2011 INFINITI QX56 Factory Service Manual

change wheel air suspension headrest fuel fuel tank capacity battery replacement

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INFINITI QX56 2011 Factory Service Manual
DIAGNOSIS SYSTEM (ECM)EC-65
< SYSTEM DESCRIPTION > [VK56VD]
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Freeze Frame Data and 1st Trip Freeze Frame Data
*: The items are the same as those of 1st trip freeze fram

DIAGNOSIS SYSTEM (ECM)EC-65
< SYSTEM DESCRIPTION > [VK56VD]
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Freeze Frame Data and 1st Trip Freeze Frame Data
*: The items are the same as those of 1st trip freeze frame data.
DATA MONITOR MODE
Monitored Item
×
: Applicable
Freeze frame data
item* Description
DIAG TROUBLE
CODE
[PXXXX] The engine control compon
ent part/control system has a trouble code the is displayed as PXXXX. (Refer to
EC-98, "
DTC Index".)
CAL/LD VALUE [%] The calculated load value at the moment a malfunction is detected is displayed.
COOLANT TEMP [ °C]
or [ °F] The engine coolant temperature at the moment a malfunction is detected is displayed.
L-FUEL TRM-B1 [%] “Long-term fuel trim” at the moment a malfunction is detected is displayed.
The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule than short-term fuel trim.
L-FUEL TRM-B2 [%]
S-FUEL TRM-B1 [%] “Short-term fuel trim” at the moment a malfunction is detected is displayed.
The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel sched-ule.
S-FUEL TRM-B2 [%]
ENGINE SPEED [rpm] The engine
speed at the moment a malfunction is detected is displayed.
VEHICL SPEED
[km/h] or [mph] The vehicle speed at the moment a malfunction is detected is displayed.
INT MANI PRES [kPa] These items are displayed but are not applicable to this model.
ABSOL TH·P/S [%] The throttle valve opening angle at the moment a malfunction is detected is displayed.
B/FUEL SCHDL
[msec] The base fuel schedule at the moment a malfunction is detected is displayed.
INT/A TEMP SE [ °C]
or [ °F] The intake air temperature at the moment a malfunction is detected is displayed.
FUEL SYS-B1 “Fuel injection system status” at the moment a malfunction is detected is displayed. One of the following mode is displayed.
Mode2: Open loop due to detected system malfunction
Mode3: Open loop due to driving conditions (power enrichment, deceleration enleanment)
Mode4: Closed loop - using oxygen sensor(s) as feedback for fuel control
Mode5: Open loop - has not yet satisfied condition to go to closed loop
FUEL SYS-B2
COMBUST CONDI-
TION
These items are displayed but are not applicable to this model.
Monitored item Unit Description Remarks
ENG SPEED rpm Indicates the engine speed computed from the sig-
nal of the crankshaft position sensor and camshaft
position sensor. Accuracy becomes poor if
engine speed drops below
the idle rpm.
If the signal is interrupted while the engine is running,
an abnormal value may be
indicated.
MAS A/F SE-B1 V The signal voltage of the mass air flow sensor is
displayed. When the engine is stopped,
a certain value is indicated.
When engine is running,
specification range is indicat-
ed in “SPEC”.
B/FUEL SCHDL ms “Base fuel schedule” indicates the fuel injection
pulse width programmed into ECM, prior to any
learned on board correction. When engine is running,
specification range is indicat-
ed in “SPEC”.
Revision: 2010 May2011 QX56

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INFINITI QX56 2011 Factory Service Manual
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

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
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INFINITI QX56 2011 Factory Service Manual
DIAGNOSIS SYSTEM (ECM)EC-67
< SYSTEM DESCRIPTION > [VK56VD]
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OLOAD SIGNAL ON/OFF
Indicates [ON/OFF] condition from the electrical
load signal.
ON: Rear window defogger

DIAGNOSIS SYSTEM (ECM)EC-67
< SYSTEM DESCRIPTION > [VK56VD]
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OLOAD SIGNAL ON/OFF
Indicates [ON/OFF] condition from the electrical
load signal.
ON: Rear window defogger switch is ON and/or
lighting switch is in 2nd position.
OFF: Both rear window defogger switch and light-
ing switch are OFF.
IGNITION SW ON/OFF Indicates [ON/OFF] condition from ignition switch
signal.
HEATER FAN SW ON/OFF Indicates [ON/OFF] condition from the blower fan
ON signal.
BRAKE SW ON/OFF Indicates [ON/OFF] condition from the stop lamp
switch signal.
IGN TIMING BTDC Indicates the ignition timing computed by ECM ac-
cording to the input signals. When the engine is stopped,
a certain value is indicated.
COMBUSTION — These items are displayed but are not applicable to
this model.
CAL/LD VALUE % “Calculated load value” indicates the value of the
current air flow divided by peak air flow.
MASS AIRFLOW g/s Indicates the mass air flow computed by ECM ac-
cording to the signal voltage of the mass air flow
sensor.
PURG VOL C/V % Indicates the EVAP canister purge volume control
solenoid valve control value computed by the ECM
according to the input signals.
The opening becomes larger as the value increas-
es.
INT/V SOL (B1)
% The control value of the intake valve timing control
solenoid valve (determined by ECM according to
the input signals) is indicated.
The advance angle becomes larger as the value increases.
INT/V SOL (B2)
AIR COND RLY ON/OFF
The air conditioner relay control condition (deter-
mined by ECM according to the input signals) is in-
dicated.
VENT CONT/V ON/OFF The control condition of the EVAP canister vent
control valve (determined by ECM according to the
input signals) is indicated.
ON: Closed
OFF: Open
THRTL RELAY ON/OFF Indicates the throttle co
ntrol motor relay control
condition determined by the ECM according to the
input signals.
A/F S1 HTR (B1)
% Air fuel ratio (A/F) sensor 1 heater control value
computed by ECM according to the input signals.
The current flow to the heater becomes larger as the value increases.
A/F S1 HTR (B2)
HO2S2 HTR (B1)
ON/OFF Indicates [ON/OFF] condition of heated oxygen
sensor 2 heater determined by ECM according to
the input signals.
HO2S2 HTR (B2)
ALT DUTY SIG ON/OFF The control condition of the power generation volt-
age variable control (determined by ECM accord-
ing to the input signals) is indicated.
ON: Power generation voltage variable control is
active.
OFF: Power generation voltage variable control is
inactive.
I/P PULLY SPD rpm Indicates the engine speed computed from the in-
put speed sensor signal.
Monitored item Unit Description Remarks
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INFINITI QX56 2011 Factory Service Manual
EC-68
< SYSTEM DESCRIPTION >[VK56VD]
DIAGNOSIS SYSTEM (ECM)
VEHICLE SPEED km/h or mph The vehicle speed computed from the vehicle
speed signal sent from TCM is displayed.
IDL A/V LEARN YET/CMPLT

EC-68
< SYSTEM DESCRIPTION >[VK56VD]
DIAGNOSIS SYSTEM (ECM)
VEHICLE SPEED km/h or mph The vehicle speed computed from the vehicle
speed signal sent from TCM is displayed.
IDL A/V LEARN YET/CMPLT Displays the condition of Idle Air Volume Learning
YET: Idle air volume learning has not been per-
formed yet.
CMPLT: Idle air volume learning has already been
performed successfully.
TRVL AFTER MIL km or mile Distance traveled while MIL is activated.
SNOW MODE SW ON/OFF Indicates [ON/OFF] condition from the snow mode
switch signal.
ENG OIL TEMP °C or °F The engine oil temperature (determined by the sig-
nal voltage of the engine oil temperature sensor) is
displayed.
MAIN SW ON/OFF Indicates [ON/OFF] condition from MAIN switch
signal.
CANCEL SW ON/OFF Indicates [ON/OFF] condition from CANCEL
switch signal.
RESUME/ACC SW ON/OFF Indicates [ON/OFF] condition from RESUME/AC-
CELERATE switch signal.
SET SW ON/OFF Indicates [ON/OFF] condition from SET/COAST
switch signal.
BRAKE SW1 ON/OFF Indicates [ON/OFF] condition from ASCD brake
switch signal.
BRAKE SW2 ON/OFF Indicates [ON/OFF] condition of stop lamp switch
signal.
DIST SW ON/OFF Indicates [ON/OFF] condition from DISTANCE
switch signal.
CRUISE LAMP ON/OFF Indicates [ON/OFF] condition of CRUISE indicator
determined by the ECM according to the input sig-
nals.
AC EVA TEMP °C or °F Indicates A/C evaporator temperature sent from A/
C auto amp.
AC EVA TARGET °C or °F Indicates target A/C evaporator temperature sent
from A/C auto amp.
FAN DUTY % Indicates a command value for cooling fan. The
value is calculated by ECM based on input signals.
ALT DUTY % Indicates the duty ratio of the power generation
command value. The ratio is calculated by ECM
based on the battery current sensor signal.
BAT CUR SEN mV The signal voltage of battery current sensor is dis-
played.
A/F ADJ-B1
— Indicates the correction of a factor stored in ECM.
The factor is calculated from the difference be-
tween the target air-fuel ratio stored in ECM and
the air-fuel ratio calculated from A/F sensor 1 sig-
nal.
A/F ADJ-B2
P/N POSI SW ON/OFF
Indicates [ON/OFF] condition from the park/neutral
position (PNP) signal.
INT/A TEMP SE °C or °F The intake air temperature (determined by the sig-
nal voltage of the intake air temperature sensor) is
indicated.
AC PRESS SEN V The signal voltage from the refrigerant pressure
sensor is displayed.
FUEL PRES SEN MPa Indicates the fuel rail pressure computed by ECM
according to the input signals
Monitored item Unit Description Remarks
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INFINITI QX56 2011 Factory Service Manual
DIAGNOSIS SYSTEM (ECM)EC-69
< SYSTEM DESCRIPTION > [VK56VD]
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FUEL INJ B1 msec
ECM-calculated injection pulse width of the fuel in-
jector on the Bank 1 side.
FUEL INJ

DIAGNOSIS SYSTEM (ECM)EC-69
< SYSTEM DESCRIPTION > [VK56VD]
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FUEL INJ B1 msec
ECM-calculated injection pulse width of the fuel in-
jector on the Bank 1 side.
FUEL INJ B2 msec ECM-calculated injection pulse width of the fuel in-
jector on the Bank 2 side.
INT/V TIM (B1) °CA Indicates [ °CA] of intake camshaft advance angle.
INT/V TIM (B2)
MAP SENSOR V The signal voltage from the manifold absolute
pressure (MAP) sensor is displayed.
EVAP LEAK DIAG YET/CMPLT Indicates the condition of EVAP leak diagnosis.
YET: EVAP leak diagnosis has not been performed
yet.
CMPLT: EVAP leak diagnosis has been performed
successfully.
EVAP DIAG READY ON/OFF Indicates the ready condition of EVAP leak diagno-
sis.
ON: Diagnosis has been ready condition.
OFF: Diagnosis has not been ready condition.
VVEL LEARN YET/DONE Display the conditi
on of VVEL learning
YET: VVEL learning has not been performed yet.
DONE: VVEL learning has already been per-
formed successfully.
VVEL SEN LEARN-B1 V Indicates the VVEL learning value.
VVEL SEN LEARN-B2
VVEL POSITION SEN-B1 V The VVEL control shaft position sensor signal volt-
age is displayed.
VVEL POSITION SEN-B2
VVEL TIM-B1
deg Indicates [deg] of VVEL control shaft angle.
VVEL TIM-B2
FPCM HI/MID/LOW/
OFF The control condition of the fuel pump control mod-
ule (FPCM) (determined by ECM according to the
input signals) is indicated.
BAT TEMP SEN V The signal voltage from the battery temperature
sensor is displayed.
COOLING FAN SPD rpm Displays a cooling fan speed from a signal of elec-
trically-controlled cooling fan coupling.
THRTL STK CNT B1* — —
HO2 S2 DIAG2(B1)* INCMP/CM-
PLT Indicates DTC P0139 self-diagnosis (slow re-
sponse) condition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.
HO2 S2 DIAG2(B2)* INCMP/CM-
PLT Indicates DTC P0159 self-diagnosis (slow re-
sponse) condition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.
FUEL INJ TIMG deg Indicates the fuel injection timing computed by
ECM according to the input signals.
H/P FUEL PUMP DEG deg Displays ECM-calculated fuel discharge position
of the high pressure fuel pump.
FUEL PRES SEN V mV The signal voltage of FRP sensor is displayed.
L/FUEL PRES SEN MPa Displays a pressure value calculated from a low
fuel pressure sensor voltage.
L/FUEL PRES SEN V mV The signal voltage of low fuel pressure sensor is
displayed.
Monitored item Unit Description Remarks
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INFINITI QX56 2011 Factory Service Manual
EC-70
< SYSTEM DESCRIPTION >[VK56VD]
DIAGNOSIS SYSTEM (ECM)
*: The item is indicated, but not used.
NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the displa

EC-70
< SYSTEM DESCRIPTION >[VK56VD]
DIAGNOSIS SYSTEM (ECM)
*: The item is indicated, but not used.
NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
ACTIVE TEST MODE
Test Item
ECM TEMP 1
°C or °F Displays a temperature calculated from a signal of
ECM temperature sensor 1.
ECM TEMP 2 °C or °F Displays a temperature calculated from a signal of
ECM temperature sensor 2.
FUEL PUMP DUTY % The control condition of the fuel pump control mod-
ule (FPCM) (determined by ECM according to the
input signals) is indicated.
Monitored item Unit Description Remarks
TEST ITEM CONDITION JUDGMENT CHECK ITEM (REMEDY)
VENT CON-
TROL/V Ignition switch: ON (Engine
stopped)
Turn solenoid valve ON and OFF with the CONSULT-III and listen
to operating sound. Solenoid valve makes an operating
sound.
Harness and connectors
Solenoid valve
ENG COOLANT
TEMP Engine: Return to the original
non-standard condition
Change the engine coolant tem- perature using CONSULT-III. If malfunctioning symptom disap-
pears, see CHECK ITEM. Harness and connectors
Engine coolant temperature sen-
sor
Fuel injector
FUEL INJEC-
TION Engine: Return to the original
non-standard condition
Change the amount of fuel injec- tion using CONSULT-III. If malfunctioning symptom disap-
pears, see CHECK ITEM.
Harness and connectors
Fuel injector
Air fuel ratio (A/F) sensor 1
FUEL/T TEMP
SEN Change the fuel tank temperature using CONSULT-III.
PURG VOL
CONT/V Engine: After warming up, run en-
gine at 1,500 rpm.
Change the EVAP canister purge
volume control solenoid valve
opening percent using CON-
SULT-III. Engine speed changes according to
the opening percent.
Harness and connectors
Solenoid valve
FAN DUTY CON-
TROL* Ignition switch: ON
Change duty ratio using CON-
SULT-III. Cooling fan speed changes. Harness and connectors
Cooling fan motor
Cooling fan relay
Cooling fan control module
IPDM E/R
ALTERNATOR
DUTY Engine: Idle
Change duty ratio using CON-
SULT-III. Battery voltage changes. Harness and connectors
IPDM E/R
Alternator
POWER BAL-
ANCE Engine: After warming up, idle the
engine.
A/C switch OFF
Selector lever: P or N
Cut off each injector signal one at a time using CONSULT-III. Engine runs rough or stops.
Harness and connectors
Compression
Fuel injector
Power transistor
Spark plug
Ignition coil
IGNITION TIM-
ING Engine: Return to the original
non-standard condition
Timing light: Set
Retard the ignition timing using
CONSULT-III. If malfunctioning symptom disap-
pears, see CHECK ITEM.
Perform Idle Air Volume Learning.
Revision: 2010 May2011 QX56

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INFINITI QX56 2011 Factory Service Manual
DIAGNOSIS SYSTEM (ECM)EC-71
< SYSTEM DESCRIPTION > [VK56VD]
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*: Leaving cooling fan OFF with CONSULT-III while engine is running may cause the engine to overheat.
DTC &

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INFINITI QX56 2011 Factory Service Manual
EC-72
< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
ECU DIAGNOSIS INFORMATION
ECM
Reference ValueINFOID:0000000006217730
VALUES ON THE DIAGNOSIS TOOL
NOTE:
Specification data are reference values.
Sp

EC-72
< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
ECU DIAGNOSIS INFORMATION
ECM
Reference ValueINFOID:0000000006217730
VALUES ON THE DIAGNOSIS TOOL
NOTE:
Specification data are reference values.
Specification data are output/input values which are
detected or supplied by the ECM at the connector.
* Specification data may not be directly relat ed to their components signals/values/operations.
i.e. Adjust ignition timing with a timing light before monitoring IGN TIMING, because the monitor may show
the specification data in spite of the ignition timing not being adjusted to the specification data. This IGN TIM-
ING monitors the data calculated by the ECM accordi ng to the signals input from the camshaft position sen-
sor and other ignition timing related sensors.
CONSULT-III MONITOR ITEM
Monitor Item Condition Values/Status
ENG SPEED Run engine and compare CONSULT-III value with the tachometer indication. Almost the same speed as
the tachometer indication
MAS A/F SE-B1 See EC-161, "
Description".
B/FUEL SCHDL See EC-161, "
Description".
A/F ALPHA-B1 See EC-161, "
Description".
A/F ALPHA-B2 See EC-161, "
Description".
COOLAN TEMP/S Ignition switch: ON Indicates engine coolant
temperature
A/F SEN1 (B1) Engine: After warming up Maintaining engine speed at 2,000 rpm Fluctuates around 1.5 V
A/F SEN1 (B2) Engine: After warming up Maintaining engine speed at 2,000 rpm Fluctuates around 1.5 V
HO2S2 (B1) Revving engine from idle up to 3,000 rpm quickly after the following condi-
tions are met.
- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load 0 - 0.3 V
⇔ Approx. 0.6 - 1.0
V
HO2S2 (B2) Revving engine from idle up to 3,000 rpm quickly after the following condi-
tions are met.
- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load 0 - 0.3 V
⇔ Approx. 0.6 - 1.0
V
HO2S2 MNTR (B1) Revving engine from idle up to 3,000 rpm quickly after the following condi-
tions are met.
- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and
at idle for 1 minute under no load LEAN
⇔ RICH
HO2S2 MNTR (B2) Revving engine from idle up to 3,000 rpm quickly after the following condi-
tions are met.
- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load LEAN
⇔ RICH
VHCL SPEED SE Turn drive wheels and compare CONSULT-III value with the speedometer in-
dication. Almost the same speed as
speedometer indication
BATTERY VOLT Ignition switch: ON (Engine stopped) 11 - 14 V
ACCEL SEN 1 Ignition switch: ON
(Engine stopped) Accelerator pedal: Fully released 0.65 - 0.87 V
Accelerator pedal: Fully depressed 4.3 - 4.8 V
ACCEL SEN 2*
1 Ignition switch: ON (Engine stopped) Accelerator pedal: Fully released 0.56 - 0.96 V
Accelerator pedal: Fully depressed 4.0 - 4.8 V
Revision: 2010 May2011 QX56

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