2012 HONDA ACCORD COUPE engine

The exhaust emissions controls
includethreeorfoursystems:
PGM-FI, ignition timing control,
exhaust gas recirculation (6-cylinder
models), and three way catalytic
converter. These 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 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.
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. It
then controls how much f uel to inject
under all operating conditions.
This system constantly adjusts the
ignition timing, reducing the amount
of HC, CO, and NOx produced.
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
Emissions Cont rols
Three Way Catalytic Converter
PGM-FI System Ignit ion T iming Cont rol Syst em
Exhaust Gas Recirculat ion (EGR)Syst em
431

Technical Inf ormation
2012 Accord Coupe

Keep the engine well maintained.
Have your vehicle diagnosed and
repaired if it is misf iring, back-
f iring, stalling, or otherwise not
running properly.
The three way catalytic converters
contain precious metals that serve as
catalysts, promoting chemical
reactions to convert the exhaust
gasses without af f ecting the metals.
The catalytic converters are ref erred
to as three-way catalysts, since they
act on HC, CO, and NOx.
Replacement units must be original
Honda parts or their equivalent.
The three way catalytic converters
must operate at a high temperature
for the chemical reactions to take
place. They can set on f ire any
combustible materials that come
near them. Park your vehicle away
f rom high grass, dry leaves, or other
f lammables.
Defectivethreewaycatalytic
converters contribute to air pollution,
and can impair your engine’s
perf ormance. Follow these
guidelines to protect your vehicle’s
three way catalytic converters.
Always use unleaded gasoline.
Even a small amount of leaded
gasoline can contaminate the
catalyst metals, making the three
way catalytic converters
inef f ective.
Three Way Catalytic Converters
432
THREE WAY CATALYTIC CONVERTERS
V6 models
THREE WAY CATALYTIC CONVERTERS
4-cylinder models

Technical Inf ormation
2012 Accord Coupe

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 (4° and 35°C). 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
433

Technical Inf ormation
2012 Accord Coupe

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
434

Technical Inf ormation
2012 Accord Coupe

µµ
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
439
Publication
Form Number 61TA006
61TA602
61TA005EL 61TA030
31TE0640
31TA5840
31TA5M40 31TE0Q40
HON-R Form Description
2008 2012 Honda Accord 2/4 door L4 Service Manual
2008 2012 Honda Accord 2/4 door V6 Service Manual
2012 Honda 2/4 Door L4/V6
Electrical Troubleshooting Manual
2008 Honda 2/4 door Body Repair Manual
2012 Honda Accord 2-door Owner’s Manual 2012 Honda Accord
Navigation System Owner’s Manual
2012 Honda Accord Honda Service History 2012 Honda Accord 2-door
Technology Reference Guide
Order Form for Previous Years-
Indicate Year and Model Desired
www.helminc.com

2012 Accord Coupe

CONT INUED
BatteryCharging System ...........................
Indicator .56, 405
............................
Jump Starting .400
..............................
Maintenance .387
....................
Specif ications .421, 423
..............................
Bef ore Driving .283
....................................
Belts,Seat .8,17
.........................
Beverage Holders .116
........
HandsFreeLink. 257
..................................
Booster Seats .48
Brakes ...........
Anti-lock System (ABS) . 322
.............
Break-in, New Linings . 284....................
Bulb Replacement .370
...........................................
Fluid .362
.......................................
Parking .114
.................
System Indicator . 57,407
........................
Wear Indicators .321
.............................
Braking System .321
.................
Break-in, New Vehicle . 284
..
Brightness Control, Instruments . 73
Bulb Replacement ..........................
Back-up Lights .370
..............................
Brake Lights .370
.................................
Fog Lights .372
................
Front Parking Lights . 368
.................................
Headlights .365
.........
High-mount Brake Light . 371
................................
Rear Lights .370
....................
Specif ications .421, 423
............
Turn Signal Lights . 368,370
......................
Bulbs, Halogen .365, 372
...................
Capacities Chart . 420,422
.............
Carbon Monoxide Hazard . 51
....................................
Accessories .296
ACCESSORY ...............
(Ignition Key Position) . 79
............
Accessory Power Sockets . 118
..................
Active Head Restraints . 99
....................
Additives, Engine Oil . 351
...........................
Advanced Airbags .25
...............................
Airbag (SRS) .9, 21
..........
Airbag System Components . 21
......
Air Conditioning System . 124,130
.................................
Usage .127, 131
...............
Air Pressure, Tires . 379,380
......................................
Antif reeze .354
Anti-lock Brakes (ABS) ...............................
Indicator .58, 322
...................................
Operation .322
..............
Anti-thef t, Audio System . 240
.
Anti-thef t Steering Column Lock . 79
................................
Audio System .138
.....
Auto Door Locking/Unlocking . 81
...
Automatic Lighting Off Feature . 72
...
Automatic Seat Belt Tensioners . 19
.............
Automatic Speed Control . 250..............
Automatic Transmission . 309
..................
Capacity, Fluid . 420,422
..........................
Paddle Shif ters .315
.......................................
Shif ting .310
Shif t Lever Position ...............................
Indicators .309
................
Shif t Lever Positions . 310
....................
Shif t Lock Release . 313
......................
Auxiliary Input Jack .239Bluetooth
Index
A
BC
I

2012 Accord Coupe

.............................
Carrying Cargo .298
.............
CAUTION, Explanation of . iii
.........................................
CD Care .232
..........................
CD Changer .153, 201
........................
Certif ication Label .418
............................................
Chains .385
....................
Changing a Flat Tire .393
Changing Oil ........................................
How to .352
......................................
When to .341
...
Charging System Indicator . 56,405
............
Check Fuel Cap Message . 287
............
Checklist, Bef ore Driving . 304
.....................................
Child Saf ety .33
..............................
Booster Seats .48
.............................
Child Seats .40, 41
Important Saf ety ..........................
Reminders .33-50
..........................................
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
................
Cleaning the Seat Belts . 374
...............
Climate Control System . 130
..........................
On/Off Button .132
..............................................
Clock .241
...................................
Clutch Fluid .363
..................
CO in the Exhaust . 51,430
............
Cold Weather, Starting in . 305
..............................
Compact Spare .392
.........................................
Compass .246
.................
Console Compartment . 117
.................
Consumer Inf ormation . 436
.............
Controls, Instruments and . 53
Coolant ........................................
Adding .354
....................................
Checking .292
.........................
Proper Solution .354
...................
Temperature Gauge . 65
Crankcase Emissions Control ........................................
System .430
................
Cruise Control Indicator . 62
............
Cruise Control Operation . 250
...................................
Cup Holders .116
.........................
Customer Service .436 ...............
DANGER, Explanation of . iii
...................................
Dashboard .3, 54
..........
Daytime Running Lights . 60,72
Daytime Running Lights .......................................
Indicator .60
.................................
Dead Battery .400
............
Def ects, Reporting Saf ety . 438
................
Def ogger, Rear Window . 75
......
Def rosting the Windows . 128,134
............................
Dimensions .420, 422
...............
Dimming the Headlights . 70
Dipstick ..........
Automatic Transmission . 357
..................................
Engine Oil .291
..........................
Directional Signals .70
........
Disc Brake Wear Indicators . 321
.....................
Disposal of Used Oil .353
Doors ..........................
Auto Door Lock .81
.......................
Auto Door Unlock .84
..............
Locking and Unlocking . 80
..........
DOT Tire Quality Grading . 424
Downshif ting, Manual .............................
Transmission .306
Index
D
II

2012 Accord Coupe

CONT INUED
....................
D-Paddle Shif t Mode .315
...........
Driver and Passenger Safety . 5
...........................................
Driving .303
....................................
Economy .293
Driving Position Memory ........................................
System .103
..........
Dual Temperature Control . 135
..................
Dust and Pollen Filter . 375
..............................
Economy, Fuel .293
Electronic Stability Control (ESC) ........................................
System .324
..................................
Emergencies .391
.............
Battery, Jump Starting . 400
...........
Brake System Indicator . 407
................
Changing a Flat Tire . 393
.....
Charging System Indicator . 405
.........
Hazard Warning Flashers . 74
............................
Jump Starting .400
..................
Checking the Fuses . 408
.....
Low Oil Pressure Indicator . 405
...
Malf unction Indicator Lamp . 406
..................
Overheated Engine . 403
.......................................
Towing .415 .........................
Emergency Brake .114
......................
Emergency Flashers .74
......................
Emergency Towing .415
............
Emergency Trunk Opener . 92
.......................
Emissions Controls .430
........................
Emissions Testing .433
Engine ............
Adding Engine Coolant . 354
....
Coolant Temperature Gauge . 65
.........................
If It Won’t Start .398
...
Malf unction Indicator Lamp . 406
.......................
Oil Lif e Indicator .341
..............
Oil Pressure Indicator . 405
..............
Oil, What Kind to Use . 350
...............................
Overheating .403
....................
Specif ications .420, 422
....................
Speed Limiter . 308,313
.......................................
Starting .305
................................................
V6 .422
...................................
4-cylinder .420
..........
Engine Speed Limiter . 308,313
......................
Ethanol in Gasoline .285
.
Evaporative Emissions Controls . 430
...............................
Exhaust Fumes .51
Expectant Mothers, Use of Seat ........................................
Belts by .15 ..........................
Fan, Interior .125, 133
.........................................
Features .123
....................
Filling the Fuel Tank . 286
Filters ........................
Dust and Pollen .375
...............................................
Oil .352
.............
Flashers, Hazard Warning . 74
...................
Flat Tire, Changing a . 393
.....................................
Floor Mats .375
Fluids ..........
Automatic Transmission . 357
..........................................
Brake .362
.........................................
Clutch .363
..............
Manual Transmission . 359
..........................
Power Steering .363
..................
Windshield Washer . 356
........................................
Fog Lights .73
.........................
Folding Rear Seat .100
..........................
Four-way Flashers .74
..............................
Front Airbags .9 ,23
Index
E F
III

2012 Accord Coupe