Lexus SC300 / Lexus SC400. Manual — part 332
5. INSPECT
WATER
TEMPERATURE
SENSOR
Using an ohmmeter, measure the resistance between the ter-
minals.
Resistance: 1.48–1.58 k
at 80
°
C (176
°
F)
If the resistance is not as specified, replace the sensor.
6. REINSTALL
WATER
TEMPERATURE
SENSOR
(a) Install a new O–ring to the water temperature sensor.
(b) Apply soapy water to the O–ring.
(c) Install the water temperature sensor to the radiator.
Torque: 7.4 N
⋅
m (75 kgf
⋅
cm, 65 in.
⋅
lbf)
(d) Connect the water temperature sensor connector.
7.
REFILL WITH ENGINE COOLANT (See page
8.
REINSTALL ENGINE UNDER COVER
9.
RECONNECT CABLE FROM NEGATIVE TERMINAL OF
BATTERY
(A/C High–Pressure Switch)
INSPECTION OF A/C HIGH–PRESSURE
SWITCH
1.
DISCONNECT HIGH–PRESSURE SWITCH CONNECTOR
2.
INSTALL MANIFOLD GAUGE SET (See AC section)
3.
INSPECT HIGH–PRESSURE SWITCH
(a) When the A/C switch is OFF, check that there is
continuity between terminals 2 and 3. (When the
pressure is 1,226 kPa (12.5 kgf/cm
2
, 178 psi) or lower.)
(b) When the A/C switch and blower switch are ON, check
that there is no continuity between terminals 2 and 3.
(When the pressure is 1,520 kPa (15.5 kgf/cm
2
, 220 psi)
or higher.)
If continuity is not as specified, replace the switch.
4.
REMOVE MANIFOLD GAUGE SET
5.
RECONNECT HIGH–PRESSURE SWITCH CONNECTOR
(Solenoid Valve)
(See page
–
COOLIING SYSTEM
Electronically Controlled Hydraulic
Cooling Fan (Electronic Control Parts)
CO–63
SERVICE SPECIFICATIONS
SPECIFICATIONS
VSV (For EVAP)
Resistance
30–34
VSV (For EGR)
Resistance
33–39
TORQUE SPECIFICATIONS
Part tightened
N m
kgf cm
ft
⋅
lbf
VSV for EGR X Intake manifold
18
185
13
EGR valve X Intake manifold
18
185
13
EGR valve X EGR Pipe
64
650
47
Catalytic converter (Front) X Exhaust manifold
62
630
46
Catalytic converter (Front) X Front Exhaust pipe
43
440
32
Front exhaust pipe X Center exhaust pipe
43
440
32
Sub–oxygen sensor X Front exhaust pipe
18
180
13
EC–20
–
EMISSION CONTROL SYSTEMS
Service Specifications
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
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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