2011 INFINITI QX56 Fuel

MWI-2
DIAGNOSIS SYSTEM (COMBINATION
METER) ..............................................................
29
On Board Diagnosis Function .............................. ...29
CONSULT-III Function ...........................................30
ECU DIAGNOSIS INFORMATION ..............35
COMBINATION METER ................................. ...35
Reference Value .................................................. ...35
Fail-Safe .................................................................42
DTC Index ..............................................................43
IPDM E/R ...........................................................44
List of ECU Reference ......................................... ...44
WIRING DIAGRAM .....................................45
METER SYSTEM ............................................ ...45
Wiring Diagram .................................................... ...45
CLOCK ...............................................................55
Wiring Diagram .................................................... ...55
BASIC INSPECTION ...................................57
DIAGNOSIS AND REPAIR WORKFLOW
(METER SYSTEM ) .......................................... ...
57
Work flow ............................................................. ...57
DTC/CIRCUIT DIAGNOSIS ...................... ...59
U1000 CAN COMM CIRCUIT ......................... ...59
Description ........................................................... ...59
DTC Logic ...............................................................59
Diagnosis Procedure .............................................59
U1010 CONTROL UNIT (CAN) .........................60
Description ........................................................... ...60
DTC Logic ...............................................................60
Diagnosis Procedure ..............................................60
B2205 VEHICLE SPEED ...................................61
Description ........................................................... ...61
DTC Logic ...............................................................61
Diagnosis Procedure .............................................61
B2267 ENGINE SPEED .....................................62
Description ........................................................... ...62
DTC Logic ...............................................................62
Diagnosis Procedure ..............................................62
B2268 WATER TEMP ........................................63
Description ........................................................... ...63
DTC Logic ...............................................................63
Diagnosis Procedure ..............................................63
POWER SUPPLY AND GROUND CIRCUIT .....64
COMBINATION METER ........................................ ...64
COMBINATION METER : Diagnosis Procedure ....64
TRIP RESET AND ILLUMINATION CON-
TROL SWITCH SIGNAL CIRCUIT ....................
65
Diagnosis Procedure ............................................ ...65
Component Inspection ............................................66
TRIP COMPUTER SWITCH SIGNAL CIRCUIT
...
67
Diagnosis Procedure ............................................ ...67
Component Inspection ............................................68
FUEL LEVEL SENSOR SIGNAL CIRCUIT .......69
Component Function Check ................................ ...69
Diagnosis Procedure ..............................................69
Component Inspection ............................................70
OIL PRESSURE SWITCH SIGNAL CIRCUIT ...71
Component Function Check ...................................71
Diagnosis Procedure ...............................................71
Component Inspection ............................................71
WASHER LEVEL SWITCH SIGNAL CIRCUIT ...73
Diagnosis Procedure ............................................ ...73
Component Inspection ............................................73
A/C AUTO AMP. CONNECTION RECOGNI-
TION SIGNAL CIRCUIT ....................................
74
Diagnosis Procedure ........................................... ...74
SYMPTOM DIAGNOSIS ............................75
THE FUEL GAUGE INDICATOR DOES NOT
OPERATE ....................................................... ...
75
Description ........................................................... ...75
Diagnosis Procedure ...............................................75
THE TRIP RESET AND ILLUMINATION CON-
TROL SWITCH IS INOPERATIVE ....................
76
Description ........................................................... ...76
Diagnosis Procedure ...............................................76
THE TRIP COMPUTER SWITCH IS INOPER-
ATIVE .................................................................
77
Description ........................................................... ...77
Diagnosis Procedure ...............................................77
THE OIL PRESSURE WARNING LAMP
DOES NOT TURN ON .................................... ...
78
Description ........................................................... ...78
Diagnosis Procedure ...............................................78
THE OIL PRESSURE WARNING LAMP
DOES NOT TURN OFF .................................. ...
79
Description ........................................................... ...79
Diagnosis Procedure ...............................................79
THE PARKING BRAKE RELEASE WARNING
CONTINUES DISPLAYING, OR DOES NOT
DISPLAY ............................................................
80
Description ........................................................... ...80
Diagnosis Procedure ...............................................80
Revision: 2010 May2011 QX56

MWI-6
< SYSTEM DESCRIPTION >
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
METER SYSTEM
METER SYSTEM : Component Parts LocationINFOID:0000000006221690
1.IPDM E/R
Refer to
PCS-4, "Component Parts
Location". 2.
ECM
Refer to
EC-16, "
Component Parts
Location". 3. Washer level switch
4. Oil pressure switch
Refer to
EM-57, "
Exploded View".5. Ambient sensor 6. A/C auto amp.
Refer to
HAC-6, "
FRONT AUTO-
MATIC AIR CONDITIONING SYS-
TEM : Component Parts Location".
7. TCM
Refer to
TM-10, "
A/T CONTROL
SYSTEM : Componen t Parts Loca-
tion". 8.ABS actuator and electric unit (con-
trol unit)
Refer to
BRC-10, "
Component Parts
Location". 9.BCM
Refer to
BCS-4, "
BODY CONTROL
SYSTEM : Component Parts Loca-
tion".
10. Fuel level sensor unit 11. Trip computer switch 12. Combination meter
13. Trip reset and illumination control
switch 14. Parking brake switch
A. Under of left side second seat
JSNIA3157ZZ
Revision: 2010 May2011 QX56

MWI
COMPONENT PARTSMWI-7
< SYSTEM DESCRIPTION >
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METER SYSTEM : Com ponent DescriptionINFOID:0000000006221691
CLOCK
Unit Description
Combination meter Controls the following with the signals received from each unit via CAN communication and the sig-
nals from switches and sensors.
 Speedometer
 Tachometer
 Engine coolant temperature gauge
 Fuel gauge
 Engine oil pressure gauge
 Voltmeter
 Warning lamps
 Indicator lamps
 Meter illumination control
 Meter effect function
 Information display
Trip computer switch Transmits the following signals to the combination meter.
 Enter switch signal
 Select switch signal
Trip reset and illumination con-
trol switch Transmits the following signals to the combination meter.
 Trip reset switch signal
 Illumination control switch signal (+)
 Illumination control switch signal (
−)
ECM Transmits the following signals to the combination meter via CAN communication.
 Engine speed signal
 Engine coolant temperature signal
 Engine status signal
 Fuel consumption monitor signal
ABS actuator and electric unit
(control unit) Transmits the vehicle speed signal to the combination meter via CAN communication.
IPDM E/R Transmits the oil pressure switch signal to the BCM via CAN communication.
BCM Transmits the following signals to the combination meter via CAN communication.
 Oil pressure switch signal
 Position light request signal
 Dimmer signal
 Door switch signal
 Meter ring illumination request signal
 Starter relay status signal
TCM Transmits the shift position signal to the combination meter via CAN communication.
A/T shift selector Transmits the following signals to the combination meter.
 Manual mode signal
 Non-manual mode signal
 Manual mode shift up signal
 Manual mode shift down signal
Fuel level sensor unit Transmits the fuel level sensor signal to the combination meter.
Oil pressure switch Transmits the oil pressure switch signal to the IPDM E/R.
Ambient sensor Transmits the ambient sensor signal to the combination meter.
A/C auto amp. Transmits the A/C auto amp. connection recognition signal to the combination meter.
Parking brake switch Transmits the parking brake switch signal to the combination meter.
Washer level switch Transmits the washer level switch signal to the combination meter.
Revision: 2010 May2011 QX56

MWI-10
< SYSTEM DESCRIPTION >
SYSTEM
System Description Reference
Measuring in-
struments Speedometer Indicates vehicle speed.
MWI-13,
"SPEEDOME-
TER : System De-
scription"
Tachometer Indicates engine speed.MWI-14, "
TA -
CHOMETER :
System Descrip-
tion"
Engine coolant temperature gauge Indicates engine coolant temperature.MWI-14, "
EN-
GINE COOLANT
TEMPERATURE
GAUGE : System
Description"
Fuel gauge Indicates fuel level.
MWI-14, "
FUEL
GAUGE : System
Description"
Engine oil pressure gauge Indicates engine oil pressure.MWI-15, "
EN-
GINE OIL PRES-
SURE GAUGE :
System Descrip-
tion"
Voltmeter Indicates voltage of ignition signal.
MWI-15, "
VOLT-
METER : System
Description"
Warning lamp/
indicator lampOil pressure warning lamp
The warning lamp turns ON or turns OFF,
according to engine hydraulic pressure.MWI-16, "
OIL
PRESSURE
WARNING LAMP
: System Descrip-
tion"
Master warning lamp
Turns ON/OFF in synchronization with a
warning indicated on the information display.MWI-16, "
MAS-
TER WARNING
LAMP : System
Description"
Meter illumi-
nation controlMeter illumination on/off control function
The meter illumination turns ON/OFF, ac-
cording to the status of ignition switch and a
cranking condition.
MWI-16, "
METER
ILLUMINATION
CONTROL : Sys-
tem Description"Meter illumination control function Switch mode between daytime mode and
night time mode, according to a light switch
position or ambient brightness.
Meter effect
function Engine-start effect function
Controls pointers of combination meter and
meter illumination at engine start to produce
illumination effects.MWI-17, "
METER
EFFECT FUNC-
TION : System
Description"Driver welcome function
Controls meter illumination to produce illu-
mination effects when getting in the vehicle.
Revision: 2010 May2011 QX56

MWI
SYSTEMMWI-11
< SYSTEM DESCRIPTION >
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M B A
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ARRANGEMENT OF COMBINATION METER
Information
display Odo/trip meter Displays mileage.
MWI-20, "
INFOR-
MATION DIS-
PLAY : System
Description"
Shift position indicator Displays shift position.
Trip computerCurrent fuel consumption Displays current fuel consumption.
Average fuel consumption Displays average fuel consumption.
Distance to empty Displays distance to empty.
Average vehicle speed Displays average vehicle speed.
Travel time Displays travel time.
Travel distance Displays mileage.
Ambient temperature Displays ambient temperature.
Interrupt indi-
cation Warning
Door open
warning
Warns when a door is open.
Parking brake
release warning Warns if traveling when the parking brake is
under operating condition.
Low fuel warn-
ing Warns when being low on fuel.
Low washer flu-
id warning Displayed/Hidden, depending on washer
fluid level.
Alert Travel time
Causes an interrupt when exceeding ran-
domly set time.
Low ambient
temperature Causes an interrupt when ambient tempera-
ture reaches below 3
°C (37 °F).
Maintenance Tire
Causes an interrupt when exceeding ran-
domly set distance.
Oil filter Causes an interrupt when exceeding ran-
domly set distance.
Engine oil Causes an interrupt when exceeding ran-
domly set distance.
Other Causes an interrupt when exceeding ran-
domly set distance.
Meter illumination level Indicates the brightness of the meter illumi-
nation in stages.
Setting Alert
Timer
Allows the user to set a display time for
“Travel time”.
ICY Allows the ON/OFF setting of the low ambi-
ent temperature (alert) function.
Maintenance Tire
Alerts when reaching mileage set in “SET-
TING”.
Filter Alerts when reaching mileage set in “SET-
TING”.
Oil Alerts when reaching mileage set in “SET-
TING”.
Other Alerts when reaching mileage set in “SET-
TING”.
Options Language
Allows the user to set language for informa-
tion display.
Unit Allows unit settings.
Effects Allows the ON/OFF setting of the engine-
start effect function.
System Description Reference
Revision: 2010 May2011 QX56

MWI-14
< SYSTEM DESCRIPTION >
SYSTEM
TACHOMETER : System Diagram
INFOID:0000000006221698
TACHOMETER : System DescriptionINFOID:0000000006221699
 ECM converts the pulse signal provided by the crankshaft position sensor to an engine speed signal and
transmits it to the combination meter via CAN communication.
 The combination meter indicates the engine speed to the tachometer according to the engine speed signal
received via CAN communication.
ENGINE COOLANT TEMPERATURE GAUGE
ENGINE COOLANT TEMPERATURE GAUGE : System DiagramINFOID:0000000006221700
ENGINE COOLANT TEMPERATURE GAUGE : System DescriptionINFOID:0000000006221701
 ECM reads the engine coolant temperature signal from the engine coolant temperature sensor and transmits
the signal to the combination meter via CAN communication.
 The combination meter indicates the engine coolant temperature to the engine coolant temperature gauge
according to the engine coolant temperature signal received via CAN communication.
FUEL GAUGE
FUEL GAUGE : System DiagramINFOID:0000000006221702
FUEL GAUGE : System DescriptionINFOID:0000000006221703
CONTROL OUTLINE
The combination meter reads the fuel level sensor signal from the fuel level sensor unit and indicates the fuel
level to the fuel gauge.
JSNIA2462GB
JSNIA3015GB
JSNIA3000GB
Revision: 2010 May2011 QX56

MWI
SYSTEMMWI-15
< SYSTEM DESCRIPTION >
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REFUEL CONTROL
The combination meter accelerates the fuel gauge if the all conditions listed below are met, or the ignition
switch is ON from OFF.
 Ignition switch is ON position.
 The vehicle is not moving.
 The fuel level change by 15 (4 US gal, 3-1/4 Imp gal) or more.
ENGINE OIL PRESSURE GAUGE
ENGINE OIL PRESSURE GAUGE : System DiagramINFOID:0000000006221704
ENGINE OIL PRESSURE GAUGE : System DescriptionINFOID:0000000006221705
 IPDM E/R reads the ON/OFF signals from the oil pressure switch and transmits the oil pressure switch sig-
nal to the combination meter via BCM with the CAN communication.
 The combination meter indicates engine oil pressure (Normal/Low) on the engine oil pressure gauge, based
on an oil pressure switch signal received via CAN communication.
VOLTMETER
VOLTMETER : System DiagramINFOID:0000000006221706
VOLTMETER : System DescriptionINFOID:0000000006221707
The combination meter reads the voltage of an ignition signal and indicates the voltage on the voltmeter when
the ignition switch is in ON or START position.
OIL PRESSURE WARNING LAMP
OIL PRESSURE WARNING LAMP : System DiagramINFOID:0000000006221708
JSNIA2998GB
JSNIA2996GB
JSNIA2464GB
Revision: 2010 May2011 QX56

MWI-16
< SYSTEM DESCRIPTION >
SYSTEM
OIL PRESSURE WARNING LAMP : System Description
INFOID:0000000006221709
 IPDM E/R reads the ON/OFF signals fr om the oil pressure switch and transmits the oil pressure switch sig-
nal to the combination meter via BCM with the CAN communication.
 The combination meter turns the oil pressure warning lamp ON (at the time of a reduction in hydraulic pres-
sure)/OFF (except at the time of a reduction in hydraulic pressure) according to the oil pressure switch signal
received via CAN communication.
MASTER WARNING LAMP
MASTER WARNING LAMP : System DiagramINFOID:0000000006221710
MASTER WARNING LAMP : System DescriptionINFOID:0000000006221711
When receiving a signal from each unit, switch, or s ensor, the combination meter turns ON/OFF the master
warning lamp in synchronization with the following warnings on the information display:
 Door open warning
 Parking brake release warning
 Low fuel warning
 Low washer fluid warning
 NO KEY warning
NOTE:
For details on warnings displayed on the vehicle information display, refer to MWI-20, "
INFORMATION DIS-
PLAY : System Description".
METER ILLUMINATION CONTROL
METER ILLUMINATION CONTROL : System DiagramINFOID:0000000006221712
METER ILLUMINATION CONTRO L : System DescriptionINFOID:0000000006221713
METER ILLUMINATION ON/OFF CONTROL FUNCTION
 Combination meter turns ON meter illumination when the following condition is satisfied:
- Ignition switch ON
 Combination meter turns OFF meter illumination when any of the following condition is satisfied:
JSNIA3098GB
JSNIA3235GB
Revision: 2010 May2011 QX56