2008 INFINITI QX56 Stop

TM-102
< COMPONENT DIAGNOSIS >
A/T SHIFT LOCK SYSTEM
• Check operation by applying battery voltage to key switch and igni-tion knob switch terminal 5 and ground to terminal 6.
CAUTION:
Be careful not to cause burnout of the component.
IGNITION KNOB SWITCH
• Check continuity between terminals of the key switch and ignition
knob switch.
STOP LAMP SWITCH
• Check continuity between stop lamp switch terminals 1 and 2.
Check stop lamp switch after adjusting brake pedal.
AWDIA0545ZZ
Condition Terminal No. Continuity
Switch pushed 1 - 2Ye s
Switch released No
AWDIA0546ZZ
ConditionTerminal No. Continuity
When brake pedal is depressed 1 -2Ye s
When brake pedal is released No
AWDIA0165ZZ
Revision: March 2010 2008 QX56

TCM
TM-115
< ECU DIAGNOSIS >
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Even when the electronic circuits are normal, under s pecial conditions (for example, when slamming on the
brake with the wheels spinning drastically and stopping the tire rotation), the transmission can go into fail-safe
mode. If this happens, switch “OFF” the ignition switch for 10 seconds, then switch it “ON” again to return to
the normal shift pattern. Therefore, the customer's vehicle has returned to normal, so handle according to the
“diagnostics flow” (Refer to TM-5, "
Work Flow").
FAIL-SAFE FUNCTION
If any malfunction occurs in a sensor or solenoid, th is function controls the A/T to mark driving possible.
Output Speed Sensor
• Signals are input from two systems - from output s peed sensor installed on the transmission and from com-
bination meter so normal driving is possible even if t here is a malfunction in one of the systems. And if output
speed sensor has unusual cases, 5GR is prohibited.
Accelerator Pedal Position Sensor
• If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM according
to a pre-determined accelerator angle to make driving possible. And if there are malfunctions in tow sys-
tems, the engine speed is fixed by ECM to a pre-determined engine speed to make driving possible.
Throttle Position Sensor
• If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM according
to a pre-determined accelerator angle to make driving possible. And if there are malfunctions in tow sys-
tems, the accelerator opening angle is controlled by the idle signal sent from the ECM which is based on
input indicating either idle condition or off-idle condition (pre-determined accelerator opening) in order to
make driving possible.
Transmission Range Switch
• In the unlikely event that a malfunction signal enters t he TCM, the position indicator is switched “OFF”, the
starter relay is switched “OFF” (starter starting is disabled), the back-up lamp relay switched “OFF” (back-up
lamp is OFF) and the position is fixed to the “D” range to make driving possible.
Starter Relay
• The starter relay is switched “OFF”. (Starter starting is disabled.)
Interlock
• If there is an interlock judgment malfunction, the tr ansmission is fixed in 2GR to make driving possible.
NOTE:
When the vehicle is driven fixed in 2GR, a inpu t speed sensor malfunction is displayed, but this is
not a input speed sensor malfunction.
• When the interlock is detected at the 3GR or more, it is locked at the 2GR.
1st Engine Braking
• When there is an 1st 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 1GR and 2GR.
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 4GR 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 5GR; if the solenoid is OFF, 4GR.
Revision: March 2010 2008 QX56

TM-180
< ON-VEHICLE MAINTENANCE >
A/T FLUID
Changing the A/T Fluid (ATF)
INFOID:0000000004917425
CAUTION:
If using the vehicle for towing, the A/T fl uid must be replaced as specified. Refer to MA-8, "
Introduc-
tion of Periodic Maintenance".
1. Drive the vehicle to warm up the A/T fluid to approximately 80 ° C (176 ° F).
2. Stop the engine.
3. Remove the A/T fluid level gauge.
4. Drain the A/T fluid from the drain plug hole, then install the drain plug with a new gasket. Refill the transmission with new A/T
fluid. Always refill with the same volume as the drained A/T fluid.
Use the A/T fluid level gauge to check the A/T fluid level as
shown. Add A/T fluid as necessary.
• To flush out the old A/T fluid from the transmission oil coolers, pour new A/T fluid into the A/T fluid charg-
ing pipe with the engine idling and at the same time drain the old A/T fluid from the auxiliary transmis-
sion oil cooler hose return line.
• When the color of the A/T fluid coming out of the auxiliary transmission oil cooler hose return line is
about the same as the color of the new A/T fluid, flushing out the old A/T fluid is complete. The amount
of new A/T fluid used for flushing should be 30% to 50% increase of the specified capacity.
CAUTION:
• Use only Genuine NISSAN Matic J ATF and do not mix with other fluids.
• Using A/T fluid other than Genuine NISSAN Mati c J ATF will cause deterioration in driveability
and automatic transmission durability, and may damage the automatic transmission, which is
not covered by the warranty.
• When filling the transmission with A/T fluid, do not spill the A/T fluid on any heat generating parts such as the exhaust manifold.
• Do not reuse the drain plug gasket.
5. Install the A/T fluid level gauge and tighten the A/T fluid level gauge bolt to specification.
6. Drive the vehicle to warm up the A/T fluid to approximately 80 ° C (176 ° F).
7. Check the fluid level and condition. If the A/T fluid is still dirty, repeat steps 2 through 6.
8. Install the A/T fluid level gauge in the A/T fluid charging pipe and install the A/T fluid level gauge bolt.
9. Tighten the A/T fluid level gauge bolt to specification. Drain plug : Refer to
TM-220, "
Component".
LLIA0071E
A/T fluid grade and capacity : Refer to MA-12, "Fluids and Lubricants".
A/T fluid level
gauge bolt : Refer to TM-214, "
Removal and Installation (2WD)" or TM-216, "Removal and
Installation (4WD)".
LLIA0071E
Revision: March 2010
2008 QX56

ROAD TESTTM-189
< ON-VEHICLE MAINTENANCE >
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ROAD TEST
DescriptionINFOID:0000000001696158
ROAD TEST
• The road test inspects overall performance of the A/T and analyzes possible malfunction causes.
• The road test is carried out in the following three stages.
1. Check before engine is started. Refer to TM-189
.
2. Check at idle. Refer to TM-189
.
3. Cruise test • Inspect all the items from Part 1 to Part 3. Refer to TM-190
, TM-192, TM-193.
• Before beginning the road test, check the test procedure and inspection items.
• Test all inspection items until the symptom is uncov ered. Diagnose NG items when all road tests are com-
plete.
Check Before Engine Is StartedINFOID:0000000001696159
1.CHECK AT CHECK INDICATOR LAMP
1. Park vehicle on level surface.
2. Move selector lever to “P” position.
3. Turn ignition switch to “OFF” position and wait at least 10 seconds.
4. Turn ignition switch to “ON” position. (Do not start engine.)
Does AT CHECK indicator lamp light up for about 2 seconds?
YES >> 1. Turn ignition switch to “OFF” position. 2. Carry out the self-diagnostics and record all NG items on the diagnostics worksheet. Refer toTM-32, "
CONSULT-III Function (TRANSMISSION)".
3. Go to TM-189, "
Check At Idle".
NO >> Stop the road test and go to TM-118, "
A/T Check Indicator Lamp Does Not Come On".
Check At IdleINFOID:0000000001696160
1.CHECK STARTING THE ENGINE
1. Park vehicle on level surface.
2. Move selector lever to “P” or “N” position.
3. Turn ignition switch to “OFF” position.
4. Turn ignition switch to “START” position.
Does the engine start?
YES >> GO TO 2.
NO >> Stop the road test and go to TM-118, "
Engine Cannot Be Started in "P" or "N" Position".
2.CHECK STARTING THE ENGINE
1. Turn ignition switch to “ON” position.
2. Move selector lever in “D”,“4”, “3”, “2”, “1” or “R” position.
3. Turn ignition switch to “START” position.
Does the engine start in either position?
YES >> Stop the road test and go to TM-118, "Engine Cannot Be Started in "P" or "N" Position".
NO >> GO TO 3.
3.CHECK “P” POSITION FUNCTIONS
1. Move selector lever to “P” position.
2. Turn ignition switch to “OFF” position.
3. Release the parking brake.
4. Push the vehicle forward or backward.
5. Engage the parking brake.
When you push the vehicle with disengaging the parking brake, does it move?
Revision: March 2010 2008 QX56

TM-192
< ON-VEHICLE MAINTENANCE >
ROAD TEST
NO >> Enter a check mark at “A/T Does Not Hold Lock-up Condition” on the diagnostics worksheet, thencontinue the road test.
8.CHECK LOCK-UP RELEASE
Check lock-up cancellation by depressing brake pedal lightly to decelerate. With CONSULT-III
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-III
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 58).
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 58).
Cruise Test - Part 2INFOID:0000000001696162
1.CHECK STARTING FROM D1
1. Move selector lever the “D” position.
2. Accelerate at half throttle. With CONSULT-III
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 ins pect whether or not the transmission shifts up (D1 → D2)
at the correct speed.
• Refer to TM-291, "
Vehicle Speed at Which Gear Shifting Occurs".
With CONSULT-III
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 ins pect whether or not the transmission shifts up (D2 → D3)
at the correct speed.
• Refer to TM-291, "
Vehicle Speed at Which Gear Shifting Occurs".
With CONSULT-III
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
Revision: March 2010 2008 QX56

ROAD TESTTM-193
< ON-VEHICLE MAINTENANCE >
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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 TM-193, "
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:0000000001696163
1.CHECK SHIFT-DOWN
During D
5 driving, move gear selector from D → 4 → 3 → 2 → 1.
With CONSULT-III
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 TM-32, "
CONSULT-III Function (TRANSMISSION)".
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:0000000001696164
Refer to TM-193, "Vehicle Speed When Shifting Gears".
Vehicle Speed When Performing and Releasing Complete Lock-upINFOID:0000000001696165
Refer to TM-193, "Vehicle Speed When Performing and Releasing Complete Lock-up".
Revision: March 2010 2008 QX56

TM-194
< ON-VEHICLE MAINTENANCE >
A/T POSITION
A/T POSITION
Checking of A/T PositionINFOID:0000000004917429
With the shift selector in the “P” position, turn the ignition switch to the ON position with the engine OFF.
Confirm that the following conditions apply.
• The shift selector can be shifted from the “P ” position only when the brake pedal is depressed.
• The shift selector stops at each position with the feel of engagement when it is moved through all the posi-
tions.
• There is no excessive effort, sticking, noise or rattle.
• The actual position of the shift selector matches the position shown by the shift position indicator and the A/
T body.
• The back-up lamps illuminate only when the shift selector is placed in the “R” position.
• The back-up lamps do not illuminate when the shift selector is pushed against the “R” position when in the
“P” or “N” position.
• The engine can only be started with the shift selector in the “P” and “N” positions.
• The A/T is locked completely when in the “P” position.
Adjustment of A/T PositionINFOID:0000000004917428
1. Loosen nut of control cable.
2. Place the transmission range switch and shift selector in “P”
position.
3. Push the control cable in the di rection shown with a force of 9.8
N (1kg, 2.2 lb), and release it. This is in the natural state, tighten
control cable nut to specifications.
Control cable nut : 14.5 N·m (1.5 kg-m, 11 ft-lb)
SCIA6532E
Revision: March 2010 2008 QX56

TM-196
< ON-VEHICLE REPAIR >
SHIFT CONTROL SYSTEM
Checking of A/T Position
INFOID:0000000004917432
1. Place shift selector in “P” position, and turn ignition switch ON (engine stop).
2. Make sure shift selector can be shifted to other than “P” position when brake pedal is depressed. Also make sure shift selector
can be shifted from “P” position only when brake pedal is
depressed.
3. Move the shift selector and check for excessive effort, sticking, noise or rattle.
4. Confirm the shift selector stop s at each position with the feel of
engagement when it is moved through all the positions. Check
whether or not the actual position the shift selector is in matches
the position shown by the shift position indicator and the trans-
mission body.
5. The method of operating the shift selector to individual positions correctly should be as shown.
6. Confirm the back-up lamps illuminate only when shift sele ctor is placed in the “R” position. Confirm the
back-up lamps does not illuminate when shift selector is pushed against “R” position in the “P” or “N” posi-
tion.
7. Confirm the engine can only be started with the shift selector in the “P” and “N” positions.
8. Make sure transmission is locked completely in “P” position.
Adjustment of A/T PositionINFOID:0000000004917431
1. Loosen nut of control cable.
2. Place transmisson range switch and shift selector in “P” position.
3. After pushing the control cable in the direction shown with a force of 9.8 N·m (1kg-m, 2.2 ft-lb), release it. This is in the natu-
ral state, tighten control cable nut to specifications.
LCIA0325E
Control cable nut : 14.5 N·m (1.5 kg-m, 11 ft-lb)
LCIA0345E
Revision: March 2010 2008 QX56