engine INFINITI FX35 2008 Service Manual

EC-2
Circuit Diagram ......................................................107
ECM Harness Connector Terminal Layout ............109
ECM Terminal and Reference Value .....................109
CONSULT-III Function (ENGINE) .........................117
Generic Scan Tool (GST) Function .......................125
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ..
127
TROUBLE DIAGNOSIS - SPECIFICATION
VALUE .............................................................
131
Description ........................................................... ..131
Testing Condition ...................................................131
Inspection Procedure .............................................131
Diagnosis Procedure .............................................131
TROUBLE DIAGNOSIS FOR INTERMITTENT
INCIDENT ........................................................
139
Description ........................................................... ..139
Diagnosis Procedure .............................................139
POWER SUPPLY AND GROUND CIRCUIT ...140
Wiring Diagram .................................................... ..140
Diagnosis Procedure .............................................141
Ground Inspection .................................................144
DTC U1000, U1001 CAN COMMUNICATION
LINE .................................................................
146
Description ........................................................... ..146
On Board Diagnosis Logic .....................................146
DTC Confirmation Procedure ................................146
Wiring Diagram ......................................................147
Diagnosis Procedure .............................................147
DTC U1010 CAN COMMUNICATION .............148
Description ........................................................... ..148
On Board Diagnosis Logic .....................................148
DTC Confirmation Procedure ................................148
Diagnosis Procedure .............................................148
DTC P0011, P0021 IVT CONTROL .................149
Description ........................................................... ..149
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ..
149
On Board Diagnosis Logic .....................................150
DTC Confirmation Procedure ................................150
Diagnosis Procedure .............................................151
Component Inspection ...........................................152
Removal and Installation .......................................152
DTC P0031, P0032, P0051, P0052 A/F SEN-
SOR 1 HEATER ...............................................
153
Description ........................................................... ..153
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ..
153
On Board Diagnosis Logic .....................................153
DTC Confirmation Procedure ................................153
Wiring Diagram ......................................................154
Diagnosis Procedure .............................................157
Component Inspection ...........................................158
Removal and Installation .......................................159
DTC P0037, P0038, P0057, P0058 HO2S2
HEATER ...........................................................
160
Description ........................................................... .160
CONSULT-III Reference Value in Data Monitor
Mode .....................................................................
160
On Board Diagnosis Logic ....................................160
DTC Confirmation Procedure ................................160
Wiring Diagram .....................................................162
Diagnosis Procedure .............................................165
Component Inspection ..........................................166
Removal and Installation .......................................167
DTC P0075, P0081 IVT CONTROL SOLE-
NOID VALVE ....................................................
168
Component Description ....................................... .168
CONSULT-III Reference Value in Data Monitor
Mode .....................................................................
168
On Board Diagnosis Logic ....................................168
DTC Confirmation Procedure ................................168
Wiring Diagram .....................................................169
Diagnosis Procedure .............................................172
Component Inspection ..........................................173
Removal and Installation .......................................174
DTC P0101 MAF SENSOR ..............................175
Component Description ....................................... .175
CONSULT-III Reference Value in Data Monitor
Mode .....................................................................
175
On Board Diagnosis Logic ....................................175
DTC Confirmation Procedure ................................175
Overall Function Check .........................................176
Wiring Diagram .....................................................177
Diagnosis Procedure .............................................178
Component Inspection ..........................................180
Removal and Installation .......................................181
DTC P0102, P0103 MAF SENSOR ..................182
Component Description ....................................... .182
CONSULT-III Reference Value in Data Monitor
Mode .....................................................................
182
On Board Diagnosis Logic ....................................182
DTC Confirmation Procedure ................................182
Wiring Diagram .....................................................184
Diagnosis Procedure .............................................185
Component Inspection ..........................................187
Removal and Installation .......................................188
DTC P0112, P0113 IAT SENSOR ....................189
Component Description ....................................... .189
On Board Diagnosis Logic ....................................189
DTC Confirmation Procedure ................................189
Wiring Diagram .....................................................190
Diagnosis Procedure .............................................190
Component Inspection ..........................................192
Removal and Installation .......................................192
DTC P0117, P0118 ECT SENSOR ...................193
Component Description ....................................... .193
On Board Diagnosis Logic ....................................193
DTC Confirmation Procedure ................................194
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EC-6
Diagnosis Procedure .............................................420
DTC P0605 ECM ..............................................422
Component Description ....................................... ..422
On Board Diagnosis Logic .....................................422
DTC Confirmation Procedure ................................422
Diagnosis Procedure .............................................423
DTC P0643 SENSOR POWER SUPPLY ........424
On Board Diagnosis Logic ................................... ..424
DTC Confirmation Procedure ................................424
Wiring Diagram ......................................................425
Diagnosis Procedure .............................................426
DTC P0850 PNP SWITCH ...............................429
Component Description ....................................... ..429
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ..
429
On Board Diagnosis Logic .....................................429
DTC Confirmation Procedure ................................429
Overall Function Check .........................................430
Wiring Diagram ......................................................431
Diagnosis Procedure .............................................432
DTC P1148, P1168 CLOSED LOOP CON-
TROL ................................................................
434
On Board Diagnosis Logic ................................... ..434
DTC P1211 TCS CONTROL UNIT ..................435
Description ........................................................... ..435
On Board Diagnosis Logic .....................................435
DTC Confirmation Procedure ................................435
Diagnosis Procedure .............................................435
DTC P1212 TCS COMMUNICATION LINE .....436
Description ........................................................... ..436
On Board Diagnosis Logic .....................................436
DTC Confirmation Procedure ................................436
Diagnosis Procedure .............................................436
DTC P1217 ENGINE OVER TEMPERATURE .437
Description ........................................................... ..437
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ..
438
On Board Diagnosis Logic .....................................438
Overall Function Check .........................................439
Wiring Diagram ......................................................440
Diagnosis Procedure .............................................441
Main 12 Causes of Overheating ............................445
Component Inspection ...........................................446
DTC P1225 TP SENSOR .................................447
Component Description ....................................... ..447
On Board Diagnosis Logic .....................................447
DTC Confirmation Procedure ................................447
Diagnosis Procedure .............................................447
Removal and Installation .......................................448
DTC P1226 TP SENSOR .................................449
Component Description ....................................... ..449
On Board Diagnosis Logic .....................................449
DTC Confirmation Procedure ............................... .449
Diagnosis Procedure .............................................449
Removal and Installation .......................................450
DTC P1421 COLD START CONTROL ............451
Description ........................................................... .451
On Board Diagnosis Logic ....................................451
DTC Confirmation Procedure ................................451
Diagnosis Procedure .............................................451
DTC P1564 ICC STEERING SWITCH ..............453
Component Description ....................................... .453
CONSULT-III Reference Value in Data Monitor
Mode .....................................................................
453
On Board Diagnosis Logic ....................................453
DTC Confirmation Procedure ................................453
Wiring Diagram .....................................................455
Diagnosis Procedure .............................................456
Component Inspection ..........................................458
DTC P1564 ASCD STEERING SWITCH ..........459
Component Description ....................................... .459
CONSULT-III Reference Value in Data Monitor
Mode .....................................................................
459
On Board Diagnosis Logic ....................................459
DTC Confirmation Procedure ................................459
Wiring Diagram .....................................................460
Diagnosis Procedure .............................................461
Component Inspection ..........................................463
DTC P1568 ICC FUNCTION .............................464
On Board Diagnosis Logic ................................... .464
DTC Confirmation Procedure ................................464
Diagnosis Procedure .............................................464
DTC P1572 ICC BRAKE SWITCH ...................465
Component Description ....................................... .465
CONSULT-III Reference Value in Data Monitor
Mode .....................................................................
465
On Board Diagnosis Logic ....................................465
DTC Confirmation Procedure ................................465
Wiring Diagram .....................................................467
Diagnosis Procedure .............................................468
Component Inspection ..........................................472
DTC P1572 ASCD BRAKE SWITCH ...............474
Component Description ....................................... .474
CONSULT-III Reference Value in Data Monitor
Mode .....................................................................
474
On Board Diagnosis Logic ....................................474
DTC Confirmation Procedure ................................474
Wiring Diagram .....................................................476
Diagnosis Procedure .............................................477
Component Inspection ..........................................480
DTC P1574 ICC VEHICLE SPEED SENSOR ..481
Component Description ........................................481
On Board Diagnosis Logic ....................................481
DTC Confirmation Procedure ................................481
Diagnosis Procedure .............................................481
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EC-8
Component Inspection ...........................................545
ASCD INDICATOR ..........................................547
Component Description ....................................... ..547
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ..
547
Wiring Diagram ......................................................548
Diagnosis Procedure .............................................548
ELECTRICAL LOAD SIGNAL .........................550
Description ........................................................... ..550
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ..
550
Diagnosis Procedure .............................................550
FUEL INJECTOR .............................................552
Component Description ....................................... ..552
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ..
552
Wiring Diagram ......................................................553
Diagnosis Procedure .............................................554
Component Inspection ...........................................557
Removal and Installation .......................................557
FUEL PUMP .....................................................558
Description ........................................................... ..558
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ..
558
Wiring Diagram ......................................................559
Diagnosis Procedure .............................................560
Component Inspection ...........................................562
Removal and Installation .......................................562
ICC BRAKE SWITCH ......................................563
Component Description ....................................... ..563
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ..
563
Wiring Diagram ......................................................564
Diagnosis Procedure .............................................565
Component Inspection ...........................................567
IGNITION SIGNAL ...........................................569
Component Description ....................................... ..569
Wiring Diagram ......................................................570
Diagnosis Procedure .............................................575
Component Inspection ...........................................578
Removal and Installation .......................................580
REFRIGERANT PRESSURE SENSOR ..........581
Component Description ....................................... ..581
Wiring Diagram ......................................................582
Diagnosis Procedure .............................................583
Removal and Installation .......................................585
SNOW MODE SWITCH ...................................586
Description ........................................................... ..586
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ..
586
Wiring Diagram ......................................................587
Diagnosis Procedure .............................................587
Component Inspection ...........................................589
MIL AND DATA LINK CONNECTOR ...............591
Wiring Diagram .................................................... .591
SERVICE DATA AND SPECIFICATIONS
(SDS) ................................................................
593
Fuel Pressure ....................................................... .593
Idle Speed and Ignition Timing .............................593
Calculated Load Value ..........................................593
Mass Air Flow Sensor ...........................................593
Intake Air Temperature Sensor .............................593
Engine Coolant Temperature Sensor ...................593
Air Fuel Ratio (A/F) Sensor 1 Heater ....................593
Heated Oxygen sensor 2 Heater ..........................593
Crankshaft Position Sensor (POS) .......................594
Camshaft Position Sensor (PHASE) .....................594
Throttle Control Motor .......................................... .594
Fuel Injector ..........................................................594
Fuel Pump .............................................................594
VK45DE
SERVICE INFORMATION .. .......................
595
INDEX FOR DTC ............................................ ..595
DTC No. Index ..................................................... .595
Alphabetical Index .................................................598
PRECAUTIONS .............................................. ..603
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................. .
603
Precaution for Procedure without Cowl Top Cover .603
On Board Diagnosis (OBD) System of Engine and
A/T ........................................................................
603
Precaution .............................................................604
PREPARATION ................................................607
Special Service Tool ............................................ .607
Commercial Service Tool ......................................608
ENGINE CONTROL SYSTEM ..........................609
Schematic ............................................................ .609
Multiport Fuel Injection (MFI) System ...................609
Electronic Ignition (EI) System ..............................612
Fuel Cut Control (at No Load and High Engine
Speed) ..................................................................
612
AIR CONDITIONING CUT CONTROL .............614
Input/Output Signal Chart .................................... .614
System Description ...............................................614
AUTOMATIC SPEED CONTROL DEVICE
(ASCD) ..............................................................
615
System Description .............................................. .615
Component Description ........................................616
CAN COMMUNICATION ..................................617
System Description .............................................. .617
EVAPORATIVE EMISSION SYSTEM ..............618
Description ........................................................... .618
Component Inspection ..........................................620
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EC-9
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Removal and Installation .....................................
..
622
How to Detect Fuel Vapor Leakage ......................622
ON BOARD REFUELING VAPOR RECOV-
ERY (ORVR) .....................................................
624
System Description ............................................. ..624
Diagnosis Procedure .............................................624
Component Inspection ..........................................626
POSITIVE CRANKCASE VENTILATION ........629
Description .......................................................... ..629
Component Inspection ..........................................629
IVIS (INFINITI VEHICLE IMMOBILIZER SYS-
TEM-NATS) ......................................................
631
Description .......................................................... ..631
ON BOARD DIAGNOSTIC (OBD) SYSTEM ....632
Introduction ......................................................... ..632
Two Trip Detection Logic ......................................632
Emission-related Diagnostic Information ...............633
Malfunction Indicator Lamp (MIL) ..........................649
OBD System Operation Chart ...............................652
BASIC SERVICE PROCEDURE ......................658
Basic Inspection .................................................. ..658
Idle Speed and Ignition Timing Check ..................661
Procedure After Replacing ECM ...........................662
VIN Registration ....................................................662
Accelerator Pedal Released Position Learning .....662
Throttle Valve Closed Position Learning ...............663
Idle Air Volume Learning .......................................663
Fuel Pressure Check .............................................665
TROUBLE DIAGNOSIS ...................................666
Trouble Diagnosis Introduction ........................... ..666
DTC Inspection Priority Chart ...............................670
Fail-Safe Chart ......................................................671
Symptom Matrix Chart ..........................................673
Engine Control Component Parts Location ...........677
Vacuum Hose Drawing .........................................684
Circuit Diagram .....................................................685
ECM Harness Connector Terminal Layout ...........687
ECM Terminal and Reference Value ....................687
CONSULT-III Function (ENGINE) .........................695
Generic Scan Tool (GST) Function .......................704
CONSULT-III Reference Value in Data Monitor
Mode ................................................................... ..
705
TROUBLE DIAGNOSIS - SPECIFICATION
VALUE ..............................................................
709
Description .......................................................... ..709
Testing Condition ..................................................709
Inspection Procedure ............................................709
Diagnosis Procedure .............................................710
TROUBLE DIAGNOSIS FOR INTERMITTENT
INCIDENT .........................................................
717
Description .......................................................... ..717
Diagnosis Procedure .............................................717
POWER SUPPLY AND GROUND CIRCUIT ..718
Wiring Diagram .................................................... ..718
Diagnosis Procedure .............................................719
Ground Inspection .................................................723
DTC U1000, U1001 CAN COMMUNICATION
LINE .................................................................
724
Description .............................................................724
On Board Diagnosis Logic .....................................724
DTC Confirmation Procedure ................................724
Wiring Diagram ......................................................725
Diagnosis Procedure .............................................725
DTC U1010 CAN COMMUNICATION .............726
Description .............................................................726
On Board Diagnosis Logic .....................................726
DTC Confirmation Procedure ................................726
Diagnosis Procedure .............................................726
DTC P0011, P0021 IVT CONTROL ................727
Description .............................................................727
CONSULT-III Reference Value in Data Monitor
Mode ......................................................................
728
On Board Diagnosis Logic .....................................728
DTC Confirmation Procedure ................................728
Wiring Diagram ......................................................730
Diagnosis Procedure .............................................733
Component Inspection ...........................................737
Removal and Installation .......................................738
DTC P0031, P0032, P0051, P0052 A/F SEN-
SOR 1 HEATER ..............................................
739
Description .............................................................739
CONSULT-III Reference Value in Data Monitor
Mode ......................................................................
739
On Board Diagnosis Logic .....................................739
DTC Confirmation Procedure ................................739
Wiring Diagram ......................................................740
Diagnosis Procedure .............................................743
Component Inspection ...........................................744
Removal and Installation .......................................745
DTC P0037, P0038, P0057, P0058 HO2S2
HEATER ..........................................................
746
Description .............................................................746
CONSULT-III Reference Value in Data Monitor
Mode ......................................................................
746
On Board Diagnosis Logic .....................................746
DTC Confirmation Procedure ................................746
Wiring Diagram ......................................................748
Diagnosis Procedure .............................................751
Component Inspection ...........................................752
Removal and Installation .......................................753
DTC P0075, P0081 IVT CONTROL SOLE-
NOID VALVE ...................................................
754
Component Description .........................................754
CONSULT-III Reference Value in Data Monitor
Mode ......................................................................
754
On Board Diagnosis Logic .....................................754
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EC-13
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DTC P0462, P0463 FUEL LEVEL SENSOR .. ..990
Component Description ....................................... ..990
On Board Diagnosis Logic ....................................990
DTC Confirmation Procedure ................................990
Diagnosis Procedure .............................................990
Removal and Installation .......................................991
DTC P0500 VSS ...............................................992
Description .......................................................... ..992
On Board Diagnosis Logic ....................................992
DTC Confirmation Procedure ................................992
Overall Function Check .........................................993
Diagnosis Procedure .............................................993
DTC P0506 ISC SYSTEM ................................994
Description .......................................................... ..994
On Board Diagnosis Logic ....................................994
DTC Confirmation Procedure ................................994
Diagnosis Procedure .............................................994
DTC P0507 ISC SYSTEM ................................996
Description .......................................................... ..996
On Board Diagnosis Logic ....................................996
DTC Confirmation Procedure ................................996
Diagnosis Procedure .............................................996
DTC P0550 PSP SENSOR ............................. ..998
Component Description ....................................... ..998
CONSULT-III Reference Value in Data Monitor
Mode ................................................................... ..
998
On Board Diagnosis Logic ....................................998
DTC Confirmation Procedure ................................998
Wiring Diagram .....................................................999
Diagnosis Procedure ...........................................1000
Component Inspection ........................................1002
Removal and Installation .....................................1002
DTC P0603 ECM POWER SUPPLY ..............1003
Component Description .......................................1003
On Board Diagnosis Logic ..................................1003
DTC Confirmation Procedure ..............................1003
Wiring Diagram ...................................................1004
Diagnosis Procedure ...........................................1005
DTC P0605 ECM ............................................1007
Component Description .......................................1007
On Board Diagnosis Logic ..................................1007
DTC Confirmation Procedure ..............................1007
Diagnosis Procedure ...........................................1008
DTC P0643 SENSOR POWER SUPPLY .......1009
On Board Diagnosis Logic ..................................1009
DTC Confirmation Procedure ..............................1009
Wiring Diagram ...................................................1010
Diagnosis Procedure ...........................................1011
DTC P0850 PNP SWITCH ..............................1014
Component Description .......................................1014
CONSULT-III Reference Value in Data Monitor
Mode ...................................................................
1014
On Board Diagnosis Logic ..................................1014
DTC Confirmation Procedure ..............................1014
Overall Function Check .......................................1015
Wiring Diagram ....................................................1016
Diagnosis Procedure ...........................................1017
DTC P1140, P1145 IVT CONTROL POSITION
SENSOR .........................................................
1019
Component Description .......................................1019
CONSULT-III Reference Value in Data Monitor
Mode ....................................................................
1019
On Board Diagnosis Logic ...................................1019
DTC Confirmation Procedure ..............................1019
Wiring Diagram ....................................................1020
Diagnosis Procedure ...........................................1023
Component Inspection .........................................1025
Removal and Installation .....................................1026
DTC P1148, P1168 CLOSED LOOP CON-
TROL ..............................................................
1027
On Board Diagnosis Logic ...................................1027
DTC P1211 TCS CONTROL UNIT .................1028
Description ...........................................................1028
On Board Diagnosis Logic ...................................1028
DTC Confirmation Procedure ..............................1028
Diagnosis Procedure ...........................................1028
DTC P1212 TCS COMMUNICATION LINE ...1029
Description ...........................................................1029
On Board Diagnosis Logic ...................................1029
DTC Confirmation Procedure ..............................1029
Diagnosis Procedure ...........................................1029
DTC P1217 ENGINE OVER TEMPERATURE 1030
Description ...........................................................1030
CONSULT-III Reference Value in Data Monitor
Mode ....................................................................
1031
On Board Diagnosis Logic ...................................1031
Overall Function Check .......................................1032
Wiring Diagram ....................................................1034
Diagnosis Procedure ...........................................1035
Main 13 Causes of Overheating ..........................1039
Component Inspection .........................................1040
DTC P1225 TP SENSOR ...............................1041
Component Description .......................................1041
On Board Diagnosis Logic ...................................1041
DTC Confirmation Procedure ..............................1041
Diagnosis Procedure ...........................................1041
Removal and Installation .....................................1042
DTC P1226 TP SENSOR ...............................1043
Component Description .......................................1043
On Board Diagnosis Logic ...................................1043
DTC Confirmation Procedure ..............................1043
Diagnosis Procedure ...........................................1043
Removal and Installation .....................................1044
DTC P1421 COLD START CONTROL ..........1045
Description ...........................................................1045
On Board Diagnosis Logic ...................................1045
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EC-16
Description ...........................................................1182
CONSULT-III Reference Value in Data Monitor
Mode ....................................................................
1182
Wiring Diagram ....................................................1183
Diagnosis Procedure ...........................................1183
Component Inspection .........................................1185
VARIABLE INDUCTION AIR CONTROL SYS-
TEM (VIAS) .....................................................
1187
Description ...........................................................1187
CONSULT-III Reference Va lue in Data Monitor
Mode ....................................................................
1188
Wiring Diagram ....................................................1189
Diagnosis Procedure ...........................................1190
Component Inspection .........................................1193
Removal and Installation .....................................1193
MIL AND DATA LINK CONNECTOR .............1194
Wiring Diagram ....................................................1194
SERVICE DATA AND SPECIFICATIONS
(SDS) ..............................................................
1196
Fuel Pressure .......................................................1196
Idle Speed and Ignition Timing ............................1196
Calculated Load Value .........................................1196
Mass Air Flow Sensor ..........................................1196
Intake Air Temperature Sensor ............................1196
Engine Coolant Temperature Sensor ..................1196
Fuel Tank Temperature Sensor ...........................1196
Crankshaft Position Sensor (POS) ......................1197
Camshaft Position Sensor (PHASE) ....................1197
A/F Sensor 1 Heater ............................................1197
Heated Oxygen sensor 2 Heater .........................1197
Throttle Control Motor ..........................................1197
Fuel Injector .........................................................1197
Fuel Pump ............................................................1197
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PRECAUTIONSEC-25
< SERVICE INFORMATION > [VQ35DE]
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PRECAUTIONS
Precaution for Supplemental
Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000001612915
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty 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 “SUPPLEMENTAL RESTRAINT SYS-
TEM” and “SEAT BELTS” of this Service Manual.
WARNING:
 To avoid rendering the SRS inoper ative, 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 performed by
an authorized NISSAN/INFINITI dealer.
 Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintentional act ivation of the system. For removal of Spiral Cable and Air Bag
Module, see the “SUPPLEMEN TAL RESTRAINT SYSTEM”.
 Do not use electrical test equipm ent on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
Precaution for Procedur e without Cowl Top CoverINFOID:0000000001612935
When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.
On Board Diagnosis (OBD) System of Engine and A/TINFOID:0000000001325891
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 di sconnect the negative battery cable before any repair
or inspection work. The op en/short circuit of related switches, sensors, solenoid valves, etc. will
cause the MIL to light up.
 Be sure to connect and lock the connectors secure ly 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-lock-
ing type harness connector. For descripti on and how to disconnect, refer to PG-68
.
 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 li ght up due to the short circuit.
 Be sure to connect rubber tubes properly afte r work. A misconnected or disconnected rubber tube
may cause the MIL to light up due to the malfuncti on of the EVAP system or fuel injection system,
etc.
 Be sure to erase the unnecessary ma lfunction information (repairs completed) from the ECM and
TCM (Transmission control module) before returning the vehicle to the customer.
PIIB3706J
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

EC-26
< SERVICE INFORMATION >[VQ35DE]
PRECAUTIONS
Precaution
INFOID:0000000001325892
 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 bat-
tery 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 ig nition switch OFF and then dis-
connect negative battery cable.
 Do not disassemble ECM.
 If a battery cable is disconnected, the memory will return to
the ECM value.
The ECM will now start to self-c ontrol at its initial value.
Engine operation can vary slight ly when the terminal is dis-
connected. However, this is no t an indication of a malfunc-
tion. Do not replace parts b ecause of a slight variation.
 If the battery is disconnected, the following emission-related
diagnostic information will be lost within 24 hours.
- Diagnostic trouble codes
- 1st trip diagnostic trouble codes
- Freeze frame data
- 1st trip freeze frame data
- System readiness test (SRT) codes
- Test values
 When connecting ECM harness co nnector, fasten it securely
with a lever as far as it will go as shown in the figure.
 When connecting or disconnect ing pin connectors into or
from ECM, take care not to damage pin terminals (bend or
break).
Make sure that there are not any bends or breaks on ECM pin
terminal, when connecting pin connectors.
 Securely connect ECM harness connectors.
A poor connection can cause an extremely high (surge) volt-
age to develop in coil and co ndenser, thus resulting in dam-
age to ICs.
 Keep engine control system harn ess at least 10 cm (4 in) away
from adjacent harness, to preven t engine control system mal-
functions due to receiving exter nal noise, degraded operation
of ICs, etc.
 Keep engine control system parts and harness dry.
SEF289H
PBIB1164E
PBIB1512E
PBIB0090E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

EC-28
< SERVICE INFORMATION >[VQ35DE]
PRECAUTIONS

B1 indicates the bank 1, B2 indicates the bank 2 as shown in
the figure.
 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 unnecessar-
ily.
 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 m ay adversely affect electronic
control systems depending on installation location.
- Keep the antenna as far as possi ble from the electronic con-
trol 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.
SEC893C
PBIB1569E
SEF709Y
SEF708Y
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

PREPARATIONEC-29
< SERVICE INFORMATION > [VQ35DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
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PREPARATION
Special Service ToolINFOID:0000000001325893
The actual shapes of Kent-Moore t
ools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool name Description
KV10117100
(J-36471-A)
Heated oxygen sensor
wrench Loosening or tightening heated oxygen sensor
with 22 mm (0.87 in) hexagon nut
KV10114400
(J-38365)
Heated oxygen sensor
wrench Loosening or tightening air fuel ratio (A/F) sensor
a: 22 mm (0.87 in)
(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-44626)
Air fuel ratio (A/F)
sensor wrench Loosening or tightening air fuel ratio (A/F) sensor 1
(J-45488)
Quick connector re-
lease Remove fuel tube quick connectors in engine
room.
S-NT379
S-NT636
LEC642
LBIA0376E
LEM054
PBIC0198E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C