engine overheat lexus LS400 1995 Electrical Components / 1995 LS400: STARTING AND DRIVING

STARTING AND DRIVING
126
THREE−WAY CATALYTIC
CONVERTER
Three−way catalytic converters are emission control
devices installed in the exhaust system.
The three−way catalytic converter located at the confluence of
exhaust pipes looks somewhat like a muffler, but its purpose
is to reduce pollutants in the exhaust gas.
CAUTION

Keep people and combustible materials away from
the exhaust pipe while the engine is running. The
exhaust gas is very hot.

Do not drive, idle or park your vehicle over anything
that might burn easily such as grass, leaves, paper or
rags.
NOTICE
A large amount of unburned gases flowing into the
three−way catalytic converter may cause it to overheat
and create a fire hazard. To prevent this and other
damage, observe the following precautions:

Use only unleaded gasoline.

Do not drive with an extremely low fuel level; running
out of fuel could cause the engine to misfire, creating
an excessive load on the three−way catalytic
converter.

Do not allow the engine to run at idle speed for more
than 20 minutes.

Avoid racing the engine.

Do not push−start or pull−start your vehicle.

Do not turn off the ignition while the vehicle is
moving.

Keep your engine in good running order.
Malfunctions in the engine electrical system,
electronic ignition system / distributor ignition
system or fuel system could cause an extremely high
three−way catalytic converter temperature.

If the engine becomes difficult to start or stalls
frequently, take your vehicle in for a check−up as
soon as possible. Remember, your Lexus dealer
knows your vehicle and its three−way catalytic
converter system best.

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130
HOW TO START THE ENGINE
Before cranking
1. Apply the parking brake firmly.
2. Turn off unnecessary lights and accessories.
3. Put the selector lever in “P”. If you need to restart the engine
while the vehicle is moving, put the selector lever in “N”. A
starter safety device will prevent the starter from operating if
the selector lever is in any drive position.
4. Depress the brake pedal and hold it to the floor until you are
ready to drive off.
Starting the engine
Before starting the engine, be sure to follow the instructions in
“Before cranking”.
Normal starting procedure
The multiport fuel injection system / sequential multiport fuel
injection system in your engine automatically controls the
proper air−fuel mixture for starting. You can start a cold or hot
engine as follows:
1. With your foot off the accelerator pedal, crank the engine by
turning the key to “START”. Release it when the engine starts.
2. After the engine runs for about 10 seconds, you are ready
to drive.If the weather is below freezing, let the engine warm up for a
few minutes before driving. Do not leave the vehicle while the
engine is warming up.
If the engine stalls ...
Simply restart it, using the correct procedure given in normal
starting.
If the engine will not start
See “If your vehicle will not start” on page 160.
NOTICE

Do not crank for more than 15 seconds at a time. This
may overheat the starter and wiring systems.

Do not race a cold engine.

If the engine becomes difficult to start or stalls
frequently, have the engine checked immediately.

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134
(b) Using engine braking
To use the braking power of the engine, downshift the
transmission in the way described below:
1
Shift into the “3” position. The transmission will downshift
to the third gear.
2
Shift into the “2” position. The transmission will downshift
to the second gear when the vehicle speed is or becomes
lower than 134 km / h (83 mph) and more powerful engine
braking will be obtained.
3
Shift into the “L” position. The transmission will downshift
to the first gear when the vehicle speed is or becomes
lower than 73 km / h (45 mph) and maximum engine
braking will be applied.
CAUTION
Be careful when downshifting on a slippery surface. The
abrupt change in engine speed could cause the vehicle
to spin or skid.
NOTICE

Be careful not to overrev the engine. Watch the
tachometer to keep engine rpm from going into the
red zone. The approximate maximum allowable
speed for each position is given below for your
reference:
“2”... 134 km / h (83 mph)
“L”... 73 km / h (45 mph)

Do not continue hill climbing or hard towing for a long
time in the “2” or “L” position. This may cause severe
automatic transmission damage from overheating.
To prevent such damage, “3” position should be
used in hill climbing or hard towing.

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136
(e) Good driving practice

If the transmission repeatedly upshifts and downshifts
between the third and overdrive gears when climbing a
gentle slope, shift the selector lever to the “3” position. Be
sure to shift the selector lever to the “D” position after
climbing the slope.

When towing a trailer, in order to maintain efficient engine
braking and electrical charging performance, do not use
overdrive. The selector lever must be in the “3” position.
CAUTION
Always keep your foot on the brake pedal while stopped
with the engine running. This prevents the vehicle from
creeping.
NOTICE
Do not hold the vehicle on an upgrade with the
accelerator pedal. This can cause the transmission to
overheat. Always use the brake pedal or parking brake.
(f) If you cannot shift the selector lever
If you cannot shift the selector ever even though the brake
pedal is depressed, use the shift lock override button. For
instructions, see “If you cannot shift automatic transmission
selector lever” on page 175.
(g) If the “ECT PWR” indicator light flashes
If the “ECI PWR” indicator light flashes, contact your Lexus
dealer as soon as possible. There may be trouble in the
transmission system.
CRUISE CONTROL
The cruise control allows you to cruise the vehicle at a
desired speed over 40 km / h (25 mph) with your foot off the
accelerator pedal.
Your cruising speed can be maintained although a slight speed
change may occur when driving up or down a gradient, within
the limits of engine performance. On steeper hills, a great
speed change will occur so it is better to drive without the cruise
control.
When the cruse control is on, the driving pattern of the
automatic transmission is fixed in the normal position,
regardless of the position of the selector switch.