2008 HONDA ACCORD SEDAN engine

The PGM-FI system uses sequential
multiport f uel injection. It has three
subsystems: air intake, engine
control, and f uel control. The
powertrain control module (PCM) in
automatic transmission vehicles or
the engine control module (ECM) in
manual transmission vehicles uses
various sensors to determine how
much air is going into the engine. Itthen controls how much f uel to inject
under all operating conditions. The emissions control systems are
designed and certif ied to work to-
gether in reducing emissions to
levels that comply with the Clean Air
Act. To make sure the emissions
remain low, you should use only new
Honda replacement parts or their
equivalent f or repairs. Using lower
qualitypartsmayincreasethe
emissions f rom your vehicle.
The emissions control systems are
covered by warranties separate from
the rest of your vehicle. Read your
warranty manual for more informa-
tion.
This system constantly adjusts the
ignition timing, reducing the amount
of HC, CO, and NOx produced.
The exhaust emissions controls
includethreeorfoursystems:PGM-
FI, ignition timing control, exhaust
gas recirculation (V6 models), and
three way catalytic converter. These
three or four systems work together
to control the engine’s combustion
and minimize the amount of HC, CO,
and NOx that come out the tailpipe.
The exhaust emissions control
systems are separate f rom the
crankcase and evaporative emissions
control systems.
The three way catalytic converter is
in the exhaust system. Through
chemical reactions, it converts HC,
CO, and NOx in the engine’s exhaust
to carbon dioxide (CO ), nitrogen
(N ), and water vapor.
The exhaust gas recirculation (EGR)
system takes some of the exhaust
gas and routes it back into the intake
manif old. Adding exhaust gas to the
air/f uel mixture reduces the amount
of NOx produced when the f uel is
burned.
2
2
V6 models
Exhaust Emissions Controls Replacement Parts
PGM-FI System Exhaust Gas Recirculat ion (EGR)
Syst em
Ignit ion T iming Cont rol Syst em
Three Way Catalytic Converter
Emissions Cont rols
Technical Inf ormation
395
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2008 Accord Sedan

The three way catalytic converter
contains precious metals that serve
as catalysts, promoting chemical
reactions to convert the exhaust
gasses without af f ecting the metals.
The catalytic converter is ref erred to
as a three-way catalyst, since it acts
on HC, CO, and NOx. A replacement
unit must be an original Honda part
or its equivalent.Always use unleaded gasoline.
Even a small amount of leaded
gasoline can contaminate the
catalyst metals, making the three
way catalytic converter inef f ective.Keep the engine well maintained.
The three way catalytic converter
must operate at a high temperature
for the chemical reactions to take
place. It can set on f ire any
combustible materials that come
near it. Park your vehicle away from
high grass, dry leaves, or other
f lammables. A defective three way catalytic
converter contributes to air pollution,
and can impair your engine’s per-
f ormance. Follow these guidelines to
protect your vehicle’s three way
catalytic converter.
Have your vehicle diagnosed and
repaired if it is misf iring, back-
f iring, stalling, or otherwise not
running properly.
Three Way Catalytic Converter
396
THREE WAY CATALYTIC CONVERTER
THREE WAY CATALYTIC CONVERTERS
2.4
engine models V6 models
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2008 Accord Sedan

Make sure the gas tank is nearly,
but not completely, f ull (around
3/4).Without touching the accelerator
pedal, start the engine, and let it
idle f or 20 seconds.
If you take your vehicle f or an
emissions test shortly af ter the
battery has been disconnected or
gone dead, it may not pass the test.
This is because of certain ‘‘readiness
codes’’ that must be set in the on-
board diagnostics f or the emissions
systems. These codes are erased
when the battery is disconnected,
and set again only after several days
of driving under a variety of
conditions. If the testing f acility determines that
the readiness codes are not set, you
will be requested to return at a later
date to complete the test. If you must
get the vehicle retested within the
next two or three days, you can
condition the vehicle f or retesting by
doing the f ollowing.
Make sure the vehicle has been
parked with the engine of f f or 6
hours or more.
Make sure the ambient
temperature is between 40° and
95°F. Keep the vehicle in Park
(automatic) or neutral (manual).
Increase the engine speed to 2,000
rpm,andholditthereuntilthe
temperature gauge rises to at least
1/4of thescale(about3minutes).
Without touching the accelerator
pedal, let the engine idle f or 20
seconds.
1.
2.
3. 4.
5.
6.
CONT INUED
T esting of Readiness Codes
Emissions T esting
Technical Inf ormation
397
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2008 Accord Sedan

Select a nearby lightly traveled
major highway where you can
maintain a speed of 50 to 60 mph
(80to97km/h)foratleast20
minutes. Drive on the highway in
D (automatic) or 5th (manual). Do
notusethecruisecontrol.When
traffic allows, drive for 90 seconds
without moving the accelerator
pedal. (Vehicle speed may vary
slightly; this is okay.) If you cannot
do this f or a continuous 90
seconds because of traf f ic
conditions, drive f or at least 30
seconds, then repeat it two more
times (for a total of 90 seconds).If the testing f acility determines the
readiness codes are still not set, see
your dealer.Then drive in city/suburban
traffic for at least 10 minutes.
When traf f ic conditions allow, let
the vehicle coast f or several
seconds without using the
accelerator pedal or the brake
pedal.
Make sure the vehicle has been
parked with the engine of f f or 30
minutes.
7. 8.
9.
Emissions T esting
398
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2008 Accord Sedan

T he publications shown below can be purchased f rom Helm
Incorporated. You can order by phone or online:Call Helm Inc. at 1-800-782-4356 (credit card orders only)
Go online at
If you are interested in other years or models, contact Helm Inc.
at 1-800-782-4356.Covers maintenance and recommended procedures f or
repair to engine and chassis components. It is written
f or the journeyman mechanic, but it is simple enough
f or most mechanically inclined owners to understand.
Complements the Service Manual by providing in-depth
troubleshooting inf ormation f or each electrical circuit
in your vehicle.
Describes the procedures involved in the replacement
of damaged body parts.
Authorized Manuals
Purchasing Factory Authorized Manuals Service Manual:
Electrical T roubleshooting Manual:
Body Repair Manual:
(U.S. only)
Authorized Manuals
403
Form Description
2008 Honda Accord 2/4 door L4 Service Manual Base Book
2008 Honda Accord 2/4 door V6 Service Manual Supplement2008 Honda 2/4 Door L4/V6
Electrical Troubleshooting Manual
2008 Honda 2/4 door Body Repair Manual
2008 Honda Accord 4-door Owner’s Manual 2008 Honda Accord
Navigation System Owner’s Manual
2008 Honda Accord Honda Service History
2008 Honda Accord 4-door Quick Start Guide Order Form for Previous Years-
Indicate Year and Model Desired
Publication
Form Number 61TA000
61TA001
61TA000EL 61TA030
31TA5600
31TA5800
31TA5M00 31TA5Q00 HON-R
www. helminc. com
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2008 Accord Sedan

CONT INUED
...................
Capacities Chart .384,386
.............
Carbon Monoxide Hazard .51
.............................
Carrying Cargo .273
.............
CAUTION, Explanation of .iii
....................................
Accessories .271
ACCESSORY
...............
(Ignition Key Position) .78
............
Accessory Power Sockets .111
..................
Active Head Restraints .96
....................
Additives, Engine Oil .317
...........................
Advanced Airbags .25
...............................
Airbag (SRS) .9,21
..........
Airbag System Components .21
......
Air Conditioning System .120,125
.................................
Usage .123,126
.......................
Air Pressure, Tires .343
......................................
Antif reeze .320
Anti-lock Brakes (ABS)
...............................
Indicator .58,291
...................................
Operation .291
..............
Anti-thef t, Audio System .213
.
Anti-thef t Steering Column Lock .78
................................
Audio System .133
.....
Auto Door Locking/Unlocking .80
...
Automatic Seat Belt Tensioners .19
.............
Automatic Speed Control .223
..............
Automatic Transmission .284
..................
Capacity, Fluid .384,386 .......................................
Shif ting .284
Shif t Lever Position
...............................
Indicators .284
................
Shif t Lever Positions .284
....................
Shif t Lock Release .287
......................
Auxiliary Input Jack .212
Battery
Charging System ...........................
Indicator .56,369
............................
Jump Starting .364
..............................
Maintenance .351
....................
Specif ications .385,387
..............................
Bef ore Driving .259
....................................
Belts,Seat .8,18
.........................
Beverage Holders .111
.......
Bluetooth
HandsFreeLink.231
..................................
Booster Seats .48
Brakes
...........
Anti-lock System (ABS) .291
.............
Break-in, New Linings .260
....................
Bulb Replacement .334
...........................................
Fluid .326
.......................................
Parking .109 .................
System Indicator .57,371
........................
Wear Indicators .290
.............................
Braking System .290
.................
Break-in, New Vehicle .260
..
Brightness Control, Instruments .72
........................
Brights, Headlights .69
Bulb Replacement
..........................
Back-up Lights .334
..............................
Brake Lights .334
.................................
Fog Lights .336
................
Front Parking Lights .332
.................................
Headlights .329
.........
High-mount Brake Light .335
................................
Rear Lights .334
....................
Specif ications .385,387
............
Turn Signal Lights .332,334
......................
Bulbs, Halogen .329,336
Index
A
B
C
INDEX
I
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Î
...............
DANGER, Explanation of .iii
...................................
Dashboard .3,54
..........
Daytime Running Lights .61,71
Daytime Running Lights
.......................................
Indicator .61
.................................
Dead Battery .364
.........
Def ects, Reporting Saf ety .402
................
Def ogger, Rear Window .74
......
Def rosting the Windows .124,129
............................
Dimensions .384,386
...............
Dimming the Headlights .69
Dipstick
..........
Automatic Transmission .323
..................................
Engine Oil .266
..........................
Directional Signals .69
........
Disc Brake Wear Indicators .290
.....................
Disposal of Used Oil .319
Doors
..........................
Auto Door Lock .80
.......................
Auto Door Unlock .83
..............
Childproof Door Locks .86
..............
Locking and Unlocking .79
..........
DOT Tire Quality Grading .388
.........................................
CD Care .206
..........................
CD Changer .163,194
.......................................
CD Player .141
........................
Certif ication Label .382
............................................
Chains .349
....................
Changing a Flat Tire .357
Changing Oil
........................................
How to .318
......................................
When to .307
...
Charging System Indicator .56,369
............
Check Fuel Cap Message .262
............
Checklist, Bef ore Driving .280
.....................................
Child Saf ety .33
..............................
Booster Seats .48
.............................
Child Seats .40,41
Important Saf ety
..........................
Reminders .30-50
..........................................
Inf ants .38
..........................
Larger Children .47
.........................................
LATCH .42
......................
Risks with Airbags .34
.............................
Small Children .39
..........................................
Tether .46
...........................
Warning Labels .52
..........
Where Should a Child Sit .34 .......................................
Child Seats .33
.........................................
LATCH .42
..........
Tether Anchorage Points .46
..................
Childproof Door Locks .86
................
Cleaning the Seat Belts .338
...............
Climate Control System .125
..............................................
Clock .214
...................................
Clutch Fluid .327
..................
CO in the Exhaust .51,396
............
Cold Weather, Starting in .281
..............................
Compact Spare .356
.........................................
Compass .219
.................
Console Compartment .112
.................
Consumer Inf ormation .400
.............
Controls, Instruments and .53
Coolant
........................................
Adding .320
....................................
Checking .267
.........................
Proper Solution .320
...................
Temperature Gauge .66
Crankcase Emissions Control ........................................
System .394
................
Cruise Control Indicator .62
............
Cruise Control Operation .223
.............
Customer Service Of f ice .400
Index
D
II
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2008 Accord Sedan

CONT INUED
Downshif ting, Manual.............................
Transmission .282
...........
Driver and Passenger Safety .5
...........................................
Driving .279
....................................
Economy .268
..........
Dual Temperature Control .130
..................
Dust and Pollen Filter .339
..............................
Economy, Fuel .268
..................................
Emergencies .355
.............
Battery, Jump Starting .364
...........
Brake System Indicator .371
................
Changing a Flat Tire .357
.....
Charging System Indicator .369
.........
Hazard Warning Flashers .73
............................
Jump Starting .364
..................
Checking the Fuses .372
.....
Low Oil Pressure Indicator .369
...
Malf unction Indicator Lamp .370
..................
Overheated Engine .367
.......................................
Towing .379
.........................
Emergency Brake .109
......................
Emergency Flashers .73
......................
Emergency Towing .379 .......................
Emissions Controls .394
........................
Emissions Testing .397
Engine
............
Adding Engine Coolant .320
....
Coolant Temperature Gauge .66
.........................
If It Won’t Start .362
...
Malf unction Indicator Lamp .370
.......................
Oil Lif e Indicator .307
..............
Oil Pressure Indicator .369
..............
Oil, What Kind to Use .316
...............................
Overheating .367
....................
Specif ications .384,386
....................
Speed Limiter .283,287
.......................................
Starting .281
..........
Engine Speed Limiter .283,287
......................
Ethanol in Gasoline .261
.
Evaporative Emissions Controls .394
...............................
Exhaust Fumes .51
Expectant Mothers, Use of Seat
........................................
Belts by .16
..........................
Fan, Interior .121,128
.........................................
Features .119
....................
Filling the Fuel Tank .261 Filters
........................
Dust and Pollen .339
...............................................
Oil .318
.............
Flashers, Hazard Warning .73
...................
Flat Tire, Changing a .357
Fluids
..........
Automatic Transmission .324
..........................................
Brake .326
.........................................
Clutch .327
..............
Manual Transmission .325
..........................
Power Steering .327
..................
Windshield Washer .322
........................................
Fog Lights .72
...........................
Folding Rear Seat .97
..........................
Four-way Flashers .73
..............................
Front Airbags .9,23
.................................................
Fuel .260
........
Check Fuel Cap Message .262
......................
Fill Door and Cap .261
...........................................
Gauge .66
.....................
Low Fuel Indicator .61
................
Octane Requirement .260
...............................
Oxygenated .261
........................
Tank, Ref ueling .261
Index
INDEX
E
F
III
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