Page 672 of 1111

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)
Page 692 of 1111
PP0TR±04
PP±20
± PREPARATIONLUBRICATION (2JZ±GE)
72 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
LUBRICANT
ItemCapacityClassification
Engine oil
Dry fill
Drain and refill
w/ Oil filter change
w/o Oil filter change
6.5 liters (6.9 US qts, 5.7 Imp. qts)
5.4 liters (5.7 US qts, 4.8 Imp. qts)
5.1 liters (5.4 US qts, 4.5 Imp. qts)
API grade SJ, Energy±Conserving or ILSAC mul-
tigrade engine oil. SAE 5W±30 is the best choice
for your vehicle, for good fuel economy, and good
starting in cold weather.
Page 809 of 1111

± SERVICE SPECIFICATIONSENGINE MECHANICAL (2JZ±GE)
SS±9
165 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)Part tightened
N´mkgf´cmft´lbf
Drive plate x Torque converter clutch4849035
Rear support member x Engine rear mounting insulator13.513510
Front suspension crossmember x Engine mounting insulator7071452
PS gear housing x Front suspension member6566048
Sliding yoke x Steering intermediate shaft3536026
Transmission control rod x Shift lever131309
Transmission control rod x Transmission131309
A/C compressor x Cylinder block Stud bolt
Bolt and nut26
52265
53019
38
Fuel inlet hose x Fuel pipe support2930022
Front suspension member brace x Front suspension member5859043
Front suspension member brace x Strut bar bracket plate5859043
Connecting rod cap x Connecting rod 1st
2nd30
Turn 90°300
Turn 90°22
Turn 90°
Main bearing cap x Cylinder block 1st
2nd45
Turn 90°450
Turn 90°33
Turn 90°
Rear oil seal retainer x Cylinder block6.06053
Engine mounting bracket x Cylinder block5959044
Fuel inlet pipe x Cylinder block2929021
No.1 oil pipe x Cylinder block5555041
Oil filter bracket x Cylinder block9090066
No.2 water bypass pipe x Water pump2121015
No.2 water bypass pipe x Cylinder block2121015
Generator x Water pump4040030
Generator x Cylinder block4040030
Front exhaust pipe x Center exhaust pipe4444032
Center exhaust pipe x Tailpipe4444032
Heated oxygen sensor x Front exhaust pipe4545033
Page 824 of 1111
SF151±01
B08999
N´m (kgf´cm, ft´lbf) : Specified torque
Non±reusable part
21 (210, 15)
21 (210, 15)
VSV Connector for EVAP
Camshaft Position Sensor Connector
No.2 Vacuum Pipe
Accelerator Cable
EVAP Hose
Noise Filter
Connector
Vacuum
Hose
Throttle Position
Sensor Connector
Gasket
PS Air Hose
Engine Wire Clamp
Gasket
Oil Dipstick and
Guide for A/T
Engine Wire
Clamp
42 (420, 31)
Fuel Pressure Pulsation Damper
Gasket
O±Ring
Fuel Inlet Pipe Delivery Pipe
21 (210, 15)
Spacer
Injector Connector O±Ring O±Ring
Injector
Insulator
Grommet
28 (280, 21)
Engine Cover
SF±20
± SFI (2JZ±GE)INJECTOR
1486 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
COMPONENTS
Page 849 of 1111
SF0NU±02
B08998
N´m (kgf´cm, ft´lbf) : Specified torque
Non±reusable part
21 (210, 15)
21 (210, 15)
Accelerator Cable Clamp EVAP Hose
Clamp Air Intake Chamber
(with Intake Air Control Valve)
Vacuum Hose (from
No.2 Vacuum Pipe)
Vacuum Hose
Gasket
Bracket and Noise Filter
PS Air Hose
Noise Filter
Connector
Engine Wire Clamp Gasket
VSVVacuum Control Valve Set
Engine Wire Clamp
Vacuum Tank
Vacuum Hose
VSV Connector
Oil Dipstick and Guide for A/T O±Ring
28 (280, 21)
Engine Cover
± SFI (2JZ±GE)ACOUSTIC CONTROL INDUCTION SYSTEM (ACIS)
SF±45
1511 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
COMPONENTS
Page 850 of 1111

SF0NV±03
B01629
B01631
(f)
(g)(e)
B09508
B09509
SF±46
± SFI (2JZ±GE)ACOUSTIC CONTROL INDUCTION SYSTEM (ACIS)
1512 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. REMOVE ENGINE COVER
Remove the engine cover and 4 nuts.
2. REMOVE OIL DIPSTICK AND GUIDE FOR A/T
(See page EM±62)
3. REMOVE AIR INTAKE CHAMBER (WITH INTAKE AIR
CONTROL VALVE)
(a) Disconnect the noise filter connector.
(b) Disconnect the engine wire clamp from the bracket.
(c) Remove the bolt, bracket and noise filter.
(d) Remove the 4 bolts and 2 nuts holding the intake air con-
nector to the air intake chamber,
Torque: 28 N´m (280 kgf´cm, 21 ft´lbf)
(e) Disconnect the PS air hose from the air intake chamber.
(f) Disconnect the vacuum hose (from No.2 vacuum pipe)
from the air intake chamber.
(g) Disconnect the vacuum hose (from actuator for ACIS)
from the No.1 vacuum pipe.
(h) Disconnect the accelerator cable, and remove the bolt
and accelerator cable clamp.
(i) Disconnect the EVAP hose, and remove the bolt and
clamp.
(j) Remove the 5 bolts, 2 nuts, air intake chamber and 2 gas-
kets.
Torque: 28 N´m (280 kgf´cm, 21 ft´lbf)
4. REMOVE VACUUM CONTROL VALVE SET
(See page SF±54)
Page 859 of 1111
P02689
Air
E
Filter
P02690
Air
E
F
Battery
± SFI (2JZ±GE)VSV FOR ACOUSTIC CONTROL INDUCTION
SYSTEM (ACIS)SF±55
1521 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(c) Inspect the VSV operation.
(1) Check that air flows from port E to the filter.
(2) Apply battery positive voltage across the terminals.
(3) Check that air flows from ports E to F.
6. REINSTALL VSV
(a) Install the VSV with the screw to the vacuum tank.
(b) Install the vacuum hose.
7. REINSTALL VACUUM CONTROL VALVE SET
Torque: 21 N´m (210 kgf´cm, 15 ft´lbf)
8. REINSTALL OIL DIPSTICK AND GUIDE FOR A/T
HINT:
Using a new O±ring.
9. REINSTALL SEGINE COVER
Reinstall the engine cover with the 4 nuts.
Page 865 of 1111

B01982
LEXUS
Hand±Held
Tester
B01879
Ohmmeter54
B01880
5
4 Battery
± SFI (2JZ±GE)FUEL PUMP
SF±7
1473 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(f) Connect a LEXUS hand±held tester to the DLC3.
(See step 1 in check fuel pump operation (a) to (e))
(g) Measure the fuel pressure.
Fuel pressure:
304 ± 343 kPa (3.1 ± 3.5 kgf/cm
2, 44 ± 50 psi)
If pressure is high, replace the fuel pressure regulator.
If pressure is low, check the fuel hoses and connections, fuel
pump, fuel filter and fuel pressure regulator.
(h) Disconnect the LEXUS hand±held tester from the DLC3.
(i) Start the engine.
(j) Measure the fuel pressure at idle.
Fuel pressure:
304 ± 343 kPa (3.1 ± 3.5 kgf/cm
2, 44 ± 50 psi)
(k) Stop the engine.
(l) Check that the fuel pressure remains as specified for 5
minutes after the engine has stopped.
Fuel pressure: 147 kPa (1.5 kgf/cm
2, 21 psi) or more
If pressure is not as specified, check the fuel pump, pressure
regulator and/or injectors.
(m) After checking fuel pressure, disconnect the negative (±)
terminal cable from the battery and carefully remove SST
to prevent gasoline from splashing.
SST 09268±45014
(n) Reconnect the fuel inlet hose to the fuel pipe support with
2 new gaskets and the union bolt.
Torque: 29 N´m (300 kgf´cm, 21 ft´lbf)
(o) Reconnect the negative (±) terminal cable to the battery.
(p) Check for fuel leaks.
3. INSPECT FUEL PUMP
(a) Remove the rear seat cushion.
(b) Remove the 3 cap nuts and floor service hole cover.
(c) Disconnect the fuel pump & sender gauge connector.
(d) Using an ohmmeter, measure the resistance between ter-
minals 4 and 5.
Resistance: 0.2 ± 3.0 W at 20°C (68°F)
If the resistance is not as specified, replace the fuel pump.
(e) Inspect the fuel pump operation.
Connect the positive (+) lead from the battery to terminal
4 of the connector, and the negative (±) lead to terminal
5. Check that the fuel pump operates.
NOTICE:
These tests must be done quickly (within 10 seconds)
to prevent the coil burning out.
Keep the fuel pump as far away from the battery as
possible.
Always do the switching at the battery side.
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