2004 HONDA ODYSSEY engine

The exhaust emissions controls
include f our systems: PGM-FI,
Ignition Timing Control, Exhaust
Gas Recirculation 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 Fuel Control.
The Powertrain Control Module
(PCM) 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.
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 ), dinitrogen
(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 f or more informa-
tion.
2
2
Exhaust Emissions Controls Replacement Parts
PGM-FI Syst emIgnit ion T iming Cont rol Syst em
Exhaust Gas Recirculat ion (EGR)Syst em
Three Way Catalytic Converter
T echnical Inf ormation
Emissions Cont rols
272

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 ormation273
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 for re-testing
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 Park
(automatic transmission). Increase
the engine speed to 2,000 rpm and
hold it there until the temperature
gauge rises to at least 1/4 of the
scale (approximately 3 minutes).
T esting of Readiness Codes
St at e Emissions T est ing
T echnical Inf ormation274

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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:
282
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days of delivery. On returns, a restocking fee may be applied against the original order.

BatteryCharging System ...........................
Indicator .60, 252
............................
Jump Starting .248
..............................
Maintenance .235
............................
Specif ications .267
..............................
Bef ore Driving .167
....................................
Belts,Seat .8,20
.........................
Beverage Holders .106
..................................
Booster Seats .51
Brakes ...........
Anti-lock System (ABS) . 190
.............
Break-in, New Linings . 168....................
Bulb Replacement .223
...........................................
Fluid .218
.......................................
Parking .103
.................
System Indicator . 60,254
........................
Wear Indicators .189
.............................
Braking System .189
.................
Break-in, New Vehicle . 168
..
Brightness Control, Instruments . 72
........................
Brights, Headlights .71
Bulb Replacement ..........................
Back-up Lights .224
..............................
Brake Lights .223
................
Front Parking Lights . 222
........
Front Side Marker Lights . 222
.................................
Headlights .220
.........
High-mount Brake Light . 225
Bulb Replacement .........................
Rear Bulbs .223, 224
............................
Specif ications .267
....................
Turn Signal Lights . 222
..............................
Bulbs, Halogen .220
....................................
Accessories .174
ACCESSORY (Ignition Key .......................................
Position) .77
............
Accessory Power Sockets . 109
....................
Additives, Engine Oil . 212
...............
AdvancedAirbagSystem . 27
...............................
Airbag (SRS) .9, 24
..............
Air Conditioning System . 116
.....................
Rear A/C Control .123
.................................
Usage .119, 121
.......................
Air Outlets (Vents) .118
.......................
Air Pressure, Tires .230
.......................
Alcohol in Gasoline .168
..........................................
Antenna .227
......................................
Antif reeze .214
Anti-lock Brakes (ABS) ...............................
Indicator .61, 190
...................................
Operation .190
..............
Anti-thef t, Audio System . 144
.
Anti-thef t Steering Column Lock . 77
..........................................
Armrests .92
...............
Audio Controls, Remote . 143
................................
Audio System .126
...
Automatic Seat Belt Tensioners . 22 ...
Automatic Lighting Off Feature . 72
.............
Automatic Speed Control . 160
..............
Automatic Transmission . 184
..........................
Capacity, Fluid .266
...............
Checking Fluid Level . 216
.......................................
Shif ting .184
Shif t Lever Position ...............................
Indicators .184
................
Shif t Lever Positions . 185
....................
Shif t Lock Release . 186
CONT INUED
Index
A
B
I

CONT INUED
..............
Def rosting the Windows . 120
....................................
Dimensions .266
...............
Dimming the Headlights . 71
Dipstick ..........
Automatic Transmission . 216
..................................
Engine Oil .171
..........................
Directional Signals .71
........
Disc Brake Wear Indicators . 189
.....................
Disposal of Used Oil .213
Doors ..............
Locking and Unlocking . 78
....................
Lockout Prevention . 78
.................
Manual Sliding Doors . 84
..............................
Monitor Light .63
......................
Power Door Locks .78
...................
Power Sliding Doors . 84
..........
DOT Tire Quality Grading . 268
...........
Driver and Passenger Safety . 5
...........................................
Driving .181
....................................
Economy .173
..................
Dust and Pollen Filter . 227
....................
DVD Error Message .155
...................................
DVD Player .145 ..............................
Economy, Fuel .173
..................................
Emergencies .237
.............
Battery, Jump Starting . 248
...........
Brake System Indicator . 254
................
Changing a Flat Tire . 239
.....
Charging System Indicator . 252
..................
Checking the Fuses . 257
.........
Hazard Warning Flashers . 73
............................
Jump Starting .248
.....
Low Oil Pressure Indicator . 252
...
Malf unction Indicator Lamp . 253
..................
Overheated Engine . 250
.......................................
Towing .255
.........................
Emergency Brake .103
......................
Emergency Flashers .73
......................
Emergency Towing .255
.......................
Emissions Controls .271
.............
Emissions Testing, State . 274
Engine ....
Coolant Temperature Gauge . 67
..............
Engine Speed Limiter . 186
.........................
If It Won’t Start .247
Malf unction Indicator ................................
Lamp .60, 253 ........
Oil Pressure Indicator . 60,252
..............
Oil, What Kind to Use . 211
...............................
Overheating .250
............................
Specif ications .267
.......................................
Starting .183
.
Evaporative Emissions Controls . 271
...............................
Exhaust Fumes .54
Exhaust Gas Recirculation ........................................
System .272
Expectant Mothers, Use of Seat ........................................
Belts by .18
...................................
Fan, Interior .117
Features, Comfort and ..............................
Convenience .115
....................
Filling the Fuel Tank . 169
Filters .........................
Dust and Pollen .227
...............................................
Oil .212
.............
Flashers, Hazard Warning . 73
...................
Flat Tire, Changing a . 239
.....................................
Floor Mats .226
Index
E
F
III

Fluids..........
Automatic Transmission . 216
..........................................
Brake .218
..........................
Power Steering .219
................
Windshield Washers . 216
FM Stereo Radio ...................................
Reception .130
...................
Folding the Third Seat . 96
..........................
Four-way Flashers .73
..............................
Front Airbags .9 ,25
........................................
Front Seat .88
......................................
Adjusting .88
.........................................
Heaters .98
.....................................
Airbags .9, 25
.................................................
Fuel .168
......................
Fill Door and Cap .169
...........................................
Gauge .66
................
Octane Requirement . 168
....................................
Ref ueling .169
........................
Reserve Indicator .64
.....................
Fuses, Checking the .260
.............
Halogen Headlight Bulbs . 220
..............
Hazard Warning Flashers . 73
........................................
Headlights .71
........................................
Aiming .220
..............
Automatic Lighting Off . 72 ............
Daytime Running Lights . 72
..................
High Beam Indicator . 64
.........................
Reminder Chime .71
........
Replacing Halogen Bulbs . 220
...................................
Turning on .71
...................................
Headphones .156
..............................
Head Restraints .92
...............................
Heated Mirror .103
.....................................
Heater, Seat .98
.....................
Heating and Cooling .116
.............
High Altitude, Starting at . 183
.................
High-Low Beam Switch . 71
HomeLink Universal ................................
Transceiver .163
....................................
Hood Latch .220
.......................
Hood, Opening the .170
..............................................
Horn .3,68
...............
Gas Mileage, Improving . 173.........................................
Gasoline .168
...............
Fuel Reserve Indicator . 64
...........................................
Gauge .66
................
Octane Requirement . 168
....................................
Ref ueling .169
................
Gas Station Procedures . 169
Gauges ...
Engine Coolant Temperature . 67
...............................................
Fuel .66
...............................
Speedometer .66
.................................
Tachometer .66
GAWR (Gross Axle Weight .......................................
Rating) .195
GCWR (Gross Combined Weight .......................................
Rating) .195
......................................
Glove Box .109
GVWR (Gross Vehicle Weight .......................................
Rating) .195
...
Identif ication Number, Vehicle . 264
Ignition ..............................................
Keys .75
...........................................
Switch .77
............
Timing Control System . 272
........................
Immobilizer System .76
Index
H I
G
IV

..................................
Maintenance .201
...
Owner Maintenance Checks . 204
.................................
Record .207-209
......................
Required Indicator .65
..........................................
Saf ety .202
.............................
Schedule .203-206
.
Malf unction Indicator Lamp . 60,253
.....................
Manual Sliding Doors .84
...............................
Meters, Gauges .66
........................
Mirrors, Adjusting .102
.................................
Modif ications .175
.
Additional Safety Precautions . 175
...............
Modif ying Your Vehicle . 175
Moving the Second Row Bucket ...............................................
Seat .94
...................
Neutral Gear Position . 185
..................
New Vehicle Break-in . 168
...................
NOTICE, Explanation of . i
...............
Numbers, Identif ication . 264 ...
Octane Requirement, Gasoline . 168
.........................................
Odometer .66
...............................
Odometer, Trip .67
Oil ........................
Change, How to .212
......................
Change, When to .205
......................
Checking Engine .171
..............
Pressure Indicator . 60,252
Selecting Proper Viscosity ......................................
Chart .211
...........
ON (Ignition Key Position) . 77
Onboard Ref ueling Vapor ....................................
Recovery .271
............................
Outside Mirrors .102
....................
Overheating, Engine .250
.......
Owner Maintenance Checks . 204
.........................
Oxygenated Fuels .168
..............
Panel Brightness Control . 72
........................
Park Gear Position .185
...........................................
Parking .188
...............................
Parking Brake .103 Parking Brake and Brake
.................
System Indicator . 60,254
.................................
Parking Lights .71
..
Parking Over Things that Burn . 188
....
Passenger Airbag Of f Indicator . 32
.............................
PGM-FI System .272
..........................
Power Door Locks .78
Power Sliding Doors .................................
Indicator .62, 87
.....................................
Operation .84
.......................................
Switches .85
...............
Power Socket Locations . 104
..............................
Power Windows .99
.........
Pregnancy, Using Seat Belts . 18
.........
Protecting Adults and Teens . 11
...
Additional Safety Precautions . 18
.....
Advice f or Pregnant Women . 18
........................
Protecting Children .35
.......................
Protecting Inf ants .40
.......
Protecting Larger Children . 50
.........
Protecting Small Children . 41
Using Child Seats with .....................................
Tethers .48
.............................
Using LATCH .44
Index
M
N O
P
VI