2004 Acura MDX check engine

Diagnosing why the engine won’t
start f alls into two areas, depending
on what you hear when you turn the
key to START (III):You hear nothing, or almost
nothing. The engine’s starter
motor does not operate at all, or
operates very slowly.
You can hear the starter motor
operating normally, or the starter
motor sounds like it is spinning
f aster than normal, but the engine
does not start up and run.
When you turn the ignition switch to
START (III), you do not hear the
normal noise of the engine trying to
start. You may hear a clicking sound
or series of clicks, or nothing at all.
Check these things: Check the transmission interlock.
The transmission must be in Park
orNeutralorthestarterwillnot
operate.
Turn the ignition switch to ON (II).
Turn on the headlights, and check
their brightness. If the headlights
are very dim or don’t light at all,
the battery is discharged. See
on page .
Turn the ignition switch to START
(III). If the headlights do not dim,
check the condition of the f uses. If
thefusesareOK,thereis
probably something wrong with
the electrical circuit f or the
ignition switch or starter motor.
You will need a qualif ied
technician to determine the
problem (see
on page ). If the headlights dim noticeably or
go out when you try to start the
engine, either the battery is dis-
charged or the connections are
corroded. Check the condition of
the battery and terminal connec-
tions (see page ). You can
then try jump starting the vehicle
f rom a booster battery (see page
).
In this case, the starter motor’s
speed sounds normal, or even f aster
than normal, when you turn the
ignition switch to START (III), but
the engine does not run. Are you using a properly coded
key? An improperly coded key will
cause the immobilizer system
indicator in the dash panel to blink
rapidly(seepage ).
238
244 226
238
78
CONT INUED
If Your Engine Won’t Start
Nothing Happens or the Starter
Motor Operates Very Slowly Jump Starting
Emergency T owing T he Starter Operates Normally
T aking Care of t he Unexpect ed237

´´
Are you using the proper starting
procedure? Ref er to
on page .
Do you have f uel? Check the f uel
gauge; the warning indicator may
not be working.
There may be an electrical
problem, such as no power to the
f uel pump. Check all the f uses
(see page ).
If youfindnothingwrong,youwill
need a qualif ied technician to f ind
the problem. See on page . Although this seems like a simple
procedure, you should take several
precautions.
To jump start your vehicle:
You cannot start your Acura by
pushing or pulling it. Open the hood, and check the
physical condition of the battery.
In very cold weather, check the
condition of the electrolyte. If it
seems slushy or like ice, do not try
jump starting until it thaws.
Turn of f all the electrical acces-
sories: heater, A/C, climate
control, audio system, lights, etc.
Put the transmission in Neutral or
Park, and set the parking brake.
Connect one jumper cable to the
positive ( ) terminal on your
Acura’s battery. Connect the other
end to the positive ( ) terminal
on the booster battery.
1.
2.
3.
171
246 244 Starting the
Engine
Emergency
Towing Jump Starting
T aking Care of t he Unexpect ed
If the Engine Won’t Start, Jump Starting
238
NOTICE:
A battery can explode if you do
not follow the correct procedure,
seriously injuring anyone
nearby.
Keep all sparks, open flames,
and smoking materials away
from the battery. If a battery sits in extreme
cold, the electrolyte inside can f reeze.
Attempting to jump start with a f rozen
battery can cause it to rupture.

µ
The numbers in the illustration show
you the order to connect the jumper
cables.If the booster battery is in another
vehicle, have an assistant start
that vehicle and run it at a fast idle. Start your vehicle. If the starter
motor still operates slowly, check
that the jumper cables make sure
they have good metal-to-metal
contact.
Once your vehicle is running,
disconnect the negative cable f rom
your vehicle, then f rom the
booster battery. Disconnect the
positive cable f rom your vehicle,
then from the booster battery.
Connect the second jumper cable
to the negative ( ) terminal on
the booster battery. Connect the
other end to the grounding strap
as shown. Do not connect this
jumper cable to any other part of
the engine. Keep the ends of the jumper cables
away from each other and any metal
on the vehicle until everything is
disconnected. Otherwise, you may
cause an electrical short.
5. 7.
4. 6.
Jump Starting
T aking Care of t he Unexpect ed239
BOOSTER BATTERY

If the temperature gauge stays at
the red mark, turn of f the engine.
Look f or any obvious coolant leaks,
such as a split radiator hose.
Everything is still extremely hot,
so use caution. If you f ind a leak, it
must be repaired bef ore you
continue driving (seeon page ). Start the engine and set the
temperature control dial to
maximum (climate control to
FULL AUTO at 90°F/32°C). Add
coolant to the radiator up to the
base of the f iller neck. If you do
not have the proper coolant
mixture available, you can add
plain water. Remember to have
the cooling system drained and
ref illed with the proper mixture as
soon as you can.
Put the radiator cap back on
tightly. Run the engine, and watch
the temperature gauge. If it goes
back to the red mark, the engine
needs repair (see
on page ).
If the temperature stays normal,
check the coolant level in the
radiator reserve tank. If it has
gone down, add coolant to the
MAX mark. Put the cap back on
tightly.
If you don’t f ind an obvious leak,
check the coolant level in the
radiator reserve tank. Add coolant
if the level is below the MIN mark.
If there was no coolant in the
reserve tank, you may need to add
coolant to the radiator. Let the
engine cool down until the pointer
reaches the middle of the tempera-
ture gauge, or lower, bef ore check-
ing the radiator.
Using gloves or large heavy cloth,
turn the radiator cap
counterclockwise, without pushing
down, to the f irst stop. Af ter the
pressure releases, push down on
the cap, and turn it until it comes
off.
4.
5.
6.
7. 8.
10.
11.9.
244 244
If Your Engine Overheats
T aking Care of t he Unexpect ed
Emergency
Towing
Emergency
Towing
241
Removing the radiator cap
while the engine is hot can
cause the coolant to spray out,
seriously scalding you.
Always let the engine and
radiator cool down before
removing the radiator cap.

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.

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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:
270
NOTE: Dealers and Companies please provide dealer or company name,
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days of delivery. On returns, a restocking fee may be applied against the original order.

CONT INUED
...
Accessories and Modif ications . 163
ACCESSORY (Ignition Key .......................................
Position) .79
............
Accessory Power Sockets . 101
....................
Additives, Engine Oil . 206
...............................
Airbag (SRS) .9, 22
..............
Air Conditioning System . 104
.....................
Rear A/C Control .109
.........................................
Usage .105
.......................
Air Outlets (Vents) .106
.......................
Air Pressure, Tires .221
......................................
Antif reeze .208
Anti-lock Brakes (ABS) ....................
Indicator Light .59, 181
...................................
Operation .181
..............
Anti-thef t, Audio System . 129
.
Anti-thef t Steering Column Lock . 79
................
Audio System . 110,115,125
...
Automatic Seat Belt Tensioners . 20
.........................
Automatic Lighting .73
.............
Automatic Speed Control . 144
..............
Automatic Transmission . 172
..........................
Capacity, Fluid .254
...............
Checking Fluid Level . 210.......................................
Shif ting .172
.
Shif t Lever Position Indicator . 172
................
Shif t Lever Positions . 172
....................
Shif t Lock Release . 175
...........................
Automatic Wipers .70
Battery Charging System ...........................
Indicator .58, 242
............................
Jump Starting .238
..............................
Maintenance .226
............................
Specif ications .255
..............................
Bef ore Driving .157
....................................
Belts,Seat .8,19
...........................
Beverage Holders .99
..................................
Booster Seats .48
Brakes ...........
Anti-lock System (ABS) . 181
.............
Break-in, New Linings . 158
...........................................
Fluid .212
....................
Bulb Replacement .216
.........................................
Parking .92
.................
System Indicator . 59,244
........................
Wear Indicators .180 .............................
Braking System .180
.................
Break-in, New Vehicle . 158
..
Brightness Control, Instruments . 74
........................
Brights, Headlights .72
Bulb Replacement ..........................
Back-up Lights .216
..............................
Brake Lights .216
................
Front Parking Lights . 215
........
Front Side Marker Lights . 215
.................................
Headlights .214
.........
High-mount Brake Light . 217
.................................
Rear Bulbs .216
............................
Specif ications .255
....................
Turn Signal Lights . 215
..............................
Bulbs, Halogen .214
Index
A
B
I