2000 LEXUS GS400 Service Repair Manual

IN±42
± INTRODUCTIONTERMS
42 Author: Date:
2000 LEXUS GS300/GS400 (RM718U) HO2S
Heated Oxygen SensorHeated Oxygen Sensor (HO2S)
IACIdle Air ControlIdle Speed Control (ISC)
IATIntake Air TemperatureIntake or Inlet Air Temperature
ICMIgnition Control Module±
IFIIndirect Fuel InjectionIndirect Injection (IDL)
IFSInertia Fuel±Shutoff±
ISCIdle Speed Control±
KSKnock SensorKnock Sensor
MAFMass Air FlowAir Flow Meter
MAPManifold Absolute PressureManifold Pressure
Intake Vacuum
MCMixture Control
Electric Bleed Air Control Valve (EBCV)
Mixture Control Valve (MCV)
Electric Air Control Valve (EACV)
MDPManifold Differential Pressure±
MFIMultiport Fuel InjectionElectronic Fuel Injection (EFI)
MILMalfunction Indicator LampCheck Engine Lamp
MSTManifold Surface Temperature±
MVZManifold Vacuum Zone±
NVRAMNon±Volatile Random Access Memory±
O2SOxygen SensorOxygen Sensor, O2 Sensor (O2S)
OBDOn±Board DiagnosticOn±Board Diagnostic System (OBD)
OCOxidation Catalytic ConverterOxidation Catalyst Convert (OC), CCo
OPOpen LoopOpen Loop
PAIRPulsed Secondary Air InjectionAir Suction (AS)
PCMPowertrain Control Module±
PNPPark/Neutral Position±
PROMProgrammable Read Only Memory±
PSPPower Steering Pressure±
PTOXPeriodic Trap OxidizerDiesel Particulate Filter (DPF)
Diesel Particulate Trap (DPT)
RAMRandom Access MemoryRandom Access Memory (RAM)
RMRelay Module±
ROMRead Only MemoryRead Only Memory (ROM)
RPMEngine SpeedEngine Speed
SCSuperchargerSupercharger
SCBSupercharger BypassE±ABV
SFISequential Multiport Fuel InjectionElectronic Fuel Injection (EFI), Sequential Injection
SPLSmoke Puff Limiter±
SRIService Reminder Indicator±
SRTSystem Readiness Test±
STScan Tool±
TBThrottle BodyThrottle Body
TBIThrottle Body Fuel InjectionSingle Point Injection
Central Fuel Injection (Ci)
TCTurbochargerTurbocharger
TCCTorque Converter ClutchTorque Converter

± INTRODUCTIONTERMS
IN±43
43 Author: Date:
2000 LEXUS GS300/GS400 (RM718U) TCM
Transmission Control ModuleTransmission ECU, ECT ECU
TPThrottle PositionThrottle Position
TRTransmission Range±
TVVThermal Vacuum ValveBimetallic Vacuum Switching Valve (BVSV)
Thermostatic Vacuum Switching Valve (TVSV)
TWCThree±Way Catalytic Converter
Three±Way Catalytic (TWC)
Manifold Converter
CC
RO
TWC+OCThree±Way + Oxidation Catalytic ConverterCCR + CCo
VA FVolume Air FlowAir Flow Meter
VRVoltage RegulatorVoltage Regulator
VSSVehicle Speed SensorVehicle Speed Sensor
WOTWide Open ThrottleFull Throttle
WU±OCWarm Up Oxidation Catalytic Converter±
WU±TWCWarm Up Three±Way Catalytic Converter±
3GRThird Gear±
4GRFourth Gear±

IN04O±03
B02385
Front
JACK POSITION
PANTOGRAPH JACK POSITION
SUPPORT POSITIONFront
RearFront crossmember
Differential carrier
CAUTION : When jacking±up the front and rear, make sure the car is
not carrying any extra weight.
Safety stand and swing arm type lift
IN±8
± INTRODUCTIONREPAIR INSTRUCTIONS
8 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
VEHICLE LIFT AND SUPPORT LOCATIONS

B02135
Plate type lift
HINT :Attachment
AB
Left and right set position Place the vehicle over the center of the lift.
Front and rear set position
Align the attachment upper end (B) with the
Attachment dimensions
85 mm (3.35 in.)
70 mm (2.76 in.)
200 mm (7.87 in.) 100 mm (3.94 in.)C


Align the cushion gum ends of the plate
with the attachment lower ends (A, C).


When using attachments, place the one for
front side vertically and the one for rear side
horizontally to the vehicle.
rocker flange rear side notch.
± INTRODUCTIONREPAIR INSTRUCTIONS
IN±9
9 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

B00319
Recommended Viscosity (SAE):
TEMPERATURE RANGE ANTICIPATED BEFORE NEXT OIL CHANGE °F
°C±20
±29 0
±1820
±740
460
1680
27100
38 10W±30
5W±30 PREFERRED
LU05G±04
B01610
Oil PressureOil Pressure SwitchGauge
Union Bolt
P12478
Adhesive
± LUBRICATION (2JZ±GE)OIL AND FILTER
LU±1
1573 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
OIL AND FILTER
INSPECTION
1. CHECK OIL QUALITY
Check the oil for deterioration, entry of water, discoloring or thin-
ning.
If oil quality is visibly poor, replace the oil.
Oil grade:
API grade SJ, Energy±Conserving or ILSAC multi-
grade engine oil. SAE 5W±30 is the best choice for
your vehicle, for good fuel economy, and good start-
ing in cold weather.
2. CHECK ENGINE OIL LEVEL
After warming up the engine and then 5 minutes after the en-
gine stop, oil level should be between the low level and full level
marks of the dipstick.
If low, check for leakage and add oil up to the full level mark.
NOTICE:
Do not fill with engine oil above the full level mark.
3. REMOVE OIL PRESSURE SWITCH, AND INSTALL OIL
PRESSURE GAUGE
(a) Disconnect the oil pressure switch connector.
(b) Using SST, remove the oil pressure switch.
SST 09816±30010
(c) Install an oil pressure gauge.
4. WARM UP ENGINE
Allow the engine to warm up to normal operating temperature.
5. CHECK OIL PRESSURE
Oil pressure:
At idle49 kPa (0.5 kgf/cm2, 7 psi) or more
At 3,000 rpm324 kPa (3.3 kgf/cm2, 47 psi) or more
6. REMOVE OIL PRESSURE GAUGE AND REINSTALL
OIL PRESSURE SWITCH
(a) Remove the oil pressure gauge.
(b) Tighten the union bolt.
Torque: 90 N´m (900 kgf´cm, 66 ft´lbf)
(c) Apply adhesive to 2 or 3 threads of the oil pressure switch.
Adhesive:
Part No.08833±00080, THREE BOND 1344,
LOCTITE 242 or equivalent
(d) Using SST, install the oil pressure switch.
SST 09816±30010
Torque: 15 N´m (150 kgf´cm, 11 ft´lbf)
(e) Connect the oil pressure switch connector.
7. START ENGINE AND CHECK FOR LEAKS

LU05M±01
LU±10
± LUBRICATION (2JZ±GE)OIL PUMP
1582 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REPLACEMENT
REPLACE FRONT CRANKSHAFT OIL SEAL (See page EM±88).

LU05N±01
P02186
Mark
P02443
S01373
Plug
New
Gasket
Relief
ValveCompression Spring
± LUBRICATION (2JZ±GE)OIL PUMP
LU±11
1583 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REASSEMBLY
1. INSTALL DRIVE AND DRIVEN ROTORS
(a) Place the drive and driven rotors into oil pump body with
the mark facing upward.
(b) Install the pump body cover with the 10 screws.
Torque: 10 N´m (105 kgf´cm, 8 ft´lbf)
2. INSTALL RELIEF VALVE
(a) Carefully mount the pump body in a soft jaw vise.
NOTICE:
Be careful not to damage the pump body.
(b) Insert the relief valve and compression spring into the oil
pump body hole.
(c) Install the plug with a new gasket.
Torque: 49 N´m (500 kgf´cm, 36 ft´lbf)

LU05O±03
P03946
New O±Ring
Z02385
Seal Width
2 ± 3 mmA
B
A
B
P03936
Long
Bolt LU±12
± LUBRICATION (2JZ±GE)OIL PUMP
1584 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
1. INSTALL OIL PUMP
(a) Place 2 new O±rings in position on the cylinder block.
(b) Remove any old packing (FIPG) material and be careful
not to drop any oil on the contact surfaces of the oil pump
and cylinder block.

Using a razor blade gasket scraper, remove all the
old packing (FIPG) material from the gasket
surfaces and sealing groove.

Thoroughly clean all components to remove all the
debris.

Using a non±residue solvent, clean both sealing
surfaces.
NOTICE:
Do not use a solvent which will affect the painted surfaces.
(c) Apply seal packing to the oil pump as shown in the illustra-
tion.
Seal packing: Part No.08826±00080 or equivalent

Install a nozzle that has been cut to a 2 ± 3 mm (0.08
± 0.12 in.) opening.
HINT:
Avoid applying an excessive amount to the surface. Be particu-
larly careful near oil passages.

Parts must be assembled within 5 minutes of ap-
plication. Otherwise the material must be removed
and reapplied.

Immediately remove nozzle from the tube and rein-
stall cap.
(d) Install the oil pump with the 9 bolts.
Torque: 21 N´m (210 kgf´cm, 15 ft´lbf)