check engine LEXUS GS400 2000 Service Repair Manual

MA002±06
MA±2
± MAINTENANCEINSIDE VEHICLE
45 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSIDE VEHICLE
GENERAL MAINTENANCE
These are maintenance and inspection items which are considered to be the owner's responsibility.
They can be done by the owner or they can have them done at a service shop.
These items include those which should be checked on a daily basis, those which, in most cases, do not
require (special) tools and those which are considered to be reasonable for the owner to do.
Items and procedures for general maintenance are as follows.
1. GENERAL NOTES

Maintenance items may vary from country to country. Check the owner's manual supplement in which
the maintenance schedule is shown.

Every service item in the periodic maintenance schedule must be performed.

Periodic maintenance service must be performed according to whichever interval in the periodic main-
tenance schedule occurs first, the odometer reading (miles) or the time interval (months).

Maintenance service after the last period should be performed at the same interval as before unless
otherwise noted.

Failure to do even one item an cause the engine to run poorly and increase exhaust emissions.
2. LIGHTS
(a) Check that the headlights, stop lights, taillights, turn signal lights, and other lights are all working.
(b) Check the headlight aiming.
3. WARNING LIGHTS AND BUZZERS
Check that all warning lights and buzzers function properly.
4. HORN
Check that it is working.
5. WINDSHIELD GLASS
Check for scratches, pits or abrasions.
6. WINDSHIELD WIPER AND WASHER
(a) Check operation of the wipers and washer.
(b) Check that the wipers do not streak.
7. WINDSHIELD DEFROSTER
Check that air comes out from the defroster outlet when operating the heater or air conditioner.
8. REAR VIEW MIRROR
Check that it is mounted securely.
9. SUN VISORS
Check that they move freely and are mounted securely.
10. STEERING WHEEL
Check that it has the specified freeplay. Be alert for changes in steering condition, such as hard steering,
excessive freeplay or strange noises.
11. SEATS
(a) Check that all front seat controls such as seat adjusters, seatback recliner, etc. operate smoothly.
(b) Check that all latches lock securely in any position.
(c) Check that the locks hold securely in any latched position.
(d) Check that the head restraints move up and down smoothly and that the locks hold securely in any
latches position.
(e) For folding±down rear seat backs, check that the latches lock securely.
12. SEAT BELTS
(a) Check that the seat belt system such as the buckles, retractors and anchors operate properly and
smoothly.
(b) Check that the belt webbing is not cut, frayed, worn or dameged.

MA003±06
MA±4
± MAINTENANCEUNDER HOOD
47 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
UNDER HOOD
GENERAL MAINTENANCE
1. GENERAL NOTES

Maintenance items may vary from country to country. Check the owner's manual supplement in which
the maintenance schedule is shown.

Every service item in the periodic maintenance schedule must be performed.

Periodic maintenance service must be performed according to whichever interval in the periodic main-
tenance schedule occurs first, the odometer reading (miles) or the time interval (months).

Maintenance service after the last period should be performed at the same interval as before unless
otherwise noted.

Failure to do even one item an cause the engine to run poorly and increase exhaust emissions.
2. WINDSHIELD WASHER FLUID
Check that there is sufficient fluid in the tank.
3. ENGINE COOLANT LEVEL
Check that the coolant level is between the ºFULLº and ºLOWº lines on the see±through reservoir.
4. RADIATOR AND HOSES
(a) Check that the front of the radiator is clean and not blocked with leaves, dirt or bugs.
(b) Check the hoses for cracks, kinks, rot or loose connections.
5. BATTERY ELECTROLYTE LEVEL
Check that the electrolyte level of all battery cells is between the upper and lower level lines on the case.
6. BRAKE FLUID LEVEL
Check that the brake fluid levels are near the upper level line on the see±through reservoirs.
7. ENGINE DRIVE BELT
Check drive belt for fraying, cracks, wear or oiliness.
8. ENGINE OIL LEVEL
Check the level on the dipstick with the engine turned off.
9. POWER STEERING FLUID LEVEL

Check the level on the dipstick.

The level should be in the ºHOTº or ºCOLDºrange depending on the fluid temperature.
10. AUTOMATIC TRANSMISSION FLUID LEVEL
(a) Park the vehicle on a level surface.
(b) With the engine idling and the parking brake applied, shift the selector into all positions from ºPº to ºLº,
and then shift into ºPº position.
(c) Pull out the dipstick and wipe off the fluid with a clean rag. Re±insert the dipstick and check that the
fluid level is in the HOT range.
(d) Do this check with the fluid at normal driving temperature (70 ± 80°C, 158 ± 176°F).
HINT:
Wait until the engine cools down (approx. 30 min.) before checking the fluid level after extended driving at
high speeds, in hot weather, in heavy traffic or pulling a trailer.
11. EXHAUST SYSTEM
If any change in the sound of the exhaust or smell of the exhaust fumes is noticed, have the cause located
and corrected.

MA004±04
B01384
± MAINTENANCEENGINE
MA±5
48 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
ENGINE
INSPECTION
HINT:
Inspect these items when the engine is cold.
1. REPLACE TIMING BELT
(2JZ±GE ENGINE: See page EM±16)
(1UZ±FE ENGINE: See page EM±14)
2. INSPECT DRIVE BELT
(2JZ±GE ENGINE: See page CH±1)
(1UZ±FE ENGINE: See page CH±1)
3. REPLACE SPARK PLUGS
(2JZ±GE ENGINE: See page IG±1)
(1UZ±FE ENGINE: See page IG±1)
4. INSPECT AIR FILTER
(a) Remove the air filter.
(b) Visually check that the air filter is not excessively dam-
aged or oily.
If necessary, replace the air filter.
(c) Clean the filter with compressed air.
First blow from the inside thoroughly, then blow the out-
side of the filter.
(d) Reinstall the air filter.
5. REPLACE AIR FILTER
Replace the air filter with a new one.
6. REPLACE ENGINE OIL AND OIL FILTER
(2JZ±GE ENGINE: See page LU±2)
(1UZ±FE ENGINE: See page LU±3)
7. REPLACE ENGINE COOLANT
(2JZ±GE ENGINE: See page CO±2)
(1UZ±FE ENGINE: See page CO±2)
8. REPLACE GASKET IN FUEL TANK CAP
(2JZ±GE ENGINE: See page EC±7)
(1UZ±FE ENGINE: See page EC±7)
9. INSPECT FUEL LINES AND CONNECTIONS
Visually check the fuel lines for cracks, leakage, loose connec-
tions, deformation or tank band looseness.
10. INSPECT EXHAUST PIPES AND MOUNTINGS
Visually check the pipes, hangers and connections for severe
corrosion, leaks or damage.
11. ADJUST VALVE CLEARANCE
(2JZ±GE ENGINE: See page EM±5)
(1UZ±FE ENGINE: See page EM±4)

B01983
37 N´m
B01657
127 N´m127 N´m
MA01T±01
B01658
98 N´m
MA±8
± MAINTENANCEBODY
51 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
BODY
INSPECTION
1. TIGHTEN BOLTS AND NUTS ON CHASSIS AND BODY
Tighten these parts:

Front seat mounting bolts
Torque: 37 N´m (375 kgf´cm, 27 ft´lbf)

Front suspension member±to±body mounting nuts
Torque: 98 N´m (1,000 kgf´cm, 72 ft´lbf)

Rear suspension member±to±body mounting bolts
Torque: 127 N´m (1,300 kgf´cm, 94 ft´lbf)
2. BODY INSPECTION
(a) Check the body exterior for dents, scratches and rust.
(b) Check the underbody for rust and damage.
If necessary, replace or repair.
3. ROAD TEST
(a) Check the engine and chassis for abnormal noises.
(b) Check that the vehicle does not wander or pull to one
side.
(c) Check that the brakes work properly and do not drag.
(d) Do setting of the parking brake shoes and drum.
4. FINAL INSPECTION
(a) Check the operation of the body parts:

Hood
Auxiliary catch operates properly
Hood locks securely when closed

Front and rear doors
Door locks operate properly
Doors close properly

Luggage compartment door
Door lock operates properly

Seat adjusts easily and locks securely in any posi-
tion
Front seat back locks securely in any position
Folding±down rear seat backs lock securely

± PREPARATIONENGINE MECHANICAL (2JZ±GE)
PP±3
55 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(09316±00051)Replacer ºDºCamshaft oil seal
09330±00021Companion Flange Holding ToolCrankshaft pulley
09816±30010Oil Pressure Switch SocketKnock sensor
Oil pressure switch
09843±18020Diagnosis Check Wire
09950±50012Puller C Set
(09951±05010)Hanger 150Crankshaft pulley
Crankshaft timing pulley
(09952±05010)Slide ArmCrankshaft pulley
Crankshaft timing pulley
(09953±05020)Center Bolt 150Crankshaft pulley
Crankshaft timing pulley
(09954±05010)Claw No.1Crankshaft timing pulley
(09954±05030)Claw No.3Crankshaft pulley
09950±70010Handle Set
(09951±07100)Handle 100Valve guide bushing
Crankshaft rear oil seal
09960±10010Variable Pin Wrench Set

Z10210
SST
± PROPELLER SHAFTPROPELLER SHAFT ASSEMBLY
PR±11
1998 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(i) Using SST, tighten the adjusting nut.
SST 09922±10010
Torque: 50 N´m (515 kgf´cm, 37 ft´lbf)
HINT:
Use a torque wrench with a fulcrum length of 34.5 cm (13.6 in.).
2. INSPECT JOINT ANGLE (See page PR±12)
NOTICE:
The joint angle should by all means be checked when the
propeller shaft is removed and installed.
3. INSTALL 2 HEAT INSULATORS
(a) Install the heat insulator and torque the 4 bolts.
Torque: 5.4 N´m (55 kgf´cm, 48 in.´lbf)
(b) Install the heat insulator and torque the 6 bolts.
Torque: 5.4 N´m (55 kgf´cm, 48 in.´lbf)
4. INSTALL EXHAUST PIPE ASSEMBLY
(a) Connect the exhaust pipe assembly to the O±rings.
(b) 2JZ±GE Engine:
Install the 3 bolts, nuts and 2 gaskets to the exhaust man-
ifold. Torque the bolts.
Torque: 44 N´m (450 kgf´cm, 33 ft´lbf)
(c) 1UZ±FE Engine:
Install the 4 bolts, nuts and 2 gaskets to the exhaust man-
ifold. Torque the bolts.
Torque: 44 N´m (450 kgf´cm, 33 ft´lbf)
(d) Install the front floor center brace and torque the 2 bolts.
Torque: 7.4 N´m (75 kgf´cm, 65 in.´lbf)
(e) Connect the heated oxygen sensor.
Torque: 44 N´m (450 kgf´cm, 33 ft´lbf)
HINT:

Before installing the oxygen sensor, twist the sensor wire
counterclockwise 3 and 1/2 turns.

After installing oxygen sensor, check that the sensor wire
should not twist. If it is twisted, remove the oxygen sensor
and reinstall it.

SF0N1±03
± SFI (2JZ±GE)SFI SYSTEM
SF±1
1467 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
SFI SYSTEM
PRECAUTION
1. BEFORE WORKING ON FUEL SYSTEM, DISCON-
NECT NEGATIVE (±) TERMINAL CABLE FROM BAT-
TERY
HINT:
Any diagnostic trouble code retained by the ECM will be erased
when the battery negative (±) terminal cable is removed from
the battery.
Therefore, if necessary, read the diagnostic trouble code(s) be-
fore removing the negative (±) terminal cable from the battery.
2. DO NOT SMOKE OR WORK NEAR AN OPEN FLAME
WHEN WORKING ON FUEL SYSTEM
3. KEEP GASOLINE AWAY FROM RUBBER OR LEATH-
ER PARTS
4. MAINTENANCE PRECAUTIONS
(a) Precaution when the connecting gauge.
Use battery as the power source for the timing light, etc.
(b) In the event of engine misfire, these precautions should
be taken.
(1) Check proper connection of battery terminals, etc.
(2) Handle high±tension cords carefully.
(3) After repair work, check that the ignition coil termi-
nals and all other ignition system lines are recon-
nected securely.
(4) When cleaning the engine compartment, be espe-
cially careful to protect the electrical system from
water.
(c) Precautions when the handling heated oxygen sensors.
(1) Do not allow oxygen sensor to drop or hit against an
object.
(2) Do not allow the sensor to come into contact with
water.
5. IF VEHICLE IS EQUIPPED WITH MOBILE RADIO SYS-
TEM (HAM, CB, ETC.)
If the vehicle is equipped with a mobile communication system,
refer to the precaution in the IN section.
6. AIR INDUCTION SYSTEM
(a) Separation of the engine oil dipstick, oil filler cap, PCV
hose, etc. may cause the engine to run out of tune.
(b) Disconnection, looseness or cracks in the parts of the air
induction system between the throttle body and cylinder
head will cause air suction and cause the engine to run
out of tune.

FI2553
SST
SF±2
± SFI (2JZ±GE)SFI SYSTEM
1468 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
7. ELECTRONIC CONTROL SYSTEM
(a) Before removing SFI wiring connectors, terminals, etc.,
first disconnect the power by either turning the ignition
switch OFF or disconnecting the negative (±) terminal
cable from the battery.
HINT:
Always check the diagnostic trouble code before disconnecting
the negative (±) terminal cable from the battery.
(b) When installing the battery, be especially careful not to in-
correctly connect the positive (+) and negative (±) cable
terminals.
(c) Do not permit parts to receive a severe impact during re-
moval or installation. Handle all SFI parts carefully, espe-
cially the ECM.
(d) Do not be careless during troubleshooting as there are
numerous transistor circuits and even slight terminal con-
tact can further troubles.
(e) Do not open the ECM cover.
(f) When inspecting during rainy weather, take care to pre-
vent entry of water. Also, when washing the engine
compartment, prevent water from getting on the SFI parts
and wiring connectors.
(g) Parts should be replaced as an assembly.
(h) Care is required when pulling out and inserting wiring con-
nectors.
(1) Release the lock and pull out the connector, pulling
on the connectors.
(2) Fully insert the connector and check that it is locked.
(i) When inspecting a connector with a volt/ohmmeter.
(1) Carefully take out the water±proofing rubber if it is
a water±proof type connector.
(2) Insert the test probe into the connector from wiring
side when checking the continuity, amperage or
voltage.
(3) Do not apply unnecessary force to the terminal.
(4) After checking, install the water±proofing rubber on
the connector securely.
(5) Use SST for inspection or test of the injector or its
wiring connector.
SST 09842±30070

P09286
New O±ring
CORRECT
WRONG Grommet
Injector
Delivery Pipe
B01575
O±Ring Delivery Pipe
Grommet
Spacer Insulator
O±Ring
B02046
Push
B02045
Push Pull
SF±4
± SFI (2JZ±GE)SFI SYSTEM
1470 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(c) Observe these precautions when removing and installing
the injectors.
(1) Never reuse the O±ring.
(2) When placing a new O±ring on the injector, take
care not to damage it in any way.
(3) Coat a new O±ring with spindle oil or gasoline be-
fore installing±never use engine, gear or brake oil.
(d) Install the injector to the delivery pipe and intake manifold
as shown in the illustration.
Before installing the injector, must apply spindle oil or gas-
oline on the place where a delivery pipe or an intake man-
ifold touches an O±ring of the injector.
(e) Observe these precautions when disconnecting the fuel
tube connector (quick type):
(1) Check if there is any dirt like mud on the pipe and
around the connector before disconnecting them
and clean the dirt away.
(2) Be sure to disconnect with hands.
(3) When the connector and the pipe are stuck, push
and pull the connector to free to disconnect and pull
it out. Do not use any tool at this time.
(4) Inspect if there is any dirt or the likes on the seal sur-
face of the disconnected pipe and clean it away.
(5) Prevent the disconnected pipe and connector from
damaging and mixing foreign objects by covering
them with a vinyl bag.
(f) Observe these precautions when connecting the fuel
tube connector (quick type):
(1) Check if there is any damage or foreign objects on
the connected part of the pipe.
(2) Match the axis of the connector with axis of the pipe,
and push in the connector until the connector
makes a ºclickº sound. In case the connections is
tight, apply little amount of new engine oil on the tip
of the pipe.

B02077
Pull
B01982
LEXUS
Hand±Held
Tester
± SFI (2JZ±GE)SFI SYSTEM
SF±5
1471 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(3) After having finished the connection, check if the
pipe and the connector are securely connected by
pulling them.
(4) Check if there is any fuel leakage.
(g) Observe these precautions when handling nylon tube.
(1) Pay attention not to turn the connected part of the
nylon tube and quick connector with force when
connecting them.
(2) Pay attention not to kink the nylon tube.
(3) Do not remove the EPDM protector on the outside
of the nylon tube.
(4) Must not close the piping with the nylon tube by
bending it.
(h) Check that there are no fuel leaks after doing mainte-
nance anywhere on the fuel system.
(1) Connect a LEXUS hand±held tester to the DLC3.
(2) Turn the ignition switch ON and push the LEXUS
hand±held tester main switch ON.
NOTICE:
Do not start the engine.
(3) Select the ACTIVE TEST mode on the LEXUS
hand±held tester.
(4) Please refer to the LEXUS hand±held tester opera-
tor 's manual for further details.
(5) If you have no LEXUS hand±held tester, connect
the positive (+) and negative (±) leads from the bat-
tery to the fuel pump connector.
(See page SF±6)
(6) Check that there are no leaks from any part of the
fuel system.
(7) Turn the ignition switch OFF.
(8) Disconnect the LEXUS hand±held tester from the
DLC3.
(9) Start the engine.
NOTICE:
Keep cranking the engine until the air is removed from the
fuel line.
(10) After the engine starts, check again that there are
no fuel leaks.