2000 LEXUS GS400 Service Repair Manual

± COOLING (2JZ±GE)WATER PUMP
CO±9
1547 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
6. INSTALL RADIATOR ASSEMBLY
(See page CO±23)

EC00B±05
± EMISSION CONTROL (2JZ±GE)EMISSION CONTROL SYSTEM
EC±1
1452 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
EMISSION CONTROL SYSTEM
PURPOSE
The emission control systems are installed to reduce the amount of CO, HC and NOx exhausted from the
engine (3) and (4)), to prevent the atmospheric release of blow±by gas±containing HC (1) and evaporated
fuel containing HC being released from the fuel tank (2).
The function of each system is shown in these table.
SystemAbbreviationFunction
(1) Positive Crankcase Ventilation
(2) Evaporative Emission Control
(3) Three±Way Catalytic Converter
(4) Sequential Multiport Fuel Injection *PCV
EVAP
TWC
SFIReduces blow±by gas (HC)
Reduces evaporated HC
Reduces CO, HC and NOx
Injects a precisely timed, optimum amount of fuel for reduced exhaust
emissions
Remark: * For inspection and repair of the SFI system, refer to the SF section this manual.

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

B08609
N´m (kgf´cm, ft´lbf) : Specified torque

Non±reusable part
44 (440, 32)
Gasket


Gasket

Front Exhaust Pipe
(with Rear TWC)
44 (440, 32)
44 (440, 32)
Pipe Support Bracket Floor Carpet Under CoverHeated Oxygen
Sensor Connector
TWC
± EMISSION CONTROL (2JZ±GE)THREE±WAY CATALYTIC CONVERTER (TWC)
SYSTEMEC±13
1464 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

EC04Z±01
EC±14± EMISSION CONTROL (2JZ±GE)THREE±WAY CATALYTIC CONVERTER (TWC)
SYSTEM
1465 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. CHECK CONNECTIONS FOR LOOSENESS OR DAMAGE
2. CHECK CLAMPS FOR WEAKNESS, CRACKS OR DAMAGE
3. CHECK FOR DENTS OR DAMAGE
If any part of the protector is damaged or dented to the extent that it contacts the three±way catalytic convert-
er, repair or replace it.
4. CHECK HEAT INSULATOR FOR DAMAGE
5. CHECK FOR ADEQUATE CLEARANCE BETWEEN CATALYTIC CONVERTER AND HEAT INSU-
LATOR

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

EC04V±06
B08612
PCV Valve VSV for EVAP
Front TWC
EVAP Service Port
Fill Check LineCutoff ValveCharcoal Canister
Air Inlet Line
Vapor Pressure Sensor
Fuel Tank Cap
VSV for Vapor
Pressure Sensor
Purge Line
EVAP Line
Vent Line
Air Drain Hose
Rear TWC
EC±2
± EMISSION CONTROL (2JZ±GE)PARTS LAYOUT AND SCHEMATIC DRAWING
1453 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
PARTS LAYOUT AND SCHEMATIC DRAWING
LOCATION

EC04W±06
B08613
VSV for Vapor Pressure Sensor
Purge Line
Air Inlet LineAir Drain Hose
EVAP Line
Fuel Tank Charcoal Canister VSV for EVAPVapor Pressure Sensor
PCV Valve
Front TWC Front TWC
Vent Line
Fuel Tank
Cap
EVAP
Service
Port
Rear TWC
± EMISSION CONTROL (2JZ±GE)PARTS LAYOUT AND SCHEMATIC DRAWING
EC±3
1454 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
DRAWING