service repair manual instant download

1. -1
QUICK REFERENCE INDEX
A GENERAL INFORMATION GI General Information
B ENGINE EM Engine Mechanical
LU Engine Lubrication System
CO Engine Cooling System
EC Engine Control System
FL Fuel System
EX Exhaust System
ACC Accelerator Control System
C TRANSMISSION/
TRANSAXLE
CL Clutch
MT Manual Transaxle
CVT CVT
D DRIVELINE/AXLE FAX Front Axle
RAX Rear Axle
E SUSPENSION FSU Front Suspension
RSU Rear Suspension
WT Road Wheels & Tires
F BRAKES BR Brake System
PB Parking Brake System
BRC Brake Control System
G STEERING PS Power Steering System
STC Steering Control System
H RESTRAINTS SB Seat Belts
SRS Supplemental Restraint System (SRS)
I BODY BL Body, Lock & Security System
GW Glasses, Window System & Mirrors
RF Roof
EI Exterior & Interior
IP Instrument Panel
SE Seat
J AIR CONDITIONER MTC Manual Air Conditioner
K ELECTRICAL SC Starting & Charging System
LT Lighting System
DI Driver Information System
WW Wiper, Washer & Horn
BCS Body Control System
LAN LAN System
AV Audio Visual, Navigation & Telephone System
ACS Auto Cruise Control System
PG Power Supply, Ground & Circuit Elements
L MAINTENANCE MA Maintenance
Edition: July 2010
Revision: July 2010
Publication No. SM1E-1B16U0
B
D
© 2010 NISSAN NORTH AMERICA, INC.
All rights reserved. No part of this Service Manual may be reproduced or stored in a retrieval system, or transmitted in any
form, or by any means, electronic, mechanical, photo-copying, recording or otherwise, without the prior written permission
of Nissan North America, Inc.
A
C
E
F
G
H
I
J
K
L
M

2. -2
This manual contains maintenance and repair procedures for the
2011 NISSAN SENTRA.
In order to assure your safety and the efficient functioning of the vehicle,
this manual should be read thoroughly. It is especially important that the
PRECAUTIONS in the GI section be completely understood before starting
any repair task.
All information in this manual is based on the latest product information
at the time of publication. The right is reserved to make changes in specifi-
cations and methods at any time without notice.
IMPORTANT SAFETY NOTICE
The proper performance of service is essential for both the safety of
the technician and the efficient functioning of the vehicle.
The service methods in this Service Manual are described in such a
manner that the service may be performed safely and accurately.
Service varies with the procedures used, the skills of the technician
and the tools and parts available. Accordingly, anyone using service
procedures, tools or parts which are not specifically recommended
by NISSAN must first be completely satisfied that neither personal
safety nor the vehicle’s safety will be jeopardized by the service
method selected.

3. 2011
QUICK REFERENCE INDEX: SENTRA
QUICK REFERENCE INDEX: SENTRA
Engine Tune-up Data: MR20DE INFOID:0000000006708607
GENERAL SPECIFICATIONS
DRIVE BELT
SPARK PLUG
Unit: mm (in)
*: Always check with the Parts Department for the latest parts information
Engine Tune-up Data: QR25DE INFOID:0000000006708606
GENERAL SPECIFICATIONS
Engine type MR20DE
Cylinder arrangement In-line 4
Displacement cm3
(cu in) 1,997 (121.86)
Bore and stroke mm (in) 84.0 x 90.1 (3.307 x 3.547)
Valve arrangement DOHC
Firing order 1-3-4-2
Number of piston rings
Compression 2
Oil 1
Compression ratio 10.2
Compression pressure
kPa (bar, kg/cm2
, psi) / 250 rpm
Standard 1,390 (13.9, 14.2, 202)
Minimum 1,140 (11.4. 11.6, 165)
Differential limit between cylinders 100 (1.0, 1.0, 15)
Tension of drive belt Auto adjustment by auto-tensioner
Application Except for California For California
Make NGK Denso
Standard type* PLZKAR6A-11 FXE20HR-11
Spark plug gap Nominal: 1.1 (0.043)
Model SE-R SE-R Spec V
Cylinder arrangement In-line 4
Displacement cm3
(in3
) 2,488 (151.82)
Bore and stroke mm (in) 89.0 x 100 (3.50 x 3.94)
Valve arrangement DOHC
Firing order 1-3-4-2
Number of piston rings
Compression 2
Oil 1
Compression ratio 9.5:1 10.5:1

4. QUICK REFERENCE INDEX: SENTRA
2011
DRIVE BELTS
SPARK PLUG
Unit: mm (in)
*: Always check with the Parts Department for the latest parts information
Front Wheel Alignment (Unladen*) INFOID:0000000006708605
Compression pressure
kPa (kg/cm2, psi) / 250 rpm
Standard 1,250 (12.8, 181.3)
Minimum 1,060 (10.8, 153.7)
Differential limit be-
tween cylinders
100 (1.0, 14)
Valve timing
Unit: degree
a b c d e f
224° 244° 0° 64° 3° 41°
PBIC0187E
Tension of drive belts Auto adjustment by auto tensioner
Make NGK
Type* Standard DILKAR6A-11
Gap (nominal) 1.1 (0.043)
Engine
MR20DE
QR25DE
QR25DE
Model
2.0, 2.0 S, 2.0 SR, 2.0 SL
SE-R
SE-R SPEC-V
Camber
Degree minute
(Decimal degree)
LH
Minimum -0° 37′ (-0.62°) -0° 42′ (-0.70°)
Nominal -0° 10′ (-0.17°) -0° 15′ (-0.25°)
Maximum 0° 29′ (0.48°) 0° 24′ (0.40°)
RH
Minimum -0° 49′ (-0.82°) -0° 54′ (-0.90°)
Nominal -0° 10′ (-0.17°) -0° 15′ (-0.25°)
Maximum 0° 17′ (0.28°) 0° 12′ (0.20°)
LH - RH
Minimum -0° 22′ (-0.37°) -0° 22′ (-0.37°)
Nominal 0° 0′ (0.0°) 0° 0′ (0.0°)
Maximum 0° 46′ (0.77°) 0° 46′ (0.77°)

5. 2011
QUICK REFERENCE INDEX: SENTRA
*: Fuel, engine coolant and engine oil full. Spare tire, jack, hand tools and mats in designated positions.
Rear Wheel Alignment (Unladen*) INFOID:0000000006708603
Caster
Degree minute
(Decimal degree)
LH
Minimum 4° 15′ (4.25°) 4° 30′ (4.50°)
Nominal 4° 48′ (4.80°) 5° 3′ (5.05°)
Maximum 5° 21′ (5.35°) 5° 36′ (5.60°)
RH
Minimum 4° 29′ (4.48°) 4° 44′ (4.73°)
Nominal 5° 02′ (5.03°) 5° 17′ (5.28°)
Maximum 5° 35′ (5.58°) 5° 50′ (5.83°)
LH - RH
Minimum -0° 48′ (-0.80°) -0°48′(-0.80°)
Nominal -0° 14′ (-0.23°) -0° 14′ (-0.23°)
Maximum 0° 20′ (0.33°) 0° 20′ (0.33°)
Kingpin inclination
Degree minute (Decimal degree)
LH 10° 58′ (10.97°) 11° 13′ (11.22°)
RH 11° 12′ (11.20°) 11° 27′ (11.45°)
Toe-in
Distance (A - B)
Minimum -1.0 mm (-0.04 in) -1 mm (-0.04 in)
Nominal 0.0 mm (0.00 in) 0 mm (0.00 in)
Maximum 1.0 mm (0.04 in) 1 mm (0.04 in)
Angle (left or right, each
side)
Degree minute (Degree)
Minimum -0° 2′ 42" (-0.05°) -0° 2′ 42" (-0.05°)
Nominal 0° 0′ 0" (0.00°) 0° 00′ (0.00°)
Maximum 0° 2’ 42" (0.05°) 0° 2′ 42" (0.05°)
SFA234AC
Model 2.0, 2.0 S, 2.0 SR, 2.0 SL SE-R SE-R SPEC-V
Camber
Degree
minute (Deci-
mal degree)
Minimum – 2° 00′ (– 2.00°) – 2° 00′ (– 2.00°) – 2° 00′ (– 2.00°)
Nominal – 1° 30′ (– 1.50°) – 1° 30′ (– 1.50°) – 1° 30′ (– 1.50°)
Maximum – 1° 00′ (– 1.00°) – 1° 00′ (– 1.00°) – 1° 00′ (– 1.00°)
SEIA0363E

6. QUICK REFERENCE INDEX: SENTRA
2011
*: Fuel, engine coolant and engine oil full. Spare tire, jack, hand tools and mats in designated positions.
Wheelarch Height (Unladen*) INFOID:0000000006708604
*: Fuel, radiator coolant and engine oil full. Spare tire, jack, hand tools and mats in designated positions.
Brake Specifications INFOID:0000000006708601
Unit: mm (in)
Toe-in
Distance (A - B)
Minimum – 3.0 mm ( – 0.118 in) – 2.0 mm ( – 0.079 in) – 1.0 mm (– 0.039 in)
Nominal 1.0 mm (0.039 in) 2.0 mm (0.079 in) 3.0 mm (0.118 in)
Maximum 5.0 mm (0.197 in) 6.0 mm (0.236 in) 7.0 mm (0.276 in)
Angle left side
or right side
Degree minute
(Decimal de-
gree)
Minimum – 0° 8′ 30" (– 0.14°) – 0° 5′ 30" (– 0.09°) – 0° 3′ 0" (– 0.05°)
Nominal 0° 3′ 0" (0.05°) 0° 5′ 30" (0.09°) 0° 8′ 30" (0.14°)
Maximum 0° 14′ 0" (0.23°) 0° 17′ 0" (0.28°) 0° 19′ 0" (0.32°)
Engine MR20DE QR25DE
Tire Size P205/60HR15 P205/55HR16 P225/45VR17 P225/45WR17
Front (Hf) mm (in) 689 (27.13) 692 (27.24) 690 (27.17) 679 (26.73)
Rear (Hr) mm (in) 688 (27.09) 692 (27.24) 690 (27.17) 677 (26.65)
LEIA0085E
Applied model
MR20DE QR25DE
Base, S, SR, SL SE-R SE-R SPEC-V
Front disc brake Brake model CLZ25VB CLZ25VJ AD25V
Cylinder bore diameter 57.2 (2.252) 57.2 (2.252) 57.15 (2.250)
Pad thickness 11 (0.433) 11 (0.433) 11 (0.433)
Rotor outer diameter ×
thickness
280 × 24.0 (11.02 × 0.945) 296 × 26.0 (11.65 × 1.024) 320 × 28.0 (12.60 × 1.102)
Rear disc brake Brake model — AD9A/DS17
Cylinder bore diameter — 34.93 (1.375)
Pad thickness — 8.5 (0.335)
Rotor outer diameter ×
thickness
— 292 × 9.0 (11.50 × 0.354)
Rear drum brake Brake model LT23E — —
Cylinder bore diameter 19.05 (0.750) — —
Lining
Length × width × thickness
194.1 × 35 × 2.9
(7.642 × 1.378 × 0.114)
— —
Drum inner diameter 228.6 (9.000) — —
Master cylinder Cylinder bore diameter 23.81 (0.937)

7. 2011
QUICK REFERENCE INDEX: SENTRA
Brake Pedal INFOID:0000000006708602
Unit: mm (in)
Front Disc Brake INFOID:0000000006708598
CLZ25VB
Unit: mm (in)
CLZ25VJ
Unit: mm (in)
Brake booster Booster model C255
Diaphragm diameter 255 (10.04)
Recommended brake fluid DOT 3
Brake pedal height (H)
(from dash lower panel top surface)
164.0 - 174.0 (6.46 - 6.85)
Brake pedal full stroke (S) 135.1 (5.32)
Clearance between pedal stopper bracket and threaded end of the stop
lamp switch (C1) and ASCD cancel switch (C2), if equipped.
0.74 - 1.96 (0.0291 - 0.0772)
AWFIA0557ZZ
Brake pad
Standard thickness (new) 11 (0.433)
Repair limit thickness 2.0 (0.079)
Disc rotor
Standard thickness (new) 24.0 (0.945)
Repair limit thickness 22.0 (0.866)
Runout limit 0.035 (0.0014)
Maximum uneven wear (mea-
sured at 8 positions)
0.02 (0.0008) or less
Brake pad
Standard thickness (new) 11 (0.433)
Repair limit thickness 2.0 (0.079)

8. QUICK REFERENCE INDEX: SENTRA
2011
AD25V
Unit: mm (in)
Rear Disc Brake INFOID:0000000006708599
AD9A/DS17
Unit: mm (in)
Rear Drum Brake INFOID:0000000006708600
LT23E
Unit: mm (in)
Fluids and Lubricants: MR20DE INFOID:0000000006708596
Disc rotor
Standard thickness (new) 26.0 (1.024)
Repair limit thickness 24.0 (0.945)
Runout limit 0.035 (0.0014)
Maximum uneven wear (mea-
sured at 8 positions)
0.02 (0.0008) or less
Brake pad
Standard thickness (new) 11 (0.433)
Repair limit thickness 2.0 (0.079)
Disc rotor
Standard thickness (new) 28.0 (1.102)
Repair limit thickness 26.0 (1.024)
Runout limit 0.035 (0.0014)
Maximum uneven wear (mea-
sured at 8 positions)
0.02 (0.0008) or less
Brake pad
Standard thickness (new) 8.5 (0.335)
Repair limit thickness 2.0 (0.079)
Disc rotor
Standard thickness (new) 9.0 (0.354)
Repair limit thickness 8.0 (0.315)
Runout limit 0.07 (0.0028)
Maximum uneven wear (mea-
sured at 8 positions)
0.015 (0.0006) or less
Brake lining
Standard thickness (new) 2.9 (0.114)
Repair limit thickness 1.5 (0.059)
Drum
Standard inner diameter (new) 228.6 (9.000)
Repair limit inner diameter 230.0 (9.055)
Description
Capacity (Approximate)
Liter US measure Imp measure
Fuel 55.0 14 1/2 gal 12 1/8 gal
Engine oil
Drain and refill
With oil filter change 3.9 4 1/8 qt 3 3/8 qt
Without oil filter change 3.6 3 7/8 qt 3 1/8 qt
Dry engine (engine overhaul) 4.4 4 5/8 qt 3 7/8 qt
Cooling system
(with reservoir at MAX level)
7.0 7 3/8 qt 6 1/8 qt
Manual transaxle fluid (MTF) 2.0 4 1/4 pt 3 1/2 pt
CVT fluid 7.3 7 3/4 qt 6 3/8 qt
Brake and clutch fluid — — —
Multi-purpose grease — — —

9. 2011
QUICK REFERENCE INDEX: SENTRA
Fluids and Lubricants: QR25DE INFOID:0000000006708597
Windshield washer fluid 3.5 3 3/4 qt 3 1/8 qt
Air conditioning system refrigerant 0.50 ± 0.025 kg 1.10 ± 0.055 lb 1.10 ± 0.055 lb
Air conditioning system oil
150 m 5.03 fl oz 5.3 fl oz
Description
Capacity (Approximate)
Liter US measure Imp measure
Fuel 55.0 14 1/2 gal 12 1/8 gal
Description
Capacity (Approximate)
Liter US measure Imp measure
Fuel 55.0 14 1/2 gal 12 1/8 gal
Engine oil
Drain and refill
With oil filter change 4.3 4 1/2 qt 3 3/4 qt
Without oil filter change 4.0 4 1/4 qt 3 1/2 qt
Dry engine (engine overhaul) 5.1 5 3/8 qt 4 1/2 qt
Cooling system
(with reservoir at MAX level)
M/T models 6.9 7 1/4 qt 6 1/8 qt
CVT models 7.1 7 1/2 qt 6 1/4 qt
Manual transaxle fluid (MTF) 1.7 3 5/8 pt 3 pt
CVT fluid 7.5 7 7/8 qt 6 5/8 qt
Brake and clutch fluids — — —
Multi-purpose grease — — —
Windshield washer fluid 3.5 3 3/4 qt 3 1/8 qt
Air conditioning system refrigerant 0.50 ± 0.025 kg 1.10 ± 0.055 lb 1.10 ± 0.055 lb
Air conditioning system oil
150 m 5.03 fl oz 5.3 fl oz

10. GI-1
GENERAL INFORMATION
C
D
E
F
G
H
I
J
K
L
M
B
GI
SECTION GI
N
O
P
CONTENTS
GENERAL INFORMATION
SERVICE INFORMATION ........................
.... 2
PRECAUTIONS ..............................................
..... 2
Description ..........................................................
......2
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................
......2
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ...............................
......2
General Precaution .............................................
......3
Precaution for Three Way Catalyst .....................
......4
Precaution for Fuel (Unleaded Regular Gasoline
Recommended) MR20DE and QR25DE Except
SE-R Spec-V .......................................................
......4
Precaution for Fuel (Unleaded Premium Gasoline
Required) QR25DE SE-R Spec-V Only ..............
......5
Precaution for Multiport Fuel Injection System or
Engine Control System .......................................
......5
Precaution for Hoses ...........................................
......5
Precaution for Engine Oils ..................................
......6
Precaution for Air Conditioning ...........................
......7
HOW TO USE THIS MANUAL .......................
..... 8
Description ..........................................................
......8
Terms ..................................................................
......8
Units ....................................................................
......8
Contents ..............................................................
......8
Relation between Illustrations and Descriptions .
......9
Component ..........................................................
......9
How to Follow Trouble Diagnosis ........................
....10
How to Read Wiring Diagram ..............................
....14
Abbreviations ......................................................
....21
SERVICE INFORMATION FOR ELECTRICAL
INCIDENT .......................................................
....23
How to Check Terminal .......................................
....23
How to Perform Efficient Diagnosis for an Electri-
cal Incident ..........................................................
....26
Control Units and Electrical Parts ........................
....33
CONSULT-III CHECKING SYSTEM .................36
Description ...........................................................
....36
Function and System Application ........................
....36
CONSULT-III Data Link Connector (DLC) Circuit....37
LIFTING POINT .................................................39
Special Service Tool ............................................
....39
Garage Jack and Safety Stand and 2-Pole Lift ...
....39
Board-On Lift .......................................................
....40
TOW TRUCK TOWING .....................................41
Tow Truck Towing ...............................................
....41
Vehicle Recovery (Freeing a Stuck Vehicle) .......
....41
TIGHTENING TORQUE OF STANDARD
BOLTS ...............................................................43
Tightening Torque Table .....................................
....43
RECOMMENDED CHEMICAL PRODUCTS
AND SEALANTS ...............................................44
Recommended Chemical Product and Sealant ...
....44
IDENTIFICATION INFORMATION ....................45
Model Variation ....................................................
....45
Dimensions ..........................................................
....48
Wheels & Tires ....................................................
....48
TERMINOLOGY ................................................49
SAE J1930 Terminology List ...............................
....49
Revision: July 2010 2011 Sentra

11. Thank you very much
for your reading. Please
Click Here Then Get
More Information.
NOTE:
If there is no response to
click on the link above,
please download the PDF
document first and then
click on it.

12. GI-2
< SERVICE INFORMATION >
PRECAUTIONS
SERVICE INFORMATION
PRECAUTIONS
Description INFOID:0000000006150940
Observe the following precautions to ensure safe and proper servicing. These precautions are not
described in each individual section.
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER" INFOID:0000000006417975
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 performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including incorrect removal and installation of the SRS can lead to personal
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 har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the
battery, and wait at least 3 minutes before performing any service.
Precaution Necessary for Steering Wheel Rotation After Battery Disconnect
INFOID:0000000006150942
NOTE:
• This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-
TEM).
• Remove and install all control units after disconnecting both battery cables with the ignition knob in the
″LOCK″ position.
• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mech-
anism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible.
If steering wheel rotation is required when battery power is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables.
NOTE:
Supply power using jumper cables if battery is discharged.
Revision: July 2010 2011 Sentra

13. PRECAUTIONS
GI-3
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
K
L
M
B
GI
N
O
P
2. Use the Intelligent Key or mechanical key to turn the ignition switch to the ″ACC″ position. At this time, the
steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be
rotated.
4. Perform the necessary repair operation.
5. When the repair work is completed, return the ignition switch to the ″LOCK″ position before connecting
the battery cables. (At this time, the steering lock mechanism will engage.)
6. Perform a self-diagnosis check of all control units using CONSULT-III.
General Precaution INFOID:0000000006150943
• Do not operate the engine for an extended period of time without
proper exhaust ventilation.
Keep the work area well ventilated and free of any flammable
materials. Special care should be taken when handling any flam-
mable or poisonous materials, such as gasoline, refrigerant gas,
etc. When working in a pit or other enclosed area, be sure to prop-
erly ventilate the area before working with hazardous materials.
Do not smoke while working on the vehicle.
• Before jacking up the vehicle, apply wheel chocks or other tire
blocks to the wheels to prevent the vehicle from moving. After jack-
ing up the vehicle, support the vehicle weight with safety stands at
the points designated for proper lifting before working on the vehi-
cle.
These operations should be done on a level surface.
• When removing a heavy component such as the engine or tran-
saxle/transmission, be careful not to lose your balance and drop
them. Also, do not allow them to strike adjacent parts, especially
the brake tubes and master cylinder.
• Before starting repairs which do not require battery power:
Turn off ignition switch.
Disconnect the negative battery terminal.
• If the battery terminals are disconnected, recorded memory of
radio and each control unit is erased.
• Battery posts, terminals and related accessories contain lead and
lead compounds. Wash hands after handling.
• To prevent serious burns:
Avoid contact with hot metal parts.
Do not remove the radiator cap when the engine is hot.
• Dispose of or recycle drained oil or the solvent used for cleaning
parts in an appropriate manner.
• Do not attempt to top off the fuel tank after the fuel pump nozzle
shuts off automatically.
Continued refueling may cause fuel overflow, resulting in fuel spray
and possibly a fire.
• Clean all disassembled parts in the designated liquid or solvent
prior to inspection or assembly.
SGI285
SGI231
SEF289H
SGI233
Revision: July 2010 2011 Sentra

14. GI-4
< SERVICE INFORMATION >
PRECAUTIONS
• Replace oil seals, gaskets, packings, O-rings, locking washers, cotter pins, self-locking nuts, etc. with new
ones.
• Replace inner and outer races of tapered roller bearings and needle bearings as a set.
• Arrange the disassembled parts in accordance with their assembled locations and sequence.
• Do not touch the terminals of electrical components which use microcomputers (such as ECM).
Static electricity may damage internal electronic components.
• After disconnecting vacuum or air hoses, attach a tag to indicate the proper connection.
• Use only the fluids and lubricants specified in this manual.
• Use approved bonding agent, sealants or their equivalents when required.
• Use hand tools, power tools (disassembly only) and recommended
special tools where specified for safe and efficient service repairs.
• When repairing the fuel, oil, water, vacuum or exhaust systems,
check all affected lines for leaks.
• Before servicing the vehicle:
Protect fenders, upholstery and carpeting with appropriate covers.
Take caution that keys, buckles or buttons do not scratch paint.
WARNING:
To prevent ECM from storing the diagnostic trouble codes, do not carelessly disconnect the harness
connectors which are related to the engine control system and TCM (transmission control module)
system. The connectors should be disconnected only when working according to the WORK FLOW of
TROUBLE DIAGNOSES in EC and CVT sections.
Precaution for Three Way Catalyst INFOID:0000000006150944
If a large amount of unburned fuel flows into the catalyst, the catalyst temperature will be excessively high. To
prevent this, follow the instructions.
• Use unleaded gasoline only. Leaded gasoline will seriously damage the three way catalyst.
• When checking for ignition spark or measuring engine compression, make tests quickly and only when nec-
essary.
• Do not run engine when the fuel tank level is low, otherwise the engine may misfire, causing damage to the
catalyst.
Do not place the vehicle on flammable material. Keep flammable material off the exhaust pipe and the three
way catalyst.
Precaution for Fuel (Unleaded Regular Gasoline Recommended) MR20DE and
QR25DE Except SE-R Spec-V INFOID:0000000006150945
Use unleaded regular gasoline with an octane rating of at least 87 AKI (Anti-Knock Index) number (research
octane number 91). E-85 fuel (85% fuel ethanol, 15% unleaded gasoline) may only be used in vehicles specif-
ically designed for E-85 fuel (i.e. Flexible Fuel Vehicle - FFV models).
CAUTION:
Do not use leaded gasoline. Using leaded gasoline will damage the three way catalyst. Using a fuel
other than that specified could adversely affect the emission control devices and systems, and could
PBIC0190E
SGI234
Revision: July 2010 2011 Sentra

15. PRECAUTIONS
GI-5
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
K
L
M
B
GI
N
O
P
also affect the warranty coverage validity. Do not use E-85 fuel (85% fuel ethanol, 15% unleaded gaso-
line) unless the vehicle is specifically designed for E-85 fuel (i.e. Flexible Fuel Vehicle - FFV models).
Precaution for Fuel (Unleaded Premium Gasoline Required) QR25DE SE-R Spec-V
Only INFOID:0000000006150946
Use unleaded premium gasoline with an octane rating of at least 91 AKI (Anti-Knock Index) number (Research
octane number 96).
If unleaded premium gasoline is not available, unleaded regular gasoline with an octane rating of at least 87
AKI number (Research octane number 91) can be used, but only under the following precautions:
• have the fuel tank filled only partially with unleaded regular gasoline, and fill up with unleaded premium gas-
oline as soon as possible.
• avoid full throttle driving and abrupt acceleration.
However, for maximum vehicle performance, the use of unleaded premium gasoline is recommended.
CAUTION:
Do not use leaded gasoline. Using leaded gasoline will damage the three way catalyst. Do not use E-85
fuel (85% fuel ethanol, 15% unleaded gasoline) unless the vehicle is specifically designed for E-85 fuel
(i.e. Flexible Fuel Vehicle - FFV models). Using a fuel other than that specified could adversely affect
the emission control devices and systems, and could also affect the warranty coverage validity.
Precaution for Multiport Fuel Injection System or Engine Control System INFOID:0000000006150947
• Before connecting or disconnecting any harness connector for the
multiport fuel injection system or ECM:
Turn ignition switch to “OFF” position.
Disconnect negative battery terminal.
Otherwise, there may be damage to ECM.
• Before disconnecting pressurized fuel line from fuel pump to injec-
tors, be sure to release fuel pressure.
• Be careful not to jar components such as ECM and mass air flow
sensor.
Precaution for Hoses INFOID:0000000006150948
HOSE REMOVAL AND INSTALLATION
• To prevent damage to rubber hose, do not pry off rubber hose with
tapered tool or screwdriver.
SGI787
SMA019D
Revision: July 2010 2011 Sentra