1999 LEXUS SC300 check engine

ENGINE
347
Oil identification marks
Either or both API registered marks are added to some oil
containers to help you select the oil you should use.

The API Service Symbol is located anywhere on the
outside of the container.
The top portion of the label shows the oil quality by API
(American Petroleum Institute) designation such as SJ.
The center portion of the label shows the SAE viscosity
grade such as SAE 5W±30. ºEner gy±Conservingº, shown
in the lower portion, indicates that the oil has fuel±saving
capabilities.

The ILSAC (International Lubricant Standardization and
Approval Committee) Certification Mark is displayed on
the front of the container.CHECKING THE ENGINE
COOLANT LEVEL

ENGINE
348
Look at the see±through coolant reservoir when the
engine is cold. The coolant level is satisfactory if it is
between theºFULLº and ºLOWº lines on the reservoir.
If the level is low, add ethylene±glycol type coolant for a
proper corrosion protection of aluminum components.
The coolant level in the reservoir will vary with engine
temperature. However, if the level is on or below the ºLOWº
line, add coolant. Bring the level up to the ºFULLº line.
Always use ethylene±glycol type coolant for a proper
corrosion protection of aluminum components. See
information in the next column.If the coolant level drops within a short time after
replenishing, there may be a leak in the system. Visually
check the radiator, hoses, engine coolant filler cap, radiator
cap and drain cock and water pump.
If you can find no leak, have your Lexus dealer test the cap
pressure and check for leaks in the cooling system.
CAUTION
To prevent burning yourself, do not remove the radiator cap
when the engine is hot.

ENGINE
349
Coolant type selection
Use of improper coolants may damage your engine cooling
system. Your coolant must contain ethylene±glycol type
coolant for a proper corrosion protection of your engine that
contains aluminum components. Use ºToyota Long Life
Coolantº or equivalent.
In addition to preventing freezing and subsequent damage to
the engine, this type of coolant will also prevent corrosion.
Further supplemental inhibitors or additives are neither
needed nor recommended.
Read the coolant container for information on freeze
protection. Follow the manufacturer's directions for how
much to mix with plain water (preferably demineralized
water or distilled water). The total capacity of the cooling
system is given on page 331.
We recommend to use 50% solution for your Lexus, to
provide protection down to about ±35C (±31F). When it is
extremely cold, to provide protection down to about ±50 C
(±58 F), 60% solution is recommended. Do not use more
than 70% solution for better coolant performance.
NOTICE
Do not use alcohol type antifreeze or plain water alone.
CHECKING THE ENGINE FAN FLUID (SC400 ONLY)
Park the vehicle at a level spot and look at the see±thr ough
reservoir. If necessary, add automatic transmission fluid
DEXRON
 II or III.

CHASSIS
362If the vehicle has been driven around 80 km/h (50 mph) for
20 minutes (a little more in frigid temperatures), the fluid is
hot (60C ± 80C or 140F ± 175F). You may also check
the level when the fluid is cold (about room temperature,
10 C ± 30C or 50F ± 85 F) if the engine has not been run
for about five hours.
1. Clean all dirt off the reservoir.
2. Remove the filler cap by turning it counterclockwise and
wipe the dipstick clean.
3. Reinstall the filler cap.
4. Remove the filler cap again and look at the fluid level. If
the fluid is cold, the level should be in the ºCOLDº range on
the dipstick. Similarly, if it is hot, the fluid level should be in
the ºHOTº range. If the level is at the low side of either range,
add automatic transmission fluid DEXRON
II or III to bring
the level within the range. 5. After replacing the filler cap, visually check the steering
box case, vane pump and hose connections for leaks or
damage.

ELECTRICAL COMPONENTS
382
Check the battery for corroded or loose connections,
cracks, or loose hold±down clamps.
1. If the battery is corroded, wash it off with a solution of
warm water and baking soda. Coat the terminals with grease
to prevent further corrosion.
2. If the connections are loose, tighten the clamp bolts ±but
do not overtighten.
3. Tighten the hold±down clamp only enough to keep the
battery firmly in place. Overtightening may damage the
battery case.NOTICE

Make sure the engine and all accessories are turned
off before performing maintenance.

When checking the battery, remove the ground cable
first and reinstall it last.

Be careful not to cause a short circuit with tools.

Take care no solution gets into the battery when
washing it.

ELECTRICAL COMPONENTS
388
NOTICE
Never recharge the battery while the engine is running.
Also, make sure all accessories are turned off.
CHECKING AND REPLACINGTHE BLADE TYPE FUSES

ELECTRICAL COMPONENTS
396
ADDING WASHER FLUID
If the washer tank becomes nearly empty, add washer
fluid.
You may use plain water as washer fluid. However, in cold
areas where temperatures range below the freezing point, use
washer fluid containing antifreeze. This product is available
at your Lexus dealer and most auto parts stores. Follow the
manufacturer 's directions for how much to mix with water.
NOTICE
Do not use engine antifreeze or any other substitute
because it may damage your vehicle's paint.
CHECKING THE HEADLIGHTAIM
(For low beam only)