2007 INFINITI QX56 check engine light

BL-124
< SERVICE INFORMATION >
IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS)
Self-diagnosis related item
*: When IVIS (NATS) detects a malfunction, the security indicator lights up while ignition key is in the “ON” position.
SYMPTOM MATRIX CHART 2
SymptomDisplayed “SELF-DIAG
RESULTS” on CON-
SULT-II screen.Diagnostic Procedure
(Reference page)System
(Malfunctioning part or
mode)Reference Part No. Of Il-
lustration On System Di-
agram
• Security indicator light-
ing up*
• Engine cannot be
startedCHAIN OF ECM-IMMU
[P1612]PROCEDURE 1
(BL-125
)In rare case, “CHAIN OF
ECM-IMMU” might be
stored during key regis-
tration procedure, even if
the system is not mal-
functioning.—
Open circuit in battery
voltage line of BCM cir-
cuitC1
Open circuit in ignition
line of BCM circuitC2
Open circuit in ground
line of BCM circuitC3
Open or short circuit be-
tween BCM and ECM
communication lineC4
ECM B
BCM A
DIFFERENCE OF KEY
[P1615]PROCEDURE 2
(BL-126
)Unregistered key D
BCM A
CHAIN OF IMMU-KEY
[P1614]PROCEDURE 5
(BL-129
)Malfunction of key ID
chipE5
Communication line be-
tween ANT/ AMP and
BCM:
Open circuit or short cir-
cuit of battery voltage
line or ground lineE1
E2
Open circuit in power
source line of ANT/ AMP
circuitE3
Open circuit in ground
line of ANT/ AMP circuitE4
NATS antenna amp. E6
BCM A
ID DISCORD, IMM-ECM
[P1611]PROCEDURE 3
(BL-127
)System initialization has
not yet been completed.F
ECM B
LOCK MODE
[P1610]PROCEDURE 4
(BL-128
)LOCK MODE D
Security indicator lighting
up*DON'T ERASE BEFORE
CHECKING ENG DIAGWORK FLOW
(BL-123
)Engine trouble data and
IVIS (NATS) trouble data
have been detected in
ECM—

IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS)
BL-131
< SERVICE INFORMATION >
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OK or NG
OK >> GO TO 7.
NG >> • Repair or replace harness.
NOTE:
If harness is OK, replace BCM, perform initialization with CONSULT-II. For initialization, refer to
“CONSULT-II Operation Manual NATS-IVIS/NVIS”.
7.CHECK NATS ANTENNA AMP. GROUND LINE CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect NATS antenna amp. connector.
3. Check continuity between NATS antenna amp. connector M21 terminal 3 and ground.
OK or NG
OK >> NATS antenna amp. is malfunctioning. Ref. part No. E6
NG >> • Repair or replace harness.
NOTE:
If harness is OK, replace BCM, perform initialization
with CONSULT-II. For initialization, refer to “CON-
SULT-II Operation Manual NATS-IVIS/NVIS”.
Diagnosis Procedure 6INFOID:0000000003533000
“SECURITY INDICATOR LAMP DOES NOT LIGHT UP”
1.CHECK FUSE
Check 10A fuse [No.19, located in the fuse block (J/B)]
OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.
2.CHECK SECURITY INDICATOR LAMP
1. Start engine and turn ignition switch OFF.
2. Check the security indicator lamp lights up.
OK or NG
OK >> Inspection End.
NG >> GO TO 3.
3.CHECK SECURITY INDICATOR LAMP POWER SUPPLY CIRCUIT
1. Disconnect security indicator lamp.
Connector terminals
(wire colors)
Position of ignition key cylinderVoltage (V)
(Approx.)
( + ) ( - )
4GroundBefore inserting ignition key Battery voltage
After inserting ignition keyPointer of tester should move for approx. 30 seconds,
then return to battery voltage
Just after turning ignition switch
ONPointer of tester should move for approx. 1 second, then
return to battery voltage
3 - Ground :Continuity should exist.
LIIA1283E
Security indicator lamp should light up.

BRC-4
< SERVICE INFORMATION >[VDC/TCS/ABS]
PRECAUTIONS
• If YES, GO TO 2.
• If NO, GO TO 5.
2. Is there any indication other than indications relating to CAN communication system in the self-diagnosis
results?
• If YES, GO TO 3.
• If NO, GO TO 4.
3. Based on self-diagnosis results unrelated to CAN communication, carry out the inspection.
4. Malfunctions may be detected in self-diagnosis depending on control units carrying out CAN communica-
tion. Therefor, erase the self-diagnosis results.
5. Diagnose CAN communication system. Refer to LAN-7
.
Precaution for Brake ControlINFOID:0000000003532764
• During ABS operation, the brake pedal may vibrate lightly and a mechanical noise may be heard. This is
normal.
• Just after starting vehicle, the brake pedal may vibrate or a motor operating noise may be heard from engine
compartment. This is a normal status of operation check.
• Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel, or
snow-covered (fresh, deep snow) roads.
• When an error is indicated by ABS or another warning lamp, collect all necessary information from customer
(what symptoms are present under what conditions) and check for simple causes before starting diagnosis.
Besides electrical system inspection, check booster operation, brake fluid level, and fluid leaks.
• If incorrect tire sizes or types are installed on the vehicle or brake pads are not Genuine NISSAN parts, stop-
ping distance or steering stability may deteriorate.
• If there is a radio, antenna or related wiring near control module, ABS function may have a malfunction or
error.
• If aftermarket parts (car stereo, CD player, etc.) have been installed, check for incidents such as harness
pinches, open circuits or improper wiring.
• If the following components are replaced with non-genuine components or modified, the VDC OFF indicator
lamp and SLIP indicator lamp may turn on or the VDC system may not operate properly. Components
related to suspension (shock absorbers, struts, springs, bushings, etc.), tires, wheels (exclude specified
size), components related to brake system (pads, rotors, calipers, etc.), components related to engine (muf-
fler, ECM, etc.), components related to body reinforcement (roll bar, tower bar, etc.).
• Driving with broken or excessively worn suspension components, tires or brake system components may
cause the VDC OFF indicator lamp and the SLIP indicator lamp to turn on, and the VDC system may not
operate properly.
• When the TCS or VDC is activated by sudden acceleration or sudden turn, some noise may occur. The
noise is a result of the normal operation of the TCS and VDC.
• When driving on roads which have extreme slopes (such as mountainous roads) or high banks (such as
sharp curves on a freeway), the VDC may not operate normally, or the VDC warning lamp and the SLIP indi-
cator lamp may turn on. This is not a problem if normal operation can be resumed after restarting the engine.
• Sudden turns (such as spin turns, acceleration turns), drifting, etc. with VDC turned off may cause the yaw
rate/side/decel G sensor to indicate a problem. This is not a problem if normal operation can be resumed
after restarting the engine.
Precaution for CAN SystemINFOID:0000000003532765
• Do not apply voltage of 7.0V or higher to terminal to be measured.
• Maximum open terminal voltage of tester in use must be less than 7.0V.
• Before checking harnesses, turn ignition switch OFF and disconnect battery negative cable.

BRC-8
< SERVICE INFORMATION >[VDC/TCS/ABS]
SYSTEM DESCRIPTION
ABS Function
INFOID:0000000003532769
• The Anti-Lock Brake System detects wheel revolution while braking and improves handling stability during
sudden braking by electrically preventing wheel lockup. Maneuverability is also improved for avoiding obsta-
cles.
• If the electrical system malfunctions, the Fail-Safe function is activated, the ABS becomes inoperative and
the ABS warning lamp turns on.
• The electrical system can be diagnosed using CONSULT-II.
• During ABS operation, the brake pedal may vibrate lightly and a mechanical noise may be heard. This is
normal.
• Just after starting the vehicle, the brake pedal may vibrate or a motor operating noise may be heard from
engine compartment. This is a normal status of operation check.
• Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel, or
snow-covered (fresh, deep snow) roads.
EBD FunctionINFOID:0000000003532770
• Electronic Brake Distribution is a function that detects subtle slippages between the front and rear wheels
during braking, and it improves handling stability by electronically controlling the brake fluid pressure which
results in reduced rear wheel slippage.
• If the electrical system malfunctions, the Fail-Safe function is activated, the EBD and ABS become inopera-
tive, and the ABS warning lamp and BRAKE warning lamp are turned on.
• The electrical system can be diagnosed using CONSULT-II.
• During EBD operation, the brake pedal may vibrate lightly and a mechanical noise may be heard. This is
normal.
• Just after starting the vehicle, the brake pedal may vibrate or a motor operating noise may be heard from
engine compartment. This is a normal status of operation check.
TCS FunctionINFOID:0000000003532771
• Spinning of the drive wheels is detected by the ABS actuator and electric unit (control unit) using inputs from
the wheel speed sensors. If wheel spin occurs, the drive wheel right and left brake fluid pressure control and
engine fuel cut are activated while the throttle value is restricted to reduce the engine torque and decrease
the amount of wheel spin. In addition, the throttle opening is controlled to achieve the optimum engine
torque.
• Depending on road condition, the vehicle may have a sluggish feel. This is normal, because optimum trac-
tion has the highest priority during TCS operation.
• TCS may be activated during sudden vehicle acceleration, wide open throttle acceleration, sudden transmis-
sion shifts or when the vehicle is driven on a road with a varying surface friction coefficient.
• The SLIP indicator lamp flashes to inform the driver of TCS operation.
VDC FunctionINFOID:0000000003532772
• In addition to the ABS/TCS function, the driver steering amount and brake operation amount are detected
from the steering angle sensor and front and rear pressure sensors, and the vehicle's driving status (amount
of under steering/over steering) is determined using inputs from the yaw rate sensor/side G sensor, wheel
speed sensors, etc. and this information is used to improve vehicle stability by controlling the braking and
engine torque application to the wheels.
• The SLIP indicator lamp flashes to inform the driver of VDC operation.
• During VDC operation, the vehicle body and brake pedal may vibrate lightly and a mechanical noise may be
heard. This is normal.
• The ABS warning lamp, VDC OFF indicator lamp and SLIP indicator lamp may turn on when the vehicle is
subject to strong shaking or large vibration, such as when the vehicle is on a turn table or a ship while the
engine is running or on a steep slope. In this case, restart the engine on a normal road and if the ABS warn-
ing lamp, VDC OFF indicator lamp and SLIP indicator lamp turn off, there is no problem.
Fail-Safe FunctionINFOID:0000000003532773
CAUTION:
If the Fail-Safe function is activated, perform the Self Diagnosis for ABS/TCS/VDC system.
ABS/EBD SYSTEM

ENGINE COOLANT
CO-11
< SERVICE INFORMATION >
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3. Remove the vented reservoir cap and replace it with a non-vented reservoir cap before filling the cooling
system.
4. Install the Tool by installing the radiator cap adapter onto the
radiator neck opening. Then attach the gauge body assembly
with the refill tube and the venturi assembly to the radiator cap
adapter.
5. Insert the refill hose into the coolant mixture container that is
placed at floor level. Make sure the ball valve is in the closed
position.
• Use recommended NISSAN Long Life Anti-freeze coolant or
equivalent. Refer to MA-10, "
SAE Viscosity Number".
6. Install an air hose to the venturi assembly, the air pressure must
be within specification.
CAUTION:
The compressed air supply must be equipped with an air
dryer.
7. The vacuum gauge will begin to rise and there will be an audible hissing noise. During this process open
the ball valve on the refill hose slightly. Coolant will be visible rising in the refill hose. Once the refill hose is
full of coolant, close the ball valve. This will purge any air trapped in the refill hose.
8. Continue to draw the vacuum until the gauge reaches 28 inches
of vacuum. The gauge may not reach 28 inches in high altitude
locations, refer to the vacuum specifications based on the alti-
tude above sea level.
9. When the vacuum gauge has reached the specified amount, disconnect the air hose and wait 20 seconds
to see if the system loses any vacuum. If the vacuum level drops, perform any necessary repairs to the
system and repeat steps 6 - 8 to bring the vacuum to the specified amount. Recheck for any leaks.
10. Place the coolant container (with the refill hose inserted) at the same level as the top of the radiator. Then
open the ball valve on the refill hose so the coolant will be drawn up to fill the cooling system. The cooling
system is full when the vacuum gauge reads zero.
CAUTION:
Do not allow the coolant container to get too low when filling, to avoid air from being drawn into
the cooling system.
11. Remove the Tool from the radiator neck opening and install the radiator cap.
12. Remove the non-vented reservoir cap.
13. Fill the cooling system reservoir tank to the specified level. Run the engine to warm up the cooling system
and top up the system as necessary before installing the vented reservoir cap.
FLUSHING COOLING SYSTEM
Tool number : KV991J0070 (J-45695)
Cooling system capacity
(with reservoir): Refer to MA-10, "
Fluids
and Lubricants".
Compressed air
supply pressure: 5.7 - 8.5 kPa (5.6 - 8.4 kg/cm
2,
80 - 120 psi)
LLIA0058E
Altitude above sea level Vacuum gauge reading
0 - 100 m (328 ft) : 28 inches of vacuum
300 m (984 ft) : 27 inches of vacuum
500 m (1,641 ft) : 26 inches of vacuum
1,000 m (3,281 ft) : 24 - 25 inches of vacuum
LLIA0057E

DI-1
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CONTENTS
DRIVER INFORMATION SYSTEM
SERVICE INFORMATION .. ..........................3
PRECAUTION ................................................ .....3
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
3
PREPARATION ...................................................4
Commercial Service Tool .................................... ......4
COMBINATION METERS ...................................5
Component Parts and Harness Connector Loca-
tion ...................................................................... ......
5
System Description ...................................................5
Arrangement of Combination Meter ..........................7
Internal Circuit ...........................................................8
Wiring Diagram - METER - .......................................9
Combination Meter Harness Connector Terminal
Layout .....................................................................
11
Terminal and Reference Value for Combination
Meter .......................................................................
11
Self-Diagnosis Mode of Combination Meter ........ ....12
How to Proceed with Trouble Diagnosis ............. ....15
Preliminary Check ...................................................15
Symptom Chart .......................................................16
Power Supply and Ground Circuit Inspection .........16
Vehicle Speed Signal Inspection .............................17
Engine Oil Pressure Signal Inspection ....................17
Water Temperature Signal Inspection .....................18
Engine Speed Signal Inspection ......................... ....18
Fuel Level Sensor Unit Inspection ...................... ....18
Fuel Gauge Fluctuates, Indicates Wrong Value, or
Varies .................................................................. ....
20
Fuel Gauge Does Not Move to Full-position ...........20
Electrical Component Inspection ......................... ....21
Removal and Installation of Combination Meter .....21
COMPASS AND THERMOMETER ................ ....22
System Description ............................................. ....22
Wiring Diagram - COMPAS - ..................................23
Trouble Diagnosis ............................................... ....23
Calibration Procedure for Compass .................... ....24
WARNING LAMPS ............................................26
Schematic ............................................................ ....26
Wiring Diagram - WARN - .......................................27
Oil Pressure Warning Lamp Stays Off (Ignition
Switch ON) .......................................................... ....
32
Oil Pressure Warning Lamp Does Not Turn Off
(Oil Pressure Is Normal) ...................................... ....
33
A/T INDICATOR ................................................34
Wiring Diagram - AT/IND - .......................................34
A/T Indicator Does Not Illuminate ............................34
WARNING CHIME .............................................36
Component Parts and Harness Connector Loca-
tion ....................................................................... ....
36
System Description ..................................................36
CAN Communication System Description ...............37
Wiring Diagram - CHIME - .......................................38
Terminal and Reference Value for BCM ..................39
Terminal and Reference Value for Combination
Meter ................................................................... ....
39
How to Proceed with Trouble Diagnosis ..................40
Preliminary Check ............................................... ....40
CONSULT-II Function (BCM) ..................................40
All Warning Chimes Do Not Operate .......................41
Key Warning Chime and Light Warning Chime Do
Not Operate (Seat Belt Warning Chime Does Op-
erate) .......................................................................
41
Key Warning Chime Does Not Operate ...................42
Light Warning Chime Does Not Operate .................44
Seat Belt Warning Chime Does Not Operate ..........44
REAR SONAR SYSTEM ...................................46
Component Parts and Harness Connector Loca-
tion ....................................................................... ....
46
System Description ..................................................46
Wiring Diagram - SONAR - ......................................48
Sonar Control Unit Harness Connector Terminal
Layout ......................................................................
50

COMBINATION METERSDI-13
< SERVICE INFORMATION >
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Next test requested EprXX Displays 8-bit software
configuration value in Hex
format.Bit Coding
7-2 = reserved for future use
1 = A/T Oil Temp (gauge)
0 = not present
1 = present
1 = Odo Units 0 = kilometers
1 = miles
Next test requested 1nFXX Displays 8-bit market info
value in Hex format.$31 = USA
$2A = Canada
Next test requested cYLXX Displays 8-bit engine con-
figuration value in Hex for-
mat.$08 = 8 cylinder
$06 = 6 cylinder
Next test requested bulb Illuminates all micro-con-
trolled lamps/LEDs re-
gardless of SW
configuration.
Next test requested D-HI Meter/LCD Illumination.
Next test requested (All segments illuminated) Lights all odometer/trip
meter, fuel, and engine
temperature display seg-
ments.Full daytime brightness all LCD
segments active
Next test requested N-HI Meter/LCD Illumination.
Next test requested (All segments illuminated) Lights all odometer/trip
meter, fuel, and engine
temperature display seg-
ments.Full nighttime brightness all
LCD segments active
Next test requested N-LO Meter/LCD Illumination.
Next test requested (All segments illuminated) Lights all odometer/trip
meter, fuel, and engine
temperature display seg-
ments.Min. nighttime brightness all
LCD segments active
Next test requested dS XX Current dimming step. 1-21
Next test requested EE XX, FAIL Hex EE level. If EE check-
sum fault exists, display
alternates between "EE
XX" and "FAIL".
Next test requested dtXXXX Hex coding of final manu-
facturing test date.
Next test requested GAGE Performs sweep of all
gauges, then displays
present gauge values.
Performs checksum tests
on ROM and EE.Gauges sweep within 10 sec-
onds
Next test requested FFXXXX Displays 16-bit fuel flow
constant "Q" in tenths of
cc/min in Hex format.$0000 - $FFFF
Next test requested tF Displays 16-bit tire factor
"A" in hundredths in Hex
format.$0000 - $FFFF
Next test requested oP Current oil pressure value
in A/D counts in hex for-
mat.
$00 - $FF
Next test requested ot1XX Displays oil pressure tell-
tale "on" threshold in A/D
counts in Hex format.$00 - $FF
Event Odometer Display Description of Test/Data Notes:

EC-48
< SERVICE INFORMATION >
ON BOARD DIAGNOSTIC (OBD) SYSTEM
ON BOARD DIAGNOSTIC (OBD) SYSTEM
IntroductionINFOID:0000000003531604
The ECM has an on board diagnostic system, which detects malfunctions related to engine sensors or actua-
tors. The ECM also records various emission-related diagnostic information including:
The above information can be checked using procedures listed in the table below.
×: Applicable —: Not applicable
*: When DTC and 1st trip DTC simultaneously appear on the display, they cannot be clearly distinguished from each other.
The malfunction indicator lamp (MIL) on the instrument panel lights up when the same malfunction is detected
in two consecutive trips (Two trip detection logic), or when the ECM enters fail-safe mode. (Refer to EC-88,
"Fail-Safe Chart".)
Two Trip Detection LogicINFOID:0000000003531605
When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are stored in the
ECM memory. The MIL will not light up at this stage. <1st trip>
If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored in
the ECM memory, and the MIL lights up. The MIL lights up at the same time when the DTC is stored. <2nd
trip> The “trip” in the “Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed
during vehicle operation. Specific on board diagnostic items will cause the ECM to light up or blink the MIL,
and store DTC and Freeze Frame data, even in the 1st trip, as shown below.
×: Applicable —: Not applicable
When there is an open circuit on MIL circuit, the ECM cannot warn the driver by lighting up MIL when there is
malfunction on engine control system.
Emission-related diagnostic information Diagnostic service
Diagnostic Trouble Code (DTC) Service $03 of SAE J1979
Freeze Frame data Service $02 of SAE J1979
System Readiness Test (SRT) code Service $01 of SAE J1979
1st Trip Diagnostic Trouble Code (1st Trip DTC) Service $07 of SAE J1979
1st Trip Freeze Frame data
Test values and Test limits Service $06 of SAE J1979
Calibration ID Service $09 of SAE J1979
DTC 1st trip DTCFreeze
Frame data1st trip Freeze
Frame dataSRT code SRT status Test value
CONSULT-II×× × × × ×—
GST×× ×—×××
ECM××*— — —×—
ItemsMIL DTC 1st trip DTC
1st trip 2nd trip
1st trip
displaying2nd trip
displaying1st trip
displaying2nd trip
display-
ing BlinkingLighting
upBlinkingLighting
up
Misfire (Possible three way catalyst
damage) — DTC: P0300 - P0308 is
being detected×———— —×—
Misfire (Possible three way catalyst
damage) — DTC: P0300 - P0308 is
being detected——×——×——
One trip detection diagnoses (Re-
fer to EC-49, "
Emission-related Di-
agnostic Information".)—×——×———
Except above — — —×—××—