Lexus SC300 / Lexus SC400. Service manual — part 719
![](/vehicle/tus/kendre/chaul/ennothel.png)
(b) Install the EGR valve with the two nuts.
Torque: 18 N
⋅
m (185 kgf
⋅
cm, 13 ft
⋅
lbf)
(c) Connect the following hoses:
(1) Water by–pass hose (from ISC valve) to the EGR
valve
(2) Water by–pass hose (from rear water by–pass
joint) to the EGR valve
8.
RECONNECT EGR VALVE CONNECTOR
9. RECONNECT CABLE TO NEGATIVE TERMINAL OF
BATTERY
10. REFILL WITH ENGINE COOLANT (See page
INSPECTION OF EGR VALVE
(Exc. USA Spec.)
1.
DRAIN ENGINE COOLANT (See page
2.
REMOVE EGR VALVE
(a) Disconnect the following hoses:
(1) Vacuum hose (from VSV) from EGR valve
(2) Vacuum hose (from VSV) from EGR vacuum
modulator
(3) Vacuum hose (from EGR vacuum modulator) f
rom EGR valve
(4) Water by–pass hose (from ISC valve) from the
EGR valve
(5) Water by–pass hose (from rear water by–pass
joint) from the EGR valve
(b) Disconnect the vacuum modulator bracket from the
EGR valve.
(c) Remove the two nuts, EGR valve and gasket.
EC–24
–
EMISSION CONTROL SYSTEMS
Exhaust Gas Recirculation (EGR) System
![](/vehicle/tus/kendre/chaul/esidbucz.png)
3.
INSPECT EGR VALVE
Check for sticking and heavy carbon deposits.
If a problem is found, replace the EGR valve assembly.
4.
REINSTALL EGR VALVE
(a) Place a new gasket on the EGR valve adaptor.
NOTICE:
•
Do not touch the adaptor and EGR valve surfaces of the
gasket with your hand.
•
Align the port holes of the gasket and adaptor.
Be careful of the installation direction.
(b) Install the EGR valve with the two nuts.
Torque: 18 N
⋅
m (185 kgf
⋅
cm, 13 ft
⋅
lbf)
(c) Install the vacuum modulator bracket to the EGR valve.
(d) Connect the following hoses:
(1) Vacuum hose (from VSV) to EGR valve
(2) Vacuum hose (from VSV) to EGR vacuum modula-
tor
(3) Vacuum hose (from EGR vacuum modulator) to
EGR valve
(4) Water by–pass hose (from ISC valve) to the EGR
valve
(5) Water by–pass hose (from rear water by–pass
joint) to the EGR valve
5.
REFILL WITH ENGINE COOLANT (See page
–
EMISSION CONTROL SYSTEMS
Exhaust Gas Recirculation (EGR) System
EC–25
![](/vehicle/tus/kendre/chaul/win.png)
THREE–WAY CATALYST (TWC) SYSTEM
DESCRIPTION
To reduce HC, CO and NOx emissions, they are oxidized, reduced and converted to nitrogen (N2), carbon
dioxide (CO2) and water (H2O) by the catalyst.
OPERATION
EC–26
–
EMISSION CONTROL SYSTEMS
Three–Way Catalyst (TWC) System
![](/vehicle/tus/kendre/chaul/wng.png)
INSPECTION OF EXHAUST PIPE
ASSEMBLY
1.
CHECK CONNECTIONS FOR LOOSENESS OR DAMAGE
2. CHECK
CLAMPS
FOR
WEAKNESS,
CRACKS OR
DAMAGE
INSPECTION OF CATALYTIC
CONVERTERS
CHECK FOR DENTS OR DAMAGE
If any part of protector is damaged or dented to the extent that
it contacts the converter, repair or replace it.
INSPECTION OF HEAT INSULATORS
1.
CHECK HEAT INSULATOR FOR DAMAGE
2. CHECK
FOR
ADEQUATE
CLEARANCE
BETWEEN
CATALYTIC CONVERTER AND HEAT INSULATOR
COMPONENTS FOR REPLACEMENT OF CATALYTIC CONVERTERS
–
EMISSION CONTROL SYSTEMS
Three–Way Catalyst (TWC) System
EC–27
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