engine BMW Z3 2002 User Guide

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IndexDataTechnologyRepairsMaintenanceControlsOverview
Electronic vehicle immobilizerThe key to securityThe electronic vehicle immobilization
unit increases the anti-theft protection
of your BMW Ð you do not have to
adjust or activate anything. This elec-
tronic immobilization system is
designed to reduce the susceptibility of
the vehicle to theft by making it impos-
sible to start the engine using any
means other than the special keys
furnished with the vehicle.
Your BMW center can cancel the elec-
tronic system authorization for indi-
vidual keys (in the event a key is lost,
for instance). A deactivated key can no
longer be used to start the engine.
How the electronics workAt the heart of this system is an elec-
tronic chip which is integrated into the
key. The lock mechanism itself is actu-
ally a dual-function device, simulta-
neously serving as a communications
interface designed to allow the security
system to maintain a continuous stream
of variable, vehicle-specific signals with
the electronic circuitry in the key. The
system will not release the ignition, fuel
injection and starter unless it recog-
nizes an "authorized" key.
Force applied to the key can
damage the integrated electronic
circuitry. A damaged key can no longer
be used to start the engine.<

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Power convertible top, roadster
*
Weather protectionThe convertible top combines reliable
protection from the elements with
simple, convenient operation. Here are
a few tips to ensure that you have plea-
sure with your roadster.
It is advisable to close the convertible
top when the vehicle is parked. The
closed convertible top not only protects
the passenger compartment from
unforeseeable damage from the
weather, it also provides a certain
degree of theft protection. In addition,
keep valuables only in the locked
luggage compartment, even with the
convertible top closed.
Never mount a roof-mounted luggage
rack on the convertible top. Please
contact your BMW center for suitable
securing devices and additional acces-
sories.
To prevent damage, do not operate the
convertible top at temperatures at the
freezing point.
To conserve the battery, it is advisable
to operate the top only with the engine
running.Operate the convertible top only
when the vehicle is stationary.
Do not lay objects on the convertible
top, since they would fall off when the
convertible top is operated and cause
damage or injuries.
Do not reach into the convertible top
mechanism during opening and closing.
Keep children away from the moving
parts of the convertible top during
operation.
The automatic sequence is interrupted
immediately if the button for actuating
the top (pages 45 and 48) is released.
The sequence can be continued in the
desired direction by pressing the
button.<
To open 1. With the doors closed, lower the side
windows a few inches (centimeters)
2. To release the convertible top: pull
the levers outward on the left and the
right of the frame of the top (refer to
the illustration)367de046

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0 Steering lockedThis is the only position in which the
ignition key can be inserted and
removed.
An acoustic warning sounds when you
fail to remove the ignition key after
opening the driver's door.
After removing the key, turn the
steering wheel slightly to the left or right
until the lock engages.367de009
Vehicles with automatic transmis-
sion
*:
Your vehicle is equipped with an inter-
lock. This means that the ignition key
cannot be turned to position 0 and
removed until the selector lever is in
position "P".
Furthermore, the selector lever is
locked in position "P" when the ignition
key is in position 0 or removed from the
ignition lock.
To turn the key back to position 0 or to
remove it, first move the selector lever
to position "P".<
1 Steering unlockedYou will often find that it is easier to turn
the ignition key from position 0 to 1 if
you move the steering wheel slightly to
help disengage the detent.
Individual electrical equipment and
accessories are available for use.2 Ignition onAll electrical equipment and accesso-
ries are available for use.3 Starting the engineVehicles with manual transmission:
When starting, depress the clutch,
since a lock otherwise prevents the
engine from being started.
Ignition lock

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IndexDataTechnologyRepairsMaintenanceControlsOverview
Starting the engineBefore starting>Engage the parking brake
>Be sure that the gearshift lever is in
"Neutral" (or the selector lever in "P"
if the vehicle is equipped with auto-
matic transmission)
>Depress the clutch pedal.
Do not run the engine in enclosed
spaces. The exhaust gases
contain carbon monoxide, an odorless
and colorless, but highly toxic gas.
Breathing the exhaust gases poses an
extreme health risk, and can lead to
unconsciousness and death.
Do not leave the vehicle unattended
with the engine running. An unattended
vehicle with a running engine repre-
sents a potential safety hazard.<
Starting the engine>Do not press the accelerator pedal
while starting the engine.
Do not actuate the starter for too
short a time. Do not turn it for
more than approx. 20 seconds. Release
the ignition key immediately after the
engine starts.
Do not allow the engine to warm up
by leaving it running while the vehicle
remains stationary. Instead, begin to
drive immediately at a moderate engine
speed.<
Should the engine fail to start on the
first attempt (if it is very hot or cold, for
instance):
>Press the accelerator pedal halfway
down while engaging the starter.
Cold starts at very low temperatures,
from approx. +5 7 (Ð15 6) and at
altitudes above approx. 3,300 ft
(1,000 m):
>On the first start attempt, engage the
starter for a longer period (approx.
10 seconds).
If these temperature conditions are
anticipated for a longer period, have the
engine oil changed to a special oil, refer
to page 124. Please contact your BMW
center for additional information.
Usually, it is not necessary to depress
the accelerator pedal. However, at high
altitudes or in very hot or very cold
weather, depress the pedal halfway
down when starting the engine.
Engine idle speed is controlled by the
engine computer system. Increased
speeds at start-up are normal and
should decrease as the engine warms
up. If engine speed does not decrease,
service is required.
To prevent the battery from
discharging, always switch off any
accessories which are not required.
Switch off the ignition when the vehicle
is not being driven.

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Switching off the engine Parking brakeTurn the ignition key to position 1 or 0.
Do not remove the ignition key
while the vehicle is rolling. The
steering locks and it is impossible to
steer the vehicle.
Always remove the ignition key and
engage the steering lock before leaving
the vehicle.
Vehicles with manual transmission:
Always engage the parking brake when
parking on slopes and inclined
surfaces, since even placing the gear-
shift lever in 1st gear or reverse may not
provide adequate resistance to rolling.
Vehicles with automatic transmission:
Place the selector lever in "P".<
The parking brake is designed primarily
to prevent the vehicle from rolling when
parked. It operates against the rear
wheels.To engageThe lever engages automatically when
you pull it up, and the indicator lamp in
the instrument panel comes on when
the ignition key is in position 2, refer to
page 21.To releasePull up slightly on the lever, press the
button and lower the lever.367de028
If, in exceptional circumstances,
it should be necessary to engage
the parking brake while the vehicle is
in motion, do not pull it with excessive
pressure. Keep your thumb pressed
against the release button while care-
fully pulling up the lever to apply
moderate pressure.
Excessive pressure can lead to over-
braking and loss of traction at the rear
(fishtailing).
The brake lamps do not come on when
the parking brake is engaged.
Vehicles with manual transmission:
Always engage the parking brake when
parking on slopes and inclined
surfaces, since even placing the gear-
shift lever in 1st gear or reverse may not
provide adequate resistance to rolling.
Vehicles with automatic transmission:
Place the selector lever in "P".<
To avoid corrosion and one-sided
braking, apply the parking brake lightly
from time to time when coasting to a
standstill (at a traffic signal, for
instance), provided that it is safe to do
so.

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IndexDataTechnologyRepairsMaintenanceControlsOverview
Manual transmissionPress the clutch pedal all the way down
each time you shift, pressing the gear-
shift lever into its proper end position.
Depress the clutch when starting the
vehicle, too, otherwise, lockout will
prevent the engine from starting.
The gearshift lever's neutral plane is
located between 3rd and 4th gear.
When shifting from each gear into
"Neutral", the gearshift lever returns
automatically to this neutral position
because of its spring loading.367de353
ReverseSelect reverse only when the vehicle is
stationary. Press the gearshift lever to
the left to overcome the resistance.
As you do this, the backup lamps will
turn on automatically when the ignition
key is in position 2.
Do not hold the vehicle in place on
slopes by slipping or "riding" the
clutch. Use the parking brake instead,
otherwise, the ensuing friction to the
clutch plates will cause a great deal of
wear and tear on the clutch.<

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Automatic transmission with Steptronic
*
You can drive as with a normal auto-
matic transmission. In addition, you can
also shift manually.
When you move the selector lever from
the "D" position to the left into the M/S
range, the performance-oriented shift
programs of the automatic transmission
are engaged. As soon as you briefly tab
the selector lever in the "+" or "Ð" direc-
tion, Steptronic changes the gear. The
manual mode is engaged. When you
wish to use the automatic transmission
mode again, move the selector lever to
the right into the "D" position.
The automatic transmission of your
BMW is equipped with Adaptive Trans-
mission Control (ATC), a system which
reacts with precision to your individual
driving style and the driving conditions.
To achieve this, different shift programs
are automatically engaged.
For additional details concerning the
ATC, please refer to the chapter
"Advanced technology" on page 164.
Selector lever positions
P R N D M/S + Ð
Starting the engine The engine can only be started in
selector lever positions P ("Park") or
N ("Neutral"). Range selection A detent prevents inadvertent shifts to
the "Reverse" or "Park" selector lever
positions. To disengage the detent,
press the button on the front side of
the selector lever knob (arrow). 367de703
While the vehicle is stationary and
before shifting out of "Park" or
"Neutral", depress the footbrake in
order to disengage the selector lever's
lock mechanism (Shiftlock).
Hold the footbrake down until starting
off. The vehicle will otherwise "creep"
when a drive position is engaged.<
If you leave the vehicle with the
engine running, move the selector
lever to the "Park" or "Neutral" position
and apply the parking brake. If you fail
to do this, the vehicle could move.
Do not leave the vehicle unattended
with the engine running. An unattended
vehicle with a running engine repre-
sents a potential safety hazard.<

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IndexDataTechnologyRepairsMaintenanceControlsOverview
Automatic transmission with Steptronic
*
P Ñ Park Select only when the vehicle is
stationary. The transmission locks to
prevent the rear wheels from turning.R Ñ Reverse Select only when the vehicle is
stationary. N Ñ Neutral Select only if your journey is interrupted
for a longer period. D Ñ Drive
(automatic shift program) This position is designed for driving
under all normal operating conditions.
All forward gears are available. Kickdown In the kickdown mode, you achieve
maximum performance and in
position D, you reach maximum speed.
Depress the accelerator pedal past the
increased resistance point at the full-
throttle position.
M/S Ð manual mode and
Sport Program When you change from D to M/S, the
Sport Program is activated. This is
indicated by "S" in the gear selection
display. The M/S mode is recom-
mended for performance-oriented
driving.
With the first brief touch, the automatic
transmission shifts from the Sport
Program to the manual mode. When
you tab the selector lever in the "+"
direction, the transmission shifts up.
When the lever is tabbed in the
"Ð" direction, the transmission shifts
down. M1 to M5 is indicated in the
transmission range display.
Upshifts or downshifts will only be
carried out by the ATC at appropriate
engine speeds and road speeds. If the 367de704
engine speed is too high, for instance,
the downshift will not be executed. The
gear selected will appear briefly in the
instrument cluster followed by the
current gear.
If you are driving in the manual
mode and wish to accelerate
rapidly Ð to pass another vehicle, for
example Ð shift down manually or with
the "Kickdown" function.<
You can only change from M/S to
selector lever positions "P", "R" and "N"
via the "D" position.
In the following situations, the Steptronic
"thinks" for you in the manual mode:
>In order to prevent engine over-
speeding, the transmission shifts
automatically to the next higher gear
shortly before the engine speed
cutoff point
>At low speeds, the transmission
shifts down automatically Ð you do
not have to act
>In the kickdown mode, the transmis-
sion shifts down to the lowest possible
gear based on the engine speed
>Depending on the situation Ð when
driving in adverse winter conditions,
for example Ð the transmission may
also start out in 2nd or 3rd gear.

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Automatic transmission with Steptronic
*
Turn signals/High beams
Available displays
S M1 M2 M3 M4 M5
Electronic transmission control
module
If the indicator lamp comes on
there is a fault in the transmis-
sion system.
All of the selector lever positions can
continue to be used; in the forward
drive positions, however, the vehicle
will be operating with restricted gear
availability.
If this happens, avoid extreme engine
loads and consult the nearest BMW
center.
367us723
Do not work in the engine
compartment when a drive gear
(forward or reverse) is engaged. If you
do so, the vehicle could move.<
Information on jump-starting, tow-
starting and towing, refer to
pages 158, 159.
1 High beams (blue indicator lamp)
2 Headlamp flasher (blue indicator
lamp)
3 Turn signal indicators (green indicator
lamp and rhythmic clicking of the
relay)
If the indicator lamp and the clicking
from the relay are both faster than
normal, one of the turn signal indicators
has failed.To signal brieflyPress the lever up to but not beyond
the pressure point. It then returns to the
center position when released.367us024

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IndexDataTechnologyRepairsMaintenanceControlsOverview
Cruise control
*
You can maintain and store any desired
vehicle speed above approx. 25 mph
(40 km/h).
The system is switched off and the
stored speed deleted from its memory
when you turn the ignition key to posi-
tion 0.
Do not use the cruise control on
winding roads, when high traffic
density prevents driving at a constant
speed, when the road surface is slick
(snow, rain, ice) or when the road
surface is loose (rocks or gravel,
sand).< 365us059
To maintain and store speed/
to acceleratePress the lever briefly in direction 1:
The system maintains and stores the
current vehicle speed. Every time you
briefly press the lever, the speed
increases by approx. 0.6 mph (1 km/h).
Hold the lever in position 1:
The vehicle accelerates without pres-
sure on the accelerator pedal. When
you release the lever, the system main-
tains and stores the current speed.
If, on a downhill grade, the engine
braking effect is not sufficient, the
controlled speed can be exceeded.
Speed can drop on uphill grades if the
engine output is insufficient.< To deceleratePress the lever briefly in direction 2:
If you are already driving with active
cruise control, the speed is decreased
by approx. 0.6 mph (1 km/h) every time
you briefly touch the lever.
Hold the lever in position 2:
With the cruise control active, the
system automatically reduces the
throttle opening to slow the vehicle.
When you release the lever, the system
maintains and stores the current speed.Call up stored setting (resume)Press the lever briefly in direction 3:
The vehicle accelerates to and main-
tains the last speed stored.To deactivatePress the lever briefly in direction 4:
The cruise control is deactivated imme-
diately.
In addition, the system is also automati-
cally deactivated in response to the
following conditions:
>When you apply the brakes
>When you depress the clutch or move
the automatic transmission selector
lever from "D" to "N"
>If you exceed or fall below the preset
speed for an extended period (by
depressing the accelerator, for
example).