2003 Acura MDX catalytic converter

This meter shows the number of
miles (U.S.) or kilometers (Canada)
driven since you last reset it.
There are two trip meters: Trip A
and Trip B. Switch between these
displays by pressing the Select
button repeatedly. Each trip meter
works independently, so you can
keep track of two dif f erent distances.
When you turn the ignition switch
ON (II), what you last selected isdisplayed.
To reset a trip meter, display it, and
then press and hold the Reset button
until the number resets to ‘‘0.0’’.
Both trip meters will reset if the
vehicle’s battery goes dead or is
disconnected.
This shows the temperature of the
engine’s coolant. During normal
operation, the pointer should rise
from the bottom blue mark to about
the middle of the gauge. In severe
driving conditions, such as very hot
weather or a long period of uphill
driving, the pointer may rise to the
upper white mark. If it reaches the
red (Hot) mark, pull saf ely to the
side of the road. Turn to page f or
instructions and precautions on
checking the engine’s cooling
system.
This shows how much f uel you have.
It is most accurate when the vehicle
is on level ground. It may show
slightly more or less than the actual
amount when you are driving on
curvy or hilly roads.
The needle returns to the bottom
after you turn off the ignition. The
gauge shows the f uel level reading
immediately af ter you turn the
ignition switch back ON (II).
371
Trip Meter
Temperature GaugeFuel Gauge
Gauges
Inst rument s and Cont rols75
SELECT BUTTON
RESET BUTTON
Avoid driving with an extremely low
f uel level. Running out of f uel could
cause the engine to misf ire, damaging
the catalytic converter.

µ
Always use the parking brake when
you park your vehicle. The indicator
on the instrument panel shows that
the parking brake is not f ully
released; it does not indicate that the
parking brake is f irmly set. Make
sure the parking brake is set f irmly
or your vehicle may roll if it is
parked on an incline.
Set the parking brake bef ore you put
the transmission in Park. This keeps
the vehicle from moving and putting
pressure on the parking mechanism
in the transmission making it
easier to move the shif t lever out of
Park when you want to drive away. If the vehicle is f acing uphill, turn
the f ront wheels away f rom the curb.
If the vehicle is f acing downhill, turn
the f ront wheels toward the curb.
Make sure the parking brake is f ully
released bef ore driving away.
Driving with the parking brake
partially set can overheat or damage
the rear brakes.
Make sure the moonroof and the
windows are closed.
Never park over dry leaves, tall
grass, or other f lammable
materials. The three way catalytic
converter gets very hot, and could
cause these materials to catch on
fire. Lockthedoorswiththekeyorthe
remote transmitter. Place any packages, valuables, etc.,
in the cargo area or take them
with you. Turn of f the lights.
Parking T ips
Parking
Driving261

Thediagramsinthissectiongive
you the dimensions and capacities of
your Acura, 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 . 388
................................
Specif ications .390
..........
DOT Tire Quality Grading . 392
Unif orm Tire Quality ..................................
Grading .392
.................................
Treadwear .392
......................................
Traction .392
.............................
Temperature .393
...........................
Tire Inf ormation .394 .........................
Oxygenated Fuels .395
......
Driving in Foreign Countries . 396
.......................
Emissions Controls .397
.....................
The Clean Air Act .397
Crankcase Emissions Control ....................................
System .397
Evaporative Emissions Control ....................................
System .397
Onboard Ref ueling Vapor ................................
Recovery .397
...
Exhaust Emissions Controls . 398
....................
PGM-FI System .398
Ignition Timing Control ................................
System .398
Exhaust Gas Recirculation ...................
(EGR) System . 398
Three Way Catalytic ...........................
Converter .398
....................
Replacement Parts . 398
..
Three Way Catalytic Converter . 399
T echnical Inf ormat ion
T echnical Inf ormation387

If you are planning to take your
Acura outside the U.S., contact the
tourist bureaus in the areas you will
betravelingintofindoutaboutthe
availability of unleaded gasoline with
theproperoctanerating.
If unleaded gasoline is not available,
be aware that using leaded gasoline
in your Acura will af f ect perf or-
mance and fuel mileage, and damage
its emissions controls. It will no
longer comply with U.S. and
Canadian emissions regulations, and
will be illegal to operate in North
America. To bring your vehicle back
into compliance will require the re-
placement of several components,
such as the oxygen sensors and the
three way catalytic converter. These
replacements are not covered under
warranty.
Driving in Foreign Countries
T echnical Inf ormation396

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 emissions control systems are
covered by warranties separate from
the rest of your vehicle. Read your
warranty manual f or more informa-
tion.
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 operat-
ing 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
Acura replacement parts or their
equivalent f or repairs. Using lower
qualitypartsmayincreasethe
emissions f rom your vehicle.
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
Emissions Cont rols
T echnical Inf ormation398

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.
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. 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 Acura part
or its equivalent.
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 ormation399
THREE WAY CATALYTIC CONVERTERTHREE WAY CATALYTIC CONVERTER

Steering Wheel..................................
Adjustment .89
.............
Anti-theft Column Lock . 92
...
Stereo Sound System . 145,163,183
....................
Storing Your Vehicle .349
........................
Sunglasses Holder .124
........................................
Sun Visor .124
Supplemental Restraint System ......................................
Servicing .61
.........................
SRS Indicator .56 ,68
...................
System Components . 50
..................................
Synthetic Oil .308
.....................
Underside, Cleaning .357
Unexpected, Taking Care ..........................................
of the .359
....
Unif orm Tire Quality Grading . 392
........................
Unleaded Gasoline .236
.....................
Upholstery Cleaning .354
.......
Used Oil, How to Dispose of . 310
................................
Vanity Mirror .125
.................
Vehicle Capacity Load . 246
......................
Vehicle Dimensions .390
....
Vehicle Identif ication Number . 388
.....................................
Tachometer .74
......
Taillights, Changing Bulbs in . 344
.
Taking Care of the Unexpected . 359
...................
Tape Player . 151,177,191
Technical Descriptions ......
DOT Tire Quality Grading . 392
.....
Emissions Control Systems . 397
.....................
Oxygenated Fuels .395
Three Way Catalytic ...............................
Converter .399
.......................
Temperature Gauge .75 ...................
Tensioners, Seat Belts . 48
............................
Thef t Protection .182
..
Three Way Catalytic Converter . 399
....................................
Timing Belt .332
....................................
Tire Chains .338
.........
Tire, How to Change a Flat . 361
...........................
Tire Inf ormation .394
...............................................
Tires .332
..............................
Air Pressure .332
...................................
Balancing .335
.........................
Checking Wear .334
..........................
Compact Spare .360
......
DOT Tire Quality Grading . 392
......................................
Inf lation .332
..................................
Inspection .334
...................................
Replacing .336
......................................
Rotating .335
...........................................
Snow .338
............................
Specif ications .391
................................
Tire Chains .338
Towing .....................................
A Trailer .271
................
Emergency Wrecker . 385
Your Vehicle Behind a ............................
Motorhome .283
.............
Transf er Assembly Fluid . 318Transmission
...............
Checking Fluid Level . 317
...........................
Fluid Selection .317
..............
Identif ication Number . 388
.............
Shif ting the Automatic . 253
.....................................
Treadwear .392
.......................................
Trip Meter .75
....................................
Turn Signals .83
...................
Tools, Tire Changing . 361
Index
T U
V
VIII