engine INFINITI QX56 2011 Factory Service Manual

MWI-12
< SYSTEM DESCRIPTION >
SYSTEM
METER SYSTEM : Fail-Safe
INFOID:0000000006221695
FA I L - S A F E
The combination meter activates the fail-safe contro l if CAN communication with each unit is malfunctioning.
A. With ASCD models B. With ICC models C. For U.S.A.
D. For Canada
JSNIA3234ZZ
Function Specifications
Speedometer
Reset to zero by suspending communication.
Tachometer
Engine coolant temperature gauge
Engine oil pressure gauge
Illumination control When suspending communication, changes to nighttime mode.
Information display Odo/trip meter An indicated value is maintained at communications blackout.
Shift position indicator The display turns OFF by suspending communication.
Door open warning The display turns OFF by suspending communication.
Buzzer The buzzer turns OFF by suspending communication.
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
SYSTEMMWI-17
< SYSTEM DESCRIPTION >
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- During a crank with vehicle speed less than 1 km/h (0.6 MPH)
- Ignition switch OFF or ACC
 The combination meter receives the following signals to control meter illumination.
METER ILLUMINATION CONTROL FUNCTION
 The combination meter controls meter illumination, based on the following signal.
- Dimmer signal
 The combination meter switches mode between Daytim e mode and Nighttime mode, according to the fol-
lowing conditions.
*: For further information, refer to INL-11, "
AUTO LIGHT ADJUSTMENT SYSTEM : System Description".
 The operation of the illumination control switch allo ws the brightness adjustment of meter illumination.
METER EFFECT FUNCTION
METER EFFECT FUNCTION : System DiagramINFOID:0000000006221714
METER EFFECT FUNCTION : System DescriptionINFOID:0000000006221715
ENGINE-START EFFECT FUNCTION
Signal name Signal path
Ignition signal —
Engine status signal ECM Combination meter
Vehicle speed signal ABS actuator and control unit (control unit) Combination meter
Starter relay status signal BCM Combination meter
Condition Meter illumination
Combination switch
(lighting switch) 1ST or 2ND position
Outdoor: Bright* Daytime mode
Outdoor: Dark* Nighttime mode
AUTO POSITION Outdoor: Bright* Daytime mode
Outdoor: Dark* Nighttime mode
Off Daytime mode
Meter illumination The number of adjustable steps
Daytime 22 steps
Nighttime 22 steps
JSNIA3058GB
Revision: 2010 May2011 QX56

MWI-18
< SYSTEM DESCRIPTION >
SYSTEM
When recognizing an engine start, the combination meter controls the following items for producing the effect.
 Speedometer
 Tachometer
 Engine coolant temperature gauge
 Fuel gauge
 Engine oil pressure gauge
 Voltmeter
 Meter illumination
Meter and Illumination Operations During Engine-start Effect
The combination meter controls the following items during the engine-start effect.
NOTE:
The pointers are stopped and illumination is turned off while cranking the engine.
Engine Start Judgement
The combination meter judges “engine-start” and activates the engine-start effect only once when the follow-
ing operational conditions are all satisfied.
NOTE:
Engine-start effect exits when any of the above operat ional conditions is cancelled during the engine-start
effect.
Signal path
The combination meter judges “engine-start,” according to the following signals and activates the engine-start
effect function.
DRIVER WELCOME FUNCTION
Control item Operation
Speedometer Sweeps the pointer.
Tachometer Sweeps the pointer.
Engine coolant temperature gauge Stops the pointer.
Fuel gauge Stops the pointer.
Engine oil pressure gauge Stops the pointer.
Voltmeter Stops the pointer.
Meter illumination Pointers Turns on the illumination at the effect level.
Information display Turns on the illumination at the normal brightness level.
Other than those above Increases the brightness to the effect level in stages.
Condition
Ignition switch ON position
Vehicle speed Less than 1 km/h (0.6 MPH)
Engine state Other than the time of cranking the engine
500 rpm or more
Information display
(SETTING) The setting of “EFFECT” is “ON.”
Signal name Signal path
Ignition signal —
Starter relay status signal BCM Combination meter
Engine speed signal ECM Combination meter
Engine status signal
Vehicle speed signal ABS actuator and electric unit (control unit) Combination meter
Revision: 2010 May2011 QX56

MWI
SYSTEMMWI-23
< SYSTEM DESCRIPTION >
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 The ambient sensor input value that is displayed on “Data Monitor” of CONSULT-III is the value before the
correction. It may not match the indica ted temperature on the information display.
 After removal and installation of the battery and comb ination meter, an ambient sensor-detected tempera-
ture is indicated on the information display.
 Depending on engine heat or heat on the road surfaces, an ambient temperature may be indicated higher
than actual one.
INTERRUPT INDICATION
 The combination meter displays an interrupt regarding a warning, alert, and maintenance on the information
display, based on signals received from each unit and switch.
 When conditions are satisfied, the normal screen swit ches to a warning screen to display an interrupt.
Door Open Warning
 When all the following operating conditions are satisfied, the combination meter displays a door open warn-
ing on the information display by an interrupt.
 The combination meter judges showing/hiding of “door open warning”, according to the signals below:
Parking Brake Release Warning
 When all the following operating conditions are satisfi ed, the combination meter displays a parking brake
release warning on the information display by an interrupt.
 The combination meter judges showing/hiding of “parki ng brake release warning”, according to the signals
below:
Low Fuel Warning
 When all the following operating conditions are satisfied, the combination meter displays a low fuel warning on the information display by an interrupt.
*: With the vehicle in a horizontal position
 The combination meter judges showing/hiding of “low fuel warning”, according to the signals below:
Operating condition
Ignition switch ON
Door Any door is open
Signal name Signal path
Ignition signal —
Door switch signal Door switch BCM Combination meter
Operating condition
Ignition switch ON
Parking brake Applied
Vehicle speed 7 km/h (4.3 MPH) or more
Signal name Signal path
Ignition signal —
Parking brake switch signal Parking brake switch Combination meter
Vehicle speed signal ABS actuator and electric unit (control unit) Combination meter
Operating condition
Ignition switch ON
Fuel remaining quantity
*Approximately 15.4 (4 US gal, 3-3/8 Imp gal) or less (including fuel remained)
Revision: 2010 May2011 QX56

MWI
SYSTEMMWI-25
< SYSTEM DESCRIPTION >
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Tire (Maintenance) When all the following operating conditions are satisfied, the combination meter displays a tire warning on
the information display by an interrupt.
 The combination meter judges showing/hiding of “tire warning”, according to the signals below:
Oil Filter (Maintenance)
 When all the following operating conditions are satisfied, the combination meter displays an oil filter warning on the information display by an interrupt.
 The combination meter judges showing/hiding of “oil filter warning”, according to the signals below:
Engine Oil (Maintenance)
 When all the following operating conditions are satisfied, the combination meter displays an engine oil warn-
ing on the information display by an interrupt.
 The combination meter judges showing/hiding of “engine oil warning”, according to the signals below:
Other (Maintenance)
 When all the following operating conditions are satisfied, the combination meter displays an other warning on the information display by an interrupt.
Signal name Signal path
Ignition signal —
Ambient sensor signal Ambient sensor Combination meter
Operating condition
Ignition switch ON
Mileage More than value set in “SETTING”
Signal name Signal path
Ignition signal —
Vehicle speed signal ABS actuator and electric unit (control unit) Combination meter
Operating condition
Ignition switch ON
Mileage More than value set in “SETTING”
Signal name Signal path
Ignition signal —
Vehicle speed signal ABS actuator and electric unit (control unit) Combination meter
Operating condition
Ignition switch ON
Mileage More than value set in “SETTING”
Signal name Signal path
Ignition signal —
Vehicle speed signal ABS actuator and electric unit (control unit) Combination meter
Revision: 2010 May2011 QX56

MWI-26
< SYSTEM DESCRIPTION >
SYSTEM
 The combination meter judges showing/hiding of “other warning”, according to the signals below:
Meter Illumination Level Indication
When receiving the following signals, the combination meter causes an interrupt on the information display to
indicate an illumination level.
WARNING CHECK INDICATION
 The combination meter can cause an interrupt on the information display to indicate a warning, based onsignals received from each unit and switch.
 The indicated warning can be checked with “WARNING” during the satisfaction of an interrupt indication
condition for each warning.
SETTING
Warning indication timing and time can be set.
Alert
Setting values for travel time, and low ambient te mperature can be adjusted to meet the user's needs.
Maintenance
Setting values for engine oil, oil filter, tire, and other maintenance items can be adjusted to meet the user's
needs.
Options
Setting values for unit and effect items can be adjusted to meet the user's needs.
Operating condition
Ignition switch ON
Mileage More than value set in “SETTING”
Signal name Signal path
Ignition signal —
Vehicle speed signal ABS actuator and electric unit (control unit) Combination meter
Signal name Signal path
Ignition signal —
Illumination control switch signal (+) Trip reset and illumination control switch Combination meter
Illumination control switch signal ( −)
Setting item Setting range Setting unit
Alert Timer No setting, 0.5 h - 6 h 0.5 h
ICY ON/OFF —
Setting item Setting range
Maintenance Tire
No setting, 500 km - 30,000 km
(No setting, 250 mile - 18,500 mile)
Filter No setting, 500 km - 30,000 km
(No setting, 250 mile - 18,500 mile)
Oil No setting, 500 km - 30,000 km
(No setting, 250 mile - 18,500 mile)
Other No setting, 500 km - 30,000 km
(No setting, 250 mile - 18,500 mile)
Revision: 2010 May2011 QX56

MWI
DIAGNOSIS SYSTEM (COMBINATION METER)
MWI-29
< SYSTEM DESCRIPTION >
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DIAGNOSIS SYSTEM (COMBINATION METER)
On Board Diagnosis FunctionINFOID:0000000006221719
ON BOARD DIAGNOSIS ITEM
The combination meter allows the following diagnosis items with the on-board diagnosis function.
METHOD OF STARTING
1. Turn ignition switch OFF.
2. While pressing the trip reset switch (1), turn ignition switch ON.
3. If the diagnosis function is activated with “trip A” displayed, the
mileage on “trip A” is reset to “0000.0”. (The same way for “trip
B”.)
4. Make sure that the trip meter displays “0000.0”.
5. Press the trip reset switch at least 3 times. (Wit hin 7 seconds after the ignition switch is turned ON.)
6. The combination meter is turned to self-diagnosis mode.  Speedometer, tachometer, engine coolant temper ature gauge, fuel gauge, engine oil pressure gauge,
and voltmeter return to zero, simultaneously.
 The dot matrix dots on the information display (1) blink alter-
nately.
NOTE:
 Check combination meter power supply and ground circuit when the self-diagnosis mode of the combi- nation meter does not start. Replace combination meter if power supply and ground circuit are normal.
 If any of the dots are not displayed, replace combination meter.
Diagnosis item
Drive circuit check  Speedometer
 Tachometer
 Engine coolant temperature gauge
 Fuel gauge
 Engine oil pressure gauge
 Voltmeter
LCD (liquid crystal display) check Information display
JSNIA2978ZZ
JSNIA0020GB
Revision: 2010 May2011 QX56

MWI-30
< SYSTEM DESCRIPTION >
DIAGNOSIS SYSTEM (COMBINATION METER)
7. Each meter activates by pressing the trip reset switch.NOTE:
 If any of the meters or gauges is not activated, replace combination meter.
 The figure is reference.
CONSULT-III FunctionINFOID:0000000006221720
CONSULT-III APPLICATION ITEMS
CONSULT-III can perform the following diagnosis modes via CAN communication and the combination meter.
SELF DIAG RESULT
Refer to MWI-43, "DTC Index".
DATA MONITOR
Display Item List
X: Applicable
JSNIA3236ZZ
System Diagnosis mode Description
METER/M&A Self Diagnostic Result The combination meter checks the conditions and displays memorized errors.
Data Monitor Displays the combination meter input/output data in real time.
Special function Lighting history of the warning lamp and indicator lamp can be checked.
Display item [Unit]
MAIN
SIGNALS Description
SPEED METER
[km/h] XValue of vehicle speed
signal received from ABS actuator and el ectric unit (control
unit) via CAN communication.
NOTE:
655.35 is displayed when the malfunction signal is received.
SPEED OUTPUT
[km/h] XVehicle speed signal value transmitted to other units via CAN communication.
NOTE:
655.35 is displayed when the malfunction signal is received.
ODO OUTPUT
[km/h or mph] Odometer signal value transmitted to other units via CAN communication.
TACHO METER
[rpm] XValue of the engine speed signal received from ECM via CAN communication.
NOTE:
8191.875 is displayed when the malfunction signal is received.
FUEL METER
[L] X Fuel level indicated on combination meter.
Revision: 2010 May2011 QX56