2000 LEXUS GS400 sensor

EM0DJ±03
A02768
N´m (kgf´cm, ft´lbf) : Specified torque
 Non±reusable part

Precoated partRH Engine Mounting Bracket and Insulator Assembly
No.2 Water Bypass Pipe with Hose
 Gasket
Water Pump

Engine Coolant Drain Plug
 O±Ring
21 (210, 15)
 O±Ring O±RingKnock Sensor 1
Knock Sensor 2
GeneratorFuel Inlet Pipe
Oil Pump
 Crankshaft Front Oil Seal
Oil Filter and
Bracket AssemblyNo.1 Oil Pipe
Union Bolt
55 (550, 41) Gasket
90 (900, 66)Union Bolt

Oil Pressure Switch
 Gasket21 (210, 15)
x 9
 O±Ring
x 6
x 6x 16
 Gasket
No.1 Oil Pan
Oil Pan Baffle Plate
Oil Strainer
LH Engine Mounting Bracket
and Insulator Assembly
 Gasket
x 16
No.2 Oil Pan
x 6
Drain Plug
EM±74
± ENGINE MECHANICAL (2JZ±GE)CYLINDER BLOCK
1428 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
CYLINDER BLOCK
COMPONENTS

EM0DK±03
P02447
EM±76
± ENGINE MECHANICAL (2JZ±GE)CYLINDER BLOCK
1430 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
DISASSEMBLY
1. INSTALL ENGINE TO ENGINE STAND FOR
DISASSEMBLY
2. REMOVE GENERATOR
Remove the bolt, nut, pipe bracket and generator.
3. REMOVE TIMING BELT AND PULLEYS
(See page EM±16)
4. REMOVE NO.2 WATER BYPASS PIPE WITH HOSE
Remove the bolt, 2 nuts, No.2 water bypass pipe and gasket.
5. REMOVE WATER PUMP
Remove the 6 bolts, water pump and O±ring.
6. REMOVE CYLINDER HEAD (See page EM±33)
7. REMOVE OIL PRESSURE SWITCH AND KNOCK
SENSORS
Using SST, remove the switch and sensors.
SST 09816±30010
8. REMOVE OIL FILTER AND BRACKET ASSEMBLY
(a) Remove the union bolt and oil filter bracket.
(b) Remove the gasket from the union bolt.
(c) Remove the O±ring from the oil filter bracket.
9. REMOVE NO.1 OIL PIPE
Remove the union bolt, No.1 oil pipe and 2 gaskets.
10. REMOVE FUEL INLET PIPE
Remove the 2 bolts and fuel inlet pipe.
11. REMOVE LH ENGINE MOUNTING BRACKET AND
INSULATOR ASSEMBLY
Remove the 4 bolts and mounting bracket.
12. REMOVE RH ENGINE MOUNTING BRACKET AND
INSULATOR ASSEMBLY
Remove the 4 bolts and mounting bracket.
13. REMOVE OIL PUMP (See page LU±6)
14. REMOVE REAR OIL SEAL RETAINER
(a) Remove the 6 bolts of the retainer.
(b) Remove the oil seal retainer by prying the area between
the oil seal retainer and main bearing cap with a screw-
driver.

EM±96
± ENGINE MECHANICAL (2JZ±GE)CYLINDER BLOCK
1450 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
20. INSTALL OIL FILTER AND BRACKET ASSEMBLY
(a) Install a new O±ring to the oil filter bracket.
(b) Install a new gasket to the union bolt.
(c) Install the oil filter bracket with the union bolt.
Torque: 90 N´m (900 kgf´cm, 65 ft´lbf)
21. INSTALL OIL PRESSURE SWITCH AND KNOCK
SENSORS (See page LU±1, SF±63)
22. INSTALL CYLINDER HEAD (See page EM±52)
23. INSTALL WATER PUMP (See page CO±8)
24. INSTALL NO.2 WATER BYPASS PIPE WITH HOSE
(a) Install the water bypass pipe with the bolt and 2 nuts.
Torque: 21 N´m (210 kgf´cm, 15 ft´lbf)
(b) Connect the water bypass hose to the hose clamp.
25. INSTALL TIMING PULLEYS AND BELT
(See page EM±23)
26. INSTALL GENERATOR
Install the generator and pipe bracket with the bolt and nut.
Torque: 40 N´m (400 kgf´cm, 30 ft´lbf)
27. REMOVE ENGINE STAND FROM ENGINE

EM0DO±03
A09756

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

After installing oxygen sensor, check that
sensor wire is not twisted. If it is twisted,
remove oxygen sensor and reinstall it.HINT:
Ring
RingRing BracketHeat Insulator
RH Tailpipe


Heat
Insulator

 
RingBracketRing Tailpipe
Baffle Gasket
Center Exhaust PIpe
 Gasket
Ring
Heat Insulator
LH Tailpipe
Tailpipe
Baffle
44 (440, 32)
44 (440, 32)
Front Floor
Center Brace
Heated Oxygen Sensor
Heated Oxygen Sensor
(Bank 2 Sensor 2)
Heat InsulatorHeat Insulator
45 (450, 33)
44 (440, 32)
 Gasket
N´m (kgf´cm, ft´lbf) : Specified torque
 Non±reusable partPipe Support Bracket
Front Exhaust Pipe
 Gasket Heat
Insulator
44 (440, 32)
± ENGINE MECHANICAL (2JZ±GE)EXHAUST SYSTEM
EM±97
1451 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
EXHAUST SYSTEM
COMPONENTS

R11910Match Marks
± INTRODUCTIONFOR ALL OF VEHICLES
IN±11
11 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
reset the memory. To avoid erasing the memory of
each memory system, never use a back±up power
supply from another battery.
(3) Even in cases of a minor collision where the SRS
does not deploy, the steering wheel pad, front pas-
senger airbag assembly, side airbag assembly,
front airbag sensor, side airbag sensor and seat belt
pretensioner should be inspected
(See page RS±15, RS±29, RS±42, RS±60, RS±65
and BO±125).
(4) Never use SRS parts from another vehicle. When
replacing parts, replace them with new parts.
(5) Before repairs, remove the airbag sensor if shocks
are likely to be applied to the sensor during repairs.
(6) Never disassemble and repair the airbag sensor as-
sembly, side airbag sensor assembly, steering
wheel pad, front passenger airbag assembly, side
airbag assembly, front airbag sensor, side airbag
sensor or seat belt pretensioner.
(7) If the airbag sensor assembly, side airbag sensor
assembly, steering wheel pad, front passenger air-
bag assembly, side airbag assembly, front airbag
sensor, side airbag sensor or seat belt pretensioner
has been dropped, or if there are cracks, dents or
other defects in the case, bracket or connector, re-
place them with new ones.
(8) Do not directly expose the airbag sensor assembly,
side airbag sensor assembly, steering wheel pad,
front passenger airbag assembly, side airbag as-
sembly, front airbag sensor, side airbag sensor or
seat belt pretensioner to hot air or flames.
(9) Use a volt/ohmmeter with high impedance (10 kW/V
minimum) for troubleshooting of the electrical cir-
cuit.
(10) Information labels are attached to the periphery of
the SRS components. Follow the instructions on the
notices.
(11) After work on the supplemental restraint system is
completed, check the SRS warning light (See page
DI±552).
(c) SPIRAL CABLE (in Combination Switch)
The steering wheel must be fitted correctly to the steering
column with the spiral cable at the neutral position, other-
wise cable disconnection and other troubles may result.
Refer to SR±17 of this manual concerning correct steer-
ing wheel installation.

IN±16
± INTRODUCTIONFOR ALL OF VEHICLES
16 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(h) AIRBAG SENSOR ASSEMBLY
(1) Never reuse the airbag sensor assembly involved
in a collision when the SRS has deployed.
(2) The connectors to the airbag sensor assembly
should be connected or disconnected with the sen-
sor mounted on the floor. If the connectors are con-
nected or disconnected while the airbag sensor as-
sembly is not mounted to the floor, it could cause
undesired ignition of the supplemental restraint sys-
tem.
(3) Work must be started after 90 seconds from the
time the ignition switch is turned to the ºLOCKº posi-
tion and the negative (±) terminal cable is discon-
nected from the battery, even if only loosing the set
bolts of the airbag sensor assembly.
(i) WIRE HARNESS AND CONNECTOR
The SRS wire harness is integrated with the instrument
panel wire harness assembly. All the connectors in the
system are a standard yellow color. If the SRS wire har-
ness becomes disconnected or the connector becomes
broken due to an accident, etc., repair or replace it as
shown on page RS±68.

± INTRODUCTIONFOR ALL OF VEHICLES
IN±17
17 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
2. FOR VEHICLES EQUIPPED WITH A CATALYTIC CONVERTER
CAUTION:
If large amount of unburned gasoline flows into the converter, it may overheat and create a fire haz-
ard. To prevent this, observe the following precautions and explain them to your customer.
(a) Use only unleaded gasoline.
(b) Avoid prolonged idling.
Avoid running the engine at idle speed for more than 20 minutes.
(c) Avoid spark jump test.
(1) Perform spark jump test only when absolutely necessary. Perform this test as rapidly as possible.
(2) While testing, never race the engine.
(d) Avoid prolonged engine compression measurement.
Engine compression tests must be done as rapidly as possible.
(e) Do not run engine when fuel tank is nearly empty.
This may cause the engine to misfire and create an extra load on the converter.
(f) Avoid coasting with ignition turned off.
(g) Do not dispose of used catalyst along with parts contaminated with gasoline or oil.
3. IF VEHICLE IS EQUIPPED WITH MOBILE COMMUNICATION SYSTEM
For vehicles with mobile communication systems such as two±way radios and cellular telephones, observe
the following precautions.
(1) Install the antenna as far as possible away from the ECU and sensors of the vehicle's electronic
system.
(2) Install the antenna feeder at least 20 cm (7.87 in.) away from the ECU and sensors of the ve-
hicle's electronic systems. For details about ECU and sensors locations, refer to the section on
the applicable component.
(3) Avoid winding the antenna feeder together with other wiring as much as possible, and also avoid
running the antenna feeder parallel with other wire harnesses.
(4) Check that the antenna and feeder are correctly adjusted.
(5) Do not install powerful mobile communications system.
4. FOR USING OBD II SCAN TOOL OR LEXUS HAND±HELD TESTER
CAUTION:
Observe the following items for safety reasons:

Before using the OBD II scan tool or LEXUS hand±held tester, the OBD II scan tool's instruction
book or LEXUS hand±held tester's operator manual should be read thoroughly.

Be sure to route all cables securely when driving with the OBD II scan tool or LEXUS hand±held
tester connected to the vehicle. (i.e. Keep cables away from feet, pedals, steering wheel and
shift lever.)

Two persons are required when test driving with the OBD II scan tool or LEXUS hand±held tes-
ter, one person to drive the vehicle and the other person to operate the OBD II scan tool or LEX-
US hand±held tester.

DIAGNOSTIC TROUBLE CODE CHECK PROCEDURE
Diagnostic Trouble
Code Check (Make a
note of and then clear)Confirmation
of SymptomsDiagnostic Trouble
Code CheckProblem Condition
Diagnostic Trouble
Code DisplayProblem symptoms
existSame diagnostic
trouble code is
displayedProblem is still occurring in the diagnostic
circuit
Normal code is
displayedThe problem is still occurring in a place
other than in the diagnostic circuit
(The diagnostic trouble code displayed
first is either for a past problem or it is a
secondary problem)
No problem
symptoms existThe problem occurred in the diagnostic
circuit in the past
Normal Code DisplayProblem symptoms
existNormal code is
displayedThe problem is still occurring in a place
other than in the diagnostic circuit
No problem
symptoms existNormal code is
displayedThe problem occurred in a place other
than in the diagnostic circuit in the past
± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMSIN±23
23 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
2. SYMPTOM CONFIRMATION AND DIAGNOSTIC TROUBLE CODE CHECK
The diagnostic system in the LEXUS GS400/GS300 fulfills various functions. The first function is the Diag-
nostic Trouble Code Check in which a malfunction in the signal circuits to the ECU is stored in code in the
ECU memory at the time of occurrence, to be output by the technician during troubleshooting. Another func-
tion is the Input Signal Check which checks if the signals from various switches are sent to the ECU correctly.
By using these check functions, the problem areas can be narrowed down quickly and troubleshooting can
be performed effectively. Diagnostic functions are incorporated in the following systems in the LEXUS
GS400/GS300.
SystemDiagnostic Trouble
Code CheckInput Signal Check
(Sensor Check)Diagnostic Test
Mode (Active Test)
Engine (2JZ±GE)
Engine (1UZ±FE)
Automatic Transmission
ABS & Hydraulic Brake Booster Power Supply System
Vehicle Skid Control (VSC) & Brake Assist (BA) System
Power Tilt and Power Telescopic Steering Column
Supplemental Restraint System
Cruise Control System
Engine Immobiliser System
Multiplex Communication System
LEXUS Navigation System
Air Conditioning System(with check Mode)
(with check Mode)
(with check Mode)















In diagnostic trouble code check, it is very important to determine whether the problem indicated by the diag-
nostic trouble code is still occurring or occurred in the past but returned to normal at present. In addition,
it must be checked in the problem symptom check whether the malfunction indicated by the diagnostic
trouble code is directly related to the problem symptom or not. For this reason, the diagnostic trouble codes
should be checked before and after the symptom confirmation to determine the current conditions, as shown
in the table below. If this is not done, it may, depending on the case, result in unnecessary troubleshooting
for normally operating systems, thus making it more difficult to locate the problem, or in repairs not pertinent
to the problem. Therefore, always follow the procedure in correct order and perform the diagnostic trouble
code check.