2000 BMW 540I SEDAN engine overheat

22n

Indicator and warning lampsTechnology that monitors itselfMany of the systems of your BMW mon-
itor themselves automatically, both dur-
ing engine starts and while you are driv-
ing. Indicator and warning lamps that
are identified by "l" are tested for
proper functioning whenever the igni-
tion key is turned. They each light up
once for different periods of time.
If a fault should occur in one of these
systems, the corresponding lamp does
not go out after the engine is started or
it lights up while the vehicle is moving.
You will see how to react to this below.
Red: Stop immediately
Battery charge current l
The battery is no longer being
charged. There is a malfunction
of the alternator V-belt or in the charg-
ing circuit of the alternator. Please con-
tact the nearest BMW center.
If the ribbed V-belt is defective, do
not continue driving. The engine
could be damaged due to overheating.
If the ribbed V-belt is defective, in-
creased steering effort is also re-
quired.<
Engine oil pressure l
Comes on while the engine is
running and the "STOP! ENGINE
OILPRESS" message appears in the
Check Control: Stop vehicle and switch
off engine immediately. Check level of
oil in engine, top up as required. If oil
level is correct: Please contact the
nearest BMW center.
Do not continue driving. The en-
gine could be damaged because
of inadequate lubrication.<
Tire Pressure Control (RDC)
* l
In addition, there is an acousti-
cal warning signal: A tire failure
has occurred. Reduce vehicle speed
immediately and stop the vehicle. Avoid
hard brake applications. Do not over-
steer. For additional information: Refer
to page 92.
Parking brake
*, brake hydraulic
system l
Comes on when you engage the
parking brake. For additional informa-
tion: Refer to page 69.
Comes on although the parking brake is
released: Have the brake fluid level
checked. Before driving further, be
sure to read the notes on pages 130
and 152.
Also comes on with the message
"CHECK BRAKE PADS" in the Check
Control.
Parking brake warning lamp
*/
Brake hydraulic system for
Canadian models.

84n
Temperature gauge Service Interval DisplayBlueThe engine is still cold. Drive at moder-
ate engine and vehicle speeds.RedWhen you switch on the ignition, the
warning lamp comes on briefly to con-
firm that the system is operational.
Comes on while driving: The engine is
overheated. Switch the engine off im-
mediately and allow it to cool down.390de007
Between the blue and red zonesNormal operating range. It is not un-
usual for the needle to rise as far as the
edge of the red zone in response to
high outside temperatures or severe
operating conditions.
Checking coolant level: Refer to
page 151.
The precise layout varies according to
the individual model version.
Green lampsThe number of illuminated lamps de-
creases as the time for your next main-
tenance visit approaches.Yellow lampThis field appears together with
OILSERVICE or INSPECTION.
Maintenance is due. Please contact
your BMW center for an appointment.Red lampThe maintenance deadline has been
passed.390us702

86n
Check Control>RELEASE PARKINGBRAKE
>COOLANT TEMPERATURE
The coolant is overheated. Stop the
vehicle and switch off the engine im-
mediately. Refer to pages 84
and 15 1.
>STOP! ENGINE OILPRESS
The oil pressure is too low. Stop the
vehicle and switch off the engine im-
mediately. Refer to page 22.
>CHECK BRAKE FLUID
Indicates that brake fluid is down to
roughly minimum level. Top up the
brake fluid at the next opportunity.
Refer to page 152. Have the source
of the brake fluid loss diagnosed and
corrected by your BMW center.
>FLAT TIRE
*
Reduce vehicle speed immediately
and stop the vehicle. Avoid hard
brake applications. Do not oversteer.
Refer to page 93.
>LOAD LEVEL INACTIVE
Please consult the nearest authorized
BMW center. Refer to page 132.
>SPEED LIMIT
*
Display if the programmed speed
limit has been exceeded.Priority 2
These displays appear for 20 seconds
when the ignition key is turned to posi-
tion 2. The warning symbols remain
after the message disappears. You can
display the messages again by pressing
the CHECK button (3):
>TRUNKLID OPEN
Message appears only when the
vehicle is initially set in motion.
>DOOR OPEN
This message appears after a minimal
defined road speed has been ex-
ceeded.
>FASTEN SEAT BELTS
*
In addition to this message, a
warning lamp with the safety belt icon
appears and an acoustical signal
sounds.
>WASHER FLUID LOW
Too low; top up fluid at the next
opportunity. Refer to page 148.
>CHECK ENGINE OIL LEV
Add engine oil as soon as possible.
Refer to page 149.
>OUTSIDE TEMP. +207 (Ð56)
This display is only an example. The
current temperature is displayed at
outside temperatures of +37.57
(+36) and below. Refer also to
page 82.>TIRE PRESSURE SET
*
The RDC has imported the current in-
flation pressure in the tires as the tar-
get values which the system will
monitor.
Refer to page 92.
>CHECK TIRE PRESSURE
*
Check and correct the tire inflation
pressure to specifications at the earli-
est opportunity (next stop for fuel).
Refer to page 92.
>TIRE CHECK INACTIVE
*
A temporary interference of the RDC
or a system fault. Refer to page 93.
>CHECK BRAKE LAMPS
A lamp has failed or the electrical cir-
cuit has a fault. Refer to pages 169
and 170 or consult an authorized
BMW center.
>CHECK LOWBEAM LAMPS
CHECK SIDE LAMPS
CHECK REAR LAMPS
CHECK FRONT FOGLAMPS
CHECK LICPLATE LAMP
CHECK HIGHBEAM LAMP
CHECK BACK UP LAMPS
Defective bulb or circuit. Refer to
page 167 or consult an authorized
BMW center.

126n
Catalytic converterThe catalytic converter reduces harmful
exhaust emissions, and is designed for
use with unleaded fuel only.
Even minute quantities of lead would be
enough to permanently damage both
the catalytic converter and the system
oxygen sensor.
To ensure efficient, trouble-free engine
operation and avoid potential damage:
>Be sure to comply with the scheduled
maintenance requirements
>Fill the fuel tank well before it is
empty
>Tow-start the vehicle only when the
engine is cold, since unburned fuel
may otherwise reach the catalytic
converter. It is better to start the vehi-
cle with an outside starting aid>Avoid other situations in which the
fuel is not burned, or burns incom-
pletely, such as engaging the starter
frequently or for extended periods, or
repeated start attempts in which the
engine does not start (stopping and
restarting an engine which is running
properly does not present a problem).
Never let the engine run with any of
the spark plug cables disconnected.Be sure to comply with the in-
structions above to prevent un-
burned fuel from reaching the catalytic
converter. Otherwise there is danger of
overheating and damage to the cata-
lytic converter.
Extreme temperatures occur at the cat-
alytic converter on this and every cata-
lyst-equipped vehicle. Heat shields are
installed adjacent to some sections of
the exhaust system. Never remove
these shields; do not apply undercoat-
ing to their surfaces. When driving,
standing at idle, and parking the vehi-
cle, take care to avoid contact between
the exhaust system and flammable ma-
terials (grass, hay, leaves, etc.). Such
contact could lead to a fire, resulting in
personal injury and property damage.<

129n
RepairsIndexOverview Controls Car care Technology Data
Disc brakesDriving notesWhen driving in wet conditions and in
heavy rain, it is a good idea to apply
light pressure to the brake pedal every
few miles (kilometers). Watch traffic
conditions to ensure that this maneuver
does not endanger other road users.
The heat which is generated by the
brake applications helps to dry the
brake pads and rotors.
Maximum braking force is obtained
while the wheels continue to rotate,
peaking when the wheels remain on the
verge of locking without actually doing
so. ABS maintains this state automati-
cally. If the ABS fails, you should revert
to the staggered braking technique de-
scribed below (refer to page 131).
Extended or steep mountain descents
do not necessarily have to lead to re-
duced braking efficiency. Shift down to
a gear in which only minimal periodic
brake applications are required or move
the selector lever to the appropriate
lower range with automatic transmis-
sion.
You can increase the engine's braking
effect by selecting progressively lower
gears, downshifting as far as 1st gear,
or the 1st or 2nd shift position, on steep
descents.Should engine braking prove inade-
quate, you should still avoid extended,
continuous braking. Instead of main-
taining low to moderate pressure over
an extended period of time, you should
decelerate by applying more substantial
pressure to the brake pedal (watch for
following traffic!), then releasing the
pedal, then repeating the application.
This staggered braking technique al-
lows the brakes to cool in the intervals
between active braking phases, pre-
venting overheating and ensuring that
full braking capacity remains available
at all times.
Do not coast with the clutch de-
pressed or with the transmission
or selector lever in neutral. Do not coast
with the engine shut off. The engine
provides no braking effect when the
clutch is depressed or the transmission
is in neutral, and there is no power-as-
sist for braking or steering when the
engine is not running.
Never allow floor mats, carpets or any
other objects to protrude into the area
around the accelerator, clutch and
brake pedals and obstruct their move-
ment.<
Dynamic Brake Control (DBC)
*
If you apply the brakes rapidly, this sys-
tem automatically produces the maxi-
mum braking force boost and thus
helps to achieve the shortest possible
braking distance during "panic stops."
All of the benefits of the ABS system
are exploited under these circum-
stances.
Do not reduce the pressure on the
brake pedal for the duration of the
brake application. When the brake
pedal is released, the DBC is deacti-
vated.
In the event of a malfunction, the yellow
warning lamp comes on. Conventional
braking efficiency is available without
limitations.
Have the system checked and repaired
at your BMW center as soon as possi-
ble.
For "Information for your safety"
covering the ABS system, refer to
page 128. This information also gener-
ally applies for DBC.<