intake LEXUS GS400 2000 Service Repair Manual

AT067±01
D01040

Gasket
Clamp
ClampAir Cleaner, MAF Meter and Intake
Air Connector Pipe Assembly
Exhaust Manifold with TWC
Connector and
Wire Harness Level Gauge
Filler PipeAdjusting WasherPropeller Shaft Assembly
Shift Control Rod
Torque Converter ClutchPlug for Line
Pressure TestHeat Insulator
Heated Oxygen Sensor
Front and Center
Exhaust PipeFront Floor
Center Brace
Engine Under Cover Pipe Support BracketO±Ring Heat Insulator

Gasket
Starterx6x839 (400, 29)
44 (450, 33)
72 (730, 53)
37 (380, 27)
13 (130, 9)
79 (805, 58)
37 (375, 27)
7.4 (75, 65 in.´lbf)
44 (450, 33)
44 (450, 33)
37 (380, 27)
37 (380, 27)
Hole Plug
5.4 (55, 48 in.´lbf)
Oil Cooler Pipe
x5

O±Ring
5.4 (55, 48 in.´lbf)

Gasket
44 (450, 33)


5.4 (55, 48 in.´lbf)
N´m (kgf´cm,ft´lbf) : Specified torque

Non±reusable part
Gasket
48 (490, 35)
26 (270, 20)
44 (450, 33)
44 (450, 33)


79 (805, 58)
± AUTOMATIC TRANSMISSIONAUTOMATIC TRANSMISSION UNIT (2JZ±GE)
AT±27
1975 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
AUTOMATIC TRANSMISSION UNIT (2JZ±GE)
COMPONENTS

AT068±01
D01041
D01042
AT±28
± AUTOMATIC TRANSMISSIONAUTOMATIC TRANSMISSION UNIT (2JZ±GE)
1976 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. REMOVE LEVEL GAUGE
2. REMOVE FILLER PIPE
Remove the bolt and filler pipe with the O±ring.
HINT:
At the time of installation, please refer to the following item.
Replace the used O±ring with a new one.
3. REMOVE AIR CLEANER, MAF METER AND INTAKE
AIR CONNECTOR PIPE ASSEMBLY
4. REMOVE EXHAUST MANIFOLD WITH TWC
Remove the 8 nuts, 2 gaskets and exhaust manifold with the
TWC.
Torque: 39 N´m (400 kgf´cm, 29 ft´lbf)
HINT:
At the time of installation, please refer to the following item.
Replace the used gaskets with new ones.
5. RAISE VEHICLE
NOTICE:
Make sure that the vehicle is securely supported.
6. REMOVE ENGINE UNDER COVER
7. REMOVE FRONT AND CENTER EXHAUST PIPE
(a) Disconnect the heated oxygen sensor.
Torque: 44 N´m (450 kgf´cm, 33 ft´lbf)
HINT:
At the time of installation, please refer to the following items.

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

After installing the heated oxygen sensor wire should not
twist. If it is twisted, remove the heated oxygen sensor
and reinstall it.
(b) Remove the 2 bolts and front floor center brace.
Torque: 7.4 N´m (75 kgf´cm, 65 in.´lbf)
(c) Remove the 3 bolts, nuts and 2 gaskets.
Torque: 44 N´m (450 kgf´cm, 33 ft´lbf)
HINT:
At the time of installation, please refer to the following item.
Replace the used nuts and gaskets with new ones.
(d) Remove the 2 bolts and pipe support bracket.
Torque: 44 N´m (450 kgf´cm, 33 ft´lbf)

CO0A8±01
B02029
Air Cleaner Inlet
Upper Radiator Support
Air Cleaner and MAF
Meter Assembly
Lower Radiator Support
Intake Air Resonator
Engine Under Cover
x 18
ECT Switch
Connector for
Electric Cooling
Fan Lower Radiator Hose
Upper Radiator Support
Upper Radiator Hose
ECM Outlet Duct
Wire Clamp
Electric Cooling
Fan Connector
Oil Cooler Hose
for A/T Engine Wire
Clamp MAF Meter Connector
Radiator and Electric
Cooling Fan Assembly
EVAP Hose
CO±16
± COOLING (2JZ±GE)RADIATOR
1554 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
COMPONENTS

CO0AE±01
B02030
Electric Cooling
Fan Connector Upper Radiator Hose Air Cleaner Inlet
MAF Meter Connector Air Cleaner and MAF Meter Assembly
Intake Air ResonatorElectric Cooling Fan Assembly
Radiator Reservoir Hose
Wire Clamp ECM Outlet Duct
x 6
EVAP Hose
Engine
Wire Clamp
± COOLING (2JZ±GE)ELECTRIC COOLING FAN
CO±25
1563 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
COMPONENTS

CO09Y±01
A02724
Air Cleaner Inlet
Upper Radiator Support
MAF Meter Connector Air Cleaner and MAF
Meter AssemblyLower Radiator Hose
Radiator
Assembly
ECM Outlet Duct
ECT
Switch
Engine Wire Clamp EVAP Hose
Lower Radiator Support
Intake Air Resonator
PS Pump
Front Bracket
Water Pump Pulley
Drive Belt
Engine Under CoverPS Vane Pump
Oil Cooler Hose
for A/T Electric Cooling
Fan Connector
Upper Radiator
Hose
x 18
58 (590, 43)
52 (530, 38)
N´m (kgf´cm, ft´lbf)
 Non±reusable part: Specified torqueWire Clamp
Upper Radiator
Support
± COOLING (2JZ±GE)WATER PUMP
CO±3
1541 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
WATER PUMP
COMPONENTS

EC0DF±01
B01589
Air Cleaner, MAF Meter
and Intake Air Resonator
AssemblyPCV Hose
PS Air Hose
Air Cleaner Inlet MAF Meter Connector
Heated Oxygen Sensor
(Bank 1 Sensor 1)EVAP Hose

Gasket
Exhaust Manifold (with Front TWC)
Pipe Support Bracket
N´m (kgf´cm, ft´lbf)

Non±reusable partWire Grommet
Front Exhaust Pipe
: Specified torque
Heated Oxygen Sensor
(Bank 2 Sensor 1)
Heated Oxygen Sensor
(Bank 1 Sensor 2)

Gasket
40 (408, 30)
x 8
45 (450, 32)
44 (440, 32)
Engine Wire Clamp
Case Clamp

Clamp
44 (440, 32)
EC±12± EMISSION CONTROL (2JZ±GE)THREE±WAY CATALYTIC CONVERTER (TWC)
SYSTEM
1463 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
THREE±WAY CATALYTIC CONVERTER (TWC) SYSTEM
COMPONENTS

EC050±04
B09011
± EMISSION CONTROL (2JZ±GE)THREE±WAY CATALYTIC CONVERTER (TWC)
SYSTEMEC±15
1466 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REPLACEMENT
1. REMOVE ENGINE COVER
2. REMOVE AIR CLEANER INLET
3. REMOVE AIR CLEANER, MAF METER AND INTAKE
AIR RESONATOR ASSEMBLY (See page EM±62)
4. DISCONNECT HEATED OXYGEN SENSORS FROM
EXHAUST MANIFOLD
(a) Disconnect the 3 oxygen sensor connectors.
(b) Disconnect the 2 oxygen sensors (bank 1 sensor 1, 2)
from the exhaust manifold.
5. REMOVE FRONT EXHAUST PIPE (WITH REAR TWC)
(a) Take out the front side of the floor carpet.
(b) Disconnect the oxygen sensor connector.
(c) Remove the 2 bolts and pipe support bracket.
(d) Remove the 5 bolts, front exhaust pipe and 3 gaskets.
6. REMOVE EXHAUST MANIFOLD (WITH FRONT TWC)
(a) Using a 14 mm deep socket wrench, remove the 8 nuts,
the exhaust manifold and 2 gaskets.
(b) Remove the heated oxygen sensor (bank 2 sensor 1)
form the exhaust manifold.
7. REINSTALL NEX EXHAUST MANIFOLD (WITH FRONT
TWC)
(a) Install the heated oxygen sensor (bank 2 sensor 1) to the
exhaust manifold.
Torque: 45 N´m (450 kgf´cm, 33 ft´lbf)
(b) Install 2 new gaskets to the cylinder head.
(c) Using a 14 mm deep socket wrench, install new exhaust
manifold with 8 new nuts. Uniformly tighten the nuts in
several passes.
Torque: 40 N´m (408 kgf´cm, 30 ft´lbf)
8. REINSTALL FRONT EXHAUST PIPE (WITH REAR
TWC)
(a) Reinstall new 3 gaskets, and front exhaust pipe with 5
bolts and support bracket.
(b) Reinstall the pipe support bracket with 2 bolts.
9. RECONNECT HEATED OXYGEN SENSORS TO EX-
HAUST MANIFOLD
(a) Install the 2 oxygen sensors (bank 1 sensor 1, 2) to the
exhaust manifold.
Torque: 45 N´m (450 kgf´cm, 33 ft´lbf)
(b) Connect the 3 oxygen sensor connectors.
10. REINSTALL AIR CLEANER, MAF MATER AND INTAKE
AIR RESONATOR ASSEMBLY (See page EM±68)
11. REINSTALL AIR CLEANER INLET
12. REINSTALL ENGINE COVER

EC04X±05
B02023
PCV Valve
P02006Cylinder Head SideClean Hose
P02477
Intake Air
Connector Side
B02817
Side
Line
55° EC±4
± EMISSION CONTROL (2JZ±GE)POSITIVE CRANKCASE VENTILATION (PCV)
SYSTEM
1455 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
POSITIVE CRANKCASE
VENTILATION (PCV) SYSTEM
INSPECTION
1. REMOVE ENGINE COVER
Remove 4 nuts and engine cover.
2. REMOVE PCV VALVE
(a) Disconnect the PCV hose from the PCV valve.
(b) Remove the PCV valve.
3. INSTALL CLEAN HOSE TO PCV VALVE
4. INSPECT PCV VALVE OPERATION
(a) Blow air into the cylinder head side, and check that air
passes through easily.
CAUTION:

Do not suck air through the valve.

Petroleum substances inside the valve are harmful.
(b) Blow air into the intake air connector side, and check that
air passes through with difficulty.
If operation is not as specified, replace the PCV valve.
5. REMOVE CLEAN HOSE FROM PCV VALVE
6. REINSTALL PCV VALVE
The port faces in the direction indicated in the illustration.

EM±2
± ENGINE MECHANICAL (2JZ±GE)CO/HC
1356 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
If the CO/HC concentration does not comply with regulations,
troubleshoot in the order given below.
(a) Check heated oxygen sensors operation.
(See page DI±44)
(b) See the table below for possible causes, and then inspect
and correct the applicable causes if necessary.
HCCOPhenomenonCauses
HighNormalRough idle1. Faulty ignitions:

Incorrect timing

Fouled, shorted or improperly gapped plugs

Open or crossed high±tension cords
2. Incorrect valve clearance
3. Leaky intake and exhaust valves
4. Leaky cylinder
HighLowRough idle
(Fluctuating HC reading)1. Vacuum leaks:

PCV hose

Intake manifold

Throttle body

Cylinder head gasket
2. Lean mixture causing misfire
HighHighRough idle
(Black smoke from exhaust)1. Restricted air filter
2. Plugged PCV valve
3. Faulty SFI systems:

Faulty pressure regulator

Faulty ECM

Faulty injector

Faulty throttle position sensor

Faulty mass air flow meter

EM0D5±03
A09758
Air Cleaner Inlet
Air Cleaner, MAF Meter and Intake
Air Resonator Assembly
PCV Hose
MAF Meter
Connector
PS Air Hose
Engine Wire
Clamp
EVAP HoseRadiator Assembly
Lower Radiator Hose
Upper Radiator Support
ECM
Outlet Duct
Wire Clamp
ECT Switch
Connector
Electric
Cooling Fan
Connector
Oil Cooler Hose
for A/T Accelerator Cable
PS Vane Pump
PS Pump
Front Bracket
Drive Belt
Engine Under Cover
N´m (kgf´cm, ft´lbf) : Specified torque
 Non±reusable Part
Lower Radiator
Support
Upper Radiator Hose
58 (590, 43)
52 (530, 38)
x 18
Engine Cover EM±14
± ENGINE MECHANICAL (2JZ±GE)TIMING BELT
1368 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
TIMING BELT
COMPONENTS