2004 HONDA S2000 check engine

Saf ely pull of f the road, and shut
of f the engine. Turn on the hazard
warning indicators.
Let the vehicle sit f or a minute.
Open the hood, and check the oil
level (see page ). An engine
very low on oil can lose pressure
during cornering and other driving
maneuvers.
If necessary, add oil to bring the
level back to the full mark on the
dipstick (see page ).
Start the engine, and watch the oil
pressure indicator. If it does not go
out within 10 seconds, turn of f the
engine. There is a mechanical
problem that needs to be repaired
bef ore you can continue driving
(seeon page
). If the charging system
indicator comes on brightly
when the engine is running, the
battery is not being charged.
Immediately turn of f all electrical
accessories. Try not to use other
electrically operated controls such as
the power windows. Keep the engine
running; starting the engine will
discharge the battery rapidly.
Go to a service station or garage
where you can get technical
assistance.
This indicator should never
come on when the engine is
running. If it starts f lashing or stays
on, the oil pressure has dropped very
low or lost pressure. Serious engine
damage is possible and you should
take immediate action. 1.
2.
3.
4.103
129
176
L ow Oil Pressure Indicator, Charging System Indicator
T aking Care of t he Unexpect ed
L ow Oil Pressure Indicator
Emergency T owingCharging System Indicator
166
NOTICE:
Running the engine with low
oil pressure can cause serious
mechanical damage almost immediately.
Turn of f the engine as soon as you can
saf ely get the vehicle stopped.

If you have recently ref ueled your
vehicle, the indicator coming on
could be a loose or missing f uel f ill
cap. Tighten the cap until it clicks at
least three times. Tightening the cap
will not turn the indicator of f
immediately; it takes at least three
days of normal driving.Your vehicle has certain ‘‘readiness
codes’’ that are part of the on-board
diagnostics f or the emissions
systems. In some states, part of the
emissions testing is to make sure
these codes are set. If they are not
set, the test cannot be completed.If your vehicle battery has been
disconnected or gone dead, these
codes are erased. It takes at least
three days of driving under various
conditions to set the codes again.
To check if they are set, turn the
ignition to ON (II), without starting
the engine. The Malf unction
Indicator Lamp will come on f or 20
seconds. If it then goes of f , the
readiness codes are set. If it blinks 5
times, the readiness codes are not
set. If possible, do not take your
vehicle f or a state emissions test
until the readiness codes are set.
Refer to State Emissions Testing for
more inf ormation, on page .
If this indicator comes on
while driving, it means one
of the engine’s emission control
systems may have a problem. Even
though you may f eel no dif f erence in
your vehicle’s perf ormance, it can
reduce your f uel economy and cause
increased emissions. Continued
operation may cause serious damage. If the indicator comes on repeatedly,
even though it may go of f as you
continue driving, have your vehicle
checked by a dealer as soon as
possible.
188
T aking Care of t he Unexpect ed
Malf unction Indicator L amp
Readiness Code
167
NOTICE:If you keep driving with the
Malf unction Indicator Lamp on, you
can damage your vehicle’s emissions
controls and the engine. Those repairs
may not be covered by your vehicle’s
warranties.

The interior f use box is underneath
the dashboard on the driver’s side.There are two under-hood f use
boxes in the engine compartment.
The primary under-hood f use box is
onthepassenger’ssidenexttothe
battery. To open it, push the two tabs
as shown.
The auxiliary f use box is on the
driver’s side, near the brake f luid
reservoir. To open it, push the tab on
each side, and remove the lid.If something electrical in your
vehicle stops working, check f or a
blown f use f irst. Determine f rom the
chart on pages and ,or the
diagram on the f use box lid, which
f uses control that device. Check
those fuses first, but check all the
f uses bef ore deciding that a blown
f use is the cause. Replace any blown
f uses, and check if the device works.
172 173
Fuses
T aking Care of t he Unexpect ed
Checking and Replacing Fuses
170
INTERIOR
UNDERHOOD
(AUXILIARY)
UNDERHOOD
(PRIMARY)

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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:
196
NOTE: Dealers and Companies please provide dealer or company name,
and also the name of the person to whose attention the shipment should
be sent. For purchases outside U.S.A. please write to the address shown
below for a quotation.
P.O. BOX 07280·DETROIT, MICHIGAN 48207·1-800-782-4356
Customer Name Attention
Apartment Number
State & Zip Code
City
Daytime Telephone Number
Check or money order enclosed payable to Helm Inc U.S. funds only.
Do not send cash
Master
Card VISA
Check here if your billing address is different
from the shipping address shown above.
Account Number Expiration: Mo. Yr.
CUSTOMER SIGNATURE DATE
Street Address No P.O. Box Number
()
These Publications cannot be returned for credit without receiving advance authorization within 14
days of delivery. On returns, a restocking fee may be applied against the original order.

CONT INUED
Accessories.................................
Installation .105
...............
Accessory Power Socket . 70
ACCESSORY (Ignition Key .......................................
Position) .53
....................
Additives, Engine Oil . 130
...............................
Airbag (SRS) .9, 18
..............................
Air Conditioning .74
.......................
Air Pressure, Tires .146
.............................
Alarm, Anti-theft .53
......................................
Antif reeze .132
Anti-lock Brakes (ABS) ....................
Indicator Light .41, 118
...................................
Operation .117
.
Anti-thef t Steering Column Lock . 53
............................
Anti-thef t System .94
......................................
Audio Panel .71
..................................
Audio System .78
...............
Automatic Speed Control . 95 ............................
Capacities Chart .180
.............
Carbon Monoxide Hazard . 34
........................
Cargo, .107
..............
CAUTION, Explanation of . ii
...........................................
CD Care .85
........................
CD Error Messages .86
.....................................
CD Changer .84
.......
CD Changer Error Messages . 87
.........................................
CD Player .83
........................
Certif ication Label .178
...................................
Chains, .150
Changing Oil ........................................
How to .130
......................................
When to .121
....................
Changing a Flat Tire .155
...
Charging System Indicator . 40,166
............
Checklist, Bef ore Driving . 112
........
Back-up Light Replacement . 141Battery
Charging System ...........................
Indicator .40, 166
............................
Jump Starting .162
..............................
Maintenance .151
............................
Specif ications .181
................................
Bef ore Driving .99
....................................
Belts,Seat .8,15
.............................
Beverage Holder .70
..................................
Booster Seats .31
............................................
Brakes .116
...........
Anti-lock System (ABS) . 117
.............
Break-in, New Linings . 100
...........................................
Fluid .136
.........................................
Parking .67
.................
System Indicator . 40,168
..............
Wear Indicators, Disc . 117
.............................
Braking System .116
.................
Break-in, New Vehicle . 100
..
Brightness Control, Instruments . 49
........................
Brights, Headlights .48
.........................
Bulb Replacement .137
..........................
Back-up Lights .141
.................................
Headlights .137
...........
Side Turn Signal Lights . 139
............................
Specif ications .181 ............
Turn Signal Lights . 139,141
..............................
Bulbs, Halogen .137
how to carry
tires
Index
B A C
I

..............................
Economy, Fuel .104
............
Emergencies on the Road . 153
.............
Battery, Jump Starting . 162
................
Changing a Flat Tire . 155
.....
Charging System Indicator . 166
..................
Checking the Fuses . 170
.........
Hazard Warning Flashers . 49
.....
Low Oil Pressure Indicator . 166
...
Malf unction Indicator Lamp . 167
..................
Overheated Engine . 163
...........................
Emergency Brake .67
......................
Emergency Flashers .49
............
Emergency Trunk Opener . 55
.......................
Emissions Controls .185
.....................................
Child Saf ety .22
..............................
Booster Seats .31
...................................
Child Seats .26
.....
Important Saf ety Reminders . 25
..........................
Larger Children .30
......................
Risk With Airbags .23
.............................
Small Children .26
.......................................
Child Seats .26
Cleaning .................................
Floor Mats .143
...................................
Seat Belts .143
...................................
Clutch Fluid .136
........................
CO in the Exhaust .185
.........................
Compact .154
.............
Controls, Instruments and . 70
..............................
Convertible Top .61
...............
Convertible Top Cover . 63
..
Lowering the Convertible Top . 61
................................
Maintenance .65
.....
Raising the Convertible Top . 64
Coolant ........................................
Adding .132
....................................
Checking .103
.........................
Proper Solution .132
...................
Temperature Gauge . 45Crankcase Emission Control
........................................
System .185
..............
Cruise Control Operation . 95
................
Cruise Control Indicator . 42
......................................
Cup Holder .70
Customer Relations ................................
Inf ormation .192
................
DANGER, Explanation of . ii
.......................................
Dashboard .38
................
Daytime Running Lights . 48
Daytime Running Lights .......................................
Indicator .42
.................................
Dead Battery .162
............
Def ects, Reporting Saf ety . 194
................
Def rosting the Windows . 77
....................................
Dimensions .180
...............
Dimming the Headlights . 48
Dipstick ..................................
Engine Oil .103
..........................
Directional Signals .48
........
Disc Brake Wear Indicators . 117
.....................
Disposal of Used Oil .132
...................
Do Not Tow a Trailer . 118Doors
..............
Locking and Unlocking . 54
..............................
Monitor Light .41
......................
Power Door Locks .54
..........
DOT Tire Quality Grading . 182
Downshif ting, 6-speed Manual
.............................
Transmission .114
...........................................
Driving .111
....................................
Economy .104
spare tire
Index
D
E
II

CONT INUED
.............
Halogen Headlight Bulbs . 137
..............
Hazard Warning Flashers . 49
Headlights ............
Daytime Running Lights . 48
..................
High Beam Indicator . 42
...........................
Reminder Tone .48
........
Replacing Halogen Bulbs . 137
...................................
Turning on .48
.........
Heating and Cooling System . 74
.................
High-Low Beam Switch . 48
................
High Speed, Shif ting at . 115
.............
Emissions Testing, State . 188
Engine .......................................
Coolant .132
....
Coolant Temperature Gauge . 45
Malf unction Indicator ................................
Lamp .41, 167
........
Oil Pressure Indicator . 40,166
..............
Oil, What Kind to Use . 129
...............................
Overheating .163
............................
Specif ications .180
............................
Speed Limiter .115
.......................................
Starting .113
...................
Engine, .160
......................
Ethanol in Gasoline .100
...
Evaporative Emission Controls . 185
...............................
Exhaust Fumes .34
Expectant Mothers, Use of Seat ........................................
Belts by .14
.....................................
Fan, Interior .75
Features, Comfort and ................................
Convenience .73
....................
Filling the Fuel Tank . 101Filters
...............................................
Oil .130
.............
Flashers, Hazard Warning . 49
...................
Flat Tire, Changing a . 155
Fluids ..........................................
Brake .136
.........................................
Clutch .136
..............
Manual Transmission . 134
..................
Windshield Washer . 134
..........
FM Stereo Radio Reception . 81
..........................
Four-way Flashers .49
.................................................
Fuel .100
......................
Fill Door and Cap .101
...........................................
Gauge .45
................
Octane Requirement . 100
........................
Reserve Indicator .42
........................
Tank, Filling the .101
..............
Fuel Mileage, Improving . 104
..............
Fuel Station Procedures . 101
.....................
Fuses, Checking the .170
.........................................
Gasoline .100
...............
Fuel Reserve Indicator . 42
...........................................
Gauge .45 ................
Octane Requirement . 100
........................
Tank, Filling the .101
.............................................
Gauges .44
...
Engine Coolant Temperature . 45
...............................................
Fuel .45
...............................
Speedometer .44
.................................
Tachometer .44
Gearshif t Lever Positions 6-speed Manual .........................
Transmission .114
if it won’t start
Index
F
GH
III

CONT INUED
..............
Panel Brightness Control . 49
.................................
Parking Brake .67
.................................
Parking Lights .48
.............................
PGM-FI System .186
Power ..................................
Door Locks .54
..............
Engine, Specif ications . 180
.........................................
Mirrors .66
......................................
Windows .59
..........................
Power Door Locks .54
..................
Power Socket Location . 70..............................
Power Windows .59
.........
Pregnancy, Using Seat Belts . 14
.........
Protecting Adults and Teens . 10
...
Additional Safety Precautions . 15
.....
Advice f or Pregnant Women . 14
........................
Protecting Children .22
.....................
General Guidelines .22
.......
Protecting Larger Children . 30
.........
Protecting Small Children . 26
..................................
Maintenance .119
Owner’s Maintenance ...................................
Checks .122
........................................
Record .125
....................................
Schedule .121
..
Maintenance Required Indicator . 43
.
Malf unction Indicator Lamp . 41,167
...................
Manual Transmission . 114
........
Manual Transmission Fluid . 134
...............................
Meters, Gauges .44
..........................
Mirrors, Adjusting .66
...............
Modif ying Your Vehicle . 106
..................
New Vehicle Break-in . 100
.....................
Normal Shif t Speeds .115
..................
NOTICE, Explanation of . ii
...............
Numbers, Identif ication . 178
...
Octane Requirement, Gasoline . 100
.........................................
Odometer .44 ...............................
Odometer, Trip .44
Oil ........................
Change, How to .130
......................
Change, When to .121
......................
Checking Engine .103
..............
Pressure Indicator . 40,166
Selecting Proper Viscosity ......................................
Chart .130
...........
ON (Ignition Key Position) . 53
.........................
Opening the Trunk .54
..............................
Outside Mirrors .66
....................
Overheating, Engine .163
...................
Radiator Overheating . 163
.......................
Radio Sound System .78
...................
Readiness Codes . 167,188
..
Rear Lights, Bulb Replacement . 141
............................
Rear View Mirror .66
................
Reclining the Seat-backs . 58
.......
Recommended Shif t Speeds . 115
Recovery Vehicle, Emergency .......................................
Towing .176
.............................
Reminder Lights .40
.......................
Remote Transmitter .56
Index
M
N
O P
R
V