レクサス - 自動車 - 1992_LS400-mk-6-3_192 (2023)

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SECTION6–3SERVICE PROCEDURES ANDSPECIFICATIONSChassisSpecifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Checking brake fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Checking brake pedal freeplay . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Checking brake pedal clearance . . . . . . . . . . . . . . . . . . . . . . . . . . .Checking parking brake adjustment . . . . . . . . . . . . . . . . . . . . . . . .Checking the brake booster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Checking power steering fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Checking steering wheel freeplay . . . . . . . . . . . . . . . . . . . . . . . . . .Checking automatic transmission fluid . . . . . . . . . . . . . . . . . . . . . .Checking tire pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Rotating tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Checking and replacing tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Installing snow tires and chains . . . . . . . . . . . . . . . . . . . . . . . . . . . .Replacing wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Aluminum wheel precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .180182182183183183184185185187188188190191192179CHASSISSPECIFICATIONS− AUTOMATIC TRANSMISSIONFluid capacityDry fillDrain and refillFluid type8.2 L (8.7 qt., 7.2 Imp.qt.)1.9 L (2.0 qt., 1.7 Imp.qt.)Automatic transmission fluid Type T-II or equivalent− DIFFERENTIALOil capacityOil typeOil viscosity1.3 L (1 4 qt., 1.1 Imp.qt.)Hypoid gear oil API GL-5Above − 18_C (0_F):SAE90Below − 18_C (0_F):SAE80W or SAE80W-90− BRAKESPedal clearancePedal freeplayBrake pad wear limitParking brake lining wear limitParking brake adjustmentFluid type18080 nm (3.1 in. ) Min.3 − 5 mm (0.12 − 0.20 in.)1.0 mm (0.04 in.)1.0 mm (0.04 in.)5 − 7 clicksSAE J1703 or FMVSS No. 116 DOT 3CHASSIS− STEERINGFreeplayPower steering fluid typeLess than 30 mm (1.2 in.)Automatic transmission fluid DEXRON®II− TIRES AND WHEELSTire size205 / 65R15 94VTire inflation pressureRecommended cold tire inflation pressureVehicle load up to four occupants.Vehicle loaded up to vehicle capacityweight.Wheel sizeWheel nut torqueFront 210 kPa (2.1 kg / cm2 or bar, 30 psi)Rear 210 kPa (2.1 kg / cm2 or bar, 30 psi)Front 210 kPa (2.1 kg / cm2 or bar, 30 psi)Rear 250 kPa (2.5 kg / cm2 or bar, 36 psi)For sustained high speeds above 160 km / h (100 mph), in countrieswhere such speeds are permitted by law, add 49 kPa (0.5 kg/ cm2 or bar,8 psi) to the front tires and 40 kPa (0.4 kg / cm2 or bar, 6 psi) to the reartires, but never exceed the maximum cold tire pressure molded on thetire sidewall.15X6½JJ (UNI-DIRECTIONAL)103 N.m (10.5 kgf.m, 76 ft.lb)181CHASSISCHECKING BRAKE FLUIDReservoir coverCAUTION:Use caution in filling the reservoir because brake fluid canharm your eyes and damage painted surfaces.NOTICE (For vehicles with traction control system only):Idle the engine while pouring brake fluid into thereservoir.CHECKING BRAKE PEDALFREEPLAYTo check the fluid level, simply look at the see-throughreservoir. The level should be between the “MAX” and“MIN” lines on the tank.It is normal for the brake fluid level to go down slightly as thebrake pads wear. So be sure to keep the reservoir filled.0.12 − 0.20 in.(3 − 6 mm)If the reservoir needs frequent refilling, it may indicate aserious mechanical problem.If the level is low, add FMVSS No. 116 DOT 3 or SAE J1703brake fluid to the brake reservoir.Remove and replace the reservoir cover by hand. Add brakefluid up to the dotted line. This brings the fluid to the correctlevel when you put the cover back on.Use only newly opened brake fluid. Once opened, brake fluidabsorbs moisture from the air, and excess moisture can causea dangerous loss of braking.182With the engine stopped, first reduce the vacuum in thebooster by depressing the brake pedal several times.Then lightly and slowly press down on the pedal with yourfingers and measure the distance it moves before slightresistance is felt.If the freeplay is more or less than specification, have yourLexus dealer adjust the brakes.CHASSISCHECKING BRAKE PEDALCLEARANCE80 mm (3.1 in.) min.With the engine running, have someone press the brakepedal several times and then press hard (approximately490 N [50 kgf, 110 lb.]) on it. The distance from the asphaltsheet to the top surface of the pedal should not be lessthan specified.If the clearance is less, your Lexus dealer should adjust thebrakes.CHECKING PARKING BRAKEADJUSTMENT5 − 7 clicksCount the number of clicks as you slowly press down onthe parking brake pedal as far as it will go (approximately294 N [30 kgf, 66.1 lb.]). The adjustment is correct if youhear 5 to 7 clicks.If you count more or less clicks, have the parking brakeadjusted by your Lexus dealer.CHECKING THE BRAKEBOOSTERSit in the driver’s seat and follow the instructions givenbelow. If your brakes do not operate as described, havethem checked at your Lexus dealer.1. With the engine stopped, depress the brake pedal severaltimes: the travel distance should not change.183CHASSIS2. With the brake fully depressed, start the engine: the pedalshould move down a little when the engine starts.3. Depress the brake, stop the engine, and hold the pedal infor about 30 seconds: the pedal should neither sink nor rise.4. Restart the engine, run it for about a minute and turn it off.Then firmly depress the brake several times: the pedal travelshould decrease with each application.If the vehicle has been driven around 80 km/h (50 mph) for 20minutes (a little more in frigid temperatures), the fluid is hot(60_C − 80_C or 140_F − 175_F). You may also check the levelwhen the fluid is cold (about room temperature, 10_C − 30_C or50_F − 85_F) if the engine has not been run for about five hours.CHECKING POWER STEERINGFLUIDIf hot O.K.If cold O.K.If hot addIf cold adda. Clean all dirt from outside of the reservoir tank.b. Remove the filler cap by turning it counterclockwise andwipe the dipstick clean.c. Reinstall the filler cap.Check the fluid level on the dipstick. If necessary, addDEXRON®-II automatic transmission fluid.d. Remove the filler cap again and look at the fluid level. Ifthe fluid is cold, the level should be in the “COLD” range onthe dipstick. Similarly, if it is hot, the fluid level should be in the“HOT” range. If the level is at the low side of either range, addDEXRON®-II automatic transmission fluid to bring the levelwithin the range.e. After replacing the filler cap, visually check the steering boxcase, vane pump and hose connections for leaks or damage.184CHASSISCAUTION:The reservoir tank may be hot so be careful not to burnyourself.NOTICE:D Avoid overfilling, or the power steering could bedamaged.D When adding the power steering fluid, avoid spillingit. The alternator under the power steering reservoircould be damaged if fluid is spilled on it.CHECKING STEERING WHEELFREEPLAY30 mm (1.2 in.)max.CHECKING AUTOMATICTRANSMISSION FLUID1. Check the fluid level only when the transmission is atnormal operating temperature. With the vehicle level, firstset the parking brake and then start the engine. While theengine is idling, depress the brake pedal and shift theselector level into each range from “P” to “L” and returnto “P”.If the vehicle has been driven over 16 km or 10 miles (24 kmor 15 miles in frigid temperatures) and the fluid temperature is70_C − 80_C (160_F − 175_F), the transmission is at normaloperating temperature.You may check the level when the transmission is cold. If thevehicle has not been driven for over five hours and the fluid isabout room temperature 20_C − 30_C (70_F − 85_F), thetransmission is cold.However, checking a cold transmission is to be used for yourreference only and the transmission must be checked again forcorrect level at normal operating temperature.If the vehicle has just been driven for a long time at high speed,in city traffic in hot weather, or the vehicle has been pulling atrailer, an accurate fluid level cannot be obtained. Check thelevel after the fluid has cooled down (about 30 minutes.)With the vehicle stopped and the front wheels pointedstraight ahead, rock the steering wheel gently back andforth. If the freeplay is more than specified, have itinspected by your Lexus dealer.Use only a very light finger pressure to rock the wheel slowly.185CHASSISc. Pull the dipstick out and look at the fluid level. If thetransmission is cold, the level should be in the “COOL” rangeon the dipstick. Similarly, if it is normal operating temperature,the fluid level should be in the “HOT” range. If the level is at thelow side of either range, add automatic transmission fluidtype T-II or equivalent to bring the level within the range. (Fluidis added through the dipstick tube, using a funnel.)Unlock positionLock positiond. While checking the fluid level, also check the condition. Ifthe fluid is black or if it smells burnt, have it changed.e. After checking, return the dipstick to lock position.2. With the engine still idling, check the fluid level andcondition on the dipstick. If necessary, add automatictransmission fluid type T-II or equivalent.CAUTION:When the engine is running, keep hands and clothingaway from the moving fan and the engine drive belt.a. Turn the dipstick lever clockwise to unlock position, pull itout and wipe it clean.NOTICE:Avoid overfilling, or the transmission could bedamaged.b. Fully reinsert the dipstick.If coldO.K.If hotO.K.186If hotaddIf coldaddCHASSISCHECKING TIRE PRESSUREHigh tire pressure produces a harsh ride, handling problems,excessive wear at the center of the tire tread, and a greaterpossibility of tire damage from road hazards.The following instructions for checking tire pressure should beobserved:labelD The pressure should be checked only when the tires arecold. If your vehicle has been parked for at least 3 hours andhas not been driven for more than 1.5 km or 1 mile since, youwill get an accurate cold tire pressure reading.D Always use a tire pressure gauge. The appearance of thetire can be misleading. Besides, tire pressures that are evenjust a few pounds off can degrade handling and ride.The recommended cold tire pressures, tire size and thevehicle capacity weight are given on the label inside theglovebox lid.You should check the tire pressures every two weeks or, atleast once a month. And don’t forget the spare! The pressurefor the spare tire should be 250 kPa (2.5 kg/ cm2 or bar, 36 psi).Incorrect tire pressure can reduce tire life and make yourvehicle less safe to drive.Low tire pressure results in excessive wear, poor handling,reduced fuel economy, and the possibility of blowouts fromoverheated tires. Also, low tire pressure can cause poorsealing of the tire bead. If the tire pressure is excessively low,there is the possibility of wheel deformation and / or tireseparation. So keep your tire pressures at the proper level. Ifa tire frequently needs refilling, have it checked by your Lexusdealer.D Do not bleed or reduce tire pressure after driving. It isnormal for the tire pressure to be higher after driving.D Never exceed the vehicle capacity weight. Thepassengers and luggage weight should be located so thatthe vehicle is balanced.D Be sure to reinstall the tire inflation valve caps. Withoutthe valve caps, dirt or moisture could get into the valve coreand cause air leakage. If the caps have been lost, have newones put on as soon as possible.187CHASSISROTATING TIRESTurning direction indicator (“L” or “R”)CHECKING AND REPLACINGTIRESWhen to replace your tiresTread wear indicatorTo equalize the wear of your tires, rotate the tires every12000 km (7500 miles).The wheel assemblies are of the uni-directional type and mustbe rotated only between the front and rear as illustrated above.When rotating tires, check for uneven wear and damage.Abnormal wear is usually caused by incorrect tire pressure,improper wheel alignment, out-of-balance wheels, or severebraking.Before storing radial, snow or studded tires, mark the directionof rotation and be sure to install them in the same directionwhen replacing. Tires should be stored in a cool dry place.Turning direction indicator means “L” mark is for the lest-sidewheel or “R” mark is for the right-side wheel.188New treadWorn treadReplace the tires when the tread wear indicators show.The tires on your Lexus have built-in tread wear indicators tohelp you know when the tires need replacement. When thetread depth wears to 1.6 mm (0.06 in.) or less, the indicatorswill appear. If you can see the indicators in two or moreadjacent grooves, the tire should be replaced.The effectiveness of snow tires is lost if the tread wearsdown below 4 mm (0.16 in.).CHASSISIf you have tire damage such as cuts, splits, cracks deepenough to expose the fabric, or bulges indicating internaldamage, the tire should be replaced.If a tire often does flat or cannot be properly repaired due to thesize or location of a cut or other damage, it should be replaced.If you are not sure, consult with your Lexus dealer.If an air loss occurs while driving, do not continue driving witha deflated tire. Driving even a short distance can damage a tirebeyond repair.Uniform tire quality gradingThis information has been prepared in accordance withregulations issued by the National Highway Traffic SafetyAdministration of the U.S Department of Transportation.It provides the purchasers and / or prospectivepurchasers of Lexus vehicles with information on uniformtire quality grading.Treadwear − The treadwear grade is a comparative ratingbased on the wear rate of the tire when tested under controlledconditions on a specified government test course. Forexample, a tire graded 150 would wear one and a half (1-1 / 2)times as well on the government course as a tire graded 100.The relative performance of tires depends upon the actualconditions of their use, however, and may depart significantlyfrom the norm due to variations in driving habits, servicepractices and differences in road characteristics and climate.Traction A, B, C − The traction grades, from highest to lowest,are A, B and C, and they represent the tire’s ability to stop onwet pavement as measured under controlled conditions onspecified government test surfaces of asphalt and concrete. Atire marked C may have poor traction performance.Warning: The traction grade assigned to this tire is based onbraking (straight ahead) traction tests and does not includecornering (turning) traction.Your Lexus dealer will help answer any questions you mayhave as you read this information.DOT quality grades − All passenger vehicle tires mustconform to Federal Safety Requirements in addition tothese grades. These quality grades are molded on thesidewall.189CHASSISTemperature A, B, C − The temperature grades are A (thehighest), B, and C, representing the tire’s resistance to thegeneration of heat and its ability to dissipate heat when testedunder controlled conditions on a specified indoor laboratorytest wheel. Sustained high temperature can cause the materialof the tire to degenerate and reduce tire life, and excessivetemperature can lead to sudden tire failure. The grade Ccorresponds to a level of performance which all passenger cartires must meet under the Federal Motor Vehicle SafetyStandard No. 109. Grades B and A represent higher levels ofperformance on the laboratory test wheel than the minimumrequired by law.Warning: The temperature grade of this tire is established fora tire that is properly inflated and not overloaded. Excessivespeed, underinflation, or excessive loading, either separatelyor in combination, can cause heat buildup and possible tirefailure.Tire selectionWhen replacing a tire, use only the same size andconstruction as originally installed and with the same orgreater load capacity.Using any other size or type of tire may seriously affecthandling, ride, speedometer / odometer calibration, groundclearance, and clearance between the body and tires or snowchains.Do not mix radial, belted, or conventional tires on yourvehicle.190It can cause dangerous handling characteristics, resulting inloss of control. If you need to change from conventional tiresto radial tires or vice versa, replace them as a set.INSTALLING SNOW TIRES ANDCHAINSWhen to use snow tires or chainsSnow tires or chains are recommended when driving onsnow or ice.On wet or dry roads, conventional or radial tires provide bettertraction than snow or studded tires.Snow tire selectionIf you need snow tires, select the same size, constructionand load capacity as the original tires on your Lexus.Do not use tires other than stated above. Since your vehiclehas radial tires as original equipment, make sure your snowtires also have radial constructor. Do not install studded tireswithout first checking local regulations for possible restrictions.Snow tire installationSnow tires should be installed on all wheels.Installing snow tires on the rear wheels only can lead to anexcessive difference in road grip capability between the frontand rear tires which could cause loss of vehicle control.CHASSISCAUTION:D Snow tires should be inflated to 30 kPa (0.3 kg / cm2 orbar, 4 psi) above the normal cold tire recommendations,but never above the maximum cold tire pressure shownon the tire sidewall.D Never drive over 120 km / h (75 mph) with any type ofsnow tires.Tire chain selectionREPLACING WHEELSWhen to replace your wheelsIf you have wheel damage such as bends, cracks or heavycorrosion, the wheel should be replaced.If you fail to replace damaged wheels, a tire may slip off a wheelor they may cause loss of handling control.Use SAE Class “S” type radial tire chains except radial cablechains or V-bar type chains.Replacement with used wheels is not recommended as theymay have been subjected to rough treatment or high mileageand could fail without warning. Also, bent wheels which havebeen straightened may have hidden structural damage andtherefore should not be used. Never use an inner tube in aleaking wheel which is designed for a tubeless tire.Chain installationWheel selectionInstall the chains on the rear tires as tightly as possible.Do not use tire chains on the front tires. Retighten chainsafter driving 0.5 − 1.0 km (1 / 4 − 1 / 2 mile).When replacing wheels, care should be taken to ensurethat they are equivalent to those removed in load capacity,diameter, rim width, and offset.When installing chains on your tires, carefully follow theinstructions of the chain manufacturer.Correct replacement wheels are available at your Lexusdealer.CAUTION:D Do not exceed 50 km / h (30 mph) or the chainmanufacturer’s recommended speed limit, whicheveris lower.A wheel of a different size or type may adversely affecthandling, wheel and bearing life, brake cooling,speedometer / odometer calibration, stopping ability, headlightaim, bumper height, vehicle ground clearance, and tire or snowchain clearance to the body and chassis.Regulations regarding the use of tire chains varyaccording to location or type of road. Always check thelocal regulations before installing chains.D Drive carefully avoiding bumps, holes, and sharp turns,which may cause the vehicle to bounce.D Avoid sharp turns or locked-wheel braking, as use ofchains may adversely affect vehicle handling.191CHASSISALUMINUM WHEELPRECAUTIONSD After driving your vehicle the first 1600 km (1000 miles),check that the wheel nuts are tight.D If you have rotated, repaired, or changed your tires, checkthat the wheel nuts are still tight after driving 1600 km (1000miles).D When using tire chains, be careful not to damage thealuminum wheels.D Use Only the Lexus wheel nuts and wrench designed foryour aluminum wheels.D When balancing your wheels, use only Lexus balanceweights or equivalent and a plastic or rubber hammer.D As with any wheel, periodically check your aluminumwheels for damage. If damaged, replace immediately.192

内容の概要

SECTION6–3SERVICE PROCEDURES ANDSPECIFICATIONSChassisSpecifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Checking brake fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Checking brake pedal freeplay . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Checking brake pedal clearance . . . . . . . . . . . . . . . . . . . . . . . . . . .Checking parking brake adjustment . . . . . . . . . . . . . . . . . . . . . . . .Checking the brake booster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Checking power steering fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Checking steering wheel freeplay . . . . . . . . . . . . . . . . . . . . . . . . . .Checking automatic transmission fluid . . . . . . . . . . . . . . . . . . . . . .Checking tire pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Rotating tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Checking and replacing tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Installing snow tires and chains . . . . . . . . . . . . . . . . . . . . . . . . . . . .Replacing wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Aluminum wheel precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .180182182183183183184185185187188188190191192179CHASSISSPECIFICATIONS− AUTOMATIC TRANSMISSIONFluid capacityDry fillDrain and refillFluid type8.2 L (8.7 qt., 7.2 Imp.qt.)1.9 L (2.0 qt., 1.7 Imp.qt.)Automatic transmission fluid Type T-II or equivalent− DIFFERENTIALOil capacityOil typeOil viscosity1.3 L (1 4 qt., 1.1 Imp.qt.)Hypoid gear oil API GL-5Above − 18_C (0_F):SAE90Below − 18_C (0_F):SAE80W or SAE80W-90− BRAKESPedal clearancePedal freeplayBrake pad wear limitParking brake lining wear limitParking brake adjustmentFluid type18080 nm (3.1 in. ) Min.3 − 5 mm (0.12 − 0.20 in.)1.0 mm (0.04 in.)1.0 mm (0.04 in.)5 − 7 clicksSAE J1703 or FMVSS No. 116 DOT 3CHASSIS− STEERINGFreeplayPower steering fluid typeLess than 30 mm (1.2 in.)Automatic transmission fluid DEXRON®II− TIRES AND WHEELSTire size205 / 65R15 94VTire inflation pressureRecommended cold tire inflation pressureVehicle load up to four occupants.Vehicle loaded up to vehicle capacityweight.Wheel sizeWheel nut torqueFront 210 kPa (2.1 kg / cm2 or bar, 30 psi)Rear 210 kPa (2.1 kg / cm2 or bar, 30 psi)Front 210 kPa (2.1 kg / cm2 or bar, 30 psi)Rear 250 kPa (2.5 kg / cm2 or bar, 36 psi)For sustained high speeds above 160 km / h (100 mph), in countrieswhere such speeds are permitted by law, add 49 kPa (0.5 kg/ cm2 or bar,8 psi) to the front tires and 40 kPa (0.4 kg / cm2 or bar, 6 psi) to the reartires, but never exceed the maximum cold tire pressure molded on thetire sidewall.15X6½JJ (UNI-DIRECTIONAL)103 N.m (10.5 kgf.m, 76 ft.lb)181CHASSISCHECKING BRAKE FLUIDReservoir coverCAUTION:Use caution in filling the reservoir because brake fluid canharm your eyes and damage painted surfaces.NOTICE (For vehicles with traction control system only):Idle the engine while pouring brake fluid into thereservoir.CHECKING BRAKE PEDALFREEPLAYTo check the fluid level, simply look at the see-throughreservoir. The level should be between the “MAX” and“MIN” lines on the tank.It is normal for the brake fluid level to go down slightly as thebrake pads wear. So be sure to keep the reservoir filled.0.12 − 0.20 in.(3 − 6 mm)If the reservoir needs frequent refilling, it may indicate aserious mechanical problem.If the level is low, add FMVSS No. 116 DOT 3 or SAE J1703brake fluid to the brake reservoir.Remove and replace the reservoir cover by hand. Add brakefluid up to the dotted line. This brings the fluid to the correctlevel when you put the cover back on.Use only newly opened brake fluid. Once opened, brake fluidabsorbs moisture from the air, and excess moisture can causea dangerous loss of braking.182With the engine stopped, first reduce the vacuum in thebooster by depressing the brake pedal several times.Then lightly and slowly press down on the pedal with yourfingers and measure the distance it moves before slightresistance is felt.If the freeplay is more or less than specification, have yourLexus dealer adjust the brakes.CHASSISCHECKING BRAKE PEDALCLEARANCE80 mm (3.1 in.) min.With the engine running, have someone press the brakepedal several times and then press hard (approximately490 N [50 kgf, 110 lb.]) on it. The distance from the asphaltsheet to the top surface of the pedal should not be lessthan specified.If the clearance is less, your Lexus dealer should adjust thebrakes.CHECKING PARKING BRAKEADJUSTMENT5 − 7 clicksCount the number of clicks as you slowly press down onthe parking brake pedal as far as it will go (approximately294 N [30 kgf, 66.1 lb.]). The adjustment is correct if youhear 5 to 7 clicks.If you count more or less clicks, have the parking brakeadjusted by your Lexus dealer.CHECKING THE BRAKEBOOSTERSit in the driver’s seat and follow the instructions givenbelow. If your brakes do not operate as described, havethem checked at your Lexus dealer.1. With the engine stopped, depress the brake pedal severaltimes: the travel distance should not change.183CHASSIS2. With the brake fully depressed, start the engine: the pedalshould move down a little when the engine starts.3. Depress the brake, stop the engine, and hold the pedal infor about 30 seconds: the pedal should neither sink nor rise.4. Restart the engine, run it for about a minute and turn it off.Then firmly depress the brake several times: the pedal travelshould decrease with each application.If the vehicle has been driven around 80 km/h (50 mph) for 20minutes (a little more in frigid temperatures), the fluid is hot(60_C − 80_C or 140_F − 175_F). You may also check the levelwhen the fluid is cold (about room temperature, 10_C − 30_C or50_F − 85_F) if the engine has not been run for about five hours.CHECKING POWER STEERINGFLUIDIf hot O.K.If cold O.K.If hot addIf cold adda. Clean all dirt from outside of the reservoir tank.b. Remove the filler cap by turning it counterclockwise andwipe the dipstick clean.c. Reinstall the filler cap.Check the fluid level on the dipstick. If necessary, addDEXRON®-II automatic transmission fluid.d. Remove the filler cap again and look at the fluid level. Ifthe fluid is cold, the level should be in the “COLD” range onthe dipstick. Similarly, if it is hot, the fluid level should be in the“HOT” range. If the level is at the low side of either range, addDEXRON®-II automatic transmission fluid to bring the levelwithin the range.e. After replacing the filler cap, visually check the steering boxcase, vane pump and hose connections for leaks or damage.184CHASSISCAUTION:The reservoir tank may be hot so be careful not to burnyourself.NOTICE:D Avoid overfilling, or the power steering could bedamaged.D When adding the power steering fluid, avoid spillingit. The alternator under the power steering reservoircould be damaged if fluid is spilled on it.CHECKING STEERING WHEELFREEPLAY30 mm (1.2 in.)max.CHECKING AUTOMATICTRANSMISSION FLUID1. Check the fluid level only when the transmission is atnormal operating temperature. With the vehicle level, firstset the parking brake and then start the engine. While theengine is idling, depress the brake pedal and shift theselector level into each range from “P” to “L” and returnto “P”.If the vehicle has been driven over 16 km or 10 miles (24 kmor 15 miles in frigid temperatures) and the fluid temperature is70_C − 80_C (160_F − 175_F), the transmission is at normaloperating temperature.You may check the level when the transmission is cold. If thevehicle has not been driven for over five hours and the fluid isabout room temperature 20_C − 30_C (70_F − 85_F), thetransmission is cold.However, checking a cold transmission is to be used for yourreference only and the transmission must be checked again forcorrect level at normal operating temperature.If the vehicle has just been driven for a long time at high speed,in city traffic in hot weather, or the vehicle has been pulling atrailer, an accurate fluid level cannot be obtained. Check thelevel after the fluid has cooled down (about 30 minutes.)With the vehicle stopped and the front wheels pointedstraight ahead, rock the steering wheel gently back andforth. If the freeplay is more than specified, have itinspected by your Lexus dealer.Use only a very light finger pressure to rock the wheel slowly.185CHASSISc. Pull the dipstick out and look at the fluid level. If thetransmission is cold, the level should be in the “COOL” rangeon the dipstick. Similarly, if it is normal operating temperature,the fluid level should be in the “HOT” range. If the level is at thelow side of either range, add automatic transmission fluidtype T-II or equivalent to bring the level within the range. (Fluidis added through the dipstick tube, using a funnel.)Unlock positionLock positiond. While checking the fluid level, also check the condition. Ifthe fluid is black or if it smells burnt, have it changed.e. After checking, return the dipstick to lock position.2. With the engine still idling, check the fluid level andcondition on the dipstick. If necessary, add automatictransmission fluid type T-II or equivalent.CAUTION:When the engine is running, keep hands and clothingaway from the moving fan and the engine drive belt.a. Turn the dipstick lever clockwise to unlock position, pull itout and wipe it clean.NOTICE:Avoid overfilling, or the transmission could bedamaged.b. Fully reinsert the dipstick.If coldO.K.If hotO.K.186If hotaddIf coldaddCHASSISCHECKING TIRE PRESSUREHigh tire pressure produces a harsh ride, handling problems,excessive wear at the center of the tire tread, and a greaterpossibility of tire damage from road hazards.The following instructions for checking tire pressure should beobserved:labelD The pressure should be checked only when the tires arecold. If your vehicle has been parked for at least 3 hours andhas not been driven for more than 1.5 km or 1 mile since, youwill get an accurate cold tire pressure reading.D Always use a tire pressure gauge. The appearance of thetire can be misleading. Besides, tire pressures that are evenjust a few pounds off can degrade handling and ride.The recommended cold tire pressures, tire size and thevehicle capacity weight are given on the label inside theglovebox lid.You should check the tire pressures every two weeks or, atleast once a month. And don’t forget the spare! The pressurefor the spare tire should be 250 kPa (2.5 kg/ cm2 or bar, 36 psi).Incorrect tire pressure can reduce tire life and make yourvehicle less safe to drive.Low tire pressure results in excessive wear, poor handling,reduced fuel economy, and the possibility of blowouts fromoverheated tires. Also, low tire pressure can cause poorsealing of the tire bead. If the tire pressure is excessively low,there is the possibility of wheel deformation and / or tireseparation. So keep your tire pressures at the proper level. Ifa tire frequently needs refilling, have it checked by your Lexusdealer.D Do not bleed or reduce tire pressure after driving. It isnormal for the tire pressure to be higher after driving.D Never exceed the vehicle capacity weight. Thepassengers and luggage weight should be located so thatthe vehicle is balanced.D Be sure to reinstall the tire inflation valve caps. Withoutthe valve caps, dirt or moisture could get into the valve coreand cause air leakage. If the caps have been lost, have newones put on as soon as possible.187CHASSISROTATING TIRESTurning direction indicator (“L” or “R”)CHECKING AND REPLACINGTIRESWhen to replace your tiresTread wear indicatorTo equalize the wear of your tires, rotate the tires every12000 km (7500 miles).The wheel assemblies are of the uni-directional type and mustbe rotated only between the front and rear as illustrated above.When rotating tires, check for uneven wear and damage.Abnormal wear is usually caused by incorrect tire pressure,improper wheel alignment, out-of-balance wheels, or severebraking.Before storing radial, snow or studded tires, mark the directionof rotation and be sure to install them in the same directionwhen replacing. Tires should be stored in a cool dry place.Turning direction indicator means “L” mark is for the lest-sidewheel or “R” mark is for the right-side wheel.188New treadWorn treadReplace the tires when the tread wear indicators show.The tires on your Lexus have built-in tread wear indicators tohelp you know when the tires need replacement. When thetread depth wears to 1.6 mm (0.06 in.) or less, the indicatorswill appear. If you can see the indicators in two or moreadjacent grooves, the tire should be replaced.The effectiveness of snow tires is lost if the tread wearsdown below 4 mm (0.16 in.).CHASSISIf you have tire damage such as cuts, splits, cracks deepenough to expose the fabric, or bulges indicating internaldamage, the tire should be replaced.If a tire often does flat or cannot be properly repaired due to thesize or location of a cut or other damage, it should be replaced.If you are not sure, consult with your Lexus dealer.If an air loss occurs while driving, do not continue driving witha deflated tire. Driving even a short distance can damage a tirebeyond repair.Uniform tire quality gradingThis information has been prepared in accordance withregulations issued by the National Highway Traffic SafetyAdministration of the U.S Department of Transportation.It provides the purchasers and / or prospectivepurchasers of Lexus vehicles with information on uniformtire quality grading.Treadwear − The treadwear grade is a comparative ratingbased on the wear rate of the tire when tested under controlledconditions on a specified government test course. Forexample, a tire graded 150 would wear one and a half (1-1 / 2)times as well on the government course as a tire graded 100.The relative performance of tires depends upon the actualconditions of their use, however, and may depart significantlyfrom the norm due to variations in driving habits, servicepractices and differences in road characteristics and climate.Traction A, B, C − The traction grades, from highest to lowest,are A, B and C, and they represent the tire’s ability to stop onwet pavement as measured under controlled conditions onspecified government test surfaces of asphalt and concrete. Atire marked C may have poor traction performance.Warning: The traction grade assigned to this tire is based onbraking (straight ahead) traction tests and does not includecornering (turning) traction.Your Lexus dealer will help answer any questions you mayhave as you read this information.DOT quality grades − All passenger vehicle tires mustconform to Federal Safety Requirements in addition tothese grades. These quality grades are molded on thesidewall.189CHASSISTemperature A, B, C − The temperature grades are A (thehighest), B, and C, representing the tire’s resistance to thegeneration of heat and its ability to dissipate heat when testedunder controlled conditions on a specified indoor laboratorytest wheel. Sustained high temperature can cause the materialof the tire to degenerate and reduce tire life, and excessivetemperature can lead to sudden tire failure. The grade Ccorresponds to a level of performance which all passenger cartires must meet under the Federal Motor Vehicle SafetyStandard No. 109. Grades B and A represent higher levels ofperformance on the laboratory test wheel than the minimumrequired by law.Warning: The temperature grade of this tire is established fora tire that is properly inflated and not overloaded. Excessivespeed, underinflation, or excessive loading, either separatelyor in combination, can cause heat buildup and possible tirefailure.Tire selectionWhen replacing a tire, use only the same size andconstruction as originally installed and with the same orgreater load capacity.Using any other size or type of tire may seriously affecthandling, ride, speedometer / odometer calibration, groundclearance, and clearance between the body and tires or snowchains.Do not mix radial, belted, or conventional tires on yourvehicle.190It can cause dangerous handling characteristics, resulting inloss of control. If you need to change from conventional tiresto radial tires or vice versa, replace them as a set.INSTALLING SNOW TIRES ANDCHAINSWhen to use snow tires or chainsSnow tires or chains are recommended when driving onsnow or ice.On wet or dry roads, conventional or radial tires provide bettertraction than snow or studded tires.Snow tire selectionIf you need snow tires, select the same size, constructionand load capacity as the original tires on your Lexus.Do not use tires other than stated above. Since your vehiclehas radial tires as original equipment, make sure your snowtires also have radial constructor. Do not install studded tireswithout first checking local regulations for possible restrictions.Snow tire installationSnow tires should be installed on all wheels.Installing snow tires on the rear wheels only can lead to anexcessive difference in road grip capability between the frontand rear tires which could cause loss of vehicle control.CHASSISCAUTION:D Snow tires should be inflated to 30 kPa (0.3 kg / cm2 orbar, 4 psi) above the normal cold tire recommendations,but never above the maximum cold tire pressure shownon the tire sidewall.D Never drive over 120 km / h (75 mph) with any type ofsnow tires.Tire chain selectionREPLACING WHEELSWhen to replace your wheelsIf you have wheel damage such as bends, cracks or heavycorrosion, the wheel should be replaced.If you fail to replace damaged wheels, a tire may slip off a wheelor they may cause loss of handling control.Use SAE Class “S” type radial tire chains except radial cablechains or V-bar type chains.Replacement with used wheels is not recommended as theymay have been subjected to rough treatment or high mileageand could fail without warning. Also, bent wheels which havebeen straightened may have hidden structural damage andtherefore should not be used. Never use an inner tube in aleaking wheel which is designed for a tubeless tire.Chain installationWheel selectionInstall the chains on the rear tires as tightly as possible.Do not use tire chains on the front tires. Retighten chainsafter driving 0.5 − 1.0 km (1 / 4 − 1 / 2 mile).When replacing wheels, care should be taken to ensurethat they are equivalent to those removed in load capacity,diameter, rim width, and offset.When installing chains on your tires, carefully follow theinstructions of the chain manufacturer.Correct replacement wheels are available at your Lexusdealer.CAUTION:D Do not exceed 50 km / h (30 mph) or the chainmanufacturer’s recommended speed limit, whicheveris lower.A wheel of a different size or type may adversely affecthandling, wheel and bearing life, brake cooling,speedometer / odometer calibration, stopping ability, headlightaim, bumper height, vehicle ground clearance, and tire or snowchain clearance to the body and chassis.Regulations regarding the use of tire chains varyaccording to location or type of road. Always check thelocal regulations before installing chains.D Drive carefully avoiding bumps, holes, and sharp turns,which may cause the vehicle to bounce.D Avoid sharp turns or locked-wheel braking, as use ofchains may adversely affect vehicle handling.191CHASSISALUMINUM WHEELPRECAUTIONSD After driving your vehicle the first 1600 km (1000 miles),check that the wheel nuts are tight.D If you have rotated, repaired, or changed your tires, checkthat the wheel nuts are still tight after driving 1600 km (1000miles).D When using tire chains, be careful not to damage thealuminum wheels.D Use Only the Lexus wheel nuts and wrench designed foryour aluminum wheels.D When balancing your wheels, use only Lexus balanceweights or equivalent and a plastic or rubber hammer.D As with any wheel, periodically check your aluminumwheels for damage. If damaged, replace immediately.192