2WD models) or 4WD
switch assembly (4WD models) connector terminals.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace tow mode switch. Refer to TM-181, "
Removal and Installation".
SNOW MODE/TOW MODE/VDC OFF switch as-
sembly (2WD models) or 4WD switch assembly (4WD models) Combination meter
Continuity
Connector Terminal Connector Terminal M54
*1
M147*223 M34 7 Existed
SNOW MODE/TOW MODE/VDC OF F switch assembly (2WD
models) or 4WD switch assembly (4WD models)
GroundContinuity
Connector Terminal
M54
*1
M147*223 Not existed
SNOW MODE/TOW MODE/VDC OF F switch assembly (2WD
models) or 4WD switch assembly (4WD models) Condition Continuity
Te r m i n a l
23 20 Tow mode switch is depressed Existed
Tow mode switch is released Not existed
Revision: 2010 May2011 QX56

TOW MODE SWITCHTM-181
< REMOVAL AND INSTALLATION > [7AT: RE7R01B]
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TOW MODE SWITCH
Removal and InstallationINFOID:0000000006226898
NOTE:
Tow mode switch is integrated in to SNOW MODE/T OW MODE/VDC OFF switch assembly (2WD models) or
4WD switch assembly (4WD models).
REMOVAL
1. Remove console finisher assembly from center console assembly. Refer to IP-25, "Removal and Installa-
tion".
2. Disconnect SNOW MODE/TOW MODE /VDC OFF switch assembly (2WD models) or 4WD switch
assembly (4WD models) harness connector.
3. Press SNOW MODE/TOW MODE/VDC OFF switch a ssembly (2WD models) or 4WD switch assembly
(4WD models) fixing pawls, and remove SNOW MO DE/TOW MODE/VDC OFF switch assembly (2WD
models) or 4WD switch assembly (4WD models) from console finisher assembly.
INSTALLATION
Install in the reverse order of removal.
Revision: 2010 May2011 QX56