engine Acura MDX 2004 Repair Manual

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 ten 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.
GotoanAcuradealeroraservice
station 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.
4.161
205
244
L ow Oil Pressure Indicator
Emergency T owingCharging System Indicator
T aking Care of t he Unexpect ed
L ow Oil Pressure Indicator, Charging System Indicator
242
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 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 (see page ).
If this indicator comes on
while driving, it means one
of the engine’s emissions 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 you have recently ref ueled your
vehicle, the indicator could come on
because of 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 turn of f
immediately; it takes at least three
days of normal driving. If the indicator comes on repeatedly,
even though it may turn of f as you
continue driving, have the vehicle
checked by the dealer as soon as
possible.
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.
262
Malf unction Indicator L amp
T aking Care of t he Unexpect ed
Malf unction Indicator L amp
Readiness Code
243
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.

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 ormation252
VEHICLE IDENTIFICATION NUMBERCERTIFICATION LABEL

The Engine Number is stamped into
the engine block. It is on the f ront.
The Transmission Number is on a
label on top of the transmission.
Identif ication Numbers
T echnical Inf ormation253
ENGINE NUMBERAUTOMATIC TRANSMISSION NUMBER

µµÎ
Î
Î
Î
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Specif ications
T echnical Inf ormation254
Dimensions
Weights
Air ConditioningCapacities
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
)
188.7 in (4,793 mm)
77.0 in (1,955 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)
9,835 lbs (4,461 kg)
HFC-134a (R-134a)
24.7 26.5 oz (700 750 g) ND-OIL8 2.9 US qt (2.7
)
3.0 US qt (2.8)
0.45 US qt (0.43
)
0.48 US qt (0.45)
0.16 US gal (0.6
) 4.8 US qt (4.5
)
Excluding the oil remaining in the engine. Including the coolant in the reserve tank and that remaining in the
engine.
Reserve tank capacity:
Equipped with transmission fluid cooler and power steering fluid
cooler.
Length
Width
Height
Wheelbase
Track
Gross vehicle weight rating
Gross combined weight
rating (GCWR)
See the tire information label atta-
ched to the driver’s doorjamb.
Refrigerant type
Charge quantity
Lubricant type Fuel tank
Engine
coolant
Engine oil
Automatic
transmission
fluid
Rear
differential
fluid
Transfer
assembly
fluid
Windshield
washer
reservoir
The GCWR must be reduced 2 percent for every 1,000 feet (305
meters) of elevation. Approx.
Front
Rear
1:
2:
Standard
Premium
1:
2: Change
Total
Change
Including
filter
Without
filter
Total
Change
Total
Change
Total
Change
Total
2 1 1
2

µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
Specif ications
T echnical Inf ormation255
Battery
Fuses
Engine
Alignment
Tires
Lights
60 W (HB3)
12 V
10.0 : 1
211.8 cu-in (3,471 cm
)
3.50 x 3.66 in (89.0 x 93.0 mm)
12 V 55 W (H11)
3CP
12 V 28/8 W
12 V 51 W (HB4)
12 V 5 W
12 V 21 W
12 V 21 W/5 W
12 V 21 CP (18 W)
12 V 3 CP
12 V 21 W
12 V 5 W
12 V 5 W 5W
5W
1.1 W
3.8 W
12 V
12 V
12 V
12 V
12 V
12 V 20 AH/5 HR
Capacity Interior
Under-hood
Type
BorexStroke
Displacement
Compression ratio
Spark plugs
IZFR5K-11
SKJ16DR-M11
Water cooled 4-stroke SOHC,
V6 gasoline engine
See page
249or the fuse label
attached to the dashboard.
See page 249or the fuse label
attached to the inside of the fuse
box door under the dashboard.
See page 248or the fuse box
cover.
Toe-in
Camber
Caster
Size
Pressure 0.00 in (0.0 mm)
0.00 in (0.0 mm)
0°50’
0°50’
1°53’
P235/65R17 103T
T155/90D16 110M
32 psi (220 kPa , 2.2 kgf/cm
)
60 psi (420 kPa , 4.2 kgf/cm)
Headlights
Front side marker lights
Front turn signal lights/
Parking lights
Fog light
Front foot 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
Front/Rear
Spare
Front/Rear
Spare Front
Rear
Front
Rear
Front
Front
Rear Driver’s side
Passenger’s side
High
Low
NGK:
DENSO:

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.
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.
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 .
199
Emissions Cont rols
The Clean Air Act
Crankcase Emissions Control
System Evaporative Emissions Control
System
Onboard Ref ueling Vapor
Recovery
T echnical Inf ormation259

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
covered by warranties separate from
the rest of your vehicle. Read your
warranty manual f or more informa-
tion. The emissions control systems are
designed and certif ied to work
together 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
Emissions Cont rols
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 ormation260

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.
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 ormation261
THREE WAY CATALYTIC CONVERTER
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. 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).
St at e Emissions T est ing
T esting of Readiness Codes
T echnical Inf ormation262