ECU INFINITI QX56 2011 Factory Service Manual

MWI-36
< ECU DIAGNOSIS INFORMATION >
COMBINATION METER
LIGHT INDIgnition switch
ONTail lamp indicator lamp ON On
Tail lamp indicator lamp OFF Off
OIL W/L Ignition switch
ONOil pressure warning lamp ON On
Oil pressure warning lamp OFF Off
MIL Ignition switch
ONMalfunction indicator lamp ON On
Malfunction indicator lamp OFF Off
GLOW IND Ignition switch
ONNOTE:
This item is displayed, but cannot be moni-
tored.
Off
CRUISE IND Ignition switch
ONCRUISE indicator ON On
CRUISE indicator OFF Off
SET IND Ignition switch
ONSET indicator ON On
SET indicator OFF Off
CRUISE W/L Ignition switch
ONCRUISE warning lamp ON On
CRUISE warning lamp OFF Off
BA W/L Ignition switch
ONIBA OFF indicator lamp ON On
IBA OFF indicator lamp OFF Off
ATC/T-AMT W/L Ignition switch
ONA/T check warning lamp ON On
A/T check warning lamp OFF Off
ATF TEMP W/L Ignition switch
ONNOTE:
This item is displayed, but cannot be moni-
tored.
Off
4WD W/L Ignition switch
ON4WD warning lamp ON On
4WD warning lamp OFF Off
FUEL W/L Ignition switch
ONDuring low fuel warning indication On
Other than the above Off
WASHER W/L Ignition switch
ONDuring low washer flui
d warning indication On
Other than the above Off
AIR PRES W/L Ignition switch
ONLow tire pressure
warning lamp ON On
Low tire pressure warning lamp OFF Off
KEY G/Y W/L Ignition switch
ONKEY warning lamp (Green/Yellow) ON On
KEY warning lamp (Green/Yellow) OFF Off
KEY KNOB W/L Ignition switch
ONNOTE:
This item is displayed, but cannot be moni-
tored.
Off
AFS OFF IND Ignition switch
ONAFS OFF indicator lamp ON On
AFS OFF indicator lamp OFF Off
DDS W/L Ignition switch
ONNOTE:
This item is displayed, but cannot be moni-
tored.
Off
LANE W/L
Ignition switch
ONLane departure warning lamp ON On
Lane departure warning lamp OFF Off
LDP IND Ignition switch
ONLDP ON indicator lamp ON On
LDP ON indicator lamp OFF Off
AT P W / L Ignition switch
ONATP warning lamp ON On
ATP warning lamp OFF Off
Monitor Item Condition Value/Status
Revision: 2010 May2011 QX56

MWI
COMBINATION METERMWI-37
< ECU DIAGNOSIS INFORMATION >
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DCA IND Ignition switch
ONNOTE:
This item is displayed, but cannot be moni-
tored.
Off
CHECK SUS IND Ignition switch
ONCK SUSP indicator lamp ON On
CK SUSP indicator lamp OFF Off
LCD Ignition switch
ON
During engine start in
formation indication B&P I
Ignition switch
ACC During engine start in
formation indication B&P N
Ignition switch
LOCK During key ID warning indication ID NG
Ignition switch
LOCK During steering lock information indication ROTAT
Ignition switch
LOCK During P position warning indication SFT P
Ignition switch
LOCK During Intelligent Key insert information in-
dication
INSRT
Ignition switch
LOCK During Intelligent Key low battery warning
indication
BATT
Ignition switch
ON During take away warning indication NO KY
Ignition switch
LOCK During key warning indication OUTKY
Ignition switch
ON During ACC warning indication LK WN
ACC TARGET Ignition switch
ONDuring vehicle ahead detection indicator in-
dication
On
Other than the above Off
ACC DISTANCE Ignition switch
ONWhen following distance set to “LONG” LONG
When following distance set to “MIDDLE” MID
When following distance set to “SHORT” SHORT
Set distance indicator not displayed Off
ACC OWN VHL Ignition switch
ONDuring own vehicle indicator indication On
Other than the above Off
ACC SET SPEED Ignition switch
ONDuring set vehicle speed indicator not dis-
played
Off
During set vehicle speed indicator dis-
played Indicates the set vehicle speed
ACC UNIT Ignition switch
ONSet vehicle speed indicator unit display ON On
Set vehicle speed indicator unit display OFF Off
Monitor Item Condition Value/Status
Revision: 2010 May2011 QX56

MWI-38
< ECU DIAGNOSIS INFORMATION >
COMBINATION METER
SHIFT INDIgnition switch
ONDuring the indication of “P” by shift position
indicator
P
During the indication of “R” by shift position
indicator R
During the indication of “N” by shift position
indicator N
During the indication of “D” by shift position
indicator D
During the indication of “M1” by shift posi-
tion indicator M1
During the indication of “M2” by shift posi-
tion indicator M2
During the indication of “M3” by shift posi-
tion indicator M3
During the indication of “M4” by shift posi-
tion indicator M4
During the indication of “M5” by shift posi-
tion indicator M5
During the indication of “M6” by shift posi-
tion indicator M6
During the indication of “M7” by shift posi-
tion indicator M7
4WD IND Ignition switch
ON4WD shift switch in AUTO position AUTO
4WD shift switch in 4H position LOCK
4WD shift switch in 4L position LOCK/4Lo
BSW IND Ignition switch
ONNOTE:
This item is displayed, but cannot be moni-
tored.
Off
BSW W/L Ignition switch
ONBSW warning lamp ON On
BSW warning lamp OFF Off
AT S MODE SW Ignition switch
ONSnow mode switch ON On
Snow mode switch OFF Off
M RANGE SW Ignition switch
ONSelector lever in manual mode position On
Other than the above Off
NM RANGE SW Ignition switch
ONSelector lever in manual mode position Off
Other than the above On
AT SFT UP SW Ignition switch
ONSelector lever in + position On
Other than the above Off
AT SFT DWN SW Ignition switch
ONSelector lever in – position On
Other than the above Off
PKB SW Ignition switch
ONParking brake switch ON On
Parking brake switch OFF Off
BUCKLE SW Ignition switch
ONDriver seat belt not fastened On
Driver seat belt fastened Off
BRAKE OIL SW Ignition switch
ONBrake fluid level switch ON On
Brake fluid level switch OFF Off
A/C AMP CONN Ignition switch
ONNOTE:
This item is displayed, but cannot be moni-
tored.
Off
Monitor Item Condition Value/Status
Revision: 2010 May2011 QX56

MWI
COMBINATION METERMWI-39
< ECU DIAGNOSIS INFORMATION >
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NOTE:
Some items are not available according to vehicle specification.
TERMINAL LAYOUT
PHYSICAL VALUES
TOW MODE IND Ignition switch
ONTOW mode indicator lamp ON On
TOW mode indicator lamp OFF Off
ENTER SW Ignition switch
ONWhen switch (enter switch) is pressed
On
Other than above Off
SELECT SW Ignition switch
ONWhen switch (select switch) is pressed
On
Other than above Off
DISTANCE
[km] Ignition switch
ON
—Distance to empty calculated by com-
bination meter
OUTSIDE TEMP
[ ° C or °F] Ignition switch
ON
—Equivalent to ambient temperature
NOTE:
This may not match the indicated value
on the information display.
FUEL LOW SIG Ignition switch
ONDuring low fuel warning indication On
Other than above Off
BUZZER Ignition switch
ONBuzzer ON On
Buzzer OFF Off
Monitor Item Condition Value/Status
JPNIA0968GB
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
1
(Y) Ground Battery power supply Input Ignition
switch
OFF— Battery voltage
2
(GR) Ground Ignition signal Input Ignition
switch
ON
— Battery voltage
3
(B) Ground Ground — Ignition
switch
ON—0 V
7
(R) Ground TOW mode signal Input Ignition
switch
ONWhen TOW mode switch is
pressed
0 V
Other than the above 12 V
8
(P/L) Ground Trip reset switch signal Input Ignition
switch
ONWhen trip reset switch is
pressed
0 V
Other than the above 5 V
Revision: 2010 May2011 QX56

MWI-40
< ECU DIAGNOSIS INFORMATION >
COMBINATION METER
11
(G) Ground Enter switch signal Input Ignition
switch
ONWhen switch (enter
switch) is pressed
0 V
Other than the above 5 V
12
(O) Ground Select switch signal Input Ignition
switch
ONWhen switch (select
switch) is pressed
0 V
Other than the above 5 V
13
(W/R) Ground
Illumination control switch
signal (+) InputIgnition
switch
ON When switch [illumi-
nation control sw
itch (+)] is
pressed 0 V
Other than the above 5 V
14
(R) Ground Illumination control switch
signal (
−) InputIgnition
switch
ON When switch [illumi-
nation control switch (
−)] is
pressed 0 V
Other than the above 5 V
15
(R/W) Ground Air bag signal Input Ignition
switch
ONAir bag warning lamp
ON
4 V
Air bag warning lamp
OFF 0 V
18
(W/R) Ground Ambient sensor signal Input — —
19
(V/W) Ground A/C auto amp. connection
recognition signal Input —When A/C auto amp. is
connected
5 V
Other than the above 0 V
20
(B) Ground Ambient sensor ground — Ignition
switch
ON—0 V
21
(L) —CAN-H — — — —
22
(P) —CAN-L — — — —
23
(B) Ground Ground — Ignition
switch
ON
—0 V
24
(V) Ground Fuel level sensor ground — Ignition
switch
ON—0 V
25
(O/L) Ground Alternator signal Input Ignition
switch
ONCharge warning lamp ON 2 V
Charge warning lamp OFF Battery voltage
26
(W) Ground Parking brake switch signal Input Ignition
switch
ONParking brake applied 0 V
Parking brake released 12 V
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
JSNIA0014GB
Revision: 2010 May2011 QX56

MWI
COMBINATION METERMWI-41
< ECU DIAGNOSIS INFORMATION >
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28
(GR/R) Ground Security signal Input Ignition
switch
ONSecurity indicator lamp ON 0 V
Security indicator lamp
OFF
12 V
29
(BR) Ground Washer level switch signal Input Ignition
switch
ONWasher level switch ON 0 V
Washer level switch OFF 5 V
30
(SB) Ground
Vehicle speed signal
(2-pulse) OutputIgnition
switch
ON Speedometer operated
[When vehicle speed is ap-
prox. 40 km/h (25 MPH)] NOTE:
The maximum voltage varies de-
pending on the specification
(destination unit).
31
(BR/W) GroundVehicle speed signal
(8-pulse)
OutputIgnition
switch
ONSpeedometer operated
[When vehicle speed is ap-
prox. 40 km/h (25 MPH)] NOTE:
The maximum voltage varies de-
pending on the specification
(destination unit).
33
(W) Ground SNOW mode signal Input Ignition
switch
ONWhen SNOW mode switch
is pressed
12 V
Other than the above 0 V
34
(BR/Y) Ground Fuel level sensor signal Input Ignition
switch
ON
—
35
(O/B) Ground Seat belt buckle switch sig-
nal (driver side)
InputIgnition
switch
ON When driver side belts is
fastened
12 V
When driver side belts is
unfastened 0 V
36
(G/Y) Ground Passenger seat belt warn-
ing signal
InputIgnition
switch
ON  When driver side seat
belt fastened
 When getting in the pas- senger seat
 When passenger seat belt fastened 12 V
 When driver side seat belt fastened
 When getting in the pas- senger seat
 When passenger seat belt unfastened 0 V
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
JSNIA0015GB
JSNIA0012GB
JSNIA3013ZZ
Revision: 2010 May2011 QX56

MWI-42
< ECU DIAGNOSIS INFORMATION >
COMBINATION METER
Fail-Safe
INFOID:0000000006221722
FA I L - S A F E
The combination meter activates the fail-safe contro l if CAN communication with each unit is malfunctioning.
37
(R/Y) Ground Non-manual mode signal Input Ignition
switch
ONSelector manual mode po-
sition
12 V
Other than the above 0 V
38
(L/W) Ground Manual mode shift down
signal InputIgnition
switch
ON Selector lever DOWN oper-
ation
0 V
Other than the above 12 V
39
(Y/B) Ground Manual mode shift up sig-
nal InputIgnition
switch
ON Selector lever UP operation 0 V
Other than the above 12 V
40
(G/W) Ground Manual mode signal Input Ignition
switch
ONSelector manual mode po-
sition
0 V
Other than the above 12 V
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
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
COMBINATION METERMWI-43
< ECU DIAGNOSIS INFORMATION >
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DTC IndexINFOID:0000000006221723
Warning lamp/indicator lamp ABS warning lamp
The lamp turns ON by suspending communication.
VDC warning lamp
Brake warning lamp
IBA OFF indicator lamp
4WD warning lamp
Malfunction indicator lamp
VDC OFF indicator lamp
CRUISE warning lamp
Low tire pressure warning lamp The lamp blinking caused by suspending communication.
High beam indicator lamp
The lamp turns OFF by suspending communication.
Turn signal indicator lamp
Tail lamp indicator lamp
A/T CHECK indicator lamp
Key warning lamp
AT P w a r n i n g l a m p
Lane departure warning lamp
LDP ON indicator lamp
CRUISE indicator lamp
Oil pressure warning lamp
SNOW mode indicator lamp
TOW mode indicator lamp
CK SUSP indicator lamp
BSW indicator lamp
Function Specifications
Display contents of CONSULT-III Diagnostic item is detected when... Refer to
CAN COMM CIRCUIT
[U1000] When combination meter is not transmitting or receiving CAN communication signal
for 2 seconds or more. MWI-59,
"Diagnosis
Procedure"
CONTROL UNIT (CAN)
[U1010]
When detecting error during the initial diagnosis of the CAN controller of combina-
tion meter. MWI-60, "Diagnosis
Procedure"
VEHICLE SPEED
[B2205]
The abnormal vehicle speed signal is input from the ABS actuator and electric unit
(control unit) for
2 seconds or more. MWI-61, "Diagnosis
Procedure"
ENGINE SPEED
[B2267]
If ECM continuously transmits abnormal engine speed signals for 2 seconds or
more. MWI-62, "Diagnosis
Procedure"
WATER TEMP
[B2268]
If ECM continuously transmits abnormal engine coolant temperature signals for 60
seconds or more. MWI-63, "Diagnosis
Procedure"
Revision: 2010 May2011 QX56

MWI-44
< ECU DIAGNOSIS INFORMATION >
IPDM E/R
IPDM E/R
List of ECU ReferenceINFOID:0000000006221724
ECU Reference
IPDM E/R PCS-15, "
Reference Value"
PCS-21, "Fail-Safe"
PCS-22, "DTCIndex"
Revision: 2010 May2011 QX56

PCS
PCS-1
ELECTRICAL & POWER CONTROL
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CONTENTS
POWER CONTROL SYSTEM
IPDM E/R
PRECAUTION ................ ...............................
3
PRECAUTIONS .............................................. .....3
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
3
SYSTEM DESCRIPTION ..............................4
COMPONENT PARTS ................................... .....4
Component Parts Location .................................. ......4
SYSTEM ..............................................................5
RELAY CONTROL SYSTEM ................................ ......5
RELAY CONTROL SYSTEM : System Diagram ......5
RELAY CONTROL SYSTEM : System Descrip-
tion ...................................................................... ......
5
RELAY CONTROL SYSTEM : Fail-Safe ...................6
POWER CONTROL SYSTEM .....................................7
POWER CONTROL SYSTEM : System Diagram ......8
POWER CONTROL SYSTEM : System Descrip-
tion ...................................................................... ......
8
SIGNAL BUFFER SYSTEM ........................ ................8
SIGNAL BUFFER SYSTEM : System Diagram .. ......8
SIGNAL BUFFER SYSTEM : System Description ......8
POWER CONSUMPTION CONTROL SYSTEM ... ......8
POWER CONSUMPTION CONTROL SYSTEM :
System Diagram ........................................................
9
POWER CONSUMPTION CONTROL SYSTEM :
System Description ...................................................
9
DIAGNOSIS SYSTEM (IPDM E/R) .....................10
Diagnosis Description ......................................... ....10
CONSULT-III Function (IPDM E/R) .........................12
ECU DIAGNOSIS INFORMATION ..............15
IPDM E/R ...........................................................15
Reference Value .................................................. ....15
Fail-Safe ..................................................................21
DTC Index ...............................................................22
WIRING DIAGRAM ......................................24
IPDM E/R ...........................................................24
Wiring Diagram .................................................... ....24
DTC/CIRCUIT DIAGNOSIS .........................28
U1000 CAN COMM CIRCUIT ...........................28
Description ........................................................... ....28
DTC Logic ................................................................28
Diagnosis Procedure ...............................................28
B2098 IGNITION RELAY ON STUCK ..............29
Description ...............................................................29
DTC Logic ................................................................29
Diagnosis Procedure ...............................................29
B2099 IGNITION RELAY OFF STUCK ............30
Description ...............................................................30
DTC Logic ................................................................30
Diagnosis Procedure ...............................................30
POWER SUPPLY AND GROUND CIRCUIT ....31
Diagnosis Procedure ...............................................31
REMOVAL AND INSTALLATION ...............32
IPDM E/R ...........................................................32
Removal and Installation ..................................... ....32
POWER DISTRIBUTION SYSTEM
PRECAUTION ............... ...............................
33
PRECAUTIONS .................................................33
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ....
33
Revision: 2010 May2011 QX56