fuel INFINITI QX56 2006 Factory Owner's Guide

INDEX FOR DTCEC-9
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Revision: November 2009 2006 QX56P01530153 A/F SENSOR1 (B2) EC-241
P01570157 HO2S2 (B2) EC-253
P01580158 HO2S2 (B2) EC-264
P01590159 HO2S2 (B2) EC-277
P01710171 FUEL SYS-LEAN-B1 EC-288
P01720172 FUEL SYS-RICH-B1 EC-299
P01740174 FUEL SYS-LEAN-B2 EC-288
P01750175 FUEL SYS-RICH-B2 EC-299
P01810181 FTT SENSOR EC-309
P01820182 FTT SEN/CIRCUIT EC-315
P01830183 FTT SEN/CIRCUIT EC-315
P02220222 TP SEN 1/CIRC EC-320
P02230223 TP SEN 1/CIRC EC-320
P03000300 MULTI CYL MISFIRE EC-327
P03010301 CYL 1 MISFIRE EC-327
P03020302 CYL 2 MISFIRE EC-327
P03030303 CYL 3 MISFIRE EC-327
P03040304 CYL 4 MISFIRE EC-327
P03050305 CYL 5 MISFIRE EC-327
P03060306 CYL 6 MISFIRE EC-327
P03070307 CYL 7 MISFIRE EC-327
P03080308 CYL 8 MISFIRE EC-327
P03270327 KNOCK SEN/CIRC-B1 EC-335
P03280328 KNOCK SEN/CIRC-B1 EC-335
P03320332 KNOCK SEN/CIRC-B2 EC-335
P03330333 KNOCK SEN/CIRC-B2 EC-335
P03350335 CKP SEN/CIRCUIT EC-340
P03400340 CMP SEN/CIRC-B1 EC-347
P04200420 TW CATALYST SYS-B1 EC-354
P04300430 TW CATALYST SYS-B2 EC-354
P04410441 EVAP PURG FLOW/MON EC-360
P04420442 EVAP SMALL LEAK EC-365
P04430443 PURG VOLUME CONT/V EC-373
P04440444 PURG VOLUME CONT/V EC-381
P04450445 PURG VOLUME CONT/V EC-381
P04470447 VENT CONTROL VALVE EC-388
P04480448 VENT CONTROL VALVE EC-395
P04510451 EVAP SYS PRES SEN EC-402
P04520452 EVAP SYS PRES SEN EC-405
P04530453 EVAP SYS PRES SEN EC-411
P04550455 EVAP GROSS LEAK EC-419
P04560456 EVAP VERY SML LEAK EC-427
DTC*1
Items
(CONSULT-II screen terms) Reference page
CONSULT-II
GST*
2ECM*3

EC-10Revision: November 2009
INDEX FOR DTC
2006 QX56
P04600460 FUEL LEV SEN SLOSH EC-436
P04610461 FUEL LEVEL SENSOR EC-438
P04620462 FUEL LEVL SEN/CIRC EC-440
P04630463 FUEL LEVL SEN/CIRC EC-440
P05000500
VEH SPEED SEN/CIRC*5EC-442
P0506 0506 ISC SYSTEM EC-444
P05070507 ISC SYSTEM EC-446
P05500550 PW ST P SEN/CIRC EC-448
P06030603 ECM BACK UP/CIRCUIT EC-453
P06050605 ECM EC-457
P06430643 SENSOR POWER/CIRC EC-460
P07000700 TCM AT-104
P07050705 PNP SW/CIRC AT-105
P07100710 ATF TEMP SEN/CIRC AT-127
P07170717 TURBINE REV S/CIRC AT-109
P07200720
VEH SPD SEN/CIR AT*5AT- 111
P0740 0740 TCC SOLENOID/CIRC AT- 11 8
P07440744 A/T TCC S/V FNCTN AT-120
P07450745 L/PRESS SOL/CIRC AT-122
P08500850 P-N POS SW/CIRCUIT EC-465
P11481148 CLOSED LOOP-B1 EC-470
P11681168 CLOSED LOOP-B2 EC-470
P12111211 TCS C/U FUNCTN EC-471
P12121212 TCS/CIRC EC-472
P12171217 ENG OVER TEMP EC-473
P12251225 CTP LEARNING EC-483
P12261226 CTP LEARNING EC-485
P15641564 ASCD SW EC-487 (Models with ICC)
EC-494
(Models with ASCD)
P1568 1568
ACC COMMAND VALUE*
7EC-501
P1572 1572 ASCD BRAKE SW EC-502 (Models with ICC)
EC-511
(Models with ASCD)
P1574 1574
ASCD VHL SPD SEN*
6EC-519 (Models with ICC)
EC-521
(Models with ASCD)
P1610 - P1615 1610 - 1615 NATS MALFUNCTION BL-137
P17301730 A/T INTERLOCK AT-134
P17521752 I/C SOLENOID/CIRC AT-139
P17541754 I/C SOLENOID FNCTN AT-141
P17571757 FR/B SOLENOID/CIRC AT-143
P17591759 FR/B SOLENOID FNCT AT-145
P17621762 D/C SOLENOID/CIRC AT-147
P17641764 D/C SOLENOID FNCTN AT-149
P17671767 HLR/C SOL/CIRC AT-151
DTC*1
Items
(CONSULT-II screen terms) Reference page
CONSULT-II
GST*
2ECM*3

INDEX FOR DTCEC-13
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Revision: November 2009 2006 QX56CTP LEARNINGP12251225 EC-483
CTP LEARNING P12261226 EC-485
CYL 1 MISFIRE P03010301 EC-327
CYL 2 MISFIRE P03020302 EC-327
CYL 3 MISFIRE P03030303 EC-327
CYL 4 MISFIRE P03040304 EC-327
CYL 5 MISFIRE P03050305 EC-327
CYL 6 MISFIRE P03060306 EC-327
CYL 7 MISFIRE P03070307 EC-327
CYL 8 MISFIRE P03080308 EC-327
D/C SOLENOID/CIRC P17621762 AT-147
D/C SOLENOID FNCTN P17641764 AT-149
ECM P06050605 EC-457
ECM BACK UP/CIRCUIT P06030603 EC-453
ECT SEN/CIRC P01170117 EC-192
ECT SEN/CIRC P01180118 EC-192
ECT SENSOR P01250125 EC-205
ENG OVER TEMP P12171217 EC-473
ETC ACTR P21192119 EC-545
ETC FUNCTION/CIRC P21012101 EC-534
ETC MOT P21182118 EC-540
ETC MOT PWR P21032103 EC-528
ETC MOT PWR P21002100 EC-528
EVAP GROSS LEAK P04550455 EC-419
EVAP PURG FLOW/MON P04410441 EC-360
EVAP SMALL LEAK P04420442 EC-365
EVAP SYS PRES SEN P04510451 EC-402
EVAP SYS PRES SEN P04520452 EC-405
EVAP SYS PRES SEN P04530453 EC-411
EVAP VERY SML LEAK P04560456 EC-427
FR/B SOLENOID/CIRC P17571757 AT-143
FR/B SOLENOID FNCT P17591759 AT-145
FTT SEN/CIRCUIT P01820182 EC-315
FTT SEN/CIRCUIT P01830183 EC-315
FTT SENSOR P01810181 EC-309
FUEL LEV SEN SLOSH P04600460 EC-436
FUEL LEVEL SENSOR P04610461 EC-438
FUEL LEVL SEN/CIRC P04620462 EC-440
FUEL LEVL SEN/CIRC P04630463 EC-440
FUEL SYS-LEAN-B1 P01710171 EC-288
FUEL SYS-LEAN-B2 P01740174 EC-288
FUEL SYS-RICH-B1 P01720172 EC-299
Items
(CONSULT-II screen terms) DTC*
1
Reference page
CONSULT-II
GST*
2ECM*3

EC-14Revision: November 2009
INDEX FOR DTC
2006 QX56
FUEL SYS-RICH-B2P01750175 EC-299
HLR/C SOL/CIRC P17671767 AT-151
HLR/C SOL FNCTN P17691769 AT-153
HO2S2 (B1) P01370137 EC-253
HO2S2 (B1) P01380138 EC-264
HO2S2 (B1) P01390139 EC-277
HO2S2 (B2) P01570157 EC-253
HO2S2 (B2) P01580158 EC-264
HO2S2 (B2) P01590159 EC-277
HO2S2 HTR (B1) P00370037 EC-163
HO2S2 HTR (B1) P00380038 EC-163
HO2S2 HTR (B2) P00570057 EC-163
HO2S2 HTR (B2) P00580058 EC-163
I/C SOLENOID/CIRC P17521752 AT-139
I/C SOLENOID FNCTN P17541754 AT-141
IAT SEN/CIRCUIT P01120112 EC-188
IAT SEN/CIRCUIT P01130113 EC-188
IAT SENSOR P01270127 EC-208
ISC SYSTEM P05060506 EC-444
ISC SYSTEM P05070507 EC-446
KNOCK SEN/CIRC-B1 P03270327 EC-335
KNOCK SEN/CIRC-B1 P03280328 EC-335
KNOCK SEN/CIRC-B2 P03320332 EC-335
KNOCK SEN/CIRC-B2 P03330333 EC-335
L/PRESS SOL/CIRC P07450745 AT-122
LC/B SOLENOID/CIRC P17721772 AT-155
LC/B SOLENOID FNCT P17741774 AT-157
MAF SEN/CIRCUIT P01010101 EC-171
MAF SEN/CIRCUIT P01020102 EC-180
MAF SEN/CIRCUIT P01030103 EC-180
MULTI CYL MISFIRE P03000300 EC-327
NATS MALFUNCTION P1610 - P16151610 - 1615 BL-137
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED. P0000
0000 —
P-N POS SW/CIRCUIT P08500850 EC-465
PNP SW/CIRC P07050705 AT-105
PURG VOLUME CONT/V P04430443 EC-373
PURG VOLUME CONT/V P04440444 EC-381
PURG VOLUME CONT/V P04450445 EC-381
PW ST P SEN/CIRC P05500550 EC-448
SENSOR POWER/CIRC P06430643 EC-460
TCC SOLENOID/CIRC P07400740 AT- 11 8
Items
(CONSULT-II screen terms) DTC*
1
Reference page
CONSULT-II
GST*
2ECM*3

EC-16Revision: November 2009
PRECAUTIONS
2006 QX56
PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
UBS00KZ0
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER ”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:

To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
On Board Diagnostic (OBD) System of Engine and A/TUBS00KZ1
The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn the
driver of a malfunction causing emission deterioration.
CAUTION:

Be sure to turn the ignition switch OFF and disconnect the negative battery cable before any
repair or inspection work. The open/short circuit of related switches, sensors, solenoid valves,
etc. will cause the MIL to light up.

Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MIL to light up due to the open circuit. (Be sure the connector is free from water, grease,
dirt, bent terminals, etc.)

Certain systems and components, especially those related to OBD, may use a new style slide-
locking type harness connector. For description and how to disconnect, refer to PG-68, "
HAR-
NESS CONNECTOR" .

Be sure to route and secure the harnesses properly after work. The interference of the harness
with a bracket, etc. may cause the MIL to light up due to the short circuit.

Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube
may cause the MIL to light up due to the malfunction of the EVAP system or fuel injection system,
etc.

Be sure to erase the unnecessary malfunction information (repairs completed) from the ECM and
TCM (Transmission control module) before returning the vehicle to the customer.
PrecautionUBS00KZ2

Always use a 12 volt battery as power source.

Do not attempt to disconnect battery cables while engine is
running.

Before connecting or disconnecting the ECM harness con-
nector, turn ignition switch OFF and disconnect negative
battery cable. Failure to do so may damage the ECM
because battery voltage is applied to ECM even if ignition
switch is turned OFF.

Before removing parts, turn ignition switch OFF and then
disconnect negative battery cable.
SEF289H

PRECAUTIONSEC-19
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Revision: November 2009 2006 QX56

Do not operate fuel pump when there is no fuel in lines.

Tighten fuel hose clamps to the specified torque.

Do not depress accelerator pedal when starting.

Immediately after starting, do not rev up engine unneces-
sarily.

Do not rev up engine just prior to shutdown.

When installing C.B. ham radio or a mobile phone, be sure
to observe the following as it may adversely affect elec-
tronic control systems depending on installation location.
–Keep the antenna as far as possible from the electronic
control units.
–Keep the antenna feeder line more than 20 cm (8 in) away
from the harness of electronic controls.
Do not let them run parallel for a long distance.
–Adjust the antenna and feeder line so that the standing-
wave radio can be kept smaller.
–Be sure to ground the radio to vehicle body.
BBIA0402E
SEF709Y
SEF708Y

EC-20Revision: November 2009
PREPARATION
2006 QX56
PREPARATIONPFP:00002
Special Service ToolsUBS00KZ4
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.Tool number
(Kent-Moore No.)
Tool name Description
EG17650301
(J-33984-A)
Radiator cap tester
adapter Adapting radiator cap tester to radiator cap and ra-
diator filler neck
a: 28 (1.10) dia.
b: 31.4 (1.236) dia.
c: 41.3 (1.626) dia.
Unit: mm (in)
KV10117100
(J-36471-A)
Heated oxygen sensor
wrench Loosening or tightening heated oxygen sensors
with 22 mm (0.87 in) hexagon nut
KV10114400
(J-38365)
Heated oxygen sensor
wrench Loosening or tightening heated oxygen sensors
a: 22 mm (0.87 in)
(J-44626)
Air fuel ratio (A/F) sen-
sor wrench Loosening or tightening air fuel ratio (A/F) sensor 1
(J-44321)
Fuel pressure gauge
kit Checking fuel pressure
(J-44321-6)
Fuel pressure adapter Connecting fuel pressure gauge to quick connec-
tor type fuel lines.
(J-45488)
Quick connector re-
lease Remove fuel tube quick connectors in engine
room.
S-NT564
S-NT379
S-NT636
LEM054
LEC642
LBIA0376E
PBIC0198E

EC-22Revision: November 2009
PREPARATION
2006 QX56
Commercial Service ToolsUBS00KZ5
Tool name
(Kent-Moore No.)Description
Leak detector
i.e.: (J-41416) Locating the EVAP leak
EVAP service port
adapter
i.e.: (J-41413-OBD) Applying positive pressure through EVAP service
port
Fuel filler cap adapter
i.e.: (MLR-8382) Checking fuel tank vacuum relief valve opening
pressure
Socket wrench Removing and installing engine coolant tempera- ture sensor
Oxygen sensor thread
cleaner
i.e.: (J-43897-18)
(J-43897-12) Reconditioning the exhaust system threads before
installing a new oxygen sensor. Use with anti-
seize lubricant shown below.
a: 18 mm diameter with pitch 1.5 mm for Zirco-
nia Oxygen Sensor
b: 12 mm diameter with pitch 1.25 mm for Tita-
nia Oxygen Sensor
Anti-seize lubricant
i.e.: (Permatex
TM
133AR or equivalent
meeting MIL specifica-
tion MIL-A-907) Lubricating oxygen sensor thread cleaning tool
when reconditioning exhaust system threads.
S-NT703
S-NT704
S-NT815
S-NT705
AEM488
S-NT779

EC-24Revision: November 2009
ENGINE CONTROL SYSTEM
2006 QX56
Multiport Fuel Injection (MFI) SystemUBS00KZ7
INPUT/OUTPUT SIGNAL CHART
*1: This sensor is not used to control the engine system. This is used only for the on board diagnosis.
*2: This signal is sent to the ECM through CAN communication line.
*3: ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the length of
time the valve remains open (injection pulse duration). The amount of fuel injected is a program value in the
ECM memory. The program value is preset by engine operating conditions. These conditions are determined
by input signals (for engine speed and intake air) from both the crankshaft position sensor and the mass air
flow sensor.
VARIOUS FUEL INJECTION INCREASE/DECREASE COMPENSATION
In addition, the amount of fuel injected is compensated to improve engine performance under various operat-
ing conditions as listed below.
<Fuel increase>

During warm-up

When starting the engine

During acceleration

Hot-engine operation

When selector lever is changed from N to D

High-load, high-speed operation
<Fuel decrease>

During deceleration

During high engine speed operation
Sensor Input signal to ECMECM functionActuator
Crankshaft position sensor (POS) Engine speed*
3
Piston position
Fuel injection
& mixture ratio
controlFuel injector
Camshaft position sensor (PHASE)
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Air fuel ratio (A/F) sensor 1 Density of oxygen in exhaust gas
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
Park/neutral position (PNP) switch Gear position
Knock sensor Engine knocking condition
Battery Battery voltage*
3
Power steering pressure sensorPower steering operation
Heated oxygen sensor 2 Density of oxygen in exhaust gas*
1
ABS actuator and electric unit (control unit)VDC/TCS operation command*2
Air conditioner switch
Air conditioner operation*2
Wheel sensorVehicle speed*2

ENGINE CONTROL SYSTEMEC-25
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Revision: November 2009 2006 QX56
MIXTURE RATIO FEEDBACK CONTROL (CLOSED LOOP CONTROL)
The mixture ratio feedback system provides the best air-fuel mixture ratio for driveability and emission control.
The three way catalyst (manifold) can then better reduce CO, HC and NOx emissions. This system uses air
fuel ratio (A/F) sensor 1 in the exhaust manifold to monitor whether the engine operation is rich or lean. The
ECM adjusts the injection pulse width according to the sensor voltage signal. For more information about air
fuel ratio (A/F) sensor 1, refer to EC-213, "
DTC P0130, P0150 A/F SENSOR 1" . This maintains the mixture
ratio within the range of stoichiometric (ideal air-fuel mixture).
This stage is referred to as the closed loop control condition.
Heated oxygen sensor 2 is located downstream of the three way catalyst (manifold). Even if the switching
characteristics of air fuel ratio (A/F) sensor 1 shift, the air-fuel ratio is controlled to stoichiometric by the signal
from heated oxygen sensor 2.
Open Loop Control
The open loop system condition refers to when the ECM detects any of the following conditions. Feedback
control stops in order to maintain stabilized fuel combustion.

Deceleration and acceleration

High-load, high-speed operation

Malfunction of A/F sensor 1 or its circuit

Insufficient activation of A/F sensor 1 at low engine coolant temperature

High engine coolant temperature

During warm-up

After shifting from N to D

When starting the engine
MIXTURE RATIO SELF-LEARNING CONTROL
The mixture ratio feedback control system monitors the mixture ratio signal transmitted from A/F sensor 1.
This feedback signal is then sent to the ECM. The ECM controls the basic mixture ratio as close to the theoret-
ical mixture ratio as possible. However, the basic mixture ratio is not necessarily controlled as originally
designed. Both manufacturing differences (i.e., mass air flow sensor hot wire) and characteristic changes dur-
ing operation (i.e., injector clogging) directly affect mixture ratio.
Accordingly, the difference between the basic and theoretical mixture ratios is monitored in this system. This is
then computed in terms of “injection pulse duration” to automatically compensate for the difference between
the two ratios.
“Fuel trim ” refers to the feedback compensation value compared against the basic injection duration. Fuel trim
includes short term fuel trim and long term fuel trim.
“Short term fuel trim ” is the short-term fuel compensation used to maintain the mixture ratio at its theoretical
value. The signal from A/F sensor 1 indicates whether the mixture ratio is RICH or LEAN compared to the the-
oretical value. The signal then triggers a reduction in fuel volume if the mixture ratio is rich, and an increase in
fuel volume if it is lean.
“Long term fuel trim ” is overall fuel compensation carried out long-term to compensate for continual deviation
of the short term fuel trim from the central value. Such deviation will occur due to individual engine differences,
wear over time and changes in the usage environment.
PBIB3020E