Lexus GS300/400 (2000 year). Service manual — part 126
EC04Z–01
EC–14
–
EMISSION CONTROL (2JZ–GE)
THREE–WAY CATALYTIC CONVERTER (TWC)
SYSTEM
1465
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)
SYSTEM
EC–15
1466
REPLACEMENT
1.
REMOVE ENGINE COVER
2.
REMOVE AIR CLEANER INLET
3.
REMOVE AIR CLEANER, MAF METER AND INTAKE
AIR RESONATOR ASSEMBLY (See page
)
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
)
11.
REINSTALL AIR CLEANER INLET
12.
REINSTALL ENGINE COVER
EC04V–06
B08612
PCV Valve
VSV for EVAP
Front TWC
EVAP Service Port
Fill Check Line
Cutoff Valve
Charcoal 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
PARTS LAYOUT AND SCHEMATIC DRAWING
LOCATION
EC04W–06
B08613
VSV for Vapor Pressure Sensor
Purge Line
Air Inlet Line
Air Drain Hose
EVAP Line
Fuel Tank
Charcoal Canister
VSV for EVAP
Vapor 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
DRAWING
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