2005 HONDA S2000 engine

The exhaust emissions controls
include f our systems: PGM-FI,
ignition timing control, secondary air
injection system, and three way
catalytic converter. These four
systems work together to control the
engine’s combustion and minimize
the amount of HC, CO, and NOx that
comes out the tailpipe. The exhaust
emissions control systems are
separate f rom the crankcase and
evaporative emissions control
systems.
The PGM-FI System uses sequential
multiport f uel injection.
It has three subsystems: air intake,
engine control, and f uel control. The
engine control module (ECM) 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.During engine warm-up, air is
pumped into the exhaust to reduce
emissions when the engine is cold.
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
quality parts may increase the
emissions f rom your vehicle.
This system constantly adjusts the
ignition timing, reducing the amount
of HC, CO, and NOx produced.
The emissions control systems are
covered by warranties separate from
the rest of your vehicle. Read your
warranty manual for more inf orma-
tion.
2
2
Emissions Cont rols
Exhaust Emissions Controls Replacement Parts
PGM-FI Syst emSecondary A ir Inject ion Syst em
Three Way Catalytic Converter
Ignit ion T iming Cont rol Syst em
190

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.
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 com-
bustible materials that come near it.
Parkyourvehicleawayfromhigh
grass, dry leaves, or other f lamma-
bles.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.
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 tuned-up.
Have your vehicle diagnosed and
repaired if it is misf iring, back-
f iring, stalling, or otherwise not
running properly.
Three Way Catalytic Converter
T echnical Inf ormation
191
THREE WAY CATALYTIC CONVERTER

If you take your vehicle f or a state
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 re-tested within the
next two or three days, you can
condition the vehicle f or retesting by
doing the f ollowing.Make sure the gas tank is nearly,
but not completely, f ull (around
3/4). Make sure the vehicle has been
parked with the engine of f f or 8
hours or more.
Make sure the ambient
temperature is between 20° and
95°F.
Without touching the accelerator
pedal, start the engine, and let it
idle f or 20 seconds.
Keep the vehicle in Neutral.
Increase the engine speed to 2,000
rpm,andholditthereuntilthe
temperature gauge rises to at least
1/4of thescale(about3minutes).
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
5th.Donotusethecruisecontrol.
When traffic allows, drive for 90
seconds without moving theaccelerator pedal. (Vehicle speed
may vary slightly; this is okay.) If
you cannot do this f or a
continuous 90 seconds because of
traffic conditions, drive for at least
30 seconds, then repeat it two
more times (for a total of 90
seconds).
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.
If the testing facility determines the
readiness codes are still not set, see
your dealer.
St at e Emissions T est ing
T esting of Readiness Codes
192

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#
) This manual covers maintenance and recommended
procedures f or repair to engine and chassis components.
It is written f or the journeyman mechanic, but is simple
enough f or most mechanically-inclined owners to under-
stand.
This manual complements the service manual by
providing in-depth troubleshooting inf ormation f or each
electrical circuit in your vehicle.
This manual describes the procedures involved in the
replacement of damaged body parts.
Authorized Manuals
Service Manual:
Electrical T roubleshooting Manual:
Body Repair Manual:
198
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CONT INUED
....................................
Accessories .105
ACCESSORY (Ignition Key .......................................
Position) .53
...............
Accessory Power Socket . 69
....................
Additives, Engine Oil . 132
...............................
Airbag (SRS) .9, 19
................
Air Conditioning System . 74
............................................
Usage .76
.......................
Air Pressure, Tires .150
.......................
Alcohol in Gasoline .100
......................................
Antif reeze .134
Anti-lock Brakes (ABS) ...............................
Indicator .41, 119
...................................
Operation .118
.
Anti-thef t Steering Column Lock . 53
............................
Anti-thef t System .94
......................................
Audio Panel .70
..................................
Audio System .78
...
Automatic Seat Belt Tensioners . 17
...............
Automatic Speed Control . 95
........
Back-up Light Replacement . 144Battery
Charging System ...........................
Indicator .40, 170
............................
Jump Starting .166
..............................
Maintenance .154
............................
Specif ications .185
................................
Bef ore Driving .99
....................................
Belts,Seat .8,16
.............................
Beverage Holder .69
..................................
Booster Seats .32
............................................
Brakes .117
...........
Anti-lock System (ABS) . 118
.............
Break-in, New Linings . 100
...........................................
Fluid .139
.........................................
Parking .67
..........................
System Design .118
.................
System Indicator . 40,172
........................
Wear Indicators .118
.............................
Braking System .117
.................
Break-in, New Vehicle . 100
..
Brightness Control, Instruments . 49
........................
Brights, Headlights .48
.........................
Bulb Replacement .140
..........................
Back-up Lights .144
.................................
Headlights .140
...........
Side Turn Signal Lights . 143............................
Specif ications .185
............
Turn Signal Lights . 142,144
..............................
Bulbs, Halogen .140
............................
Capacities Chart .184
.............
Carbon Monoxide Hazard . 35
....................
Cargo, How to Carry .107
..............
CAUTION, Explanation of . ii
...........................................
CD Care .90
.....................................
CD Changer .90
.......
CD Changer Error Messages . 92
........................
CD Error Messages .91
.........................................
CD Player .88
........................
Certif ication Label .182
.................................
Chains, Tires .153
....................
Changing a Flat Tire .159
Changing Oil ........................................
How to .132
......................................
When to .125
...
Charging System Indicator . 40,170
............
Checklist, Bef ore Driving . 113
Index
B A
C
INDEX
I

Î
................
DANGER, Explanation of . ii
...................................
Dashboard .3, 38
................
Daytime Running Lights . 48
Daytime Running Lights .......................................
Indicator .42
.................................
Dead Battery .166
............
Defects, Reporting Safety . 196
................
Def ogger, Rear Window . 50
................
Defrosting the Windows . 77
..........................
Dif f erential Fluid .138
....................................
Dimensions .184
...............
Dimming the Headlights . 48
Dipstick ..................................
Engine Oil .103
..........................
Directional Signals .48
........
Disc Brake Wear Indicators . 118
.....................
Disposal of Used Oil .134 ...................
Do Not Tow a Trailer . 119
Doors ..............
Locking and Unlocking . 54
.......................
Monitor Indicator .41
......................
Power Door Locks .54
..........
DOT Tire Quality Grading . 186
Downshif ting, Manual .............................
Transmission .115
...........
Driver and Passenger Safety . 5
...........................................
Driving .111
....................................
Economy .104
........................
Driving Guidelines .112
..............................
Economy, Fuel .104
..................................
Emergencies .157
.............
Battery, Jump Starting . 166
...........
Brake System Indicator . 172
................
Changing a Flat Tire . 159
.....
Charging System Indicator . 170
..................
Checking the Fuses . 174
...
Closing the Convertible Top . 173
.........
Hazard Warning Flashers . 49
............................
Jump Starting .166
.....
Low Oil Pressure Indicator . 170
.....................................
Child Saf ety .23
..............................
Booster Seats .32
...................................
Child Seats .28
.....
Important Saf ety Reminders . 26
..........................
Larger Children .31
.......................
Risk with Airbags .24
.............................
Small Children .27
.......................................
Child Seats .28
.......................
Cleaning Seat Belts .145
.................................................
Clock .45
...................................
Clutch Fluid .139
........................
CO in the Exhaust .189
............
Cold Weather, Starting in . 114
......................
Compact Spare Tire .158
...............
Consumer Inf ormation . 194
.............
Controls, Instruments and . 37
..............................
Convertible Top .61
...............
Convertible Top Cover . 63
..
Lowering the Convertible Top . 61
................................
Maintenance .65
.....
Raising the Convertible Top . 64
Coolant ........................................
Adding .134
....................................
Checking .104
.........................
Proper Solution .134
...................
Temperature Gauge . 45Crankcase Emission Control
........................................
System .189
................
Cruise Control Indicator . 41
..............
Cruise Control Operation . 95
......................................
Cup Holder .69
.............
Customer Service Of f ice . 194
Index
D
E
II

CONT INUED
.....................................
Fan, Interior .75
...........................................
Features .73
....................
Filling the Fuel Tank . 101
Filters .........................
Dust and Pollen .146
...............................................
Oil .132
.............
Flashers, Hazard Warning . 49
...................
Flat Tire, Changing a . 159
Fluids ..........................................
Brake .139
.........................................
Clutch .139
..............
Manual Transmission . 137
..................
Windshield Washer . 136
..........
FM Stereo Radio Reception . 81
..........................
Four-way Flashers .49
.................................................
Fuel .100
......................
Fill Door and Cap .101
...........................................
Gauge .45
.....................
Low Fuel Indicator .42
................
Octane Requirement . 100
...............................
Oxygenated .100 ........................
Tank, Ref ueling .101
...............................
Fuel Economy .104
..............
Fuel Station Procedures . 101
.....................
Fuses, Checking the .174
...
Malf unction Indicator Lamp . 171
..................
Overheated Engine . 167
.......................................
Towing .179
...........................
Emergency Brake .67
......................
Emergency Flashers .49
......................
Emergency Towing .179
............
Emergency Trunk Opener . 55
.......................
Emissions Controls .189
.............
Emissions Testing, State . 192
Engine ............
Adding Engine Coolant . 134
....
Coolant Temperature Gauge . 45
.........................
If It Won’t Start .164
Malf unction Indicator ................................
Lamp .41, 171
........
Oil Pressure Indicator . 40,170
..............
Oil, What Kind to Use . 131
...............................
Overheating .167
............................
Specif ications .184
............................
Speed Limiter .116
...............................
Start Button .114
.......................................
Starting .114
......................
Ethanol in Gasoline .100
...
Evaporative Emission Controls . 189
...............................
Exhaust Fumes .35 Expectant Mothers, Use of Seat
........................................
Belts by .14
...............
Gas Mileage, Improving . 104
..........................................
Gasohol .100
.........................................
Gasoline .100
...........................................
Gauge .45
.....................
Low Fuel Indicator .42
................
Octane Requirement . 100
........................
Tank, Ref ueling .101
.............................................
Gauges .44
...
Engine Coolant Temperature . 45
...............................................
Fuel .45
Gearshif t Lever Positions ..............
Manual Transmission . 116
Gross Vehicle Weight Rating .............................
(GVWR) .108, 184
Index
F
G
INDEX
III

CONT INUED
Lights....................
Bulb Replacement .140
.......................................
Indicator .40
..................................
Turn Signal .48
....................................
Load Limits .108
......
LOCK (Ignition Key Position) . 53
Locks .......
Anti-thef t Steering Column . 53
............................
Fuel Fill Door .101
.................................
Power Door .54
...........................................
Trunk .54
........................
Low Coolant Level .104
.........................
Low Fuel Indicator .42
...
Low Oil Pressure Indicator . 40,170
...
Lubricant Specif ications Chart . 184
...........
Luggage, Storing (Cargo) . 107..................
New Vehicle Break-in . 100
.....................
Normal Shif t Speeds .116
...................
NOTICE, Explanation of . i
...............
Numbers, Identif ication . 182
..................................
Maintenance .121
Owner’s Maintenance ...................................
Checks .124
........................................
Record .127
......................
Required Indicator .43
..........................................
Saf ety .122
....................................
Schedule .123 .
Malf unction Indicator Lamp . 41,171
...................
Manual Transmission . 115
........
Manual Transmission Fluid . 137
...............................
Meters, Gauges .44
...................
Methanol in Gasoline . 100
..........................
Mirrors, Adjusting .66
...............
Modif ying Your Vehicle . 106
..............
Panel Brightness Control . 49
...........................................
Parking .117
.................................
Parking Brake .67
Parking Brake and Brake System .....................................
Indicator .172
.................................
Parking Lights .48
.............................
PGM-FI System .190
...................................
Pollen Filter .146
..........................
Power Door Locks .54
..................
Power Socket Location . 68
..............................
Power Windows .59
...
Octane Requirement, Gasoline . 100
.........................................
Odometer .44
...............................
Odometer, Trip .44
Oil ........................
Change, How to .132
......................
Change, When to .125
......................
Checking Engine .103
..............
Pressure Indicator . 40,170 Selecting Proper Viscosity
......................................
Chart .132
...........
ON (Ignition Key Position) . 53
Onboard Ref ueling Vapor ....................................
Recovery .189
.........................
Opening the Trunk .54
..............................
Outside Mirrors .66
....................
Overheating, Engine .167
....
Owner’s Maintenance Checks . 124
.........................
Oxygenated Fuels .100
Index
M N
O
P
INDEX
V