2011 INFINITI QX56 stop start

DLN-106
< PERIODIC MAINTENANCE >[TRANSFER: ATX90A]
TRANSFER FLUID
PERIODIC MAINTENANCE
TRANSFER FLUID
InspectionINFOID:0000000006222324
FLUID LEAKAGE
Check transfer surrounding area (oil seal, drain plug, and filler plug etc.) for fluid leakage.
FLUID LEVEL
1. Remove filler plug (1) and gasket. Then check that fluid is filled
up from mounting hole for the filler plug.
CAUTION:
Never start engine whil e checking fluid level.
2. Set a new gasket onto filler plug (1), and install it on transfer and then tighten to the specified torque.
CAUTION:
Never reuse gasket.
DrainingINFOID:0000000006222325
1. Run the vehicle to warm up the transfer unit sufficiently.
2. Stop the engine.
3. Remove the drain plug (1) and drain transfer fluid.
4. Set a new gasket onto drain plug (1), and install it to transfer andtighten to the specified torque.
CAUTION:
Never reuse gasket.
RefillingINFOID:0000000006222326
1. Remove filler plug (1). Fill up with new transfer fluid up to mount-ing hole for the filler plug.
CAUTION:
Carefully fill the fluid. (Fill up for approximately 3 minutes.)
2. Leave the vehicle for 3 minutes, and check the fluid level again.
3. Set a new gasket onto filler plug, and install it on transfer and tighten to the specified torque.
CAUTION:
Never reuse gasket.
4. Perform learning of transfer fluid viscosity. Refer to DLN-47, "
Work Procedure".
Specified torque : 33 N·m (3.4 kg-m, 24 ft-lb)
JPDIE0295ZZ
Specified torque : 33 N-m (3.4 kg-m, 24 ft-lb)
JPDIE0245ZZ
Fluid grade and Viscosity : Refer to
MA-10, "Fluids
and Lubricants".
Fluid capacity : Refer to DLN-124, "
Gen-
eral Specifications".
Specified torque : 33 N-m (3.4 kg-m, 24 ft-lb)
JPDIE0295ZZ
Revision: 2010 May2011 QX56

FRONT DIFFERENTIAL GEAR OILDLN-155
< PERIODIC MAINTENANCE > [FRONT FINAL DRIVE: R180A]
C
EF
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DLN
N
O P
PERIODIC MAINTENANCE
FRONT DIFFERENTIAL GEAR OIL
InspectionINFOID:0000000006222378
OIL LEAKAGE
Check that oil is not leaking from the front final drive assembly or around it.
OIL LEVEL
 Remove filler plug (1) and check oil level from filler plug mounting
hole as shown in the figure.
CAUTION:
Never start engine while checking oil level.
 Set a gasket on filler plug (1) and install it on final drive assembly. Refer to DLN-167, "
Exploded View".
CAUTION:
Never reuse gasket.
DrainingINFOID:0000000006222379
1. Stop engine.
2. Remove drain plug (1) and drain gear oil.
3. Set a gasket on drain plug (1) and install it to final drive assem- bly and tighten to the specified torque. Refer to DLN-167,
"Exploded View".
CAUTION:
Never reuse gasket.
RefillingINFOID:0000000006222380
1. Remove filler plug (1). Fill with new gear oil until oil level reaches the specified level near filler plug mounting hole.
2. After refilling oil, check oil level. Set a gasket to filler plug (1), then install it to final drive assembly. Refer to DLN-167,
"Exploded View".
CAUTION:
Never reuse gasket.
JPDID0312ZZ
JPDID0313ZZ
Oil grade and Viscosity : Refer to MA-10, "Fluids
and Lubricants".
Oil capacity : Refer to DLN-185, "
Gen-
eral Specifications".
JPDID0312ZZ
Revision: 2010 May2011 QX56

REAR DIFFERENTIAL GEAR OILDLN-193
< PERIODIC MAINTENANCE > [REAR FINAL DRIVE: R230]
C
EF
G H
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M A
B
DLN
N
O P
PERIODIC MAINTENANCE
REAR DIFFERENTIAL GEAR OIL
InspectionINFOID:0000000006222411
OIL LEAKAGE
Check that differential gear oil is not leaking fr om the rear final drive assembly or around it.
OIL LEVEL
 Remove filler plug (1) and check oil level from filler plug mounting
hole as shown in the figure.
CAUTION:
Never start engine while checking oil level.
 Set a gasket on filler plug (1) and install it on final drive assembly. Refer to DLN-203, "
Exploded View".
CAUTION:
Never reuse gasket.
DrainingINFOID:0000000006222412
1. Stop the engine.
2. Remove drain plug (1) and drain gear oil.
3. Set a gasket on drain plug (1) and install it to final drive assem- bly and tighten to the specified torque. Refer to DLN-203,
"Exploded View".
CAUTION:
Never reuse gasket.
RefillingINFOID:0000000006222413
1. Remove filler plug (1). Fill with new gear oil until oil level reaches the specified level near filler plug mounting hole.
2. After refilling oil, check oil level. Set a gasket to filler plug (1), then install it to final drive assembly. Refer to DLN-203,
"Exploded View".
CAUTION:
Never reuse gasket.
JPDID0415ZZ
JPDID0392ZZ
Oil grade and viscosity : Refer to MA-10, "Fluids and
Lubricants".
Oil capacity : Refer to DLN-222, "
General
Specification".
JPDID0415ZZ
Revision: 2010 May2011 QX56

EC-38
< SYSTEM DESCRIPTION >[VK56VD]
SYSTEM
Homogeneous combustion is a combustion method that fuel
is injected during intake process so that combus-
tion occurs in the entire combustion chamber , as is common with conventional methods.
As for a start except for starts with the engine cold, homogeneous combustion occurs.
MIXTURE RATIO FEEDBACK CONTROL (CLOSED LOOP CONTROL)
The mixture ratio feedback system prov ides the best air-fuel mixture ratio for driveability and emission control.
The three way catalyst (manifold) can better reduce CO , HC and NOx emissions. This system uses A/F sen-
sor 1 in the exhaust manifold to monitor whether the engine operation is rich or lean. The ECM adjusts the
injection pulse width according to the sensor voltage signal. For more information about A/F sensor 1, refer to
EC-21, "
Air Fuel Ratio (A/F) Sensor 1". This maintains the mixture ratio within the range of stoichiometric
(ideal air-fuel mixture).
This stage is referred to as the closed loop control condition.
Heated oxygen sensor 2 is located downstream of the th ree way catalyst (manifold). Even if the switching
characteristics of A/F sensor 1 shift, the air-fuel ratio is controlled to stoichiometric by the signal from heated
oxygen sensor 2.
 Open Loop Control
The open loop system condition refers to when the ECM detects any of the following conditions. Feedback
control stops in order to maintain stabilized fuel combustion.
- Deceleration and acceleration
- High-load, high-speed operation
- Malfunction of A/F sensor 1 or its circuit
- Insufficient activation of A/F sensor 1 at low engine coolant temperature
- High engine coolant temperature
- During warm-up
- After shifting from N to D
- When starting the engine
MIXTURE RATIO SELF-LEARNING CONTROL
The mixture ratio feedback control system monitors t he mixture ratio signal transmitted from A/F sensor 1.
This feedback signal is then sent to the ECM. The ECM c ontrols the basic mixture ratio as close to the theoret-
ical mixture ratio as possible. However, the basic mi xture ratio is not necessarily controlled as originally
designed. Both manufacturing differences (i.e., mass ai r flow sensor hot wire) and characteristic changes dur-
ing operation (i.e., fuel injector clogging) directly affect mixture ratio.
Accordingly, the difference between the basic and theoretical mixture ratios is monitored in this system. This is
then computed in terms of “injection pulse duration” to automatically compensate for the difference between
the two ratios.
“Fuel trim” refers to the feedback compensation value co mpared against the basic injection duration. Fuel trim
includes “short-term fuel trim” and “long-term fuel trim”.
“Short term fuel trim” is the short-term fuel compensati on used to maintain the mixture ratio at its theoretical
value. The signal from A/F sensor 1 indicates whether the mixture ratio is RICH or LEAN compared to the the-
oretical value. The signal then triggers a reduction in fuel volume if the mixture ratio is rich, and an increase in
fuel volume if it is lean.
“Long-term fuel trim” is overall fuel compensation carri ed out over time to compensate for continual deviation
of the “short-term fuel trim” from the central value. Continual deviation will occur due to individual engine differ-
ences, wear over time and changes in the usage environment.
FUEL INJECTION TIMING
Sequential Direct Injection Gasoline System
PBIB2793E
Revision: 2010 May2011 QX56

EC-64
< SYSTEM DESCRIPTION >[VK56VD]
DIAGNOSIS SYSTEM (ECM)
*: This function is not necessary
in the usual service procedure.
SELF-DIAG RESULTS MODE
Self Diagnostic Item
Regarding items of DTC and 1st trip DTC, refer to EC-98, "DTC Index".
How to Read DTC and 1st Trip DTC
DTCs and 1st trip DTCs related to the malfunction are displayed in “Self-diag results”.
 When ECM detects a 1st trip DTC, “1t” is displayed for “TIME”.
 When ECM has detected a current DTC, “0” is displayed for “TIME”.
 If “TIME” is neither “0” nor “1t”, the DTC occurred in the past and ECM shows the number of times the vehi-
cle has been driven since the last detection of the DTC.
How to Erase DTC and 1st Trip DTC
NOTE:
 If the ignition switch stays ON after repair work, be su re to turn ignition switch OFF once. Wait at least 10
seconds and then turn it ON (engine stopped) again.
 If the DTC is not for A/T related items (see EC-98, "
DTC Index"), skip step 1.
1. Erase DTC in TCM. Refer to TM-60, "
Diagnosis Description".
2. Select “ENGINE” with CONSULT-III.
3. Select “SELF-DIAG RESULTS”.
4. Touch “ERASE”. (DTC in ECM will be erased.)
WORK ITEM CONDITION USAGE
IDLE AIR VOL LEARN  THE IDLE AIR VOLUME THAT KEEPS THE ENGINE
WITHIN THE SPECIFIED RANGE IS MEMORIZED IN
ECM. When learning the idle air volume
EVAP SYSTEM CLOSE CLOSE THE EVAP CANISTER VENT CONTROL VALVE IN
ORDER TO MAKE EVAP SYSTEM CLOSE UNDER THE
FOLLOWING CONDITIONS.
 IGN SW ON
 ENGINE NOT RUNNING
 AMBIENT TEMPERATURE IS ABOVE 0
°C (32 °F).
 NO VACUUM AND NO HIGH PRESSURE IN EVAP SYS-
TEM
 FUEL TANK TEMP. IS MORE THAN 0 °C (32 °F).
 WITHIN 10 MINUTES AFTER STARTING “EVAP SYS-
TEM CLOSE”
 WHEN TRYING TO EXECUTE “EVAP SYSTEM CLOSE” UNDER THE CONDITION EXCEPT ABOVE, CONSULT-
III WILL DISCONTINUE IT AND DISPLAY APPROPRI-
ATE INSTRUCTION.
NOTE:
WHEN STARTING ENGINE, CONSULT-III MAY DIS-
PLAY “BATTERY VOLTAGE IS LOW. CHARGE BAT-
TERY”, EVEN WHEN USING A CHARGED BATTERY. When detecting EVAP vapor leak
in the EVAP system
FUEL PRESSURE RELEASE  FUEL PUMP WILL STOP BY TOUCHING “START” DUR-
ING IDLING.
CRANK A FEW TIMES AFTER ENGINE STALLS. When releasing fuel pressure from
fuel line
SELF-LEARNING CONT  THE COEFFICIENT OF SELF-LEARNING CONTROL
MIXTURE RATIO RETURNS TO THE ORIGINAL COEF-
FICIENT. When clearing mixture ratio self-
learning value
TARGET IDLE RPM ADJ*  IDLE CONDITION When setting target idle speed
VIN REGISTRATION  IN THIS MODE, VIN IS REGISTERED IN ECM. When registering VIN in ECM
TARGET IGN TIM ADJ*  IDLE CONDITION When adjusting target ignition tim-
ing
CLSD THL POS LEARN  IGNITION ON AND ENGINE STOPPED. When learning the throttle valve
closed position
VVEL POS SEN ADJ PREP  USE THIS ITEM ONLY WHEN REPLACING VVEL ACTU-
ATOR SUB ASSEMBLY.
 IGNITION ON AND ENGINE STOPPED. When adjusting VVEL control
shaft position sensor
Revision: 2010 May2011 QX56

EC-66
< SYSTEM DESCRIPTION >[VK56VD]
DIAGNOSIS SYSTEM (ECM)
A/F ALPHA-B1
% The mean value of the air-fuel ratio feedback cor-
rection factor per cycle is indicated.  When the engine is stopped,
a certain value is indicated.
 This data also includes the data for the air-fuel ratio
learning control.
 When engine is running, specification range is indicat-
ed in “SPEC”.
A/F ALPHA-B2
COOLAN TEMP/S
°C or °F  The engine coolant temperature (determined by
the signal voltage of the engine coolant tempera-
ture sensor) is displayed.  When the engine coolant
temperature sensor is open
or short-circuited, ECM en-
ters fail-safe mode. The en-
gine coolant temperature
determined by the ECM is
displayed.
A/F SEN1 (B1) V The A/F signal computed from the input signal of
the air fuel ratio (A/F) sensor 1 is displayed.
A/F SEN1 (B2)
HO2S2 (B1)
V The signal voltage of the heated oxygen sensor 2
is displayed.
HO2S2 (B2)
HO2S2 MNTR (B1)
RICH/LEAN Display of heated oxygen sensor 2 signal:
RICH: means the amount of oxygen after three
way catalyst is relatively small.
LEAN: means the amount of oxygen after three
way catalyst is relatively large.  When the engine is stopped,
a certain value is indicated.
HO2S2 MNTR (B2)
VHCL SPEED SE km/h or mph  The vehicle speed computed from the vehicle
speed signal sent from combination meter is dis-
played.
BATTERY VOLT V  The power supply voltage of ECM is displayed.
ACCEL SEN 1
V The accelerator pedal position sensor signal volt-
age is displayed.  ACCEL SEN 2 signal is con-
verted by ECM internally.
Thus, they differs from ECM
terminal voltage signal.
ACCEL SEN 2
TP SEN 1-B1
V The throttle position sensor signal voltage is dis-
played.  TP SEN 2-B1 signal is con-
verted by ECM internally.
Thus, they differs from ECM
terminal voltage signal.
TP SEN 2-B1
FUEL T/TMP SE
°C or °F  The fuel temperature (determined by the signal
voltage of the fuel tank temperature sensor) is dis-
played.
EVAP SYS PRES V  The signal voltage of EVAP control system pres-
sure sensor is displayed.
FUEL LEVEL SE V  The signal voltage of the fuel level sensor is dis-
played.
START SIGNAL ON/OFF  Indicates start signal status [ON/OFF] computed
by the ECM according to the signals of engine
speed and battery voltage.  After starting the engine,
[OFF] is displayed regard-
less of the starter signal.
CLSD THL POS ON/OFF  Indicates idle position [ON/OFF] computed by
ECM according to the accelerator pedal position
sensor signal.
AIR COND SIG ON/OFF  Indicates [ON/OFF] condition of the air conditioner
switch as determined by the air conditioner signal.
PW/ST SIGNAL ON/OFF  [ON/OFF] condition of the power steering system
(determined by the signal voltage of the power
steering pressure sensor signal) is indicated.
Monitored item Unit Description Remarks
Revision: 2010 May2011 QX56

ECM
EC-73
< ECU DIAGNOSIS INFORMATION > [VK56VD]
C
D
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EC
NP
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TP SEN 1-B1
 Ignition switch: ON
(Engine stopped)
 Selector lever: D position Accelerator pedal: Fully released More than 0.36 V
Accelerator pedal: Fully depressed Less than 4.75 V
TP SEN 2-B1*
1 Ignition switch: ON (Engine stopped)
 Selector lever: D position Accelerator pedal: Fully released More than 0.36 V
Accelerator pedal: Fully depressed Less than 4.75 V
FUEL T/TMP SE  Ignition switch: ON Indicates fuel tank tempera-
ture
EVAP SYS PRES  Ignition switch: ON Approx. 1.8 - 4.8 V
FUEL LEVEL SE  Ignition switch: ON Depending on fuel level of
fuel tank
START SIGNAL  Ignition switch: ON → START → ON OFF → ON → OFF
CLSD THL POS  Ignition switch: ON
(Engine stopped) Accelerator pedal: Fully released ON
Accelerator pedal: Slightly depressed OFF
AIR COND SIG  Engine: After warming up, idle
the engine Air conditioner switch: OFF OFF
Air conditioner switch: ON
(Compressor operates.)
ON
PW/ST SIGNAL  Engine: After warming up, idle
the engine Steering wheel: Not being turned OFF
Steering wheel: Being turned ON
LOAD SIGNAL  Ignition switch: ON Rear window defogger switch: ON
and/or
Lighting switch: 2nd position
ON
Rear window defogger switch and lighting
switch: OFF OFF
IGNITION SW  Ignition switch: ON → OFF → ON ON → OFF → ON
HEATER FAN SW  Engine: After warming up, idle
the engine Heater fan switch: ON ON
Heater fan switch: OFF OFF
BRAKE SW  Ignition switch: ON Brake pedal: Fully released OFF
Brake pedal: Slightly depressed ON
IGN TIMING  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle 1 - 4
°BTDC
2,000 rpm 25 - 45 °BTDC
COMBUSTION — These items are displayed
but are not applicable to this
model.
CAL/LD VALUE  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle 5 - 35%
2,500 rpm 5 - 35%
MASS AIRFLOW  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle 2.0 - 6.0 g/s
2,500 rpm 7.0 - 20.0 g/s
PURG VOL C/V  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle
(Accelerator pedal: Not depressed even
slightly, after engine starting.)
0%
2,000 rpm 5%
INT/V SOL (B1)  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle 0 - 2%
2,000 rpm Approx. 0 - 50%
Monitor Item Condition Values/Status
Revision: 2010 May2011 QX56

ECM
EC-83
< ECU DIAGNOSIS INFORMATION > [VK56VD]
C
D
E
F
G H
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EC
NP
O
48
(L/W) 175
(B) A/F sensor 1 heater (bank 1) Input [Engine is running]
 Warm-up condition
 Idle speed
(More than 140 seconds after start-
ing engine) 2.9 - 8.8 V
49
(LG/
B) 175
(B) Intake valve timing control sole-
noid valve (bank 1)
Output[Engine is running]
 Warm-up condition
 Idle speed
BATTERY VOLTAGE
(11 - 14 V)
[Engine is running]
 Warm-up condition
 Engine speed: 2,000rpm 7 - 12 V
51
(R) 175
(B) Fuel injector driver power supply Output [Engine is running]
 Warm-up condition
 Idle speed
BATTERY VOLTAGE
(11 - 14 V)
[Ignition switch: OFF] 1.5 V
52
(L/R) 175
(B) Heated oxygen sensor 2 heater
(bank 2)
Output[Engine is running]
 Engine speed: Below 3,600 rpm af-
ter the following conditions are met
- Engine: after warming up
- Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute
and at idle for 1 minute under no
load 10 V
[Ignition switch: ON]
 Engine: Stopped
[Engine is running]
 Engine speed: Above 3,600 rpm BATTERY VOLTAGE
(11 - 14 V)
53
(SB) 175
(B) A/F sensor 1 heater (bank 2) Output [Engine is running]
 Warm-up condition
 Idle speed
(More than 140 seconds after start-
ing engine) 2.9 - 8.8 V
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
JPBIA3361ZZ
JMBIA0038GB
JMBIA0037GB
JPBIA3361ZZ
Revision: 2010 May2011 QX56