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Page 1199 of 3419

INFINITI QX4 2005 Factory Service Manual EC-8Revision: October 2005
INDEX FOR DTC
2005 QX56
INDEX FOR DTCPFP:00024
DTC No. IndexUBS00KYY
NOTE:
If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC U10

Page 1200 of 3419

INFINITI QX4 2005 Factory Service Manual INDEX FOR DTC
EC-9
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EC
Revision: October 20052005 QX56P0304 0304 CYL 4 MISFIREEC-271
P0305 0305 CYL 5 MISFIREEC-271
P0306 0306 CYL 6 MISFIREEC-271
P0307 0307 CYL 7 MISFIREEC-271

Page 1204 of 3419

INFINITI QX4 2005 Factory Service Manual INDEX FOR DTC
EC-13
C
D
E
F
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EC
Revision: October 20052005 QX56CMP SEN/CIRC-B1 P0340 0340EC-291
CTP LEARNING P1225 1225EC-450
CTP LEARNING P1226 1226EC-452
CYL 1 MISFIRE P0301 0301EC-271

Page 1205 of 3419

INFINITI QX4 2005 Factory Service Manual EC-14Revision: October 2005
INDEX FOR DTC
2005 QX56
FUEL SYS-RICH-B1 P0172 0172EC-245
FUEL SYS-RICH-B2 P0175 0175EC-245
HLR/C SOL/CIRC P1767 1767AT- 1 5 2
HLR/C SOL FNCTN P1769 1769AT- 1 5 4
HO2S2 (B1

Page 1207 of 3419

INFINITI QX4 2005 Factory Service Manual EC-16Revision: October 2005
PRECAUTIONS
2005 QX56
PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
UBS00KZ0
The Supplemental Re

EC-16Revision: October 2005
PRECAUTIONS
2005 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.
WAR NIN G:
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-67, "
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 battery ground cable.
SEF 2 89 H

Page 1210 of 3419

INFINITI QX4 2005 Factory Service Manual PRECAUTIONS
EC-19
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EC
Revision: October 20052005 QX56
Do not operate fuel pump when there is no fuel in lines.
Tighten fuel hose clamps to the specified torque.
Do not depress

Page 1211 of 3419

INFINITI QX4 2005 Factory Service Manual EC-20Revision: October 2005
PREPARATION
2005 QX56
PREPARATIONPFP:00002
Special Service ToolsUBS00KZ4
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated he

Page 1213 of 3419

INFINITI QX4 2005 Factory Service Manual EC-22Revision: October 2005
PREPARATION
2005 QX56
Commercial Service ToolsUBS00KZ5
Tool name
(Kent-Moore No.)Description
Leak detector
i.e.: (J-41416)Locating the EVAP leak
EVAP service port
adapter

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