2003 Acura MDX engine

If something electrical in your
vehicle stops working, the first thing
youshouldcheckforisablownfuse.
Determine f rom the chart on pagesand , or the diagram on the
f use box lid (the diagram f or the
driver’s side interior f use box is on
the kick panel below the f use box),
which f use or f uses control that
component. Check those f uses f irst,
but check all the f uses bef ore
deciding that a blown f use is not the
cause. Replace any blown f uses and
check the component’s operation.
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.
The secondary f use box is in the
engine compartment next to the
battery.
The primary under-hood f use box is
located in the back of the engine
compartment on the passenger’s side.
To open it, push the tabs as shown.
1.
2. 383 384
Checking and Replacing Fuses
Fuses
T aking Care of t he Unexpect ed380
UNDER-HOOD
UNDER-HOOD

Your vehicle has several identif ying
numbers located in various places.
The Vehicle Identif ication Number
(VIN) is the 17-digit number your
Acura dealer uses to register your
vehicle f or warranty purposes. It is
also necessary f or licensing and
insuring your vehicle. The easiest
placetofindtheVINisonaplate
fastened to the top of the dashboard.
Youcanseeitbylookingthrough
the windshield on the driver’s side. It
is also on the Certification label at-
tached to the driver’s doorjamb, and
is stamped on the engine com-
partment bulkhead. The VIN is also
provided in bar code on the
Certif ication label.
Identif ication Numbers
T echnical Inf ormation388
VEHICLE IDENTIFICATION NUMBERCERTIFICATION LABEL

The Transmission Number is on a
label on top of the transmission. The Engine Number is stamped into
the engine block. It is on the f ront.
Identif ication Numbers
T echnical Inf ormation389
ENGINE NUMBERAUTOMATIC TRANSMISSION NUMBER

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Specif ications
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Dimensions
Air Conditioning Weights
Capacities
Length
Width
Height
Wheelbase
Track
See the tire information label atta-
ched to the driver’s doorjamb. 1.88 US gal (7.1
)
2.38 US gal (9.0)
4.5 US qt (4.3
)
4.2 US qt (4.0
)
5.3 US qt (5.0
)
2.9 US qt (2.7)
7.7 US qt (7.3)
19.21 US gal (72.7
)
188.5 in (4,789 mm)
76.3 in (1,938 mm)
68.7 in (1,744 mm)
71.3 in (1,811 mm)
106.3 in (2,700 mm)
66.3 in (1,685 mm)
66.5 in (1,690 mm)
9,700 lbs (4,400 kg)
Refrigerant type
Charge quantity
Lubricant type HFC-134a (R-134a)
24.7 26.5 oz (700 750 g) ND-OIL8
Gross vehicle weight rating
Gross combined weight
rating (GCWR)
2.9 US qt (2.7
)
3.0 US qt (2.8)
0.45 US qt (0.43
)
0.48 US qt (0.45)
Excluding the oil remaining in the engine. 0.16 US gal (0.6
)
Including the coolant in the reserve tank and that remaining in the
engine.
Reserve tank capacity:
Fuel tank
Engine
coolant
Engine oil
Automatic
transmission
fluid
Rear
differential
fluid
Transfer
assembly
fluid
Windshield
washer
reservoir
4.8 US qt (4.5
)
Approx.
Front
Rear
1:
2:
Standard
Premium
Equipped with transmission fluid cooler and power steering fluid
cooler.
The GCWR must be reduced 2 percent for every 1,000 feet (305
meters) of elevation.
1:
2: Change
Total
Change
Including
filter
Without
filter
Total
Change
Total
Change
Total
Change
Total
2 1 1
2

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Specif ications
T echnical Inf ormation391
Tires Alignment Engine
Fuses
Battery Lights 60 W (HB3)
12 V
Size
Pressure60 psi (420 kPa , 4.2 kgf/cm
)
32 psi (220 kPa , 2.2 kgf/cm)
T155/90D16 110M P235/65R17 103T
Toe-in
Camber
Caster
1°53’0°50’ 0°50’
0.00 in (0.0 mm)
0.00 in (0.0 mm)
Type
BorexStroke
Displacement
Compression ratio
Spark plugs
10.0 : 1
211.8 cu-in (3,471 cm
)
3.50 x 3.66 in (89.0 x 93.0 mm)
Interior
Under-hood
12 V 51 W (HB4)
3CP
12 V 50 CP
12 V 51 W (HB4)
12 V 2 CP (3.8 W)
12 V 24 CP (27 W)
12 V 21 W/5 W
12 V 21 CP (18 W)
12 V 3 CP
12 V 21 W
12 V 6.2 W
12 V 7 W 5W
5W
1.1 W
3.8 W
Capacity 12 V
12 V
12 V
12 V
12 V
12 V 20 AH/5 HR
Water cooled 4-stroke SOHC,
V6 gasoline engine
Headlights
Front side marker lights
Front turn signal lights/
Parking lights
Fog light
Rear side marker lights
Rear turn signal/hazard lights
Brake/Taillights
Backup lights
License plate lights
High-mount brake light
Individual map lights
Cargo area light
Tailgate light
Vanity mirror light
Door light See page
384or the fuse label
attached to the dashboard.
See page 384or the fuse label
attached to the inside of the fuse
box door under the dashboard.
See page 383or the fuse box
cover.
See spark plug maintenance
section page 325 .
Front/Rear
Spare
Front/Rear
Spare Front
Rear
Front
Rear
Front
Front
Rear Driver’s side
Passenger’s side
High
Low

Î
ÎThe burning of gasoline in your
vehicle’s engine produces several by-
products. Some of these are carbon
monoxide (CO), oxides of nitrogen
(NOx) and hydrocarbons (HC).
Gasoline evaporating f rom the tank
also produces hydrocarbons. Con-
trolling the production of NOx, CO,
and HC is important to the environ-
ment. Under certain conditions of
sunlight and climate, NOx and HC
react to f orm photochemical ‘‘smog.’’
Carbon monoxide does not contri-
bute to smog creation, but it is a
poisonous gas. The United States Clean Air Act
sets standards f or automobile
emissions. It also requires that
automobile manufacturers explain to
owners how their emissions controls
workandwhattodotomaintain
them. This section summarizes how
the emissions controls work.
Scheduled maintenance is on page
.
In Canada, Acura vehicles comply
with the Canadian emission
requirements, as specif ied in an
agreement with Environment
Canada, at the time they are
manuf actured.
Your vehicle has a Positive
Crankcase Ventilation System. This
keeps gasses that build up in the
engine’s crankcase f rom going into
the atmosphere. The Positive Crank- case Ventilation valve routes them
from the crankcase back to the
intake manif old. They are then
drawn into the engine and burned.
The Onboard Ref ueling Vapor
Recovery (ORVR) system captures
the f uel vapors during ref ueling. The
vapors are adsorbed in a canister
f illed with activated carbon. While
driving, the f uel vapors are drawn
into the engine and burned of f . As gasoline evaporates in the f uel
tank, an evaporative emissions
control canister f illed with charcoal
adsorbs the vapor. It is stored in this
canister while the engine is of f . Af ter
the engine is started and warmed up,
the vapor is drawn into the engine
and burned during driving.
296
The Clean Air Act
Crankcase Emissions Control
System
Onboard Ref ueling Vapor
Recovery Evaporative Emissions Control
System
Emissions Cont rols
T echnical Inf ormation397

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