check engine INFINITI QX56 2008 Factory Service Manual

STALL TESTTM-185
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STALL TEST
Inspection and JudgmentINFOID:0000000001696156
A/T FLUID CHECK
Fluid Leakage and Fluid Level Check
• Inspect for fluid leakage and check the fluid level. Refer to TM-178, "Checking the A/T Fluid (ATF)".
Fluid Condition Check
Inspect the fluid condition.
STALL TEST
Stall Test Procedure
1. Inspect the amount of engine oil. Replenish the engine oil if necessary.
2. Drive for about 10 minutes to warm up the vehicle so that the A/
T fluid temperature is 50 to 80 °C (122 to 176 °F). Inspect the
amount of ATF. Replenish if necessary.
3. Securely engage the parking brake so that the tires do not turn.
Fluid condition Conceivable Cause Required Operation
Varnished (viscous
varnish state) Clutch, brake
scorchedReplace the ATF and check the A/T
main unit and the vehicle for mal-
functions (wire harnesses, cooler
pipes, etc.)
Milky white or
cloudy Water in the fluidReplace the ATF and check for plac-
es where water is getting in.
Large amount of
metal powder mixed
in Unusual wear of
sliding parts within
A/T
Replace the ATF and check for im-
proper operation of the A/T.
SAT638A
SAT647B
SCIA1224E
Revision: March 2010
2008 QX56

ROAD TESTTM-189
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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-190
< ON-VEHICLE MAINTENANCE >
ROAD TEST
YES >> Enter a check mark at “In “P” Position Vehicle Moves When Pushed” on the diagnostics work-sheet, then continue the road test.
NO >> GO TO 4.
4.CHECK “N” POSITION FUNCTIONS
1. Start the engine.
2. Move selector lever to “N” position.
3. Release the parking brake.
Does vehicle move forward or backward?
YES >> Enter a check mark at “In “N” Position Vehicle Moves” on the diagnostics worksheet, then con- tinue the road test.
NO >> GO TO 5.
5.CHECK SHIFT SHOCK
1. Engage the brake.
2. Move selector lever to “D” position.
When the transmission is shifted from
“N” to “D”, is there an excessive shock?
YES >> Enter a check mark at “Large Shock ("N" to "D" Position) on the diagnostics worksheet, then con-
tinue the road test.
NO >> GO TO 6.
6.CHECK “R” POSITION FUNCTIONS
1. Engage the brake.
2. Move selector lever to “R” position.
3. Release the brake for 4 to 5 seconds.
Does the vehicle creep backward?
YES >> GO TO 7.
NO >> Enter a check mark at “Vehicle Does Not Creep Backward In "R" Position” on the diagnostics
worksheet, then continue the road test.
7.CHECK “D” POSITION FUNCTIONS
Inspect whether the vehicle creeps forward when the transmission is put into the “D” position.
Does the vehicle creep forward in the
“D” positions?
YES >> Go to TM-190, "Cruise Test - Part 1", TM-192, "Cruise Test - Part 2", and TM-193, "Cruise Test -
Part 3".
NO >> Enter a check mark at “Vehicle Does Not Cr eep Forward in "D" Position” on the diagnostics work-
sheet, then continue the road test.
Cruise Test - Part 1INFOID:0000000001696161
1.CHECK STARTING OUT FROM D1
1. Drive the vehicle for about 10 minutes to warm up the engine oil and ATF. Appropriate temperature for the ATF: 50 - 80° C (122 - 176°F)
2. Park the vehicle on a level surface.
3. Move selector lever to “P” position.
4. Start the engine.
5. Move selector lever to “D” position.
6. Press the accelerator pedal about half way down to accelerate the vehicle.
With CONSULT-III
Read off the gear positions.
Starts from D1?
YES >> GO TO 2.
NO >> Enter a check mark at “Vehicle Cannot be St arted 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.
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
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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

TRANSMISSION ASSEMBLYTM-215
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8. Remove crankshaft position sens or (POS) from A/T assembly.
CAUTION:
• Do not subject it to impact by dropping or hitting it.
• Do not disassemble.
• Do not allow metal filings or foreign material to get on the
sensor front edge magnetic area.
• Do not place in an area affected by magnetism.
9. Remove fluid cooler tube.
10. Remove dust cover from converter housing.
11. Turn crankshaft to access and remove the four bolts for drive plate and torque converter.
CAUTION:
When turning crankshaft, turn it clockwise as viewed from
the front of the engine.
12. Support A/T assembly with a transmission jack. CAUTION:
When setting the transmission jack, be careful not to allow
it to collide agai nst the drain plug.
13. Remove cross member using power tool.
14. Remove air breather hose. Refer to TM-197, "
Removal and
Installation".
15. Disconnect A/T assembly connector.
16. Remove A/T fluid indicator pipe from A/T assembly.
17. Plug any openings such as the A/T fluid indicator pipe hole.
18. Remove the A/T assembly to engine bolts using power tool.
19. Remove A/T assembly from vehicle using transmission jack. CAUTION:
• Secure torque converter to prevent it from dropping.
• Secure A/T assembly to a transmission jack.
INSPECTION
Installation and Inspection of Torque Converter
• After inserting a torque converter to a transmission, be sure to check dimension A to ensure it is within specifications.
INSTALLATION
Installation of the remaining components is in the revers e order of the removal, while paying attention to the
following:
LCIA0334E
LCIA0335E
SCIA0499E
Dimension A : 24.0 mm (0.94 in) or more
SAT017B
Revision: March 2010 2008 QX56

TM-216
< REMOVAL AND INSTALLATION >
TRANSMISSION ASSEMBLY
• When installing transmission to the engine, attach the bolts in the order as shown.CAUTION:
• When replacing an engine or transmission you must make
sure the dowels are installe d correctly during re-assembly.
• Improper alignment caused by missing dowels may cause
vibration, oil leaks or breakage of drivetrain components.
NOTE:
*: No.2 bolt also secures air breather vent.
CAUTION:
• When turning crankshaft, turn it clockwi se as viewed from the front of the engine.
• After converter is installed to drive plate, rota te crankshaft several turns and check to be sure that
transmission rotates fr eely without binding.
NOTE:
• Align the positions of bolts for drive plate with those of the torque converter, and temporarily tighten the bolts. Then tighten the bolts
with the specified torque.
• Install crankshaft pos ition sensor (POS).
• After completing installation check fluid leakage, fluid level and the positions of A/T. Refer to TM-178, "
Checking the A/T Fluid (ATF)",
TM-194, "
Checking of A/T Position" and TM-194, "Adjustment of A/
T Position".
Removal and Installation (4WD)INFOID:0000000004917499
COMPONENTS
Transmission to engine bolts : 113 N·m (12 kg-m,
83 ft-lb)
LCIA0371E
LCIA0335E
Revision: March 2010 2008 QX56

TRANSMISSION ASSEMBLYTM-219
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• After inserting a torque converter to a transmission, be sure to check dimension A to ensure it is within specifications.
INSTALLATION
Installation of the remaining components is in the revers e order of removal, while paying attention to the fol-
lowing:
• When installing transmission to the engine, attach the bolts as shown.
CAUTION:
• When replacing an engine or transmission you must make sure the dowels are installed correctly during re-assembly.
• Improper alignment caused by missing dowels may cause
vibration, oil leaks or breakage of drivetrain components.
NOTE:
*: No.2 bolt also secures air breather vent.
• Align the positions of bolts for dr ive plate with those of the torque
converter, and temporarily tighten the bolts. Then tighten the bolts
with the specified torque.
CAUTION:
• When turning crankshaft, turn it clockwise as viewed from the
front of the engine.
• After converter is installed to drive plate, rotate crankshaft several turns and check to be sure that transmission rotates
freely without binding.
• Install crankshaft position sensor (POS).
• After completing installation, check fluid leakage, fluid level, and the positions of A/T. Refer to TM-178, "
Checking the A/T Fluid
(ATF)", TM-194, "Checking of A/T Position" and TM-194, "Adjustment of A/T Position".
Dimension A : 24.0 mm (0.94 in) or more
SAT017B
Transmission to engine bolts : 113 N·m (12 kg-m,
83 ft-lb)
LCIA0371E
LCIA0335E
Revision: March 2010 2008 QX56