2004 HONDA PILOT ignition

If the 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,
continued operation may cause
serious damage.
If you have recently ref ueled your
vehicle, the cause of this indicator
coming on could be a loose or
missing f uel f ill cap. Check the cap
or replace it. Tightening the cap will
not make the indicator turn of f
immediately; it takes at least three
days of normal driving.
If the indicator remains on or the
f uel cap was not loose or missing,
have the vehicle checked by the
dealer as soon as possible. If the malf unction indicator lamp
comes on along with the ‘‘D’’
indicator, there is a problem in the
automatic transmission control
system.
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 information (see page ).
226
Malf unction Indicator L amp
Readiness Code
Malf unction Indicator
T aking Care of t he Unexpect ed207
NOTICE:If you keep driving with the
Malf unction Indicator Lamp on, you
can damage your vehicle’s emission
controls and the engine. Those repairs
may not be covered by your vehicle’s
warranties.

If something electrical in your
vehicle stops working, the first thing
youshouldcheckforisablownfuse.
Determine f rom the chart on pagesand , or the diagram on the
fuse box lid, which fuse or fuses
control that device. The diagram f or
theinteriordriver’ssidefuseboxis
on the kick panel below the f use box.
Check those f uses f irst, 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.
Turn the ignition switch to LOCK
(0). Make sure the headlights and
all other accessories are off.
Remove the cover f rom the f use
box. Check each of the large f uses in
the primary under-hood f use box
by looking through the top at the
wise inside. Remove the screws
with a Phillips-head screwdriver.
Check the smaller f uses in the
under-hood f use box and all the
fuses in the interior fuse boxes by
pulling out each f use with the f use
puller provided in the primary
under-hood f use box.
Look f or a burned wire inside the
f use. If it is burned, replace it with
one of the spare f uses of the same
rating or lower.
1.
2. 3.
4.
5.
212 213
Checking and Replacing Fuses
T aking Care of t he Unexpect ed
Fuses
210
BLOWN BLOWN

Thediagramsinthissectiongive
you the dimensions and capacities of
your Honda, and the locations of the
identif ication numbers. It also
includes inf ormation you should
know about your vehicle’s tires and
emissions control systems.................
Identif ication Numbers . 216
................................
Specif ications .218
..........
DOT Tire Quality Grading . 220
Unif orm Tire Quality ..................................
Grading .220
.................................
Treadwear .220
......................................
Traction .220
.............................
Temperature .221 .......................
Emissions Controls .223
.....................
The Clean Air Act .223
Crankcase Emissions Control ....................................
System .223
Evaporative Emissions Control ....................................
System .223
Onboard Ref ueling Vapor ................................
Recovery .223
...
Exhaust Emissions Controls . 224
....................
PGM-FI System .224
Ignition Timing Control ................................
System .224
Exhaust Gas Recirculation ...................
(EGR) System . 224
Three Way Catalytic ...........................
Converter .224
....................
Replacement Parts . 224
..
Three Way Catalytic Converter . 225
..............
State Emissions Testing . 226
....
Testing of Readiness Codes . 226
T echnical Inf ormat ion
T echnical Inf ormation215

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.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.
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. 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
Exhaust Emissions Controls Replacement Parts
PGM-FI Syst emT hree Way Cat alyt ic Convert er
Ignit ion T iming Cont rol Syst em
Exhaust Gas Recirculat ion (EGR)Syst em
Emissions Cont rols
T echnical Inf ormation224

CONT INUED
BatteryCharging System ...........................
Indicator .48, 206
............................
Jump Starting .202
..............................
Maintenance .193
............................
Specif ications .219
..............................
Bef ore Driving .123
....................................
Belts,Seat .8,16
...........................
Beverage Holders .77
..................................
Booster Seats .39 Brakes
...........
Anti-lock System (ABS) . 145
.............
Break-in, New Linings . 124
...........................................
Fluid .178
....................
Bulb Replacement .182
.........................................
Parking .75
.................
System Indicator . 49,208
........................
Wear Indicators .145
.............................
Braking System .144
.................
Break-in, New Vehicle . 124
..
Brightness Control, Instruments . 59
........................
Brights, Headlights .58
Bulb Replacement ..............................
Brake Lights .182
................
Front Parking Lights . 181
........
Front Side Marker Lights . 183
.................................
Headlights .180
........
High-mount Brake Lights . 182
.................................
Rear Bulbs .182
............................
Specif ications .219
.............
Turn Signal Light . 181,182
..............................
Bulbs, Halogen .180
...
Accessories and Modif ications . 129
ACCESSORY (Ignition Key .......................................
Position) .64
..............
Accessory Power Sockets . 77
....................
Additives, Engine Oil . 172
...............................
Airbag (SRS) .9, 19
.....
Airbags, Additional Infomation . 19
...
Additional Safety Precautions . 24
.............................
Airbag Service .24
How the Side Airbag Of f ......................
Indicator Works .23
..
How the SRS Indicator Works . 23
How Your Front Airbags .........................................
Work .20
...
How Your Side Airbags Work . 22
........................
SRS Components .19
................
Air Conditioning System . 82
.......................
Rear A/C Control .87
.......................
Air Pressure, Tires .188
......................................
Antif reeze .174
Anti-lock Brakes (ABS) ....................
Indicator Light .49, 146
...................................
Operation .145
..............
Anti-thef t, Audio System . 102 .
Anti-thef t Steering Column Lock . 64
..................................
Audio System .88
...
Automatic Seat Belt Tensioners . 18
...
Automatic Lighting Off Feature . 58
.............
Automatic Speed Control . 116
..............
Automatic Transmission . 138
..........................
Capacity, Fluid .218
...............
Checking Fluid Level . 176
.......................................
Shif ting .138
.
Shif t Lever Position Indicator . 138
................
Shif t Lever Positions . 139
....................
Shif t Lock Release . 141
Index
A
B
I

.................................................
Fuel .124
......................
Fill Door and Cap .125
...........................................
Gauge .54
................
Octane Requirement . 124
........................
Reserve Indicator .51
........................
Tank, Filling the .125
.....................
Fuses, Checking the .210
...............
Gas Mileage, Improving . 128
.........................................
Gasoline .124
...............
Fuel Reserve Indicator . 51
...........................................
Gauge .54
................
Octane Requirement . 124
........................
Tank, Filling the .125
................
Gas Station Procedures . 125
Gauges ...
Engine Coolant Temperature . 55
...............................................
Fuel .54
GAWR (Gross Axle Weight .......................................
Rating) .148
GCWR (Gross Combined Weight .......................................
Rating) .148
............
Gearshif t Lever Positions . 139
........................................
Glove Box .78 GVWR (Gross Vehicle Weight
.......................................
Rating) .148
.............
Halogen Headlight Bulbs . 180
.................
Hazard Warning Button . 59
........................................
Headlights .58
........................................
Aiming .180
..............
Automatic Lighting Off . 58
............
Daytime Running Lights . 59
..................
High Beam Indicator . 51
...........
High Beams, Turning on . 58
............
Low Beams, Turning on . 58
.........................
Reminder Chime .58
........
Replacing Halogen Bulbs . 180
...................................
Turning on .58
...................................
Headphones .113
..............................
Head Restraints .72
.................................
Heated Mirror .74
.....................................
Heater, Seat .67
.......................
Heating and Cooling .82
.............
High Altitude, Starting at . 137
.................
High-Low Beam Switch . 58
..............
High-mount Brake Light . 182HomeLink Universal
................................
Transceiver .118
.......................
Hood, Opening the .126
..................................................
Horn .56
...
Identif ication Number, Vehicle . 216
Ignition ..............................................
Keys .62
...........................................
Switch .64
............
Timing Control System . 224
........................
Immobilizer System .62
.........
Important Safety Precautions . 6
Indicators .......................
A/T Temperature .52
...............
ABS (Anti-lock Brake) . 49
Brake (Parking and Brake ....................................
System) .49
.................................
Brake Lamp .50
........................
Charging System .48
.............................
Cruise Control .51
DRL (Daytime Running ......................................
Lights) .51
...................................
High Beam .51
........
Key (Immobilizer System) . 49
Index
G H
I
IV

..................................................
Keys .62
......................................
Low Fuel .51
........................
Low Oil Pressure .48
...........................
Side Airbag Of f .48
...............................................
SRS .48
Turn Signal and Hazard ...................................
Warning .50
..........................................
VTM- 4 .52
..............................
Washer Level .51
.........
Indicators, Instrument Panel . 47
.........................
Inf ant Restraint .26, 29
................................
Inf ant Seats .26, 29
...................
Inf lation, Proper Tire . 188
...................................
Inside Mirror .74
.............................
Inspection, Tire .189
........................
Instrument Panel .2 ,46
........
Instrument Panel Brightness . 59
........................................
Introduction . i
.................
Jacking up the Vehicle . 198
.......................................
Jack, Tire .197
................................
Jump Starting .202 .......................
Label, Certif ication .216
.................
Lane Change, Signaling . 58
..................
Lap/Shoulder Belts . 12,17
...........
LATCH Anchorage System . 33
.................................................
Light .79
.............................................
Lights .180
....................
Bulb Replacement .180
.......................................
Indicator .47
.........................................
Parking .58
..................................
Turn Signal .58
....................................
Load Limits .132
......
LOCK (Ignition Key Position) . 64
Locks .......
Anti-thef t Steering Column . 64
............................
Fuel Fill Door .125
....................................
Glove Box .78
....................
Lockout Prevention . 65
.................................
Power Door .65
........................
Low Coolant Level .127
.........................
Low Fuel Indicator .51 ...
Low Oil Pressure Indicator . 48,206
.................................
Lower Anchor .33
...
Lubricant Specif ications Chart . 218
..............
Luggage, .131
...................
Neutral Gear Position . 139
..................
New Vehicle Break-in . 124
...................
NOTICE, Explanation of . i
...............
Numbers, Identif ication . 216
..................................
Maintenance .159
Owner’s Maintenance ...................................
Checks .163
.................................
Record .167-169
......................
Required Indicator .53
..........................................
Saf ety .160
.............................
Schedule .164-166
.
Malf unction Indicator Lamp . 48,207
..............
Manual Seat Adjustments . 69
...............................
Meters, Gauges .54
.................................
Modif ications .130
CONT INUED
Storing (Cargo)
Index
J K
L
M
N
V

...
Octane Requirement, Gasoline . 124
.........................................
Odometer .54
...............................
Odometer, Trip .54
....................
Of f -Highway Driving . 155
...................
Of f -Road Precautions . 155
Oil ........................
Change, How to .172
..............
Change, When to . 164,165
......................
Checking Engine .127
..............
Pressure Indicator . 48,206
Selecting Proper Viscosity ......................................
Chart .171
...........
ON (Ignition Key Position) . 64
Onboard Ref ueling Vapor ................................
Recovery .223
..............................
Outside Mirrors .74
....................
Overheating, Engine .204
....
Owner’s Maintenance Checks . 163 ...................
Radiator Overheating . 204
Radio/CD Sound ..........................................
System .88
..........................
Readiness Codes .226
.................................
Rear A/C Unit .87
............
Rear Audio Control Panel . 107
........
Rear Entertainment System . 104
..
Rear Lights, Bulb Replacement . 182
............................
Rear View Mirror .74
.................
Rear Window Def ogger . 60
.
Rear Window Wiper and Washer . 57
.........
Reclining the Seat Backs . 68,69
...........
Reclining the Second Seats . 70
................
Reclining the Third Seat . 71
.............................
Reminder Lights .47
................
Remote Audio Controls . 101
.................
Remote Control (RES) . 109
.......................
Remote Transmitter .66
Replacement Inf ormation ..............
Dust and Pollen Filter . 185
................
Engine Oil and Filter . 172
.................................
Floor Mats .185
..........................................
Fuses .210
................................
Light Bulbs .180
..............
Panel Brightness Control . 59
........................
Park Gear Position .139 ...........................................
Parking .143
.................................
Parking Brake .75
Parking Brake and Brake System ...............................
Indicator .49, 208
.................................
Parking Lights .58
..
Parking Over Things that Burn . 225
............................
Playing the Radio .88
....................................
Playing a CD .93
....................
Playing a CD Changer . 94
.................................
Playing a Tape .98
.............................
PGM-FI System .224
..........................
Power Door Locks .65
................
Power Seat Adjustments . 68
.................
Power Socket Locations . 76
..............................
Power Windows .73
.........
Pregnancy, Using Seat Belts . 15
.........
Protecting Adults and Teens . 10
...
Additional Safety Precautions . 16
.....
Advice f or Pregnant Women . 15
........................
Protecting Children .25
.....................
General Guidelines .25
...........................
Protecting Inf ants .29
...........
Protecting Larger Children . 38
.............
Protecting Small Children . 30
Index
O
P R
VI