1994 Lexus LS400 maintenance schedule

MAINTENANCE
179
Explanation of scheduled maintenance items
ENGINE COMPONENTS AND EMISSION CONTROL
SYSTEMS
Timing belt
(Applicable to Schedule A only.) When scheduled, replace the
belt and inspect the ignition timing. A qualified technician
should perform these operations.
Valve clearance
Adjust the valve clearances to factory specifications. A
qualified technician should perform this operation.
Drive belt
Inspect the drive belt for cracks, excessive wear or oiliness.
Replace the belt if damaged. Check the auto tensioner
operation.
Engine oil and oil filter
Change the engine oil and oil filter when scheduled. Use API
SG or SH, Energy − Conserving II multigrade engine oil or
ILSAC multigrade engine oil. For recommended viscosity, see
page 199. A qualified technician should perform this operation.Engine coolant
Drain and flush the cooling system when scheduled. Refill only
with an ethylene-glycol type coolant. A qualified technician
should perform this operation.
Exhaust pipes and mountings
Visually inspect the exhaust pipes, muffler and hangers for
cracks, deterioration, or damage. Start the engine and listen
carefully for any exhaust gas leakage. Tighten connections or
replace parts as necessary.
Air cleaner filter
Replace the air cleaner filter when scheduled. Do-it-yourself
instructions are given on page 201. If you mainly operate your
vehicle on dusty roads, additionally inspect and clean the air
cleaner filter when scheduled. Visually check for dirt or
damage. It may be cleaned with compressed air.
Fuel lines and connections
Visually inspect the lines, connections for corrosion, damage,
cracks, and loose or leaking connections. Tighten connections
or replace parts as necessary.
Fuel tank cap gasket
Make sure the new gasket is correctly installed.

MAINTENANCE
180Spark plugs
Install new plugs of the same type as originally equipped. A
qualified technician should perform this operation.
Charcoal canister
Inspect for internal damage or clogging. Clean with
compressed air or replace if necessary. A qualified technician
should perform this operation.
CHASSIS AND BODY
Brake linings and drums
Check for scoring, burning, leaking fluid, broken parts, and
excessive wear. A qualified technician should perform this
operation.
Brake pads and discs
Check the pads for excessive wear and discs for runout and
wear, and leaking fluid. A qualified technician should perform
this operation,
Brake fluid
Check for correct levels of the brake fluid. If the level is low, add
FMVSS No. 116 DOT 3 or SAE J1703 brake fluid to the brake
reservoir. Change the brake fluid as scheduled. A qualified
technician should perform these operations.Brake line pipes and hoses
Visually check for proper installation. Check for chafing,
cracks, deterioration, and any evidence of leaking. Replace
any deteriorated or damaged parts immediately. A qualified
technician should perform these operations.
Steering linkage
With the vehicle stopped, check for excessive freeplay in the
steering wheel. Check the linkage for bend or damage.
Replace any damaged parts.
Steering gear box
Inspect the steering gear box for signs of leakage. Should you
discover any leakage, have the cause found and
corrected / repaired by a qualified technician immediately.
Ball joints and dust covers
Check the suspension and steering linkage ball joints for
looseness or damage. Check all dust covers for deterioration
or damage. A qualified technician should perform these
operations.

MAINTENANCE
181 Automatic transmission fluid
Inspect for signs of leakage. Should you discover any leakage,
have the cause found and corrected / repaired by a qualified
technician immediately. Under severe driving conditions,
change the fluid and oil when scheduled.
Differential oil
Inspect the differential gear housing for signs of leakage.
Should you discover any leakage, have the cause found and
corrected / repaired by a qualified technician immediately.
When scheduled, drain and change the oil.
SRS
This should be periodically inspected by a qualified technician.
For details, see the maintenance schedule.
Bolts and nuts on chassis and body
Where necessary, retighten to specified torque.
Body inspection (paint, corrosion)
Visually check for corrosion, scratches and other damage.
Check body outer panels, underneath the vehicle, inner panels
of the hood and doors, etc. Apply touch-up paint to any chips
or scratches, or have them repaired by a qualified technician.
Air conditioning filter
Check the air flow quantity. Have the filter replaced by your
Lexus dealer according to the maintenance schedule.ROAD TEST
While driving the vehicle, check the proper operation of engine,
transmission, brakes and steering, and check for abnormal
noise or vibration from any part of the vehicle.